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#Region "Microsoft.VisualBasic::f4c2b31d45c923624a03b61ae047e2e7, Microsoft.VisualBasic.Core\Extensions\Collection\KeyValuePair.vb"
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#End Region
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Imports System.Collections.Specialized
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Imports System.Runtime.CompilerServices
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Imports Microsoft.VisualBasic.CommandLine.Reflection
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Imports Microsoft.VisualBasic.ComponentModel
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Imports Microsoft.VisualBasic.ComponentModel.Collection
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Imports Microsoft.VisualBasic.ComponentModel.Collection.Generic
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Imports Microsoft.VisualBasic.ComponentModel.DataSourceModel
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Imports Microsoft.VisualBasic.Language
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Imports Microsoft.VisualBasic.Linq
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Imports Microsoft.VisualBasic.Serialization.JSON
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Imports Microsoft.VisualBasic.Text
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Imports Microsoft.VisualBasic.Text.Xml.Models
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Imports r = System.Text.RegularExpressions.Regex
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Public Module KeyValuePairExtensions
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<Extension>
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Public Iterator Function AsEnumerable(keys As NameObjectCollectionBase.KeysCollection) As IEnumerable(Of String)
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If Not keys Is Nothing AndAlso keys.Count > 0 Then
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For i As Integer = 0 To keys.Count - 1
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Yield keys.Item(i)
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Next
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End If
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End Function
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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<Extension>
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Public Function Tuple(Of T1, T2)(a As T1, b As T2) As (T1, T2)
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Return (a, b)
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End Function
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<Extension>
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Public Function Tsv(table As Dictionary(Of String, String),
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saveTo$,
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Optional encoding As Encodings = Encodings.UTF8,
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Optional reversed As Boolean = False) As Boolean
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Dim file$() = $"key{ASCII.TAB}map" +
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table _
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.Select(Function(map)
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If reversed Then
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Return $"{map.Value}{ASCII.TAB}{map.Key}"
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Else
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Return $"{map.Key}{ASCII.TAB}{map.Value}"
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End If
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End Function) _
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.AsList
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Return file.SaveTo(saveTo, encoding.CodePage)
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End Function
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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<Extension>
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Public Function AsTable(Of K, V)(tuples As IEnumerable(Of (K, V))) As Dictionary(Of K, V)
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Return tuples.ToDictionary(Function(t) t.Item1, Function(t) t.Item2)
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End Function
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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<Extension>
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Public Function KeyItem(Of T As INamedValue)(source As IEnumerable(Of T), key$) As T
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Return source _
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.Where(Function(i) i.Key = key) _
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.FirstOrDefault
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End Function
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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<Extension>
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Public Function [Select](Of T As INamedValue)(source As IEnumerable(Of T), pattern$) As IEnumerable(Of T)
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Return source.Where(Function(i) r.Match(i.Key, pattern, RegexICSng).Success)
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End Function
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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<Extension>
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Public Function IsOneOfA(Of T)(item As T, define As Index(Of T)) As Boolean
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Return define.IndexOf(item) > -1
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End Function
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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<Extension>
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Public Function Subset(Of T)(table As Dictionary(Of String, T), keys$()) As Dictionary(Of String, T)
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Return keys _
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.Select(Function(key)
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Return (key:=key, Value:=table(key))
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End Function) _
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.ToDictionary(Function(o) o.key,
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Function(o) o.Value)
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End Function
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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<Extension>
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Public Function Subset(Of K, V)(table As Dictionary(Of K, V), assert As Func(Of K, V, Boolean)) As Dictionary(Of K, V)
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Return table _
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.Where(Function(map) assert(map.Key, map.Value)) _
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.ToDictionary(Function(map) map.Key,
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Function(map) map.Value)
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End Function
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按照给定的键名列表<paramref name="keys"/>将字典之中的对应的元素按照键名的顺序取出来
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<param name="keys"></param>
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<param name="nonExitsNULL">
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如果这个参数为真,则对于不存在的键名,则使用
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</param>
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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<Extension>
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Public Function Takes(Of T)(table As IDictionary(Of String, T), keys As IEnumerable(Of String), Optional nonExitsNULL As Boolean = True) As T()
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If nonExitsNULL Then
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Return keys _
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.Select(Function(key)
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Return If(table.ContainsKey(key), table(key), Nothing)
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End Function) _
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.ToArray
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Else
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Return keys _
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.Select(Function(key) table(key)) _
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.ToArray
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End If
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End Function
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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<Extension>
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Public Function XMLModel(data As IEnumerable(Of NamedValue(Of String))) As NamedValue()
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Return data _
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.Select(Function(n) New NamedValue With {.name = n.Name, .text = n.Value}) _
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.ToArray
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End Function
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<Extension>
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Public Iterator Function EnumerateTuples(Of T)(table As Dictionary(Of String, T)) As IEnumerable(Of (name As String, obj As T))
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For Each entry In table
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Yield (entry.Key, entry.Value)
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Next
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End Function
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<Extension>
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Public Iterator Function EnumerateTuples(Of K, V)(table As IEnumerable(Of KeyValuePair(Of K, V))) As IEnumerable(Of (tag As K, obj As V))
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For Each entry In table
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Yield (entry.Key, entry.Value)
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Next
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End Function
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<Extension> Public Function AsNamedVector(Of T)(groups As IEnumerable(Of IGrouping(Of String, T))) As IEnumerable(Of NamedCollection(Of T))
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Return groups.Select(Function(group)
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Return New NamedCollection(Of T) With {
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.Name = group.Key,
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.Value = group.ToArray
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}
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End Function)
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End Function
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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<Extension>
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Public Function AsNamedValueTuples(Of T)(tuples As IEnumerable(Of KeyValuePair(Of String, T))) As IEnumerable(Of NamedValue(Of T))
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Return tuples.Select(Function(p) New NamedValue(Of T)(p.Key, p.Value))
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End Function
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<Extension>
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Public Function AsGroups(Of T)(table As Dictionary(Of String, T())) As IEnumerable(Of NamedCollection(Of T))
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Return table.Select(Function(item)
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Return New NamedCollection(Of T) With {
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.Name = item.Key,
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.Value = item.Value
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}
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End Function)
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End Function
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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<Extension>
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Public Function IGrouping(Of T)(source As IEnumerable(Of NamedCollection(Of T))) As IEnumerable(Of IGrouping(Of String, T))
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Return source.Select(Function(x) DirectCast(x, IGrouping(Of String, T)))
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End Function
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Removes the target key in the dictionary table, and then gets the removed value.
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(删除字典之中的指定的键值对,然后返回被删除的数据值)
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<param name="key"></param>
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<returns>The value of the removed <paramref name="key"/></returns>
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<Extension>
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Public Function RemoveAndGet(Of K, V)(table As Dictionary(Of K, V), key As K) As V
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Dim item As V = table(key)
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Call table.Remove(key)
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Return item
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End Function
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Iterates all of the values in the <paramref name="source"/> collection data.
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<Extension>
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Public Function IteratesAll(Of T As INamedValue)(source As IEnumerable(Of NamedCollection(Of T))) As T()
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Return source.Select(Function(c) c.Value).IteratesALL.ToArray
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End Function
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Groups source by <see cref="INamedValue.Key"/>
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<Extension>
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Public Function GroupByKey(Of T As INamedValue)(source As IEnumerable(Of T)) As NamedCollection(Of T)()
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Return source _
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.GroupBy(Function(o) o.Key) _
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.Select(Function(g)
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Return New NamedCollection(Of T) With {
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.Name = g.Key,
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.Value = g.ToArray
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}
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End Function) _
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.ToArray
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End Function
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Retrieve all items
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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<Extension>
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Public Function Values(Of T)(source As IEnumerable(Of NamedValue(Of T))) As T()
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Return source _
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.Select(Function(x) x.Value) _
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.ToArray
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End Function
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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<Extension>
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Public Function Values(Of T, V)(src As IEnumerable(Of KeyValuePair(Of T, V))) As V()
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Return src.SafeQuery.Select(Function(x) x.Value).ToArray
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End Function
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gets all <see cref="INamedValue.Key"/> values
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<param name="distinct"></param>
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<Extension>
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Public Function Keys(Of T As INamedValue)(source As IEnumerable(Of T), Optional distinct As Boolean = False) As List(Of String)
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Dim list As IEnumerable(Of String) = source.Select(Function(o) o.Key)
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If distinct Then
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list = list.Distinct
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End If
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Return list.AsList
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End Function
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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<Extension>
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Public Function Keys(Of K, V)(source As IEnumerable(Of IGrouping(Of K, V))) As K()
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Return source _
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.Select(Function(x) x.Key) _
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.ToArray
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End Function
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#If FRAMEWORD_CORE Then
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Get a specific item value from the target collction data using its UniqueID property,
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(请注意,请尽量不要使用本方法,因为这个方法的效率有些低,对于获取<see cref="INamedValue">
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</see>类型的集合之中的某一个对象,请尽量先转换为字典对象,在使用该字典对象进行查找以提高代码效率,使用本方法的优点是可以选择忽略<paramref name="uid">
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</paramref>参数之中的大小写,以及对集合之中的存在相同的Key的这种情况的容忍)
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<param name="uid"></param>
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<param name="IgnoreCase"></param>
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<remarks></remarks>
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<ExportAPI("Get.Item")>
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<Extension> Public Function GetByKey(Of T As INamedValue)(
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source As IEnumerable(Of T),
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uid As String,
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Optional ignoreCase As StringComparison = StringComparison.Ordinal) _
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As T
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Dim find As T = LinqAPI.DefaultFirst(Of T) _
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_
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() <= From x As T
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In source
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Where String.Equals(uid, x.Key, ignoreCase)
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Select x
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Return find
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End Function
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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<Extension> Public Function GetByKey(Of T As INamedValue)(
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source As IEnumerable(Of T),
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uid As String,
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Optional ignoreCase As Boolean = False) _
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As T
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Return source.GetByKey(uid, If(ignoreCase, StringComparison.OrdinalIgnoreCase, StringComparison.Ordinal))
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End Function
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#End If
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Dictionary object contains the specific <see cref="NamedValue(Of T).Name"/>?
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<param name="k"></param>
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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<Extension>
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Public Function ContainsKey(Of T As INamedValue)(table As Dictionary(Of T), k As NamedValue(Of T)) As Boolean
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Return table.ContainsKey(k.Name)
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End Function
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Dictionary object contains the specific <see cref="NamedValue(Of T).Name"/>?
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<param name="k"></param>
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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<Extension>
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Public Function ContainsKey(Of T)(table As Dictionary(Of String, T), k As NamedValue(Of T)) As Boolean
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Return table.ContainsKey(k.Name)
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End Function
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Converts the interface object into a Dictionary object.
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| 443 |
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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| 448 |
<Extension>
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| 449 |
Public Function DictionaryData(Of T, V)(source As IReadOnlyDictionary(Of T, V)) As Dictionary(Of T, V)
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Return source.ToDictionary(Function(x) x.Key, Function(x) x.Value)
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End Function
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| 452 |
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Creates the dictionary for string converts to enum value.
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(接受的泛型类型必须是枚举类型)
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<param name="lcaseKey"></param>
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<param name="usingDescription"></param>
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| 460 |
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Public Function EnumParser(Of T As Structure)(Optional lcaseKey As Boolean = True, Optional usingDescription As Boolean = False) As Dictionary(Of String, T)
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Dim values As [Enum]() = Enums(Of T)().Select(Function(e) DirectCast(CType(e, Object), [Enum])).ToArray
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Dim [case] = If(lcaseKey, Function(key$) LCase(key), Function(key$) key)
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| 464 |
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If usingDescription Then
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Return values.ToDictionary(
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Function(e) [case](key:=e.Description),
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Function(e) DirectCast(CType(e, Object), T))
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Else
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Return values.ToDictionary(
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Function(e) [case](key:=e.ToString),
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Function(e) DirectCast(CType(e, Object), T))
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End If
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| 474 |
End Function
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| 475 |
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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<Extension>
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| 478 |
Public Function NamedValues(maps As IEnumerable(Of IDMap)) As NamedValue(Of String)()
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| 479 |
Return maps _
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.Select(Function(m) New NamedValue(Of String)(m.Key, m.Maps)) _
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.ToArray
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End Function
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| 483 |
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Convert the dictionary table as the <see cref="NamedValue(Of T)"/> collection.
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(将目标字典之中的键值对转换为被命名为的变量值)
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| 490 |
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| 491 |
<MethodImpl(MethodImplOptions.AggressiveInlining)>
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<Extension>
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Public Function NamedValues(Of T)(table As Dictionary(Of String, T)) As NamedValue(Of T)()
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Return table _
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.Select(Function(k)
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Return New NamedValue(Of T) With {
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.Name = k.Key,
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.Value = k.Value
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| 499 |
}
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| 500 |
End Function) _
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.ToArray
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End Function
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| 503 |
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<Extension>
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| 505 |
Public Iterator Function IterateNameValues(Of T)(table As Dictionary(Of String, T)) As IEnumerable(Of NamedValue(Of T))
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| 506 |
For Each map As KeyValuePair(Of String, T) In table
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| 507 |
Yield New NamedValue(Of T) With {
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| 508 |
.Name = map.Key,
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| 509 |
.Value = map.Value
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| 510 |
}
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| 511 |
Next
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| 512 |
End Function
|
| 513 |
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| 514 |
<Extension>
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| 515 |
Public Iterator Function IterateNameCollections(Of T)(table As Dictionary(Of String, T())) As IEnumerable(Of NamedCollection(Of T))
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| 516 |
For Each map As KeyValuePair(Of String, T()) In table
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| 517 |
Yield New NamedCollection(Of T)(map.Key, map.Value)
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| 518 |
Next
|
| 519 |
End Function
|
| 520 |
|
| 521 |
<Extension>
|
| 522 |
Public Function NameValueCollection(maps As IEnumerable(Of IDMap)) As NameValueCollection
|
| 523 |
Dim nc As New NameValueCollection
|
| 524 |
|
| 525 |
For Each m As IDMap In maps
|
| 526 |
Call nc.Add(m.Key, m.Maps)
|
| 527 |
Next
|
| 528 |
|
| 529 |
Return nc
|
| 530 |
End Function
|
| 531 |
|
| 532 |
<Extension>
|
| 533 |
Public Function NameValueCollection(maps As IEnumerable(Of KeyValuePair(Of String, String))) As NameValueCollection
|
| 534 |
Dim nv As New NameValueCollection
|
| 535 |
|
| 536 |
For Each tuple As KeyValuePair(Of String, String) In maps
|
| 537 |
Call nv.Add(tuple.Key, tuple.Value)
|
| 538 |
Next
|
| 539 |
|
| 540 |
Return nv
|
| 541 |
End Function
|
| 542 |
|
| 543 |
|
| 544 |
获取得到的集合对象是一个安全的集合对象,不存在的键名会直接返回空值
|
| 545 |
|
| 546 |
<param name="maps"></param>
|
| 547 |
|
| 548 |
<Extension>
|
| 549 |
Public Function NameValueCollection(maps As IEnumerable(Of NamedValue(Of String))) As NameValueCollection
|
| 550 |
Dim nc As New NameValueCollection
|
| 551 |
|
| 552 |
For Each m As NamedValue(Of String) In maps
|
| 553 |
Call nc.Add(m.Name, m.Value)
|
| 554 |
Next
|
| 555 |
|
| 556 |
Return nc
|
| 557 |
End Function
|
| 558 |
|
| 559 |
<Extension> Public Sub SortByValue(Of V, T)(ByRef table As Dictionary(Of V, T), Optional desc As Boolean = False)
|
| 560 |
Dim orders As KeyValuePair(Of V, T)()
|
| 561 |
Dim out As New Dictionary(Of V, T)
|
| 562 |
|
| 563 |
If Not desc Then
|
| 564 |
orders = table.OrderBy(Function(p) p.Value).ToArray
|
| 565 |
Else
|
| 566 |
orders = table _
|
| 567 |
.OrderByDescending(Function(p) p.Value) _
|
| 568 |
.ToArray
|
| 569 |
End If
|
| 570 |
|
| 571 |
For Each k As KeyValuePair(Of V, T) In orders
|
| 572 |
Call out.Add(k.Key, k.Value)
|
| 573 |
Next
|
| 574 |
|
| 575 |
table = out
|
| 576 |
End Sub
|
| 577 |
|
| 578 |
|
| 579 |
按照键名对字典进行重新排序
|
| 580 |
|
| 581 |
|
| 582 |
|
| 583 |
|
| 584 |
<param name="desc">默认为从小到大的升序排序</param>
|
| 585 |
<Extension> Public Sub SortByKey(Of V, T)(ByRef table As Dictionary(Of V, T), Optional desc As Boolean = False)
|
| 586 |
Dim orders As V()
|
| 587 |
Dim out As New Dictionary(Of V, T)
|
| 588 |
|
| 589 |
If Not desc Then
|
| 590 |
orders = table.Keys.OrderBy(Function(k) k).ToArray
|
| 591 |
Else
|
| 592 |
orders = table.Keys _
|
| 593 |
.OrderByDescending(Function(k) k) _
|
| 594 |
.ToArray
|
| 595 |
End If
|
| 596 |
|
| 597 |
For Each k As V In orders
|
| 598 |
Call out.Add(k, table(k))
|
| 599 |
Next
|
| 600 |
|
| 601 |
table = out
|
| 602 |
End Sub
|
| 603 |
|
| 604 |
|
| 605 |
Determines whether the <see cref="NameValueCollection"/> contains the specified key.
|
| 606 |
|
| 607 |
<param name="d"></param>
|
| 608 |
<param name="key$">The key to locate in the <see cref="NameValueCollection"/></param>
|
| 609 |
<returns>true if the System.Collections.Generic.Dictionary`2 contains an element with
|
| 610 |
the specified key; otherwise, false.</returns>
|
| 611 |
|
| 612 |
<MethodImpl(MethodImplOptions.AggressiveInlining)>
|
| 613 |
<Extension>
|
| 614 |
Public Function ContainsKey(d As NameValueCollection, key$) As Boolean
|
| 615 |
Return Not String.IsNullOrEmpty(d(key))
|
| 616 |
End Function
|
| 617 |
|
| 618 |
<Extension>
|
| 619 |
Public Function Join(Of T, V)(d As Dictionary(Of T, V), name As T, value As V) As Dictionary(Of T, V)
|
| 620 |
d(name) = value
|
| 621 |
Return d
|
| 622 |
End Function
|
| 623 |
|
| 624 |
|
| 625 |
请注意,这里的类型约束只允许枚举类型
|
| 626 |
|
| 627 |
|
| 628 |
|
| 629 |
|
| 630 |
<MethodImpl(MethodImplOptions.AggressiveInlining)>
|
| 631 |
Public Function ParserDictionary(Of T As Structure)() As Dictionary(Of String, T)
|
| 632 |
Return Enums(Of T).ToDictionary(Function(x) DirectCast(CType(x, Object), [Enum]).Description)
|
| 633 |
End Function
|
| 634 |
|
| 635 |
|
| 636 |
Data exists and not nothing
|
| 637 |
|
| 638 |
|
| 639 |
<param name="d"></param>
|
| 640 |
<param name="key"></param>
|
| 641 |
|
| 642 |
|
| 643 |
<MethodImpl(MethodImplOptions.AggressiveInlining)>
|
| 644 |
<Extension>
|
| 645 |
Public Function HaveData(Of T)(d As Dictionary(Of T, String), key As T) As Boolean
|
| 646 |
Return d.ContainsKey(key) AndAlso Not String.IsNullOrEmpty(d(key))
|
| 647 |
End Function
|
| 648 |
|
| 649 |
<Extension>
|
| 650 |
Public Function ToDictionary(nc As NameValueCollection) As Dictionary(Of String, String)
|
| 651 |
Dim hash As New Dictionary(Of String, String)
|
| 652 |
|
| 653 |
For Each key As String In nc.AllKeys
|
| 654 |
hash(key) = nc(key)
|
| 655 |
Next
|
| 656 |
|
| 657 |
Return hash
|
| 658 |
End Function
|
| 659 |
|
| 660 |
<MethodImpl(MethodImplOptions.AggressiveInlining)>
|
| 661 |
<Extension>
|
| 662 |
Public Function ToDictionary(Of K, V, KOut, VOut)(input As IEnumerable(Of KeyValuePair(Of K, V)), key As Func(Of K, V, KOut), value As Func(Of K, V, VOut)) As Dictionary(Of KOut, VOut)
|
| 663 |
Return input.ToDictionary(Function(tuple) key(tuple.Key, tuple.Value),
|
| 664 |
Function(tuple) value(tuple.Key, tuple.Value))
|
| 665 |
End Function
|
| 666 |
|
| 667 |
Const sourceEmpty$ = "Source is nothing, returns empty dictionary table!"
|
| 668 |
|
| 669 |
|
| 670 |
Creates a <see cref="System.Collections.Generic.Dictionary"/>`2 from an <see cref="System.Collections.Generic.IEnumerable"/>`1
|
| 671 |
according to a specified key selector function.
|
| 672 |
|
| 673 |
<typeparam name="T">Unique identifier provider <see cref="INamedValue.Key"/></typeparam>
|
| 674 |
|
| 675 |
|
| 676 |
<Extension>
|
| 677 |
Public Function ToDictionary(Of T As INamedValue)(source As IEnumerable(Of T)) As Dictionary(Of T)
|
| 678 |
If source Is Nothing Then
|
| 679 |
#If DEBUG Then
|
| 680 |
Call sourceEmpty.Warning
|
| 681 |
#End If
|
| 682 |
Return New Dictionary(Of T)
|
| 683 |
End If
|
| 684 |
|
| 685 |
Dim i As Integer = 0
|
| 686 |
Dim keys As New List(Of String)
|
| 687 |
|
| 688 |
Try
|
| 689 |
With New Dictionary(Of T)
|
| 690 |
For Each item As T In source
|
| 691 |
Call .Add(item.Key, item)
|
| 692 |
Call keys.Add(item.Key)
|
| 693 |
|
| 694 |
i += 1
|
| 695 |
Next
|
| 696 |
|
| 697 |
Return .ByRef
|
| 698 |
End With
|
| 699 |
Catch ex As Exception
|
| 700 |
ex = New Exception("key --> [ " & source(i).Key & " ]", ex)
|
| 701 |
ex = New Exception("keys --> " & keys.GetJson, ex)
|
| 702 |
|
| 703 |
Throw ex
|
| 704 |
End Try
|
| 705 |
End Function
|
| 706 |
|
| 707 |
|
| 708 |
将命名变量对象进行降维,名字作为键名,值作为键值,生成字典
|
| 709 |
|
| 710 |
|
| 711 |
|
| 712 |
|
| 713 |
<MethodImpl(MethodImplOptions.AggressiveInlining)>
|
| 714 |
<Extension>
|
| 715 |
Public Function FlatTable(Of T)(table As Dictionary(Of NamedValue(Of T))) As Dictionary(Of String, T)
|
| 716 |
Return table.ToDictionary(Function(item) item.Key,
|
| 717 |
Function(item) item.Value.Value)
|
| 718 |
End Function
|
| 719 |
|
| 720 |
<Extension> Public Function Add(Of TKey, TValue)(ByRef list As List(Of KeyValuePair(Of TKey, TValue)), key As TKey, value As TValue) As List(Of KeyValuePair(Of TKey, TValue))
|
| 721 |
If list Is Nothing Then
|
| 722 |
list = New List(Of KeyValuePair(Of TKey, TValue))
|
| 723 |
End If
|
| 724 |
list += New KeyValuePair(Of TKey, TValue)(key, value)
|
| 725 |
Return list
|
| 726 |
End Function
|
| 727 |
|
| 728 |
|
| 729 |
Adds an object to the end of the List`1.
|
| 730 |
|
| 731 |
<typeparam name="TKey"></typeparam>
|
| 732 |
<typeparam name="TValue"></typeparam>
|
| 733 |
<param name="list"></param>
|
| 734 |
<param name="key"></param>
|
| 735 |
<param name="value"></param>
|
| 736 |
|
| 737 |
<Extension> Public Function Add(Of TKey, TValue)(ByRef list As List(Of KeyValuePairObject(Of TKey, TValue)), key As TKey, value As TValue) As List(Of KeyValuePairObject(Of TKey, TValue))
|
| 738 |
If list Is Nothing Then
|
| 739 |
list = New List(Of KeyValuePairObject(Of TKey, TValue))
|
| 740 |
End If
|
| 741 |
list += New KeyValuePairObject(Of TKey, TValue)(key, value)
|
| 742 |
Return list
|
| 743 |
End Function
|
| 744 |
|
| 745 |
|
| 746 |
使用这个函数应该要确保value是没有重复的,假若<paramref name="removeDuplicated"/>是默认值的话.
|
| 747 |
|
| 748 |
|
| 749 |
|
| 750 |
<param name="d"></param>
|
| 751 |
|
| 752 |
<Extension>
|
| 753 |
Public Function ReverseMaps(Of T, V)(d As Dictionary(Of T, V), Optional removeDuplicated As Boolean = False) As Dictionary(Of V, T)
|
| 754 |
If removeDuplicated Then
|
| 755 |
Dim groupsData = From x In d Select x Group x By x.Value Into Group
|
| 756 |
Return groupsData.ToDictionary(
|
| 757 |
Function(g) g.Value,
|
| 758 |
Function(g) g.Group.First.Key)
|
| 759 |
Else
|
| 760 |
Return d.ToDictionary(
|
| 761 |
Function(x) x.Value,
|
| 762 |
Function(x) x.Key)
|
| 763 |
End If
|
| 764 |
End Function
|
| 765 |
|
| 766 |
|
| 767 |
一次性地使用一个键名的集合从字典之中选出一组数据
|
| 768 |
|
| 769 |
|
| 770 |
|
| 771 |
<param name="d"></param>
|
| 772 |
<param name="keys"></param>
|
| 773 |
<param name="skipNonExist"></param>
|
| 774 |
|
| 775 |
<Extension>
|
| 776 |
Public Function Selects(Of T, V)(d As Dictionary(Of T, V), keys As IEnumerable(Of T), Optional skipNonExist As Boolean = False) As V()
|
| 777 |
If skipNonExist Then
|
| 778 |
Return keys _
|
| 779 |
.Where(AddressOf d.ContainsKey) _
|
| 780 |
.Select(Function(k) d(k)) _
|
| 781 |
.ToArray
|
| 782 |
Else
|
| 783 |
Return keys.Select(Function(k) d(k)).ToArray
|
| 784 |
End If
|
| 785 |
End Function
|
| 786 |
|
| 787 |
<MethodImpl(MethodImplOptions.AggressiveInlining)>
|
| 788 |
<Extension>
|
| 789 |
Public Function [Select](Of K, V, T)(source As IEnumerable(Of KeyValuePair(Of K, V)), project As Func(Of K, V, T)) As IEnumerable(Of T)
|
| 790 |
Return source.Select(Function(value) project(value.Key, value.Value))
|
| 791 |
End Function
|
| 792 |
|
| 793 |
<MethodImpl(MethodImplOptions.AggressiveInlining)>
|
| 794 |
<Extension>
|
| 795 |
Public Function [Select](Of V, T)(source As IEnumerable(Of KeyValuePair(Of String, V)), project As Func(Of String, V, T)) As IEnumerable(Of T)
|
| 796 |
Return source.Select(Function(value) project(value.Key, value.Value))
|
| 797 |
End Function
|
| 798 |
End Module
|