LINQ分區操作符
把輸入序列分為兩個獨立的部分,而不重新排列序列中的元素,然後返回其中一個。
操作符 | 描述 | C#查詢表達式語法 | VB查詢表達式語法 |
---|---|---|---|
Skip | 跳過一些指定的序列中一些的元素,並返回其餘的 | 不適用 | Skip |
SkipWhile | 相同,唯一的例外跳到多個元素,跳過的是由一個布爾條件指定 | 不適用 | Skip While |
Take | 采取元素指定數量的序列,並跳過其餘的 | 不適用 | Take |
TakeWhile | 相同,以不同的事實,即許多元素采取的是由一個布爾條件指定 | 不適用 | Take While |
Skip例子- 查詢表達式
VB
Module Module1 Sub Main() Dim words = {"once", "upon", "a", "time", "there", "was", "a", "jungle"} Dim query = From word In words Skip 4 Dim sb As New System.Text.StringBuilder() For Each str As String In query sb.AppendLine(str) Console.WriteLine(str) Next Console.ReadLine() End Sub End Module
當在VB上述代碼被編譯和執行時,它產生了以下結果:
there was a jungle
Skip While示例 - 查詢表達式
VB
Module Module1 Sub Main() Dim words = {"once", "upon", "a", "time", "there", "was", "a", "jungle"} Dim query = From word In words Skip While word.Substring(0, 1) = "t" Dim sb As New System.Text.StringBuilder() For Each str As String In query sb.AppendLine(str) Console.WriteLine(str) Next Console.ReadLine() End Sub End Module
當在VB上述代碼被編譯和執行時,它產生了以下結果:
once upon a was a jungle
Take例子- 查詢表達式
VB
Module Module1 Sub Main() Dim words = {"once", "upon", "a", "time", "there", "was", "a", "jungle"} Dim query = From word In words Take 3 Dim sb As New System.Text.StringBuilder() For Each str As String In query sb.AppendLine(str) Console.WriteLine(str) Next Console.ReadLine() End Sub End Module
當在VB上述代碼被編譯和執行時,它產生了以下結果:
once upon a
Take While示例 - 查詢表達式
VB
Module Module1 Sub Main() Dim words = {"once", "upon", "a", "time", "there", "was", "a", "jungle"} Dim query = From word In words Take While word.Length < 6 Dim sb As New System.Text.StringBuilder() For Each str As String In query sb.AppendLine(str) Console.WriteLine(str) Next Console.ReadLine() End Sub End Module
當在VB上述代碼被編譯和執行時,它產生了以下結果:
once upon a time there was a