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VB.NET Enumerable.AsEnumerable<TSource>方法代码示例

本文整理汇总了VB.NET中System.Linq.Enumerable.AsEnumerable<TSource>方法的典型用法代码示例。如果您正苦于以下问题:VB.NET Enumerable.AsEnumerable<TSource>方法的具体用法?VB.NET Enumerable.AsEnumerable<TSource>怎么用?VB.NET Enumerable.AsEnumerable<TSource>使用的例子?那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。


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示例1: Clump

Dim output As New System.Text.StringBuilder

' A custom class.
Class Clump(Of T)
    Inherits List(Of T)

    ' Constructor.
    Public Sub New(ByVal collection As IEnumerable(Of T))
        MyBase.New(collection)
    End Sub

    ' Custom implementation of Where().
    Function Where(ByVal predicate As Func(Of T, Boolean)) As IEnumerable(Of T)
        output.AppendLine("In Clump's implementation of Where().")
        Return Enumerable.Where(Me, predicate)
    End Function
End Class

Sub AsEnumerableEx1()
    ' Create a new Clump(Of T) object.
    Dim fruitClump As New Clump(Of String)(New String() _
                                       {"apple", "passionfruit", "banana",
                                        "mango", "orange", "blueberry",
                                        "grape", "strawberry"})

    ' First call to Where():
    ' Call Clump's Where() method with a predicate.
    Dim query1 As IEnumerable(Of String) =
    fruitClump.Where(Function(fruit) fruit.Contains("o"))
    output.AppendLine("query1 has been created." & vbCrLf)

    ' Second call to Where():
    ' First call AsEnumerable() to hide Clump's Where() method and thereby
    ' force System.Linq.Enumerable's Where() method to be called.
    Dim query2 As IEnumerable(Of String) =
    fruitClump.AsEnumerable().Where(Function(fruit) fruit.Contains("o"))
    output.AppendLine("query2 has been created.")

    ' Display the output.
    Console.WriteLine(output.ToString())
End Sub
开发者ID:VB.NET开发者,项目名称:System.Linq,代码行数:41,代码来源:Enumerable.AsEnumerable

输出:

In Clump's implementation of Where().
query1 has been created.

query2 has been created.


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