本文整理汇总了VB.NET中System.Collections.Concurrent.ConcurrentDictionary<TKey,TValue>.TryAdd方法的典型用法代码示例。如果您正苦于以下问题:VB.NET ConcurrentDictionary<TKey,TValue>.TryAdd方法的具体用法?VB.NET ConcurrentDictionary<TKey,TValue>.TryAdd怎么用?VB.NET ConcurrentDictionary<TKey,TValue>.TryAdd使用的例子?那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类System.Collections.Concurrent.ConcurrentDictionary<TKey,TValue>
的用法示例。
在下文中一共展示了ConcurrentDictionary<TKey,TValue>.TryAdd方法的1个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的VB.NET代码示例。
示例1: CD_TryXYZ
'Imports System.Collections.Concurrent
Class CD_TryXYZ
' Demonstrates:
' ConcurrentDictionary<TKey, TValue>.TryAdd()
' ConcurrentDictionary<TKey, TValue>.TryUpdate()
' ConcurrentDictionary<TKey, TValue>.TryRemove()
Shared Sub Main()
Dim numFailures As Integer = 0
' for bookkeeping
' Construct an empty dictionary
Dim cd As ConcurrentDictionary(Of Integer, [String]) = New ConcurrentDictionary(Of Integer, String)()
' This should work
If Not cd.TryAdd(1, "one") Then
Console.WriteLine("CD.TryAdd() failed when it should have succeeded")
numFailures += 1
End If
' This shouldn't work -- key 1 is already in use
If cd.TryAdd(1, "uno") Then
Console.WriteLine("CD.TryAdd() succeeded when it should have failed")
numFailures += 1
End If
' Now change the value for key 1 from "one" to "uno" -- should work
If Not cd.TryUpdate(1, "uno", "one") Then
Console.WriteLine("CD.TryUpdate() failed when it should have succeeded")
numFailures += 1
End If
' Try to change the value for key 1 from "eine" to "one"
' -- this shouldn't work, because the current value isn't "eine"
If cd.TryUpdate(1, "one", "eine") Then
Console.WriteLine("CD.TryUpdate() succeeded when it should have failed")
numFailures += 1
End If
' Remove key/value for key 1. Should work.
Dim value1 As String = ""
If Not cd.TryRemove(1, value1) Then
Console.WriteLine("CD.TryRemove() failed when it should have succeeded")
numFailures += 1
End If
' Remove key/value for key 1. Shouldn't work, because I already removed it
Dim value2 As String = ""
If cd.TryRemove(1, value2) Then
Console.WriteLine("CD.TryRemove() succeeded when it should have failed")
numFailures += 1
End If
' If nothing went wrong, say so
If numFailures = 0 Then
Console.WriteLine(" OK!")
End If
End Sub
End Class