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VB.NET ConcurrentDictionary<TKey,TValue>.GetOrAdd方法代码示例

本文整理汇总了VB.NET中System.Collections.Concurrent.ConcurrentDictionary<TKey,TValue>.GetOrAdd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>.GetOrAdd方法的具体用法?VB.NET ConcurrentDictionary<TKey,TValue>.GetOrAdd怎么用?VB.NET ConcurrentDictionary<TKey,TValue>.GetOrAdd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。您也可以进一步了解该方法所在System.Collections.Concurrent.ConcurrentDictionary<TKey,TValue>的用法示例。


在下文中一共展示了ConcurrentDictionary<TKey,TValue>.GetOrAdd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_GetOrAddOrUpdate

' Imports System.Collections.Concurrent
' Imports System.Threading.Tasks

Class CD_GetOrAddOrUpdate

    ' Demonstrates:
    ' ConcurrentDictionary<TKey, TValue>.AddOrUpdate()
    ' ConcurrentDictionary<TKey, TValue>.GetOrAdd()
    ' ConcurrentDictionary<TKey, TValue>[]
    Shared Sub Main()
        ' Construct a ConcurrentDictionary
        Dim cd As New ConcurrentDictionary(Of Integer, Integer)()

        ' Bombard the ConcurrentDictionary with 10000 competing AddOrUpdates
        Parallel.For(0, 10000,
                       Sub(i)
                           ' Initial call will set cd[1] = 1. 
                           ' Ensuing calls will set cd[1] = cd[1] + 1
                           cd.AddOrUpdate(1, 1, Function(key, oldValue) oldValue + 1)
                       End Sub)

        Console.WriteLine("After 10000 AddOrUpdates, cd[1] = {0}, should be 10000", cd(1))

        ' Should return 100, as key 2 is not yet in the dictionary
        Dim value As Integer = cd.GetOrAdd(2, Function(key) 100)
        Console.WriteLine("After initial GetOrAdd, cd[2] = {0} (should be 100)", value)

        ' Should return 100, as key 2 is already set to that value
        value = cd.GetOrAdd(2, 10000)
        Console.WriteLine("After second GetOrAdd, cd[2] = {0} (should be 100)", value)
    End Sub
End Class
开发者ID:VB.NET开发者,项目名称:System.Collections.Concurrent,代码行数:32,代码来源:ConcurrentDictionary.GetOrAdd


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