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类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