本文整理匯總了VB.NET中System.Collections.Concurrent.ConcurrentDictionary<TKey,TValue>.GetOrAdd方法的典型用法代碼示例。如果您正苦於以下問題：VB.NET ConcurrentDictionary<TKey,TValue>.GetOrAdd方法的具體用法？VB.NET ConcurrentDictionary<TKey,TValue>.GetOrAdd怎麽用？VB.NET ConcurrentDictionary<TKey,TValue>.GetOrAdd使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類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個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的VB.NET代碼示例。
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