VB.NET AsyncLocal<T>类代码示例

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

在下文中一共展示了AsyncLocal<T>类的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，您的评价将有助于我们的系统推荐出更棒的VB.NET代码示例。

示例1: Example

' 导入命名空间
Imports System.Threading
Imports System.Threading.Tasks

Module Example
    Dim _asyncLocalString As New AsyncLocal(Of String)()

    Dim _threadLocalString As New ThreadLocal(Of String)()

    Async Function AsyncMethodA() As Task
        ' Start multiple async method calls, with different AsyncLocal values.
        ' We also set ThreadLocal values, to demonstrate how the two mechanisms differ.
        _asyncLocalString.Value = "Value 1"
        _threadLocalString.Value = "Value 1"
        Dim t1 = AsyncMethodB("Value 1")

        _asyncLocalString.Value = "Value 2"
        _threadLocalString.Value = "Value 2"
        Dim t2 = AsyncMethodB("Value 2")

        ' Await both calls
        await t1
        await t2
     End Function

    Async Function AsyncMethodB(expectedValue As String) As Task
        Console.WriteLine("Entering AsyncMethodB.")
        Console.WriteLine("   Expected '{0}', AsyncLocal value is '{1}', ThreadLocal value is '{2}'", 
                          expectedValue, _asyncLocalString.Value, _threadLocalString.Value)
        await Task.Delay(100)
        Console.WriteLine("Exiting AsyncMethodB.")
        Console.WriteLine("   Expected '{0}', got '{1}', ThreadLocal value is '{2}'", 
                          expectedValue, _asyncLocalString.Value, _threadLocalString.Value)
    End Function

   Public Sub Main()
       AsyncMethodA.Wait()
   End Sub
End Module

开发者ID:VB.NET开发者，项目名称:System.Threading，代码行数:39，代码来源:AsyncLocal

输出：

Entering AsyncMethodB.
Expected 'Value 1', AsyncLocal value is 'Value 1', ThreadLocal value is 'Value 1'
Entering AsyncMethodB.
Expected 'Value 2', AsyncLocal value is 'Value 2', ThreadLocal value is 'Value 2'
Exiting AsyncMethodB.
Expected 'Value 2', got 'Value 2', ThreadLocal value is ''
Exiting AsyncMethodB.
Expected 'Value 1', got 'Value 1', ThreadLocal value is ''

注：本文中的System.Threading.AsyncLocal<T>类示例整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。