Visual Basic .NET使用Async / Await执行线程安全的调用
示例
如果尝试从其他线程更改UI线程上的对象，则会得到跨线程操作异常：
Private Sub Button_Click(sender As Object, e As EventArgs) Handles MyButton.Click
' Cross thread-operation exception as the assignment is executed on a different thread
' from the UI one:
Task.Run(Sub()MyButton.Text= Thread.CurrentThread.ManagedThreadId)
End Sub在VB14.0和.NET4.5之前，该解决方案是在UI线程上调用赋值和对象：
Private Sub Button_Click(sender As Object, e As EventArgs) Handles MyButton.Click
' This will run the conde on the UI thread:
MyButton.Invoke(Sub()MyButton.Text= Thread.CurrentThread.ManagedThreadId)
End Sub在VB14.0中，我们可以Task在其他线程上运行，然后在执行完成后恢复上下文，然后使用Async/Await执行分配：
Private Async Sub Button_Click(sender As Object, e As EventArgs) Handles MyButton.Click
' This will run the code on a different thread then the context is restored
' so the assignment happens on the UI thread:
MyButton.Text= Await Task.Run(Function() Thread.CurrentThread.ManagedThreadId)
End Sub
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