你可以使用預定義的Action <T> 在Control.BeginInvoke中

Question

我有一些線程檢查，我可以通過調用BeginInvoke(new Action<string,string>........得到以下工作BeginInvoke(new Action<string,string>........但我想知道你是否可以某種方式使用預定義的動作？

private Action<string, string> DoSomething();

private void MakeItHappen(string InputA, string InputB)
{
  if (this.InvokeRequired)
  {
    this.BeginInvoke(DoSomething(InputA, InputB));
  }
  else
  {
     Label.Text = "Done";
     MyOtherGUIItem.Visible = false;
  }

}

Answer 1

這是你的意思嗎？

private Action<string, string> _DoSomething;

public void ConfigureToSecondThanFirstByExistingFunction()
{
    _DoSomething = MyMakeItLowerImplementation;
}

public void ConfigureToFirstThenSecondByLambda()
{
    _DoSomething = (a, b) => Console.WriteLine(a + b);
}

public void CallMe()
{
    ConfigureToSecondThanFirstByExistingFunction();
    //ConfigureToFirstThenSecondByLambda();

    _DoSomething("first", "second");
}

private void MyMakeItLowerImplementation(string a, string b)
{
    Console.WriteLine(b + a);
}

Answer 2

如果我理解正確你想要這樣的東西？

private delegate void updateDelegate(string p1, string p2);
private updateDelegate DoSomething;

private void MakeItHappen(string InputA, string InputB)
{
    if (this.InvokeRequired)
    {
        this.BeginInvoke(DoSomething, InputA, InputB);
    }
    else
    {
        //Do stuff
    }
}

Answer 3

您必須將普通delegate傳遞給BeginInvoke 。 您可以使用變量捕獲來包裝您的參數，如下所示：

private void MakeItHappen(string InputA, string InputB)
{
    if (this.InvokeRequired)
    {
        this.BeginInvoke((Action)delegate () { 
            MakeItHappen(InputA, InputB); 
        });
    }
    else
    {
        // do stuff with InputA and InputB
    }
}

Answer 4

這條路？：

private delegate void DoSomethingHandler(string A, string B);
private event DoSomethingHandler DoSomething;

public void Start()
{
   DoSomething = (a, b) => { /*doStuff*/ };
}

private void MakeItHappen(string InputA, string InputB)
{
  if (this.InvokeRequired)
  {
    this.BeginInvoke(DoSomething, InputA, InputB);
  }
  else
  {
    //Do stuff
  }    
}