使用反跨线程函数返回值 [英] Using an anti-cross-thread function to return a value

问题描述

我有这个代码来绕过每个人存在的祸根

I have this code to get around the bane of everyone's existence

delegate int GetSelectedIndicesCountCallback(ListBox thing);
private int GetSelectedIndicesCount(ListBox thing)
{
 if (this.InvokeRequired)
 {
  GetSelectedIndicesCountCallback d = new GetSelectedIndicesCountCallback(GetSelectedIndicesCount);
  Invoke(d, new object[] { thing });
 }
 else
 {
  return thing.SelectedIndices.Count;
 }
 return 0;
}

return 0 在那里是因为没有它它会出错.但是，它总是返回0.我不知道如何让它返回另一个值.

The return 0 being there because it'd error without it. However, it always returns 0. I don't know how to get it to return the other value.

推荐答案

调用 Control.Invoke 将返回您的方法的值.您所要做的就是将其转换为 int 并返回.

The call to Control.Invoke will return the value of your method. All you have to do is cast it to int and return it.

return (int)Invoke(d, new object[] { thing });

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