设置RunWorkerCompleted值 [英] Setting RunWorkerCompleted value

问题描述

如果我有一名后台工作人员在做一些工作，

If i have a background worker that does some tasks in its do work

    String val= getVal("Val");
    byte[] b = (byte[])e.Argument;

    b = getData.FromPlace(val);

如何将b的vakue传递给runworkercompleted方法?

How do i pass the vakue of b to the runworkercompleted method?

推荐答案

您可以使用闭包

void Main()
{

    var bw = new BackgroundWorker();

    byte[] b;

    bw.DoWork += (sender, args) => {

        b = DoStuff();
    };
}

byte[] DoStuff() {

    String val= getVal("Val");
    byte[] b = (byte[])e.Argument;

    b = getData.FromPlace(val);

    return b;
}

您还可以在事件args对象上使用return Result属性.我认为这种方式具有更大的灵活性.

You could also use return Result property on the event args object. I think this way gives more flexibility.

void Main()
{
    var bw = new BackgroundWorker();

    bw.DoWork += (sender, args) => {

        args.Result = DoStuff();
    };

    bw.RunWorkerCompleted += (sender, args) =>  {
        var result = args.Result as byte[];
    };

    bw.RunWorkerAsync();
}

byte[] DoStuff() {
    return new byte[10];
}

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