设置 RunWorkerCompleted 值

发布于 2024-10-28 08:24:50 字数 213 浏览 2 评论 0原文

如果我有一个后台工作人员在其 do work 中执行一些任务，

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

    b = getData.FromPlace(val);

我如何将 b 的 vakue 传递给 runworkercompleted 方法？

原文

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);

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

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疧_╮線 2024-11-04 08:24:50

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;
}

也可以在事件参数对象上使用 return Result 属性。我认为这种方式提供了更多的灵活性。

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];
}

You could use closure

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;
}

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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