如何将参数传递给新的backgroundworker [英] How to pass parameters to new backgroundworker

问题描述

你好，



我想创建一个名为PlayerSearch的新后台工作者，为子SearchPlayers（Search As String）添加一个处理程序，然后运行BackgroundWorker的。然后它做PlayerSearch.RunWorkerAsync（Rixterz）。问题是你不能使用AddressOf的参数，所以我不能将SearchPlayers分配给PlayerSearch并使用搜索参数。有没有办法做到这一点？如果是这样，我怎么能把多个参数传递给它？



-Rixterz

Hello,

I'd like to create a new backgroundworker called PlayerSearch, add a handler to the sub SearchPlayers(Search As String), and then run the backgroundworker. Then it does PlayerSearch.RunWorkerAsync("Rixterz"). The problem is that you cannot use parameters with AddressOf, so I cannot assign SearchPlayers to PlayerSearch and use the "Search" parameter. Is there a way to do this? If so, how could I pass multiple parameters to it?

-Rixterz

推荐答案

你不要需要AddressOf，您需要做的就是在调用RunWorkerAsync方法时将对象作为参数传递。 DoWork事件处理程序有一个DoWorkEventArgs参数，该参数具有包含对象的Argument属性 - 您只需将其强制转换为您传递的类型（在本例中为字符串，但它可以是任何类型，包括列表你去了。

You don't need AddressOf, all you need to do is pass the object as the parameter when you call the RunWorkerAsync method. The DoWork event handler has a DoWorkEventArgs parameter, which has an Argument property which contains the object - all you have to do is cast it back to the type you passed through (in this case a string, but it can be any type including lists of your own classes) and off you go.

解决方案1中描述的方法并不是最好的，因为提到了这种可能容易出错的操作。更好的方法是使用实​​例（非静态）方法并将所有成员传递给this。请看我过去的答案：

如何将ref参数传递给线程 [ ^ ]，

更改线程（生产者）启动后的参数 [ ^ ]，

C＃中的多线程 [ ^ ]，

使代码线程安全 [ ^ ]。

-SA

The approach described in Solution 1 is not the best, because of that casting mentioned, a potentially error-prone operation. Much better approach is using an instance (non-static) method and passing all member through "this". Please see my past answers:
How to pass ref parameter to the thread[^],
Change parameters of thread (producer) after it is started[^],
MultiThreading in C#[^],
Making Code Thread Safe[^].

—SA

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