委托和调用 [英] Delegate and Invoke

问题描述

调试时收到此错误：跨线程操作无效：xxxxxxxx访问ftrom一个线程而不是它创建的线程。


我一直在阅读，我知道我需要创建一个委托并使用xxxxx。调用....但我对此非常困惑



发生的事情是我创建了一个新的线程，它将在线收集一些数据然后分配它到xxxxx.Text属性


我被卡住了:(


ps。我已经知道 ：System.Windows.Forms.Control.CheckForIllegalCrossT hreadCalls = true / false;我不想使用它。


C＃.NET2.2




OK！我用它实现了它：

i receive this error when debugging: Cross-thread operation not valid: "xxxxxxxx" accessed ftrom a thread other than the thread it was created on.


I''ve been reading and i know that i will need to create a delegate and use xxxxx.invoke....but im very confused about it


What is going on is that i created a new thread that will collect a piece of data online and then assign it to xxxxx.Text property


im stuck :(

ps. i already know about: System.Windows.Forms.Control.CheckForIllegalCrossT hreadCalls = true/false; and i dont want to use this.

C#.NET2.2



OKAY! i achieved it using this:

展开 | 选择 | Wrap | 行号

推荐答案

你使用的例子有点令人困惑，我会提供一些更简洁的例子。

The example you used is a little confusing, I will provide a bit more concise one.

展开 | 选择 | Wrap | 行号

您使用的示例有点令人困惑，我将提供更简洁的示例。

The example you used is a little confusing, I will provide a bit more concise one.

展开 | 选择 | Wrap | 行号

委托用于捆绑操作/任务，为了我们的目的，它用于确保在特定（gui）线程上执行操作。


SetTextCallback d = new SetTextCallback（ SetSomeText）;

//创建我创建的类型的委托的实例，其中包含SetSomeText和SetSomeText。作为调用的函数。 （函数应该与委托声明匹配）


this.Invoke（d，new object [] {text}）;

//这告诉表单使用object []作为传递给委托函数的参数调用给定的委托。

// Invoke（）在GUI线程上执行委托操作

A delegate is used to bundle an operation/task, for our sake its used to make sure an operation is carried out on the specific(gui) thread.

SetTextCallback d = new SetTextCallback(SetSomeText);
//creates an instance of the delegate of the type i created, with "SetSomeText" as the function to call. (Function should match the delegate declaration)

this.Invoke(d, new object[] { text });
//this tells the form to invoke the given delegate with an object[] as the parameters to pass to the delegate''s function.
//Invoke() performs the delegate action on the GUI thread

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