如何从静态方法访问控件？ [英] How does one access a control from a static method?

问题描述

我在C＃.NET中有一个应用程序，它具有 MainForm 和几个类。

I have an application in C# .NET which has a MainForm and a few classes.

其中一个这些类从网络接收传入的数据消息。我需要将这些消息的文本附加到 MainForm 上的多行文本框中。

One of these classes receives incoming data messages from a network. I need to get these message's text appended into a multi-line textbox on the MainForm.

我可以发送通过将方法设为静态，将消息发送到 MainForm 中的方法，但是静态方法无法访问 MainForm

I can send the message to a method in the MainForm by making the method static, but then the static method cannot access the MainForm's controls.

TheIncomingDataClass.cs

namespace TheApplicationName
{
     class TheIncomingDataClass
     {

     public void IncomingMessage(IncomingMessageType message)
     {
          TheApplicationName.MainForm.ReceiveMSG(message);
     }

MainForm.cs

public static void ReceiveMSG(string message)
{
     txtDisplayMessages.AppendText(message); //This line causes compile error
}

编译错误：

非静态字段，方法或
属性'TheApplicationName.MainForm.txtDisplayMessages'需要对象引用

An object reference is required for the nonstatic field, method, or property 'TheApplicationName.MainForm.txtDisplayMessages'

推荐答案

静态方法无法访问txtDisplayMessages之类的成员，因为它不是该实例的一部分。我建议您对静态方法的概念有所了解，因为这是一个与语言无关的概念。最好通过删除static修饰符来实现该方法，因为它不需要是静态的-看来它需要由该对象的特定实例调用。

A static method doesn't have access to members like txtDisplayMessages because it is not a part of that instance. I suggest you do some reading on the concepts of static methods and whatnot, because that is a fairly language agnostic concept. That method would best be served by removing the static modifier, because it doesn't need to be static - it appears that it would need to be called by that particular instance of that object.

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