使用具有非静态方法的委托[没有选择的答案] [英] Using delegates with non static methods [no picked answer]

问题描述

我非常有信心，我应该能够使用具有非静态方法的委托，但以下内容会给我一个错误：

I am pretty confident that I should be able to use a delegate with a non-static method, but the below is giving me an error:

public class TestClass
{
    private delegate void TestDelegate();
    TestDelegate testDelegate = new TestDelegate(MyMethod);

    private void MyMethod()
    {
        Console.WriteLine("Foobar");
    }
}

我得到的错误是：

字段初始化器无法引用非静态字段，方法或
属性

A field initializer cannot reference the non-static field, method, or property

如果我将MyMethod设为静态，则一切正常。我以为我可以将委托与非静态方法一起使用是我的错吗（我确信我以前记得这样做）。

If I make MyMethod static, everything works fine. Was I simply wrong in thinking I could use a delegate with a non static method (I am sure I remember doing so in the past).

推荐答案

回答这个问题，因为我不得不显示更多评论并做了两次尝试，然后才意识到实际的答案是什么。

Answering this as I had to 'show more comments' and do a double take before I realised what the actual answer was.

错误：

字段初始化器无法引用非静态字段，方法或
属性

A field initializer cannot reference the non-static field, method, or property

解决方案是在构造函数内部初始化委托。

The solution is to initialise the delegate inside the constructor.

我在C＃语言参考本身中找不到它，

I couldn't actually find this in the C# Language Reference itself, and a lot of the stock examples are static methods.

ie

public class TestClass
{
    private delegate void TestDelegate();
    TestDelegate testDelegate;

    public TestClass()
    {
        testDelegate = new TestDelegate(MyMethod);
    }

    private void MyMethod()
    {
        Console.WriteLine("Foobar");
    }
}

这篇关于使用具有非静态方法的委托[没有选择的答案]的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！