为什么我不能在另一个类中调用公共方法? [英] Why can't I call a public method in another class?

问题描述

我让这两个类相互作用，并且我试图从第一类中调用四个不同的类以用于第二类.

I have got these two classes interacting and I am trying to call four different classes from class one for use in class two.

这些方法是公共的，并且它们确实返回值，但是由于某种原因，没有建立连接. 我尝试时遇到的错误是:"An object reference is required for the nonstatic field, method, or property 'GradeBook.[method I want called]'"

The methods are public and they do return values but for some reason there is not a connection being made. The error I get when I try is: "An object reference is required for the nonstatic field, method, or property 'GradeBook.[method I want called]'"

我已初始化所有内容.我不想将这些方法创建为静态方法.我再次阅读了作业的详细信息，我什至不应该这样做，但我似乎无法做到这一点.

I have everything initialized. I don't want to create the methods as static. I read over the specifics of my assignment again and I'm not even supposed to but I can't seem to get this to work anyway I word it.

myGradeBook.[方法] GraceBook.[方法]

myGradeBook.[method] GraceBook.[method]

这一切似乎都产生了错误.

It all seems to create errors.

当前错误:

The best overloaded method match or 'System.Console.WriteLine(string, object)' has some invalid arguments.

Arugment '2': cannot convert from 'method group' to 'object'

我什至不明白那些意思....

I'm not even sur what those mean....

我只是通过Visual Studio的逐步进入"功能解决了该问题. 我不知道为什么要花这么长时间才能使用它.

I just fixed that problem thanks to the Step Into feature of Visual Studio. I don't know why it took me so long to use it.

推荐答案

您正试图在该类上调用实例方法.要在类上调用实例方法，必须创建一个在其上调用该方法的实例.如果要在非实例上调用该方法，请添加static关键字.例如

You're trying to call an instance method on the class. To call an instance method on a class you must create an instance on which to call the method. If you want to call the method on non-instances add the static keyword. For example

class Example {
  public static string NonInstanceMethod() {
    return "static";
  }
  public string InstanceMethod() { 
    return "non-static";
  }
}

static void SomeMethod() {
  Console.WriteLine(Example.NonInstanceMethod());
  Console.WriteLine(Example.InstanceMethod());  // Does not compile
  Example v1 = new Example();
  Console.WriteLine(v1.InstanceMethod());
}

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