C＃ - Method必须具有返回类型

I am having problems calling a method in C#, I keep getting the message "Method (calculate) must have a return type".

我在调用C＃中的方法时遇到问题，我不断收到消息“Method（calculate）必须有一个返回类型”。

using System.Diagnostics;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

        }
    }



    public class Hello : Form
    {
        public string test { get; set; }
        calculate();
    }


    public class Hello2 : Form
    {
        public void calculate()
        {
            Process.Start("test.exe");

        }
    }

4 个解决方案

#1

calculate(); is an invalid method signature in your Hello class. It is missing the return type and it also needs a body.

计算（）;是Hello类中的无效方法签名。它缺少返回类型，它还需要一个正文。

At a minimum the signature should look like:

签名至少应如下所示：

public class Hello : Form
{
    public string test { get; set; }
    void calculate() {}
}

#2

public class Hello : Form
{
    public string test { get; set; }
    **calculate();**
}

Is not valid because calculate() is not a constructor or method. You cannot call methods from the class scope.

无效，因为calculate（）不是构造函数或方法。您无法从类范围调用方法。

#3

That's because you are trying to call it inside the body of a class. You cannot do this in C#. You can only call methods from other methods or constructors. The syntax parser thinks that you are trying to define a new method and forgot to mention the type.

那是因为你试图在一个类的主体内调用它。你不能在C＃中做到这一点。您只能从其他方法或构造函数中调用方法。语法分析器认为您正在尝试定义新方法而忘记提及类型。

#4

if calculate doesn't return anything you have to be explicit and say that with void.

如果计算不返回任何东西，你必须明确，并说无效。

It also needs a method body (unless it is marked as abstract).

它还需要一个方法体（除非它被标记为抽象）。

public class Hello : Form
{
    public string test { get; set; }
    void calculate() {}
}

#1