vb.net 如何在类和模块中定义 Main 方法？
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How do I define a Main method in a Class versus a Module?
提问by nhat
I was just practicing some coding and noticed that I was able to use class instead of Module in VB .NET. So I replaced my module to class and I got this error message:
我只是在练习一些编码，并注意到我能够在 VB .NET 中使用类而不是模块。所以我将我的模块替换为 class 并收到此错误消息：
No accessible 'Main' method with an appropriate signature was found in 'practicevb'.practicevb
在“practicevb”.practicevb 中找不到具有适当签名的可访问“Main”方法
I made sure that the startup object was set correctly in Properties > Application > Startup Objects.
我确保启动对象在Properties > Application > Startup Objects.
The error message disappears if I change it back to Module but I would like to keep it class since the other parts of my code I changed to class and didn't return and error messages.
如果我将其改回 Module ，错误消息就会消失，但我想保留它的类，因为我的代码的其他部分更改为类并且没有返回和错误消息。
Class Atic
Sub Main()
Console.WriteLine("Hello, this proram will calcaulate the quadratic forumla ax^2 + bx + c")
Dim Quads As New Quads
Quads.Calc()
Console.ReadKey()
End Sub
End Class
回答by N0Alias
My guess is that your application is a command line application. Make the class Public and Shared...
我的猜测是您的应用程序是命令行应用程序。使类公开和共享...
Public Shared Sub Main()
End Sub
回答by Sudantha
If you are NEWto Classes
如果你是新来的课程
Classes is a different concept than a modulemodule is a collection of functions , but classis a template which should be instantiating an object and use.
类是一个与module模块不同的概念，模块是函数的集合，而是class一个模板，应该实例化一个对象并使用。
First go though the OOP basics in VB.NET here
首先在此处了解 VB.NET 中的 OOP 基础知识
If your are a Pro
如果您是专业人士
Use Shared Sub Main()...
使用Shared Sub Main()...
回答by dotNET
For any future reader, if your Main()is in a Module(not Class Module) and you're still getting this error, make sure the method does not take any parameters. Unlike C++, VB.NET doesn't take command-line arguments as a Main method's parameters. Instead you should define a zero-parameter Main() method and use My.Application.CommandLineArgsto access the supplied parameters. I banged head for some time before I realized this.
对于任何未来的读者，如果您Main()在模块（而不是类模块）中并且仍然收到此错误，请确保该方法不带任何参数。与 C++ 不同，VB.NET 不将命令行参数作为 Main 方法的参数。相反，您应该定义一个零参数 Main() 方法并用于My.Application.CommandLineArgs访问提供的参数。在我意识到这一点之前，我撞了一段时间的头。
回答by Jord?o
Modulesare just classes where all members are shared (static in C#).
模块只是共享所有成员的类（C# 中的静态）。
If you want to change a module into a class, just add the Sharedmodifier to its members:
如果要将模块更改为类，只需在Shared其成员中添加修饰符：
Shared Sub Main() ...
Although, I really think modules are a good ideaand a perfect place to put your Mainfunction.
虽然，我真的认为模块是一个好主意，也是放置Main功能的理想场所。
回答by Jon Egerton
The Main method is required as the entry point of your applications. I needs to be calleable without instantiating an object as there is no way of doing this before your program starts.
Main 方法需要作为应用程序的入口点。我需要在不实例化对象的情况下可调用，因为在程序启动之前无法执行此操作。
Either just make this method and the class static as has bene said, or better have a module just for this entry point, then instantiate an object and go from there.
要么像 bene 所说的那样将这个方法和类设为静态，要么最好为这个入口点创建一个模块，然后实例化一个对象并从那里开始。
回答by bluetata
Define a Public Sub Mainprocedure for your project. Declare it as Sharedif and only if you define it inside a class.
Public Sub Main为您的项目定义一个过程。如同Shared且仅当您在类中定义它时声明它。
