vb.net 共享和静态之间有什么区别？
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What are the differences between Shared and Static?
提问by sab669
I'm a C# developer but I've inherited a legacy VB app today with 0 documentation what so ever. I've been starting to read through the code and reference the list of VB keywordsevery 5 seconds.
我是一名 C# 开发人员，但我今天继承了一个遗留的 VB 应用程序，其中有 0 个文档。我已经开始通读代码并每 5 秒引用一次VB 关键字列表。
I guess I don't understand the distinction between Sharedand Static.
我想我不明白之间的区别Shared和Static。
Reading this post: https://stackoverflow.com/a/1980293/1189566
阅读这篇文章：https: //stackoverflow.com/a/1980293/1189566
It states:
它指出：
VB doesn't have
static, it hasshared
VB 没有
static，它有shared
But you can see in the list of keywords linked above, Staticis a reserved keyword. It looks like Staticis only applicable to fields, where as Sharedcan be on a method ora field?
但是你可以在上面链接的关键字列表中看到，Static是一个保留关键字。看起来Static只适用于字段，哪里Shared可以用于方法或字段？
I guess ultimately I'm just hoping someone could expand upon the answer I linked to provide some more details for a VB noob.
我想最终我只是希望有人可以扩展我链接的答案，为 VB 菜鸟提供更多详细信息。
For example, say I had this
例如，假设我有这个
public class MyClass
Dim myVar as Integer = 1
public shared sub UpdateMyVar()
myVar = 2
end sub
end class
public class MyOtherClass
Dim cOne = New MyClass()
Dim cTwo = New MyClass()
cOne.UpdateMyVar()
txtMyTextBox.Text = cTwo.myVar.ToString()
end class
Please forgive any syntactical issues. Assume this code compiles. I've literally just started skimming the code an hour and a half ago.
请原谅任何语法问题。假设这段代码可以编译。从字面上看，我一个半小时前才开始浏览代码。
Would cTwo.myVarbe 1or 2? I'm guessing 2since Sharedseems to affect all instances of a class? That seems tremendously dangerous.
会cTwo.myVar是1还是2？我猜2因为Shared似乎影响了一个类的所有实例？这似乎非常危险。
回答by Matt Wilko
The equivalent of the C# Staticmethodmodifier is Sharedin VB.net
C#Static方法修饰符的等价物Shared在 VB.net 中
The closest equivalent of the C# Staticclassmodifier in VB.Net is a Module
VB.Net中与 C#Static类修饰符最接近的等价物是Module
The Statickeyword in VB.NET defines a local variable that exists for the lifetime of the process. There is no equivalent of this in C#.
StaticVB.NET 中的关键字定义了一个在进程的生命周期内存在的局部变量。在 C# 中没有这样的等价物。
For a great reference of comparison between the two see this link: https://www.harding.edu/fmccown/vbnet_csharp_comparison.html
有关两者之间比较的重要参考，请参阅此链接：https: //www.harding.edu/fmccown/vbnet_csharp_comparison.html
回答by Wade73
For VB.Net you use shared exactly like Static is used in C#, but VB.Net has a static keyword as well and it is used to retain a variable value even after the method call has ended. So the next time you call a method it will have that previous value. MSDN has a more detailed explanation here - http://msdn.microsoft.com/en-us/library/z2cty7t8.aspx
对于 VB.Net，您使用 shared 与 C# 中使用的 Static 完全一样，但 VB.Net 也有一个 static 关键字，即使在方法调用结束后，它也用于保留变量值。因此，下次您调用方法时，它将具有先前的值。MSDN 这里有更详细的解释 - http://msdn.microsoft.com/en-us/library/z2cty7t8.aspx
From the link there are some interesting behaviors:
从链接中有一些有趣的行为：
When you declare a static variable in a Shared procedure, only one copy of the static variable is available for the whole application. You call a Shared procedure by using the class name, not a variable that points to an instance of the class.
When you declare a static variable in a procedure that isn't Shared, only one copy of the variable is available for each instance of the class. You call a non-shared procedure by using a variable that points to a specific instance of the class.
在共享过程中声明静态变量时，整个应用程序只能使用静态变量的一个副本。您可以使用类名调用共享过程，而不是使用指向类实例的变量。
当您在非 Shared 的过程中声明静态变量时，该类的每个实例只能使用该变量的一个副本。您可以使用指向类的特定实例的变量来调用非共享过程。
