C# 如何在方法中声明/设置静态变量
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How to declare/set a static variable inside a method
提问by kmxillo
I cannot get/set a static variable inside a method. How can I do it?
我无法在方法中获取/设置静态变量。我该怎么做？
public class LoginDialog
{
// class members
private static string _user="" ;
public void RunDialog()
{
_user = "Peter";
}
public static string _User { get; set; }
}
After reading the answers I edit my code and I cant still get the static variable _user. What I am doing wrong?
阅读答案后，我编辑了我的代码，但仍然无法获得静态变量 _user。我做错了什么？
public class LoginDialog
{
private static string _user;
public void RunDialog()
{
LoginDialog._user = "Peter";
}
public static string _User { get {return _user;} }
}
When I declare like that everything works fine, but rather I would like to declare inside the method.
当我声明一切正常时，我想在方法内部声明。
private static string _user="Peter";
采纳答案by phoog
The problem is that you're setting a private static field, and then presumably reading the public static property elsewhere. In your code, the public static property is completely independent of the private static field.
问题是您正在设置一个私有静态字段，然后大概在其他地方读取公共静态属性。在您的代码中，公共静态属性完全独立于私有静态字段。
Try this:
尝试这个：
public class LoginDialog
{
// class members
public void RunDialog()
{
_User = "Peter";
}
public static string _User { get; private set; }
}
The property _Usercreates its own invisible private backing field, which is why it is entirely separate from the private _userfield you declared elsewhere.
该属性_User创建了自己不可见的私有支持字段，这就是为什么它与_user您在其他地方声明的私有字段完全分开的原因。
(Style guidelines dictate the name Userfor the public static property, but that's just a guideline.)
（样式指南规定了User公共静态属性的名称，但这只是一个指南。）
Here's another approach, for earlier versions of C# that do not support automatic properties, and without the underscore in the public property name:
这是另一种方法，适用于不支持自动属性且公共属性名称中没有下划线的早期版本的 C#：
public class LoginDialog
{
private static string _user;
// class members
public void RunDialog()
{
_user = "Peter";
}
public static string User { get { return _user; } }
}
