在登录表单上登录后-如何在另一个表单上显示该登录用户 [英] After logging in on login form -how to show that logged user on another form

问题描述

我有基于accdb数据库的Windows应用程序，其中有带有用户名和密码的表
使用正确的用户名和密码登录登录表单后，将打开另一个表单，我想在文本框中查看该登录用户的名称，还是必须是我不知道的文本框.

I have windows application based on accdb database in which I have table with usernames and passwords
After logging in on login form with proper username and password another form opens and I want to see in textbox the name of that logged user, or does it have to be textbox I dont'' know.

How to do this?

推荐答案

将用户名公开为登录"表单上的公共get-only属性.登录表单返回后，读出此字符串，然后将其传递给您的主表单(通过构造函数或通过类似的公共settable属性).

另外，如果您的应用程序具有用于保存全局状态数据的公共静态类，请将其存储在该属性中，以便您可以在整个应用程序中对其进行访问.

Expose the username as a public get-only property on the Login form. Once the login form returns, read out this string and then pass it to your main form (either via the constructor or via a similar public settable property).

Alternatively if your application has a public static class that you use to hold global state data, store it in a property there so you can access it throughout the app.

我会使用单例 [

I would use a Singleton [^]object. To do that, create a class like this:

public class User
{
   private static User instance;
   private User() {}
   public static User Instance
   {
      get
      {
         if (instance == null)
         {
            instance = new User();
         }
         return instance;
      }
   }
}

您甚至可以扩展此类，以对用户进行验证/认证/授权....
以简单的形式，我将分配此登录用户的值，以后再取回它.

You can even extend this class to do validation/authentication/authorization... of the user.
In the simple form, I would assign the value of this logged in user and later on retrieve it.

在应用程序中创建一个公共静态类，用于管理状态...

静态类-

Create a public static class in your application use that to manage state...

Static Class--

public static class GlobalState
{
  public static string LogedInUse
}

现在将您的登录按钮更改为

Now change your login button click as

void btnLogin_Click(object sender,EventArg e)
{
 if(ValidateLogin())
{
     GlobalState.LoggedInUser=txtUserName.Text;
}
else
{
// Show some message
}
}

希望对您有用.

--Pankaj

Hope it will usefull.

--Pankaj

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