from1包含变量"Admin_id"； n当我编码form1 f1 = new form1()时，它变为null.为什么? [英] from1 contains a variable "Admin_id" n it becomes null when i code form1 f1 = new form1(); why?

问题描述

from1包含一个变量"Admin_id" n我这样声明它

from1 contains a variable "Admin_id" n i declare it like this

private string admin_id;
public string Admin_id
{
     get { return admin_id; }
     set { admin_id = value; }
} 

当我为

it becomes null when i code

form1 f1 = new form1();

编写代码时，它变为空吗?

我将其写在Administration类中以访问form1变量(admin_id)n的值以访问我的代码

why?

i write this in Administration class to access value of form1 variable (admin_id) n to access i code

string d_id = f1.Admin_id;

推荐答案

Admin_id是form1上的公共变量，因此当您创建表单的新实例时，将自动重新初始化所有变量

Admin_id is a public variable on the form1, so whenevr you create a new instance of the form then automatically all the variables are reinitialized

用于公共类型变量，使用类并定义如下:-

for Public type variables use class and define like this :-

public static string Admin_id;

用途:

uses :

string ID=classname.Admin_id;

替换

replace

admin_id. = A_TB1.Text;

与此:

with this:

string admin_id = A_TB1.Text;

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