我有登录表单和主表单，登录是用户时如何使按钮启用= false？ [英] I have login form and main form , how I make button enable = false when the login is user?

问题描述

form1是loginform，而form2有按钮我想让这个按钮启用false ...



这是登录表格中的代码： -



s =从User_name ='+ txt_UserName.Text +'和Password ='+ txt_Password.Text +'和Role ='User'的用户中选择Role_id;

sdAdapter = new SqlDataAdapter（s，con）;

dt = new DataTable（）;

sdAdapter.Fill（dt）;

if（dt.Rows.Count == 1）

{

string s2 =insert into LoginAndOutDate（user_name，Login_Date）;

s2 = s2 +values（@ user_name，CURRENT_TIMESTAMP）;



if（con.State == ConnectionState.Closed）

con.Open（）;



使用（sCommand = new SqlCommand（s2，con））

{

sCommand.Parameters.AddWithValue（@ user_name，txt_UserName.Text）;

sCommand.ExecuteNonQuery（）;

}



if（con.State == ConnectionState.Open）

con.Close（）;



这个。隐藏（）;

FRM_Main frm = new FRM_Main（txt_UserName.Text）;

frm.RefToFormLogin = this;

frm.Show（） ;

txt_Password.Clear（）;



我尝试过：



如何使用另一种形式启用按钮= false

form1 is loginform, and form2 has button i want make this button is enabled false...

This is Code in login form:-

s = "select Role_id from Users where User_name = '" + txt_UserName.Text + "' and Password = '" + txt_Password.Text + "' and Role = 'User' ";
sdAdapter = new SqlDataAdapter(s, con);
dt = new DataTable();
sdAdapter.Fill(dt);
if (dt.Rows.Count == 1)
{
string s2 = " insert into LoginAndOutDate(user_name, Login_Date) ";
s2 = s2 + " values(@user_name, CURRENT_TIMESTAMP) ";

if (con.State == ConnectionState.Closed)
con.Open();

using (sCommand = new SqlCommand(s2, con))
{
sCommand.Parameters.AddWithValue("@user_name", txt_UserName.Text);
sCommand.ExecuteNonQuery();
}

if (con.State == ConnectionState.Open)
con.Close();

this.Hide();
FRM_Main frm = new FRM_Main(txt_UserName.Text);
frm.RefToFormLogin = this;
frm.Show();
txt_Password.Clear();

What I have tried:

How i make button is enabled = false from another form

推荐答案

最简单的方法是在表单构造函数中添加第二个参数：

Easiest way is to add a second parameter to your form constructor:

public FRM_Main(string userName, bool enableMyButton)
   {
   InitializeComponent();
   ...
   myButton.Enabled = enableMyButton;
   }

然后在构造表单实例时传递适当的值。

And then pass the appropriate value when you construct the form instance.

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