可能重复：
使用属性在两个表单之间传递数据
我正在使用以下代码来验证 winform 应用程序的登录。
public int Validate_Login(String Username, String Password)
{
//SqlConnection con = new SqlConnection(@"User id=judgment_day;Password=Kit$hen;Server=216.40.232.82, 2153;Database=new_judgment-system");
SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["rawr"].ConnectionString);
SqlCommand cmdselect = new SqlCommand();
cmdselect.CommandType = CommandType.StoredProcedure;
cmdselect.CommandText = "[dbo].[prcLoginv]";
cmdselect.Parameters.Add("@Username", SqlDbType.VarChar, 50).Value = Username;
cmdselect.Parameters.Add("@UPassword", SqlDbType.VarChar, 50).Value = Password;
cmdselect.Parameters.Add("@OutRes", SqlDbType.Int, 4);
cmdselect.Parameters["@OutRes"].Direction = ParameterDirection.Output;
cmdselect.Connection = con;
int Results = 0;
try
{
con.Open();
cmdselect.ExecuteNonQuery();
Results = (int)cmdselect.Parameters["@OutRes"].Value;
}
catch (SqlException ex)
{
lblMessage.Text = ex.Message;
}
finally
{
cmdselect.Dispose();
if (con != null)
{
con.Close();
}
}
return Results;
}
protected void btnlogin_Click(object sender, EventArgs e)
{
int Results = 0;
if (txtUsername.Text != null && txtPassword.Text != null)
{
Results = Validate_Login(txtUsername.Text, txtPassword.Text);
if (Results == 1)
{
lblMessage.Text = "Login is Good";
this.Hide();
frmSwitch frm = new frmSwitch();
frm.Show();
}
else
{
lblMessage.Text = "Invalid Login";
lblMessage.ForeColor = System.Drawing.Color.Red;
}
}
else
{
lblMessage.Text = "Please make sure that the username and the password is Correct";
}
}
SP如下：
Create Proc [dbo].[prcLoginv]
(
@Username VarChar(50),
@UPassword varChar(50),
@OutRes int OUTPUT
)
AS
set @OutRes = (SELECT count(*) FROM [dbo].Log_Users
WHERE Username = @Username And [Password] = @UPassword)
if(@OutRes = 1)
begin
set @OutRes = 1--Login is Correct
end
else
begin
set @OutRes = 0 --Bad login
end
我将如何修改它以返回用户 ID，以便我可以将其传递给另一个表单。我需要使用该 ID 来显示谁在处理什么文件。