Question

没有错误显示！它没有运作！

我需要在登录＆＃34; Stock_Controller＆＃34;时隐藏此UserType的UserID列。并将其显示为＆＃34;管理员＆＃34;。

我有一个带有项目列的网格视图，如下所示：

ID|Stock_Type|Stock_No|No_of_pieces|Gem_Type|Weight|Image|Cost|Create_Date|Update_date|UserID|

这是我的登录代码：

try
{
    SqlCommand selectCommand = new SqlCommand(" Select * from New_User where User_Name=@USER_ID and Password=@PASS", conn);
    selectCommand.Parameters.Add(new SqlParameter("USER_ID", txtusername.Text.ToString()));
    String password = "";

    using (SHA1 sha1 = SHA1.Create())
    {
        // sha1.Initialize();
        byte[] data = sha1.ComputeHash(Encoding.UTF8.GetBytes(txtpassword.Text));

        StringBuilder sb = new StringBuilder();

        for (int i = 0; i < data.Length; ++i)
        {
            sb.Append(data[i].ToString("x2"));
        }

        password = sb.ToString();
    }

    selectCommand.Parameters.Add(new SqlParameter("PASS", password));
    string UserType = null;

    SqlDataReader reader = selectCommand.ExecuteReader();
    bool rowfound = reader.HasRows;

    if (rowfound)
    {
        while (reader.Read())
        {
            UserType = reader["User_Type"].ToString().Trim();

            if (UserType == "Administrator") 
            {
                GlobalVariablesClass.VariableOne = txtusername.Text;
                MessageBox.Show("Welcome ", "Admin Login", MessageBoxButtons.OK, MessageBoxIcon.Information);

                Admin_Menu frm = new Admin_Menu();
                frm.bunifuFlatButton3.Visible = true;
                frm.Show();

                Stocks_Gems sg = new Stocks_Gems(); /*this is the UserControl: which has the grid-view*/ 
                sg.dataGridView1.Columns[10].Visible = true;  /*i have selected the 10th column which needed to be Visibile*/
                sg.Show();

                this.Hide();
            }
            else if (UserType == "StockController")
            {
                GlobalVariablesClass.VariableOne = txtusername.Text;
                MessageBox.Show("Welcome ", "User Login", MessageBoxButtons.OK, MessageBoxIcon.Information);

                Admin_Menu frm = new Admin_Menu();
                frm.bunifuFlatButton3.Visible = false;
                frm.Show();

                Stocks_Gems sg = new Stocks_Gems(); /*this is the UserControl: which has the grid-view*/ 
                sg.dataGridView1.Columns[10].Visible = false;  /*i have selected the 10th column which needed to be Hidden*/
                sg.Show();

                this.Hide();
            }
        }
    }
    else
    {
        MessageBox.Show(" Invalid User Or Password ", "Login ", MessageBoxButtons.OK, MessageBoxIcon.Error);
    }

    reader.Close();
}

登录过程用户登录＆gt;然后打开主菜单表格＆gt;然后点击按钮STOCK DETAILS＆gt; （在右侧网格视图上）是一个USercontrol打开。但它不影响专栏。请帮助!!

Answer 1

如果UserType既不是Administrator也不是StockController，那么显示/隐藏列的代码将无法运行，列将保持当前状态，这是最可能Visible=true。

假设上述问题不是您的问题，并且保证用户为Administrator或StockController，您可能会发现dataGridView1的列是自动生成的。对于自动生成的列，除DataBindingComplete event外，Visible属性不起作用。请参阅remarks for the Visible Property：

要隐藏绑定到数据源时自动生成的列，请在DataBindingComplete事件处理程序中设置此属性。

这会使代码工作变得有点复杂。如果将DataGridView.AutoGenerateColumns设置为false并手动指定所有列，则会容易得多。然后你的代码将无需更改即可运行。

如何在c＃中为不同的用户角色隐藏网格视图列

1 个答案: