Question

我需要从我的users表中选择具有我必须从下拉列表中获取的roleID的用户的用户名。数据未出现在GridView中。看不出有什么不对，请帮帮我。已经尝试了两种方式

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
   {
       SqlConnection con = new SqlConnection(cs);
       con.Open();
       SqlCommand cmd = new SqlCommand("select username from tblUser where roleID like '" + DropDownList1.SelectedValue + "'", con);

       SqlDataAdapter da = new SqlDataAdapter(cmd);
       DataTable dt = new DataTable();
       da.Fill(dt);
       GridView2.DataSource = dt;
       GridView2.DataBind();
       con.Close();
   }

protected void Button2_Click(object sender, EventArgs e)
{
    SqlConnection con = new SqlConnection(cs);
    con.Open();
    SqlCommand cmd = new SqlCommand("select username from tblUser where roleID like '" + DropDownList1.SelectedValue + "'", con);

    SqlDataReader reader = cmd.ExecuteReader();

    GridView2.DataSource = reader;
    GridView2.DataBind();
    con.Close();
}

Answer 1

好的，所以这个对我有用。而且你还必须检查来源。就像我的GridView发生的那样，它说AutoGenerateColumns = false，我删除了它。这一切都奏效了！

protected void Button2_Click(object sender, EventArgs e)
{
    string cs = ConfigurationManager.ConnectionStrings["roleDB"].ConnectionString;
    SqlConnection con = new SqlConnection(cs);
    con.Open();
    SqlCommand cmd = con.CreateCommand();
    cmd.CommandType = CommandType.Text;
    cmd.CommandText = "select username from tblUser where roleID like '" + DropDownList1.SelectedValue + "'";
    SqlDataAdapter da = new SqlDataAdapter(cmd);
    DataTable dt = new DataTable();
    da.Fill(dt);
    GridView2.DataSource = dt;
    GridView2.DataBind();
    con.Close();
}

使用sql数据填充GridView

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