asp.net gridview不显示数据

Question

protected void Button1_Click1(object sender, EventArgs e)
{
    SqlConnectionStringBuilder connb = new SqlConnectionStringBuilder(ConfigurationManager.ConnectionStrings["SCS"].ConnectionString);      
    using (SqlConnection conn = new SqlConnection(connb.ConnectionString))
    {
        SqlCommand cmd = new SqlCommand("Select * from dbo.Users;", conn);
        DataTable tb = new DataTable();

        SqlDataAdapter da = new SqlDataAdapter(cmd);

        da.Fill(tb);
        tb.AcceptChanges();
        GridView1.DataSource = tb;
        GridView1.DataBind();
     }
}

这是我在 C# asp.net 应用程序中的代码。我想在gridview中显示SQL表。

<Columns>
  <asp:BoundField ItemStyle-Width="150px" DataField="name" HeaderText="name" />
  <asp:BoundField ItemStyle-Width="150px" DataField="lastname" HeaderText="lastname" />
  <asp:BoundField ItemStyle-Width="150px" DataField="ID" HeaderText="ID" />
</Columns>

它显示空的网格视图（当我按下按钮1时）。它不显示任何错误消息。连接字符串有效，SQL 命令影响行，但它仍然没有在 gridview 上显示任何数据！

谁能帮我？

Answer 1

DataBind()您可能会在使用块时遇到异常try-catch。DataTable发生这种情况的原因可能是绑定字段中使用的列缺失。

 protected void Button1_Click1(object sender, EventArgs e)
 {

   SqlConnectionStringBuilder connb = new SqlConnectionStringBuilder(ConfigurationManager.ConnectionStrings["SCS"].ConnectionString);
   using (SqlConnection conn = new SqlConnection(connb.ConnectionString))
   {
    try
    {
      SqlCommand cmd = new SqlCommand("Select * from dbo.Users;", conn);
      DataTable tb = new DataTable();

      SqlDataAdapter da = new SqlDataAdapter(cmd);

      da.Fill(tb);
      tb.AcceptChanges();
      GridView1.DataSource = tb;
      GridView1.DataBind();
      GridView1.Rows[0].Cells[0].Text. = "a";
    }
    catch(Exception ex)
    {
         Response.Write(ex.Message);
    }     
   }           
}