My GridView не будет заполняться данными из моего SQL-источника данных

Question

Я создал GridView, привязанный к локальному файлу базы данных SQL (mdf). Соединение с базой данных выполнено успешно. Я получаю сообщение об ошибке из моего EmptyDataText = «Нет данных» на веб-странице, где должен быть GridView.

Любая помощь была бы принята с благодарностью.

Вот мой DIV держит GridView:

<div style="border: 10px hidden #0B4A80; height: 108px; width: 494px; overflow: auto; margin-bottom: 40px;" > 
    <asp:SqlDataSource runat="server" ID="SqlDataSource1" 
     ConnectionString='<%$ ConnectionStrings:DefaultConnection %>' 
     SelectCommand="SELECT AspNetUsers.EmailConfirmed, AspNetUser.UserName, AspNetUsers.FirstName, AspNetUsers.LastName, AspNetUsers.BusinessName, AspNetRoles.Name FROM AspNetUsers INNER JOIN AspNetRoles ON AspNetUsers.Id = AspNetRoles.Id INNER JOIN AspNetUserRoles ON AspNetUsers.Id = AspNetUserRoles.UserId AND AspNetRoles.Id = AspNetUserRoles.RoleId"></asp:SqlDataSource> 
    <asp:GridView ID="GridView2" runat="server" SelectMethod ="" UpdateMethod ="" AutoGenerateColumns="true" DataKeyNames="Id" EmptyDataText="No Data" EnableModelValidation="false" ForeColor="#333333" GridLines="None" BorderStyle="None" BorderWidth="10px" Height="75px" PageSize="3" Width="472px"> 
     <AlternatingRowStyle BackColor="White" ForeColor="#284775" /> 
     <Columns> 
     <asp:BoundField DataField="Text" HeaderText="User Information" /> 
     <asp:DynamicField DataField="EmailConfirmed" HeaderText="EmailConfirmed" SortExpression="EmailConfirmed"></asp:DynamicField> 
     <asp:BoundField DataField="FirstName" HeaderText="First Name" SortExpression="FirstName"></asp:BoundField> 
     <asp:BoundField DataField="LastName" HeaderText="Last Name" SortExpression="LastName"></asp:BoundField> 
     <asp:DynamicField DataField="BusinessName" HeaderText="Business Name" SortExpression="BusinessName"></asp:DynamicField> 
     <asp:DynamicField DataField="UserName" HeaderText="Email" SortExpression="UserName"></asp:DynamicField> 
     <asp:DynamicField DataField="Name" HeaderText="Role" SortExpression="Role" ></asp:DynamicField> 
     </Columns> 
     <EditRowStyle BackColor="#999999" /> 
     <FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" /> 
     <HeaderStyle BackColor="#D7E4FF" Font-Bold="True" ForeColor="#1484AA" /> 
     <PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" /> 
     <RowStyle BackColor="#F7F6F3" ForeColor="#333333" /> 
     <SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />   
    </asp:GridView> 
    </div> 

Вот мой код позади:

public partial class _Default : System.Web.UI.Page 
{ 
    protected void Page_Load(object sender, EventArgs e) 
    { 
    if (!IsPostBack) 
    { 
     BindGrid1(); 
     BindGrid2(); 
    } 

     private void BindGrid2() 
     { 
     String queryString = "SELECT [EmailConfirmed], [UserName], [FirstName], [LastName], [BusinessName], [Name] FROM AspNetUsers INNER JOIN AspNetRoles ON AspNetUsers.Id = AspNetRoles.Id INNER JOIN AspNetUserRoles ON AspNetUsers.Id = AspNetUserRoles.UserId AND AspNetRoles.Id = AspNetUserRoles.RoleId"; 
     DataSet ds = GetData(queryString); 
     if (ds.Tables.Count > 0) 
     { 
      GridView2.DataSource = ds; 
      GridView2.DataBind(); 
     } 
     else 
     { 
      Response.Write("Unable to conenct to the database"); 
     } 

     } 

     DataSet GetData(String queryString) 
     { 
     //Retrive the connection string in the web.config file. 
     String connectionString = ConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString; 

     DataSet ds = new DataSet(); 

     try 
     { 
      // Connect to the database and run query. 
      SqlConnection connection = new SqlConnection(connectionString); 
      SqlDataAdapter adapter = new SqlDataAdapter(queryString, connection); 

      //Fill the dataSet. 
      adapter.Fill(ds); 
     } 
     catch(System.Exception ex) 
     { 
      // The connection failed. Display an error message. 
      Response.Write("Unable to connect to the database."); 
      Response.Write(ex.Message); 
     } 
     return ds; 
     } 
    } 
} 

Answer 1

Пожалуйста, удалите код-за обращений к базе данных. Вы уже заполняете gridview из источника данных SQL-страницы ASPX.

ASPX:

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="Id" DataSourceID="SqlDataSource1"> 
    <Columns> 
     <asp:BoundField DataField="Id" HeaderText="Id" ReadOnly="True" SortExpression="Id" /> 
     <asp:BoundField DataField="Email" HeaderText="Email" SortExpression="Email" /> 
     <asp:CheckBoxField DataField="EmailConfirmed" HeaderText="EmailConfirmed" SortExpression="EmailConfirmed" /> 
     <asp:BoundField DataField="PasswordHash" HeaderText="PasswordHash" SortExpression="PasswordHash" /> 
     <asp:BoundField DataField="SecurityStamp" HeaderText="SecurityStamp" SortExpression="SecurityStamp" /> 
     <asp:BoundField DataField="PhoneNumber" HeaderText="PhoneNumber" SortExpression="PhoneNumber" /> 
     <asp:CheckBoxField DataField="PhoneNumberConfirmed" HeaderText="PhoneNumberConfirmed" SortExpression="PhoneNumberConfirmed" /> 
     <asp:CheckBoxField DataField="TwoFactorEnabled" HeaderText="TwoFactorEnabled" SortExpression="TwoFactorEnabled" /> 
     <asp:BoundField DataField="LockoutEndDateUtc" HeaderText="LockoutEndDateUtc" SortExpression="LockoutEndDateUtc" /> 
     <asp:CheckBoxField DataField="LockoutEnabled" HeaderText="LockoutEnabled" SortExpression="LockoutEnabled" /> 
     <asp:BoundField DataField="AccessFailedCount" HeaderText="AccessFailedCount" SortExpression="AccessFailedCount" /> 
     <asp:BoundField DataField="UserName" HeaderText="UserName" SortExpression="UserName" /> 
     <asp:BoundField DataField="TrialExpiration" HeaderText="TrialExpiration" SortExpression="TrialExpiration" /> 
     <asp:BoundField DataField="Name" HeaderText="Name" SortExpression="Name" /> 
    </Columns> 
</asp:GridView> 

<asp:SqlDataSource runat="server" ID="SqlDataSource1" 
ConnectionString='......' SelectCommand="SELECT AspNetUsers.EmailConfirmed, AspNetUser.UserName, AspNetUsers.FirstName, AspNetUsers.LastName, AspNetUsers.BusinessName, AspNetRoles.Name FROM AspNetUsers LEFT OUTER JOIN AspNetUserRoles ON AspNetUsers.Id = AspNetUserRoles.UserId LEFT OUTER JOIN AspNetRoles ON AspNetRoles.Id = AspNetUserRoles.RoleId"></asp:SqlDataSource> 

C# кода:

public partial class _Default : Page 
{ 
    protected void Page_Load(object sender, EventArgs e) 
    { 
     if (!IsPostBack) 
     { 
     } 
    } 
} 

Answer 2

Вы забыли открыть соединение?

using(SqlConnection connection = new SqlConnection(connectionString)) 
{ 
     connection.Open(); 
     SqlDataAdapter adapter = new SqlDataAdapter(queryString, connection); 

     //Fill the dataSet. 
     adapter.Fill(ds); 
}