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Ich habe eine ASP.NET-Seite, die ich in VB schreibe, und ich versuche, das GridView nur anzuzeigen, wenn auf die Schaltfläche geklickt wird und die Produkt-ID angezeigt werden soll. Produktname, Lieferantenname und gekaufte Menge für alle vom Kunden gekauften Produkte (die aus der Dropdown-Liste stammen). Aus irgendeinem Grund, den ich nicht herausfinden kann, egal was ich mache, wird das GridView nicht angezeigt. Je. Jede Hilfe würde sehr geschätzt werden.GridView wird nicht angezeigt, wenn auf die Schaltfläche geklickt wird
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:NorthwindConnectionString %>" SelectCommand="SELECT [CompanyName] FROM [Customers] ORDER BY [CompanyName]"></asp:SqlDataSource>
<asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="<%$ ConnectionStrings:NorthwindConnectionString %>" SelectCommand="SELECT Customers_1.CustomerID, Customers_1.CompanyName, (SELECT COUNT(Orders.OrderID) AS Expr1 FROM Orders INNER JOIN Customers ON Orders.CustomerID = Customers.CustomerID WHERE (Customers.CompanyName = @p1)) AS [Number of Orders], SUM([Order Details].UnitPrice * [Order Details].Quantity - [Order Details].Discount) AS [Total Cost of Order] FROM Customers AS Customers_1 INNER JOIN Orders AS Orders_1 ON Customers_1.CustomerID = Orders_1.CustomerID INNER JOIN [Order Details] ON Orders_1.OrderID = [Order Details].OrderID WHERE (Customers_1.CompanyName = @p1) GROUP BY Customers_1.CustomerID, Customers_1.CompanyName">
<SelectParameters>
<asp:ControlParameter ControlID="DropDownList1" Name="p1" PropertyName="SelectedValue" />
</SelectParameters>
</asp:SqlDataSource>
<asp:SqlDataSource ID="SqlDataSource3" runat="server" ConnectionString="<%$ ConnectionStrings:NorthwindConnectionString %>" SelectCommand="SELECT Products.ProductID, Products.ProductName, Suppliers.CompanyName, [Order Details].Quantity FROM Orders INNER JOIN Customers ON Orders.CustomerID = Customers.CustomerID INNER JOIN [Order Details] ON Orders.OrderID = [Order Details].OrderID INNER JOIN Products ON [Order Details].ProductID = Products.ProductID INNER JOIN Suppliers ON Products.SupplierID = Suppliers.SupplierID WHERE (Customers.CustomerID = @p1)">
<SelectParameters>
<asp:ControlParameter ControlID="DropDownList1" Name="p1" PropertyName="SelectedValue" />
</SelectParameters>
</asp:SqlDataSource>
<br />
<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True" DataSourceID="SqlDataSource1" DataTextField="CompanyName" DataValueField="CompanyName">
<asp:ListItem>Select A Customer</asp:ListItem>
</asp:DropDownList>
<br />
<asp:DetailsView ID="DetailsView1" runat="server" AutoGenerateRows="False" BackColor="White" BorderColor="#CC9966" BorderStyle="None" BorderWidth="1px" CellPadding="4" DataKeyNames="CustomerID" DataSourceID="SqlDataSource2" Height="50px" Width="125px">
<EditRowStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="#663399" />
<Fields>
<asp:BoundField DataField="CustomerID" HeaderText="CustomerID" ReadOnly="True" SortExpression="CustomerID" />
<asp:BoundField DataField="CompanyName" HeaderText="CompanyName" SortExpression="CompanyName" />
<asp:BoundField DataField="Number of Orders" HeaderText="Number of Orders" ReadOnly="True" SortExpression="Number of Orders" />
<asp:BoundField DataField="Total Cost of Order" HeaderText="Total Cost of Order" ReadOnly="True" SortExpression="Total Cost of Order" />
</Fields>
<FooterStyle BackColor="#FFFFCC" ForeColor="#330099" />
<HeaderStyle BackColor="#990000" Font-Bold="True" ForeColor="#FFFFCC" />
<PagerStyle BackColor="#FFFFCC" ForeColor="#330099" HorizontalAlign="Center" />
<RowStyle BackColor="White" ForeColor="#330099" />
</asp:DetailsView>
<br />
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" BackColor="White" BorderColor="#CC9966" BorderStyle="None" BorderWidth="1px" CellPadding="4" DataKeyNames="ProductID" DataSourceID="SqlDataSource3" EmptyDataText="N/A" Visible="False">
<Columns>
<asp:BoundField DataField="ProductID" HeaderText="ProductID" InsertVisible="False" ReadOnly="True" SortExpression="ProductID" />
<asp:BoundField DataField="ProductName" HeaderText="ProductName" SortExpression="ProductName" />
<asp:BoundField DataField="CompanyName" HeaderText="CompanyName" SortExpression="CompanyName" />
<asp:BoundField DataField="Quantity" HeaderText="Quantity" SortExpression="Quantity" />
</Columns>
<FooterStyle BackColor="#FFFFCC" ForeColor="#330099" />
<HeaderStyle BackColor="#990000" Font-Bold="True" ForeColor="#FFFFCC" />
<PagerStyle BackColor="#FFFFCC" ForeColor="#330099" HorizontalAlign="Center" />
<RowStyle BackColor="White" ForeColor="#330099" />
<SelectedRowStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="#663399" />
<SortedAscendingCellStyle BackColor="#FEFCEB" />
<SortedAscendingHeaderStyle BackColor="#AF0101" />
<SortedDescendingCellStyle BackColor="#F6F0C0" />
<SortedDescendingHeaderStyle BackColor="#7E0000" />
</asp:GridView>
<br />
<asp:Button ID="Button1" runat="server" Text="Order Summary" />
</div>
</form>
</body>
</html>
Und mein Code-Behind-Seite sieht wie folgt aus:
Partial Class _Default
Inherits System.Web.UI.Page
Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
GridView1.Visible = True
GridView1.DataSourceID = "SqlDataSource3"
GridView1.
End Sub
End Class
Jede Hilfe wäre sehr
letzte Zeile sollte GridView1.DataBind() sein –
Vielen Dank! @DenisWessels – MicroBM
Ich habe als Antwort geschrieben.Bitte markieren Sie als beantwortet, wenn es Ihnen geholfen hat –