Ошибка ASP.NET: необходимо объявить скалярную переменную
Я знаю, что явно отсутствует / неправильно объявил переменную, но я не совсем уверен, как это исправить. Я получаю эту ошибку, когда я нажимаю "btnUpdate", чтобы обновить информацию в базе данных (в зависимости от того, что находится в текстовых полях). Я разместил код ниже для обзора, спасибо за помощь!
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebApplication1.WebForm1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<div class="floater">
<h3>Books</h3>
<asp:DropDownList
id="DropDownList_Books"
DataSourceId="srcBooks"
DataTextField="Title"
DataValueField="Id"
Runat="server" />
<asp:Button ID="btnSelect" runat="server" Text="View Detials" Width="106px"
onclick="btnSelect_Click" />
</div>
<asp:GridView
id="grdBooks"
DataSourceID="srcBooks_Description"
Runat="server" Visible="False" />
<asp:Button ID="btnEdit" runat="server" onclick="btnEdit_Click" Text="Edit" />
</div>
<asp:Button ID="btnCancel" runat="server" onclick="btnCancel_Click"
style="z-index: 1; left: 464px; top: 153px; position: absolute; height: 26px"
Text="Cancel" Visible="False" />
<asp:FormView
id="frmEditBook"
DataKeyNames="Cat_Id"
DataSourceId="srcBooks_Description"
DefaultMode="Edit"
Runat="server" Visible="False"
style="z-index: 1; left: 391px; top: 87px; position: absolute; height: 111px; width: 206px">
<EditItemTemplate>
<asp:Label
id="lblTitle"
Text="Title:"
AssociatedControlID="txtTitle"
Runat="server" />
<asp:TextBox
id="txtTitle"
Text='<%#Bind("Title")%>'
Runat="server" />
<br />
<asp:Label
id="lblDescription"
Text="Description:"
AssociatedControlID="txtDescription"
Runat="server" />
<asp:TextBox
id="txtDescription"
Text='<%#Bind("Description")%>'
Runat="server" />
<br />
<asp:Button
id="btnUpdate"
Text="Update"
CommandName="Update"
Runat="server" />
</EditItemTemplate>
</asp:FormView>
<asp:SqlDataSource ID="srcBooks" runat="server"
ConnectionString="Data Source="ebiz.isy.vcu.edu, 14330";Initial Catalog=spring12u08;Persist Security Info=True;User ID=Spring12u08;Password=INFO451u08"
onselecting="srcBooks_Selecting" ProviderName="System.Data.SqlClient" SelectCommand="SELECT Title,Id FROM PARTIN_ID">
</asp:SqlDataSource>
<asp:SqlDataSource ID="srcBooks_Description" runat="server"
ConnectionString="Data Source="ebiz.isy.vcu.edu, 14330";Initial Catalog=spring12u08;Persist Security Info=True;User ID=Spring12u08;Password=INFO451u08"
onselecting="srcBooks_Selecting" ProviderName="System.Data.SqlClient" SelectCommand="SELECT * FROM PARTIN_INFO WHERE Cat_ID=@Id" UpdateCommand="UPDATE PARTIN_INFO SET Title=@Title,
Description=@Description WHERE Cat_Id=@Id">
<SelectParameters>
<asp:ControlParameter
Name="Id"
Type="int32"
ControlID="DropDownList_Books" />
</SelectParameters>
</asp:SqlDataSource>
</form>
</body>
</html>
Обновлен код с новой ошибкой: не удалось найти элемент управления 'txtTitle' в ControlParameter 'Title'.
<form id="form1" runat="server">
<div>
<div class="floater">
<h3>Books</h3>
<asp:DropDownList
id="DropDownList_Books"
DataSourceId="srcBooks"
DataTextField="Title"
DataValueField="Id"
Runat="server" />
<asp:Button ID="btnSelect" runat="server" Text="View Detials" Width="106px"
onclick="btnSelect_Click" />
</div>
<asp:GridView
id="grdBooks"
DataSourceID="srcBooks_Description"
Runat="server" Visible="False" />
<asp:Button ID="btnEdit" runat="server" onclick="btnEdit_Click" Text="Edit" />
</div>
<asp:Button ID="btnCancel" runat="server" onclick="btnCancel_Click"
style="z-index: 1; left: 464px; top: 153px; position: absolute; height: 26px"
Text="Cancel" Visible="False" />
<asp:FormView
id="frmEditBook"
DataKeyNames="Cat_Id"
DataSourceId="srcBooks_Description"
DefaultMode="Edit"
Runat="server" Visible="False"
style="z-index: 1; left: 391px; top: 87px; position: absolute; height: 111px; width: 206px" >
<EditItemTemplate>
<asp:Label
id="lblTitle"
Text="Title:"
AssociatedControlID="txtTitle"
Runat="server" />
<asp:TextBox
id="txtTitle"
Text='<%#Bind("Title")%>'
Runat="server" />
<br />
<asp:Label
id="lblDescription"
Text="Description:"
AssociatedControlID="txtDescription"
Runat="server" />
<asp:TextBox
id="txtDescription"
Text='<%#Bind("Description")%>'
Runat="server" />
<br />
<asp:Button
id="btnUpdate"
Text="Update"
CommandName="Update"
Runat="server" />
</EditItemTemplate>
</asp:FormView>
<asp:SqlDataSource ID="srcBooks" runat="server"
ConnectionString="Data Source="ebiz.isy.vcu.edu, 14330";Initial Catalog=spring12u08;Persist Security Info=True;User ID=Spring12u08;Password=INFO451u08"
onselecting="srcBooks_Selecting" ProviderName="System.Data.SqlClient" SelectCommand="SELECT Title,Id FROM PARTIN_ID">
</asp:SqlDataSource>
<asp:SqlDataSource ID="srcBooks_Description" runat="server"
ConnectionString="Data Source="ebiz.isy.vcu.edu, 14330";Initial Catalog=spring12u08;Persist Security Info=True;User ID=Spring12u08;Password=INFO451u08"
onselecting="srcBooks_Selecting" ProviderName="System.Data.SqlClient" SelectCommand="SELECT * FROM PARTIN_INFO WHERE Cat_ID=@Id" UpdateCommand="UPDATE PARTIN_INFO SET Title=@Title,
Description=@Description WHERE Cat_Id=@Id">
<SelectParameters>
<asp:ControlParameter
Name="Id"
Type="int32"
ControlID="DropDownList_Books"
PropertyName="SelectedValue" />
</SelectParameters>
<UpdateParameters>
<asp:ControlParameter Name="Title" ControlId="txtTitle" PropertyName="Text"/>
<asp:ControlParameter Name="Description" ControlId="txtDescription" PropertyName="Text"/>
<asp:ControlParameter Name="Id" ControlId="DropDownList_Books" PropertyName="SelectedValue"/>
</UpdateParameters>
</asp:SqlDataSource>
</form>
Также код позади:
namespace WebApplication1
{
public partial class WebForm1 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void srcBooks_Selecting(object sender, SqlDataSourceSelectingEventArgs e)
{
}
protected void btnSelect_Click(object sender, EventArgs e)
{
grdBooks.Visible = true;
}
protected void btnCancel_Click(object sender, EventArgs e)
{
frmEditBook.Visible = false;
}
protected void btnEdit_Click(object sender, EventArgs e)
{
frmEditBook.Visible = true;
btnCancel.Visible = true;
}
protected void btnUpdate_Click(object sender, EventArgs e)
{
try
{
srcBooks_Description.Update();
}
catch (Exception except)
{
// Handle the Exception.
}
}
}
}
1 ответ
У меня была эта проблема. Я изменил все имена полей в исходной таблице на одно слово или несколько слов, разделенных подчеркиванием, например card_number, изменил операторы выбора и обновления, и он работал нормально.