找到具有相同ID"lblCustomerID"的多个控件. FindControl要求控件具有唯一的ID. [英] Multiple controls with the same ID 'lblCustomerID' were found. FindControl requires that controls have unique IDs.

问题描述

前端代码

front end code

<asp:TemplateField HeaderText="CustomerID" >
           <ItemTemplate>
           <asp:Label runat="server" ID="lblCustomerID" Text='<%# Eval("CustomerID") %>'></asp:Label>
           </ItemTemplate>
           <EditItemTemplate>
           <asp:TextBox runat="server" ID="TxtCustomerID" Text='<%# Eval("CustomerID") %>'></asp:TextBox>
           </EditItemTemplate>
           </asp:TemplateField>

           <asp:TemplateField HeaderText="Name" >
           <ItemTemplate><asp:Label runat="server" ID="lblCustomerID" Text='<%# Eval("Name") %>'></asp:Label></ItemTemplate>
           <EditItemTemplate>
           <asp:TextBox runat="server" ID="txtName" Text='<%# Eval("Name") %>'></asp:TextBox></EditItemTemplate>
           </asp:TemplateField>


            <asp:TemplateField HeaderText="Company" >
           <ItemTemplate><asp:Label runat="server" ID="lblCustomerID" Text='<%# Eval("Company") %>'></asp:Label></ItemTemplate>
           <EditItemTemplate>
           <asp:TextBox runat="server" ID="txtCompany" Text='<%# Eval("Company") %>'></asp:TextBox>
           </EditItemTemplate>

           </asp:TemplateField>

后端代码

Backend code

Protected Sub GridView1_RowUpdating(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewUpdateEventArgs) Handles GridView1.RowUpdating

    Dim CustomerID As String = DirectCast(GridView1.Rows(e.RowIndex).FindControl("txtCustomerID"), TextBox).Text

    Dim Name As String = DirectCast(GridView1.Rows(e.RowIndex).FindControl("txtName"), TextBox).Text
    Dim Company As String = DirectCast(GridView1.Rows(e.RowIndex).FindControl("txtCompany"), TextBox).Text

    Dim con As New SqlConnection(ConfigurationManager.ConnectionStrings("connectionstring").ConnectionString)
    con.Open()
    Dim update As String = "update customer set Name=@Name,Company=@Company where CustomerID=@CustomerID" & " select * from customer"

    Dim com As New SqlCommand(update, con)
    com.Parameters.AddWithValue("@Name", Name)
    com.Parameters.AddWithValue("@Company", Company)

    com.Parameters.AddWithValue("@CustomerID", CustomerID)



    Dim adp As SqlDataAdapter = New SqlDataAdapter(com)

    Dim dt As New DataTable
    adp.Fill(dt)




    adp.UpdateCommand.Parameters.AddWithValue("@Name", Name)
    adp.UpdateCommand.Parameters.AddWithValue("@Company", Company)
    adp.UpdateCommand.Parameters.AddWithValue("@CustomerID", CustomerID)
    GridView1.EditIndex = -1
    con.Close()
    BindData()



End Sub

Protected Sub GridView1_RowDeleting(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewDeleteEventArgs) Handles GridView1.RowDeleting
    Dim con As New SqlConnection(ConfigurationManager.ConnectionStrings("connectionstring").ConnectionString)

    Dim CustomerID As String = DirectCast(GridView1.Rows(e.RowIndex).FindControl("lblCustomerID")TextBox).Text

    con.Open()
    Dim delete As String = "delete from Customer where CustomerID=@CustomerID " & "select * from Customer "
    Dim cmd As New SqlCommand(delete, con)
    cmd.Parameters.AddWithValue("@CustomerID", CustomerID)
    con.Close()

End Sub

在删除Gridview时遇到错误，我突出显示并加了下划线，提示我出现错误

Getting an error in Gridview deleting i have highlighted and underlined where i m getting an error

推荐答案

也许您应该重命名这些ID

Maybe you should rename these IDs

<asp:TemplateField HeaderText="Name" >
<ItemTemplate><asp:Label runat="server" ID="lblCustomerID" Text='<%# Eval("Name") %>'></asp:Label></ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" ID="txtName" Text='<%# Eval("Name") %>'></asp:TextBox></EditItemTemplate>
</asp:TemplateField>


 <asp:TemplateField HeaderText="Company" >
<ItemTemplate><asp:Label runat="server" ID="lblCustomerID" Text='<%# Eval("Company") %>'></asp:Label></ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" ID="txtCompany" Text='<%# Eval("Company") %>'></asp:TextBox>
</EditItemTemplate>

变成类似lblName或lblCompany

into something unique like lblName or lblCompany

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