How to retrieve a TextBox from DetailsView - ASP.NET

问题

I have a DetailsView Control, inside as a template a TextBox. I need to find out the value for a TextBox when Inserting data Event handler-, _ItemInserting.

The script does not work. Ant ideas?? Thanks

-------------------- WEB FORM

<asp:TemplateField HeaderText="Profile" SortExpression="ContentAuthor">
                <ItemTemplate>
                    <asp:Label ID="uxContentAuthorDisplayer" runat="server" Text='<%# Bind("ContentAuthor") %>'></asp:Label>
                </ItemTemplate>
                <InsertItemTemplate>
                    <asp:TextBox ID="uxContentAuthorInput" runat="server" Text='<%# Bind("ContentAuthor") %>'></asp:TextBox>
                </InsertItemTemplate>
            </asp:TemplateField>

-------------------- CODE BEHIND

          protected void uxInsertAuthor_ItemInserting(object sender, DetailsViewInsertEventArgs e)
        {
            //// Find control on page
            TextBox myAuthorProfile = (TextBox)uxInsertAuthorInput.FindControl("uxContentAuthorDisplayer");
            // Set a default value in Data Base if field has been left empty (DB field NOT NULL)           
            if (string.IsNullOrEmpty(myAuthorProfile.Text))
            {
                string myAllert = "Field is NULL";
            }
            else
            {
                string myAllet = "Field is NOT NULL";
            }          
        }

回答1:

Try using the FindControl method of your TemplateField container control (the DetailsView). For example, if your DetailsView is named "MyControl" try

//// Find control on page
TextBox myAuthorProfile = (TextBox)MyControl.FindControl("uxContentAuthorInput");

Please Note

You are using the ID of the Label control in your FindControl method and you are trying to cast it to a TextBox.

回答2:

Another option is to get the value from the DetailsViewInsertEventArgs. It has a property called Values which is a dictionary with all the bound values that will go into the database from the DetailsView. So you could do the following instead:

if (string.IsNullOrEmpty(e.Values("ContentAuthor")))
{
  string myAlert = "Field is NULL";
}
else
{
  string myAlert = "Field is NOT NULL";
}

回答3:

If I understood it correctly, you want to check the value of the TextBox when the data is put into the DetailsView. The ItemInserting event is not the one you're looking for:

http://msdn.microsoft.com/en-us/library/keezbt7k.aspx

I'd say ItemCreated is the one you're looking for.

来源：https://stackoverflow.com/questions/4132795/how-to-retrieve-a-textbox-from-detailsview-asp-net

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