ASP.NET GridView GridViewDeleteEventArgs.Keys empty
I have the following Gridview:
<asp:GridView ID="GridView1" runat="server" CssClass="table" DataKeyNames="groupId"
DataSource="<%# dsUserGroupsSelected %>" DataMember="Group" etc....>
and after running the RowDeleting event handler:
protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
e.Keys is empty. Moreover, at runtime, if I check
dsUserGroupsSelected.Group.PrimaryKey
it is called with:
{System.Data.DataColumn[1]}
[0]: {groupId}
so this is really strange to me. Am I missing something? I have a workaround like this:
int groupId = (int)GridView1.DataKeys[e.RowIndex].Value;
which will work fine, but I just can't figure out why e.Keys (and e.Values) would be empty !? Any ideas?
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It looks like this behavior is intentional.
From http://forums.asp.net/p/1050092/2128091.aspx
Looking at the reflector at the Gridview.HandleDelete () it seems that e.Keys and e.Values only get populated if gridview.IsBoundUsingDataSourceID. That is, if you set the DataSource in code, then none of this will work. Good Microsoft! It should have been helpful to mention that it is possible to help ?? !! Lachlan
Edit:
I ended up creating my own data objects and put them in the app_code folder
ex.
public class CustomDataViews
{
public class FileQuery
{
public class File
{
public DateTime CreatedDate { get; set; }
public string FileName { get; set; }
public string Path { get; set; }
public void Delete() { }
}
public ArrayList GetFiles()
{
System.Collections.ArrayList files = new ArrayList();
System.IO.DirectoryInfo di = new System.IO.DirectoryInfo(HttpContext.Current.Server.MapPath("~/UserUpload/"));
foreach (System.IO.FileInfo fi in (from a in di.GetFiles() orderby a.CreationTime descending select a))
{
File myFile = new File();
myFile.CreatedDate = fi.CreationTime;
myFile.FileName = fi.Name;
myFile.Path = "/VACWeb/UserUpload/" + fi.Name;
files.Add(myFile);
}
return files;
}
public void Delete(string FileName)
{
if (FileName != null)
{
string path = HttpContext.Current.Server.MapPath("~/UserUpload/") + FileName;
if (System.IO.File.Exists(path))
System.IO.File.Delete(path);
}
}
}
}
ASPX
<asp:GridView ID="gvFiles" runat="server" AutoGenerateColumns="False" DataKeyNames="FileName"
DataSourceID="ods1">
<Columns>
<cc:ExtendedCommandField DeleteConfirmationText="Are you sure you wish to delete this file?"
DeleteText="Delete" ShowDeleteButton="true" />
<asp:BoundField DataField="CreatedDate" HeaderText="Created Date" DataFormatString="{0:MM/dd/yyyy}" />
<asp:BoundField DataField="FileName" HeaderText="File Name" />
<asp:ImageField DataImageUrlField="Path" AlternateText="No Image" HeaderText="Image Preview"
ControlStyle-Width="100px">
<ControlStyle Width="100px" />
</asp:ImageField>
<asp:BoundField DataField="Path" HeaderText="Path" />
<asp:HyperLinkField DataNavigateUrlFields="Path" DataTextField="FileName" HeaderText="Link" />
</Columns>
</asp:GridView>
<asp:ObjectDataSource ID="ods1" runat="server" DeleteMethod="Delete" SelectMethod="GetFiles"
TypeName="CustomDataViews+FileQuery">
<DeleteParameters>
<asp:Parameter Name="FileName" Type="String" />
</DeleteParameters>
</asp:ObjectDataSource>
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Simple! ASP is a big chunk .... and GridView is a small chunk in the big world. You have the same problem, and while the workaround is fine for deletion, the update becomes really interesting ... The actual problem is that for some good or obvious reason the looooooooot functionality of the GridView is missing unless the DataSource is a DataSourceControl: How to populate key properties and values in eventargs. Enjoy! Viva Microsoft!
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Apparently the GridViewDeleteEventArgs.Keys property only works if you have set the DataSource GridView by setting the DataSourceID property , that is, setting the DataSource property and then manually calling DataBind () leaves the Keys property (and the Values property as well) blank.
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