Getting the value of an edited item in a Telerik RadGrid - asp.net

Question

ASPX:
<telerik:RadGrid ID="ctlItemsGrid" runat="server" DataKeyNames="Id" AllowPaging="true" AllowSorting="true" GridLines="None" Skin="Windows7" EnableViewState="true">
<MasterTableView AutoGenerateColumns="false" AllowPaging="true" DataKeyNames="Id,WorkflowStatus" NoMasterRecordsText="No items exist in the database." EnableViewState="true">
<SortExpressions>
<telerik:GridSortExpression FieldName="Id" SortOrder="Descending" />
</SortExpressions>
<PagerStyle Mode="NextPrevAndNumeric" />
<Columns>
<telerik:GridNumericColumn ColumnEditorID="ctlColumnId" HeaderText="ID" DataField="Id" DecimalDigits="0" DataType="System.Int32" NumericType="Number" ReadOnly="true"></telerik:GridNumericColumn>
<telerik:GridDropDownColumn UniqueName="ctlColumnGridWorkflow" ColumnEditorID="ctlColumnWorkflow" HeaderText="Workflow" DataField="WorkflowStatus" DropDownControlType="DropDownList"></telerik:GridDropDownColumn>
<telerik:GridEditCommandColumn UniqueName="ctlColumnGridEdit" CancelText="Cancel" EditText="Edit"></telerik:GridEditCommandColumn>
<telerik:GridButtonColumn UniqueName="ctlColumnGridDelete" CommandName="Delete" CommandArgument="" Text="Remove"></telerik:GridButtonColumn>
</Columns>
</MasterTableView>
</telerik:RadGrid>
C#:
public partial class administration_modules_item_Default : ViewPageBase<IItemAdminPresenter, IItemAdminView>, IItemAdminView
{
private IEnumerable<WorkflowStatus> _workflowStatuses;
private IEnumerable<IItemDbItem> _items;
protected override void PreloadView()
{
this.ctlItemsGrid.ItemDataBound += new Telerik.Web.UI.GridItemEventHandler(ctlItemsGrid_ItemDataBound);
this.ctlItemsGrid.ItemCommand += new GridCommandEventHandler(ctlItemsGrid_ItemCommand);
//this.ctlItemsGrid.ItemUpdated += new GridUpdatedEventHandler(ctlItemsGrid_ItemUpdated);
this.ctlItemsGrid.UpdateCommand += new GridCommandEventHandler(ctlItemsGrid_UpdateCommand);
}
protected override void PostLoadView()
{
// Doesn't work, values are all empty strings
//foreach (GridEditableItem editItem in ctlItemsGrid.EditItems)
//{
// Dictionary<string, string> newValues = new Dictionary<string, string>();
// ctlItemsGrid.MasterTableView.ExtractValuesFromItem(newValues, editItem);
// IItemDbItem w = (IItemDbItem)editItem.DataItem;
// if (!string.IsNullOrWhiteSpace(newValues["WorkflowStatus"]))
// {
// w.WorkflowStatus = (WorkflowStatus)Enum.Parse(typeof(WorkflowStatus), newValues["WorkflowStatus"]);
// this.Presenter.Update(w.Id, w.WorkflowStatus);
// }
//}
ctlItemsGrid.DataSource = _items;
ctlItemsGrid.DataBind();
base.PostLoadView();
}
void ctlItemsGrid_ItemDataBound(object sender, Telerik.Web.UI.GridItemEventArgs e)
{
if (e.Item is GridEditableItem && (e.Item as GridEditableItem).IsInEditMode)
{
GridEditableItem editedItem = e.Item as GridEditableItem;
GridEditManager editMan = editedItem.EditManager;
IItemDbItem w = (IItemDbItem)e.Item.DataItem;
// This doesn't work either, values are all null or empty:
//if (editedItem.CanExtractValues)
//{
// Dictionary<string, string> newValues = new Dictionary<string,string>();
// editedItem.ExtractValues(newValues);
// if (newValues["WorkflowStatus"] != null)
// {
// w.WorkflowStatus = (WorkflowStatus)Enum.Parse(typeof(WorkflowStatus), newValues["WorkflowStatus"]);
// this.Presenter.Update(w.Id, w.WorkflowStatus);
// }
//}
GridDropDownListColumnEditor ctlColumnWorkflow = editMan.GetColumnEditor("ctlColumnGridWorkflow") as GridDropDownListColumnEditor;
ctlColumnWorkflow.DataSource = _workflowStatuses;
ctlColumnWorkflow.DataBind();
ctlColumnWorkflow.SelectedValue = w.WorkflowStatus.ToString();
}
else if (e.Item is GridDataItem)
{
GridDataItem dataItem = e.Item as GridDataItem;
IItemDbItem w = (IItemDbItem)e.Item.DataItem;
dataItem["ctlColumnGridWorkflow"].Text = w.WorkflowStatus.ToString();
}
}
void ctlItemsGrid_ItemCommand(object sender, GridCommandEventArgs e)
{
string cmdName = e.CommandName;
IItemDbItem w = (IItemDbItem)e.Item.DataItem;
switch (cmdName)
{
case "Delete":
this.Presenter.Delete(w.Id);
this.Presenter.LoadView();
break;
case "Update":
// This doesn't work either:
//GridEditableItem editedItem = e.Item as GridEditableItem;
//GridEditManager editMan = editedItem.EditManager;
//DropDownList editWorkflow = (DropDownList)editedItem["ctlColumnGridWorkflow"].Controls[0];
//DropDownList editEvent = (DropDownList)editedItem["ctlColumnGridEvent"].Controls[0];
//this.Presenter.Update(w.Id, (WorkflowStatus)Enum.Parse(typeof(WorkflowStatus));
break;
}
//this.Presenter.LoadView();
}
// Doesn't work:
//void ctlItemsGrid_ItemUpdated(object sender, GridUpdatedEventArgs e)
//{
// GridEditableItem editedItem = e.Item as GridEditableItem;
// GridEditManager editMan = editedItem.EditManager;
// DropDownList editWorkflow = editedItem["ctlColumnGridWorkflow"].Controls[0] as DropDownList;
// IItemDbItem w = (IItemDbItem)e.Item.DataItem;
// this.Presenter.Update(w.Id, (WorkflowStatus)Enum.Parse(typeof(WorkflowStatus), editWorkflow.SelectedValue));
//}
// Doesn't work:
void ctlItemsGrid_UpdateCommand(object sender, GridCommandEventArgs e)
{
GridEditableItem editedItem = e.Item as GridEditableItem;
GridEditManager editMan = editedItem.EditManager;
DropDownList editWorkflow = editedItem["ctlColumnGridWorkflow"].Controls[0] as DropDownList;
IItemDbItem w = (IItemDbItem)e.Item.DataItem;
this.Presenter.Update(w.Id, (WorkflowStatus)Enum.Parse(typeof(WorkflowStatus), editWorkflow.SelectedValue));
}
public IEnumerable<WorkflowStatus> WorkflowStatuses
{
set
{
_workflowStatuses = value;
}
}
public IEnumerable<IItemDbItem> Items
{
get
{
return _items;
}
set
{
_items = value;
}
}
}
I have a separate form to add items (not shown), that works fine. Also the Delete button works fine. When trying to update the saved item, all the values that I can get from the GridDropDownColumn are either null, empty, or the default values, not the edited values. When stepping through and testing things in the Immediate Window in Visual Studio, I was able to find the correct value using this ridiculous statement:
((DropDownList)ctlItemsGrid.MasterTableView.GetItems(GridItemType.EditFormItem)[0].Controls[1].Controls[0].Controls[0].Controls[1].Controls[0].Controls[0].Controls[1].Controls[1].Controls[0]).SelectedValue
But there has to be an easier way. What am I doing wrong?

Answer 1

Odd that the initial implementation didn't work - I cooked up a quick sample project on my end and managed to get the all the information from e.Item.DataItem (albeit only the Id column since we're binding to the DropDownList later).
Is there a strict requirement on grabbing this from the ItemDataBound event? A better event would be the UpdateCommand. You can easily get the item by using some quick code:
protected void ctlItemsGrid_UpdateCommand(object sender, GridCommandEventArgs e)
{
if (e.Item is GridEditableItem && e.Item.IsInEditMode)
{
GridEditableItem item = e.Item as GridEditableItem;
string Employee = (item["ctlColumnGridWorkflow"].Controls[0] as DropDownList).SelectedItem.Text;
}
}
Then you can extract desired values using techniques discussed in this documentation article.
If you still want to approach it like in your first attempt a standalone sample project might be in order to see exactly what is going on.

Answer 2

I'm not sure if this was the right way to fix it, but this works for me:
public partial class administration_modules_item_Default : ViewPageBase<IItemAdminPresenter, IItemAdminView>, IItemAdminView
{
private IEnumerable<WorkflowStatus> _workflowStatuses;
private IEnumerable<IItemDbItem> _items;
protected override void PreloadView()
{
this.ctlItemsGrid.ItemDataBound += new Telerik.Web.UI.GridItemEventHandler(ctlItemsGrid_ItemDataBound);
this.ctlItemsGrid.ItemCommand += new GridCommandEventHandler(ctlItemsGrid_ItemCommand);
this.ctlItemsGrid.NeedDataSource += new GridNeedDataSourceEventHandler(ctlItemsGrid_NeedDataSource);
}
void ctlItemsGrid_NeedDataSource(object sender, GridNeedDataSourceEventArgs e)
{
ctlItemsGrid.DataSource = _items;
}
protected override void PostLoadView()
{
if (!IsPostBack)
{
ctlItemWorkflow.DataSource = _workflowStatuses;
ctlItemWorkflow.DataBind();
}
base.PostLoadView();
}
protected override void OnLoadComplete(EventArgs e)
{
base.OnLoadComplete(e);
ctlItemsGrid.Rebind();
}
void ctlItemsGrid_ItemDataBound(object sender, Telerik.Web.UI.GridItemEventArgs e)
{
if (e.Item is GridEditableItem && (e.Item as GridEditableItem).IsInEditMode)
{
GridEditableItem editedItem = e.Item as GridEditableItem;
GridEditManager editMan = editedItem.EditManager;
IItemDbItem w = (IItemDbItem)e.Item.DataItem;
GridDropDownListColumnEditor ctlColumnWorkflow = editMan.GetColumnEditor("ctlColumnGridWorkflow") as GridDropDownListColumnEditor;
ctlColumnWorkflow.DataSource = _workflowStatuses;
ctlColumnWorkflow.DataBind();
ctlColumnWorkflow.SelectedValue = w.WorkflowStatus.ToString();
}
else if (e.Item is GridDataItem)
{
GridDataItem dataItem = e.Item as GridDataItem;
IItemDbItem w = (IItemDbItem)e.Item.DataItem;
dataItem["ctlColumnGridWorkflow"].Text = w.WorkflowStatus.ToString();
}
}
void ctlItemsGrid_ItemCommand(object sender, GridCommandEventArgs e)
{
string cmdName = e.CommandName;
IItemDbItem w = (IItemDbItem)e.Item.DataItem;
switch (cmdName)
{
case "Delete":
GridDataItem item = e.Item as GridDataItem;
int id = Convert.ToInt32(item.GetDataKeyValue("Id"));
this.Presenter.Delete(id);
this.Presenter.LoadView();
break;
case "Update":
GridEditableItem editedItem = e.Item as GridEditableItem;
GridEditManager editMan = editedItem.EditManager;
DropDownList editWorkflow = (DropDownList)editedItem["ctlColumnGridWorkflow"].Controls[0];
int wid = Convert.ToInt32(editedItem.GetDataKeyValue("Id"));
this.Presenter.Update(wid, (WorkflowStatus)Enum.Parse(typeof(WorkflowStatus), editWorkflow.SelectedValue));
this.Presenter.LoadView();
break;
}
}
public IEnumerable<WorkflowStatus> WorkflowStatuses
{
set
{
_workflowStatuses = value;
}
}
public IEnumerable<IItemDbItem> Items
{
get
{
return _items;
}
set
{
_items = value;
}
}
}
Using the NeedDataSource and Rebind seemed to let the ItemCommand start functioning as expected.