Questions on UI for WPF Forum

2 answers

134 views

hi!!!

i need to display images in a column of the datagrid in code behind.
the images are store in the dataset in byte() format

have i to deserialize the image or what can i do???

GridView

answered on 02 Mar 2010

1 answer

93 views

Performance issue

Hi,

I have a simple application that show grid to the user and according to the user selection i refresh the grid.

when i refresh the grid i do the following:

1) create a new list with the new items

2) grid.ItemsSource = newlist;

if the new list has more than 1000 objects the refresh takes several seconds.

How can i improve the refresh time of the grid ?

I also tried to work with ObservableCollection and update it instead of binding a new list, but it still took several seconds.

Thanks you,

Ofer

GridView

answered on 02 Mar 2010

1 answer

104 views

How to disable GroupPanel in child grid

How can i disable the GroupPanel in a child grid of a hierarchical grid?

I tried:
myChildTableDefinition.SetValue(RadGridView.ShowGroupPanelProperty, false)
But this does not work.

GridView

answered on 02 Mar 2010

0 answers

146 views

GridViewComboBoxColumn - Set Focus and dropdown

Hi.. again...
I have GridViewComboColumn in a GridView. How can I programatically set focus the combox in the current row and open it?
I have button on a form that addes a new row... so I want to set focus to the combobox so the user can begin entereing.... thanks again

<telerikPresentation:GridViewComboBoxColumn DisplayMemberPath="comm_name" SelectedValueMemberPath="comm_name" DataMemberBinding="{Binding comm_name}" Header="Commodity" Width="175" />

GridView

asked on 02 Mar 2010

2 answers

99 views

Where is the click and double events?

Where do I find the double click.. ?

I want to click on the row.. get the SelectedItem and close the window.

thanks again

GridView

answered on 02 Mar 2010

1 answer

106 views

Templating makes control not render

When I edit the control's template at Generics.xaml with the following code, the controls doesn't render.

    
            <Popup x:Name="PART_Popup" AllowsTransparency="True" IsOpen="{Binding IsDropDownOpen, RelativeSource={RelativeSource TemplatedParent}}" Placement="Bottom" StaysOpen="False">     
        
                <Grid x:Name="DropDownRoot">     
        
                    <telerikInput:RadCalendar x:Name="CalendarElement" />    
        
                </Grid>    
        
            </Popup>

If I remove the Name it renders, but doesn't have interaction with the other components of the control such as the PickerTextBox.

If I edit the control's template at user control resources all works fine.

Regards and thank you in advance.

DatePicker

answered on 02 Mar 2010

7 answers

179 views

RadGridView TableRelation not working anymore

Hi,

I got some hierachical RadGridViews in my application, bound to untyped DataSets.
They are not showing any child-rows with the new beta (only the column-headers are visible).

Here is my code:

    
                            TableRelation relation = new TableRelation(); 
        
                            relation.FieldNames.Add(new FieldDescriptorNamePair("id", "master_id")); 
        
                            GridViewTableDefinition childTable = new GridViewTableDefinition() 
        
                            { 
        
                                DataSource = myDataSet.Tables[childTable].DefaultView, 
        
                                Relation = relation,   
        
                            }; 
        
                            radgv_ordersAndOffersToSchedule.TableDefinition.ChildTableDefinitions.Clear(); 
        
                            radgv_ordersAndOffersToSchedule.TableDefinition.ChildTableDefinitions.Add(childTable); 
        
            radgv_ordersAndOffersToSchedule.ItemsSource = myDataSet.Tables["masterTable"].DefaultView;

I tried a lot of things to get it working again, but had no success.

Best Regards
Steffen

General Discussions

answered on 02 Mar 2010

5 answers

573 views

CellTemplate and Bindings

I'm evaluating the RadGridView as a possible data grid for a project I am working on. One of the things I need the grid to do is to use custom controls to display and edit the contents of cells. I can do this with the CellTemplate and CellEditTemplate like so:

                    <controls:GridViewDataColumn Header="Field 1">         
              <controls:GridViewDataColumn.CellTemplate>         
                <DataTemplate>         
                  <my:CustomControl Text="{Binding Field1}"/>         
                </DataTemplate>         
              </controls:GridViewDataColumn.CellTemplate>         
            </controls:GridViewDataColumn>         

The CellEditTemplate works similarly. This code works fine. However, it is not very maintainable. If I have 20 columns in my table that all use those same custom controls, I have to have 20 copies of this code, with only the field name changing. If I need to change that template, such as to add a property setting to my:CustomControl, I have to edit all 20 of those copies.

What I would like to do is make that DataTemplate a shared resource. I have been able to do something like this with some of the other grids I've tried, but I haven't figured out how to do it with RadGridView yet. Obviously hard-coding {Binding Field1} isn't going to work, but I don't know what binding I need to put in there to make it bind to whatever the GridViewDataColumn is bound to. I know I can bind a column to a field by doing the following:

                    <controls:GridViewDataColumn Header="Field 1" DataMemberBinding="{Binding Field1}"/>         

This works as well, if I don't want to use my custom controls. I'm just not sure how to write the DataTemplates in such a way that they bind to whatever that DataMemberBinding is set to.

If this is possible, please let me know so that I can continue my evaluation of the control.

Thanks,

Jason

GridView

answered on 02 Mar 2010

5 answers

169 views

Visual Studio RC, Grid performance

I face a performance issue with Q1 2010 beta and Visual Studio professional Release Candidate (RC, not beta 2).

All the forms with RadGrids take a lot of time to fill the grid with data (for a grid with 100 rows, it takes appr. 30 seconds).

I am using Entity Framework. It is not due to EF, because if I replace RadGrid with MS Data Grid, it is OK.

Q3 2009 was much faster.

By the way, I installed RC because beta 2 stopped working after the installation of Q1 2010. I was getting a message "Visual studio has stopped working" which I could not debug because VS Debuger also could not start. I tried to solve it by reseting VS settings but it didn't work. So, I uninstalled VS Beta 2 and installed VS RC.

Thanks.

General Discussions

answered on 01 Mar 2010

11 answers

191 views

Gridview Formatting Issues

Hey,

I have a problem when trying to format my Gridview text. On my cell I set text alignment using the following:

    
            myCell.TextAlignment = TextAlignment.Right;

And that does what I want to do until I scroll from left to right on my GridView, at which point I get funky alignment results (I've noticed other misc. issues with the gridview control as well... issues with characters being cut off, etc. and most of them relate to scrolling). See image for details (I blanked column names and used fake data on this example).

Is there anything I can try to fix this? It's probably going to be a deal-breaker for this project in terms of using Telerik's gridview control.

GridView

answered on 01 Mar 2010