Questions on UI for WPF Forum

2 answers

270 views

I have just implemented the RadGridView, which was an upgrade from the standard .net DataGrid. I have about 100 items in the grid, with about 12 columns and something as simple as a scroll moves very slow. Scrolling is very jerky, and not smooth. I also noticed that if I add sorting and grouping, there are random delays as new items are added to the grid. These delays can be as long as a few seconds even though I have no more than 100 items in my grid. I have profiled the app, and it says the hottest function call is
Telerik.Windows.Controls.GridView.GridViewVirtualizingPanel.MeasureOverride
This can be make or break for us as we need a low latency high performance data grid.

GridView

answered on 09 Oct 2012

6 answers

171 views

Nullable Int

Hello,

I have an object with a nullable int property that I am binding to the PropertyGrid. If the int property contains a value and I clear it out, it looks like the grid has validation that requires the int to have a value even though it is nullable. Is it possible to allow the int property to be null?

Thanks,
Blake

PropertyGrid

answered on 09 Oct 2012

2 answers

128 views

Populating a TreeListView With a Generic List

I have an MVVM WPF app with a RadTreeListView that is populated via a Generic List<T> using nested sets from a database. Only the first column of the TreeListView gets populated. What class would be appropriate to replace the generic List so that I can pass multiple columns of data to the TreeListView?

I posted this same question, with code, on the WPF Forum of MSDN and was told that my existing approach with List<T> should work with the TreeListView. I was also told that since the question involves a third party control, i.e., Telerik, I should move the question to the Telerik forum.

My xaml showing the data binding:

<telerik:RadTreeListView.Columns>

<telerik:GridViewDataColumn DataMemberBinding="{Binding Tag}"

Header="Tag"

Width="Auto"/>

<telerik:GridViewDataColumn DataMemberBinding="{Binding Description}"

Header="Description"

Width="Auto" />

<telerik:GridViewDataColumn DataMemberBinding="{Binding ImportedEquipmentType}"

Header="Imported Equipment Type"

Width="Auto"/>

</telerik:RadTreeListView.Columns>

The "Description" and "Imported Equipment Type" columns do not get populated.

My code for my data class is as follows. My xaml ItemSource is bound to Children:

public class TagItem

{

public List<TagItem> _children = new List<TagItem>();

public List<TagItem> Children

{

get { return _children; }

}

public string EquipmentID { get; set; }

public string SystemID { get; set; }

public string Tag { get; set; }

public string TagNodeText { get; set; }

public string Tag2 { get; set; }

public string Description { get; set; }

public string Description2 { get; set; }

public string ImportedEquipmentType { get; set; }

public string ManuallyAdded { get; set; }

public string ParentID { get; set; }

public string NodeLeft { get; set; }

public string NodeRight { get; set; }

public string Depth { get; set; }

public string Mpath { get; set; }

}

The constructor for my navigator ViewModel is:

readonly EquipmentListTreeViewModel _equipmentTree;

public EquipmentListNavigator()

{

InitializeComponent();

// Get raw family tree data from a database.

TagItem rootTagItem = Database.GetEquipmentTree();

// Create UI-friendly wrappers around the

// raw data objects (i.e. the view-model).

_equipmentTree = new EquipmentListTreeViewModel(rootTagItem);

// Let the UI bind to the view-model.

base.DataContext = _equipmentTree;

}

And the service that fills the list:

public static TagItem GetEquipmentTree()

{

nTI.Tag = "ASSET REGISTER";

FillTreeView("", nTI);

return nTI;

}

private static void FillTreeView(string currKeyRoot, TagItem nTI = null)

{

DataRows.MyRow row = drows.GetNextRow();

while (row != null)

{

if (NodeStartsWith(row.MPath, currKeyRoot))

{

TagItem tnChild = new TagItem();

tnChild.SystemID = row.SystemID;

tnChild.EquipmentID = row.EquipmentID;

tnChild.Description = row.Description;

tnChild.ParentID = row.ParentID;

tnChild.Mpath = row.MPath;

tnChild.Depth = row.Depth;

tnChild.Tag = row.Tag;

tnChild.Tag2 = row.Tag2;

tnChild.Description2 = row.Description2;

tnChild.ImportedEquipmentType = row.ImportedEquipmentType;

tnChild.ManuallyAdded = row.ManuallyAdded;

tnChild.NodeLeft = row.NodeLeft;

tnChild.NodeRight = row.NodeRight;

nTI.Children.Add(tnChild);

FillTreeView(row.MPath, tnChild);

}

else

{

drows.MovePrev();

return;

}

row = drows.GetNextRow();

}

All of this works except that the tree is populated only in the "Tag" column. "Description" and "Imported Equipment Type" are blank.

TreeListView

answered on 09 Oct 2012

1 answer

69 views

Theming question

Hi,

we use in our application the Telerik OfficeBlue theme, does anybody know how to to get the OfficeBlue theme for the GridSplitter and RadExpander component???

Both of these components are white (too many shade of white in my RadWindow) actually and the splitter doesn't have the "....." indicator so for a user it's a little bit difficult to find where he havr to achor the splitter to change his window disposition.

Thank's

General Discussions

answered on 09 Oct 2012

1 answer

100 views

Undock shaking problem

Hi,

we use VS2008 and Telerik V2012.2.912.35 and we have a docking application with 4 pans and when we start to undock a pan, the pan we start to undock start shaking....

When the pan is is floating and we start to dock it, no problem. If we start to undock it again, the pan start shaking again.

One thing to consider, in my XAML is have such kind of binding for each RadPane:
IsHidden="{Binding ElementName=Me, Path=PaneVisibility}

This binding is to hide each RadPanel when I change the Visibility of my main window.

Any thought???

Thank's

Docking

answered on 09 Oct 2012

3 answers

282 views

Spellchecker Not Releasing Memory

Hi there,

We have an application that uses the RadRichTextBox multiple times in the same dialog, one for each row of data. Each RadRichTextBox makes use of spellchecking. What we've found is that with spellchecking enabled, the memory is not released when the dialog is closed, while it is mostly reclaimed when spellchecking is disabled.

I might be wrong, but what I've figured from using ANTS Memory Profiler is that it seems to be attributed to the DataChanged event on the SpellChecker; the event doesn't seem to be unsetting when the host object should be disposed. This appears to be causing all related controls to remain in memory.

As this control is heavily used in our app, the problems quickly add up, and we've seen OutOfMemoryExceptions occur. The attached file shows the ANTS results. Notice the memory usage between the blue and red markers at the top - the rise in memory usage is attributed to repeatedly opening and closing the same item.

Any assistance with this would be greatly appreciated.

RichTextBox

answered on 09 Oct 2012

1 answer

73 views

Find and replace issue.

Hi,
I have found an issue with find and replece functionality. Actually while find and replace process the text box does not copy the format and styles while replacing text in Replaceall command. It does work with replace commond but with ReplaceAll its not. Can any one suggest me some thing in this regard thanks.

RichTextBox

answered on 09 Oct 2012

2 answers

145 views

problems with WCF service calls

Hello, I have a WCF Web Service, that makes a SQL query to a data base and returns a DataSet with the data.
In my WPF browser app I have a gridView and it's ItemsSource is the DataSet that the service returns, at first I got this code:

if (grid.ItemsSource == null)

{

//Creates the reference for the duplex Service

InstanceContext instanceContext = new InstanceContext(new CallbackHandler());

ServiceReference1.ServiceDuplexClient client2 = new ServiceDuplexClient(instanceContext);

this.Cursor = System.Windows.Input.Cursors.Wait;

//Call the service functon that returns the DataSet

DataSet ds = client2.EventSummary();

this.Cursor = System.Windows.Input.Cursors.Arrow;

if (ds != null)

{

if (ds.DataSetName.Equals("OK"))

{

//If it's OK the DataSet is the ItemsSource of the grid

grid.ItemsSource = ds;

}

It works fine, and does what it's supposed to do, the call to the service takes some moments, so I decided to change the cursor to a clock, but once I had it all working I like to change it for a busy indicator, so I added it to my code:

<telerik:RadBusyIndicator x:Name="busyIndicator" BusyContent="Loading data...." Grid.ColumnSpan="3" Grid.RowSpan="3">

a

public partial class Page1 : Page

{

//Declare my background worker

BackgroundWorker workerOperAct = new BackgroundWorker();

public Page1()

{

InitializeComponent();

workerOperAct.DoWork += this.WorkerOperActDoWork;

workerOperAct.RunWorkerCompleted += WorkerOperActRunWorkerCompleted;

}

private void WorkerOperActDoWork(object sender, DoWorkEventArgs e)

{

//Create the reference for the service

InstanceContext instanceContext = new InstanceContext(new CallbackHandler());

ServiceReference1.ServiceDuplexClient client2 = new ServiceDuplexClient(instanceContext);

//Call the service function that returns the DataSet

DataSet ds = client2.EventSummary();

if (ds != null)

{

if (ds.DataSetName.Equals("OK"))

{

grid.ItemsSource = ds;

}

void WorkerOperActRunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)

{

grid.Visibility = Visibility.Visible;

           this.busyIndicator.IsBusy = false;

}

//More code....

}

It's the same code, and it should work, but when I try to call the service:

DataSet ds = client2.EventSummary();

I get an exception:
An unhandled exception of type 'System.ArgumentOutOfRangeException' occurred in Unknown Module.
Additional information: Index was out of range. Must be non-negative and less than the size of the collection.
If I remove the busy indicator and the background worker it works fine and I can't understand what's happening, I have no clue,
I hope somebody can help me.
Thanks!!

BusyIndicator

answered on 09 Oct 2012

5 answers

161 views

Problem with In-Code-Export

I create an RadChart in the code and i want to export it to a file "png".
I disabled animations!

Now the point is in PieSeriesDefinition & LineSeriesDefinition this is correctly working, but in the BarSeriesDefinition & StackedBarDefinition is painting everything except of the bars!

See screenshots..

Any clue why this could occur? I think the BarSeries has some additional Animations?

Chart