Questions on UI for WPF Forum

1 answer

849 views

How to show Validation Error Message on GridView level

I have learned that RadGridView has data validation feature per cell and row. But in my case, I want data validation on GridView level. In my app, I have "Purchase Order Form". In this form, there is RadGridView for Purchase Order Items. The validation scenario is User must add at least one item to this RadGridView.

I use the way of Data Annotation and Validation Attribute in my ViewModel to check this validation.

[CollectionHasElements( ErrorMessage = "Purchase order must have at least one order item." )]
        public ObservableCollection<PurchaseOrderItemDecorator> PurchaseOrderItemDecorators
        {
            get { return _purchaseOrderItemDecorator; }
            set { SetProperty( ref _purchaseOrderItemDecorator, value ); }
        }

The RadGridView successfully notify the error by showing Red Border around the grid. But it somehow failed to show the error message. I attached the screenshot of this RadGridView.

In normal telerik wpf controls, it usually shows the error message on top right corner red block triangle. I wish my Gridview act like that for showing validation error message.

Thanks.

GridView

answered on 21 Mar 2016

2 answers

152 views

convert file path to stream

am facing a problem in richtext box

i want to load data through "D:\file.ext" but it shows me error

string cannot convert to stream or byte

RichTextBox

answered on 21 Mar 2016

3 answers

162 views

Initialize datapoints in horizontal axis

I have created a RadCartesianChart that shows live data coming in from a machine in a factory that charts the weight of each unit.

Using this xaml:

<telerik:RadCartesianChart.HorizontalAxis>

<telerik:CategoricalAxis />

</telerik:RadCartesianChart.HorizontalAxis>

With this code-behind:

RadObservableCollection<double> dbl = new RadObservableCollection<double>();

this.chart.Series[0].ItemsSource = dbl;

Then as data comes in, I add doubles to the dbl variable. This all works well but my horizontal axis starts with no datapoints, therefore no demarcation ticks, and the spread of the first datapoints is ridiculously wide, until it reaches a hundred and then I start removing the zeroeth point and adding the next one at the end. Then it maintains a stable appearance.

I have written a hack by adding 100 datapoints with "0" value like this:

dbl = new RadObservableCollection<double

>() { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };

But I wonder if there isn't a "proper" way to get the desired result.

Bob Graham

ChartView

answered on 21 Mar 2016

6 answers

1.0K+ views

How to bind to 'IsChecked' property

I bind ItemsSource property to collection of elements that have 'IsChecked' property. How to bind 'RadTreeViewItem.IsChecked' property to 'MyElement.IsChecked'?

It is needed because I set IsVirtualizing="True" and thus I have to store whether item is checked in separate place.

TreeView

answered on 21 Mar 2016

3 answers

128 views

Is it possible to change the position of the axes ?

Hello,

It could be possible to represent X axis and Y axis into bottom side and right hand, respectively?

<telerik:RadHeatMap x:Name="radHeatMap" ShowToolTips="True" CellBorderThickness="1" CellBorderColor="#FFE4E4E4">

<telerik:RadHeatMap.Definition>

<telerik:CategoricalDefinition ItemsSource="{Binding Path=HeatMapSeries}" RowGroupMemberPath="Z" ColumnGroupMemberPath="X" ValuePath="Y" Colorizer="{StaticResource HeatMapValueGradientColorizer}" />

</telerik:RadHeatMap.Definition>

</telerik:RadHeatMap>

Regards,

Gerard.

HeatMap

answered on 21 Mar 2016

1 answer

90 views

Identical release notes

Hi there,

your release notes

UI for WPF 2016.1.314 Version Notes

and

Previous Version 2016.1.302

are identical.

Reference:

http://www.telerik.com/account/VersionNotes.aspx?nb=1&id=5352

Greets,

Thorsten

General Discussions

answered on 21 Mar 2016

1 answer

227 views

Embed an application in a RadPane.

Hello.

I need to place an application window (for example, notepad.exe) embedded within a RadPane.

I've managed to do in a Window application but do not get into a RadPane.

XAML user control located in the RadPane:

<UserControl x:Class="EmbeddedApp"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

xmlns:d="http://schemas.microsoft.com/expression/blend/2008"

xmlns:local="clr-namespace:I3TV.GAMA.WPF.UI.Media.Player.Player"

xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

d:DesignHeight="300"

d:DesignWidth="300"

mc:Ignorable="d">

<StackPanel x:Name="AppContainer" />

</UserControl>

[DllImport("user32.dll", SetLastError = true)]

private static extern long SetParent(IntPtr hWndChild, IntPtr hWndNewParent);

[DllImport("user32.dll", EntryPoint = "SetWindowLongA", SetLastError = true)]

public static extern int SetWindowLongA([System.Runtime.InteropServices.InAttribute()] System.IntPtr hWnd, int nIndex, int dwNewLong);

[DllImport("user32.dll", SetLastError = true)]

private static extern bool MoveWindow(IntPtr hwnd, int x, int y, int cx, int cy, bool repaint);

private const int GWL_STYLE = (-16);

private const int WS_VISIBLE = 0x10000000;

public EmbeddedApp()

{

InitializeComponent();

this.Loaded += new RoutedEventHandler(OnVisibleChanged);

}

/// <summary>

/// Create control when visibility changes

/// </summary>

/// <param name="e">Not used</param>

protected void OnVisibleChanged(object s, RoutedEventArgs e)

{

// If control needs to be initialized/created

if (_iscreated == false)

{

// Mark that control is created

_iscreated = true;

// Initialize handle value to invalid

_appWin = IntPtr.Zero;

try

{

var procInfo = new System.Diagnostics.ProcessStartInfo(this.exeName);

procInfo.WorkingDirectory = System.IO.Path.GetDirectoryName(this.exeName);

// Start the process

_childp = System.Diagnostics.Process.Start(procInfo);

// Wait for process to be created and enter idle condition

_childp.WaitForInputIdle();

// Get the main handle

_appWin = _childp.MainWindowHandle;

}

catch (Exception ex)

{

Debug.Print(ex.Message + "Error");

}

// Put it into this form

var helper = new WindowInteropHelper(Window.GetWindow(this.AppContainer));

SetParent(_appWin, helper.Handle);

// Remove border and whatnot

SetWindowLongA(_appWin, GWL_STYLE, WS_VISIBLE);

// Move the window to overlay it on this window

MoveWindow(_appWin, 0, 0, (int)this.ActualWidth, (int)this.ActualHeight, true);

}

Thank you!

Docking

answered on 21 Mar 2016

2 answers

117 views

Customizing BulletGraph

Hi,

I'd like to know if it is possible to customize some aspects of the BulletGraph control:

1. When I set the value of Minimum property to a value higher than zero, an oval is shown instead of the bar for the FeaturedMeasure, is it possible to show the bar even when the Minimum property value is higher than zero?

2. Is it possible to hide the axis of values?

3. Is it possible to change the width of the FeaturedMeasure bar? I am using a RadVerticalBulletGraph.

Thanks,

Alberto Martinez

BulletGraph

answered on 18 Mar 2016

1 answer

116 views

Filtering issue QueryableEntityCollectionView with EF

Hi,

Not sure where to put this issue so general discussion perhaps the best place.

I'm using a MVVM model, with the telerik controls WPF TreeView, WPF GridView, WPF DataForm.
As a data backend I'm using Entity Framework code first. This mock-up project works really great.

I'm having an issue with filtering the data of the QueryableEntityCollectionView which I use as a source of the WPF GridView and WPF DataForm.
Filtering is defined as FilterDescriptor filterDeleted = new FilterDescriptor("IsDeleted", FilterOperator.IsEqualTo, false); works just fine.

Now I want to filter on a property of a subobject; Person class has a property Club. Club is also a class.
As the FilterDescriptor is not able to filter on FilterDescriptor("Club.Id", FilterOperator.IsEqualTo, 10);
I've added an Additional propertie in the Model

[NotMapped]
[DisplayName("ClubId")]
public int ClubId
{
get
{
return Club == null ? -1 : Club.Id;
}
}

Defining a FilterDescriptor FilterDescriptor("ClubId", FilterOperator.IsEqualTo, 10) is not working, result is no records at all.
Testing with for example PersonID instead of ClubId works fine.
I've also have a similar ClubId property for calculating Age of person. Filtering on age doesn't work as well. Seems that members not original referencing to table column are not working?

Eric

General Discussions

answered on 18 Mar 2016

6 answers

216 views

Self Reference with DataTable

Hi,

Is it possible to achieve the Self Reference Hierarchy (RadGridView) feature in TreeListView without using list. I mean I have a datatable with the columns like ID, Name, Parent ID, Location, etc.

I have directly binded the DataTable property to the RadGridView like that I have to do with TreeListView to avoid parent child column width, scrolling for child gird, etc.

Please help me to achieve this with TreeListView.

Thanks,
Ramasamy

TreeListView

answered on 18 Mar 2016