WPF Discussion Boards

How to disable Button in RadGridView.

4-Aug-11 8:50

If you give a ControlTemplate a key as you have above, its not applied to anything unless you specifically tell it to use that template. If it doesn't have an x:Key, its applied to everything.

Sunil G 33-Aug-11 20:00

Sunil G 3

3-Aug-11 20:00

Hello,

I have a RadGridView in my application. In that grid there is one column named "GridViewDataColumn" and in that column there is 3 buttons. Now out of 3 buttons I want to disable/enable one button on a particular condition. Can anybody Help me.

Regards,
Sunil G.

Re: How to disable Button in RadGridView.

Mycroft Holmes4-Aug-11 13:00

Mycroft Holmes

4-Aug-11 13:00

Look into cellstyleselecteor at Telerik, this allows you to manage a cell based on the content, not sure if it can be coerced into managing the content of the cell.

I would ask this in the Telerik support forums, I find them very helpful supporting their products.

Never underestimate the power of human stupidity
RAH

Error: Cannot find governing FrameworkElement for target element

John-ph3-Aug-11 19:39

John-ph

3-Aug-11 19:39

Same issue[^] and the work around given here works perfect but has a disadvantage that designers cannot work on the UI part if we move the code to the converter. any alternate?

- Regards -
J O N

A good thing is a bad thing if it keeps you from the best thing. - Dr. Adrian Rogers

Silverlight Bussines Application user authentication

Eren Can Kaygusuz2-Aug-11 22:06

Eren Can Kaygusuz

2-Aug-11 22:06

Hello

How can i arrange user roles and groups at Silverlight bussines app.

Thanks...

Re: Silverlight Bussines Application user authentication

Mycroft Holmes4-Aug-11 13:03

Mycroft Holmes

4-Aug-11 13:03

You're questions are too generic, you are looking for design information in a forum post. This indicates you need to do some more study, either a book or peruse the articles on your subject. These question cannot be answered in a simple forum post.

Never underestimate the power of human stupidity
RAH

Silverlight Bussines Application Domain Service

Eren Can Kaygusuz2-Aug-11 22:00

Eren Can Kaygusuz

2-Aug-11 22:00

Hello,

i started building project with Silverlight bussines app.i added EntityModel and Domain Service,in Client side i can see entityobjects (like cars) i can not see CRUD controls(insert,update,delete ) ..

DomainService1 service= new DomainService1
service.insertCar is not shown.

What must i do.

Thanks.

Math in XAML

Mc_Topaz2-Aug-11 3:15

Mc_Topaz

2-Aug-11 3:15

I would like to do some simple math in my WPF application with as much XAML code as possible and with as little C# code as possible. I have looked at various examples how to do this on diffrent web pages, but they are either to complex or don't show all details or lacks code or is just a bad example.

Please run my XAML code, just copy and paste it:

XAML

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    
    <Window.Resources>
        <Style x:Key="Alignment">
            <Setter Property="Control.HorizontalAlignment" Value="Left"></Setter>
            <Setter Property="Control.VerticalAlignment" Value="Top"></Setter>
        </Style>
        <Style x:Key="GroupBoxStyle" BasedOn="{StaticResource Alignment}">
            <Setter Property="Control.BorderBrush" Value="Black"></Setter>
            <Setter Property="Control.BorderThickness" Value="2"></Setter>
            <Setter Property="Control.FontSize" Value="15"></Setter>
        </Style>
        <Style x:Key="Header">
            <Setter Property="Control.FontSize" Value="15"></Setter>
            <Setter Property="Control.FontWeight" Value="Bold"></Setter>
            <Setter Property="Control.Height" Value="30"></Setter>
        </Style>
    </Window.Resources>

    <Grid>
        <GroupBox Header="Product schedule" Margin="0,0,0,0" Style="{StaticResource GroupBoxStyle}"  Width="Auto" Height="Auto">
            <Grid>
                <Grid.RowDefinitions>
                    <RowDefinition Height="Auto"/>
                    <RowDefinition Height="Auto"/>
                    <RowDefinition Height="Auto"/>
                    <RowDefinition Height="Auto"/>
                </Grid.RowDefinitions>

                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="Auto"/>
                    <ColumnDefinition Width="Auto"/>
                    <ColumnDefinition Width="Auto"/>
                    <ColumnDefinition Width="Auto"/>
                </Grid.ColumnDefinitions>

                <!-- Header -->
                <Label Content="Product" Grid.Row="0" Grid.Column="0" Style="{StaticResource Header}"></Label>
                <Label Content="Weight (g)" Grid.Row="0" Grid.Column="1" Style="{StaticResource Header}"></Label>
                <Label Content="Numbers" Grid.Row="0" Grid.Column="2" Style="{StaticResource Header}"></Label>
                <Label Content="Total weight (g)" Grid.Row="0" Grid.Column="3" Style="{StaticResource Header}"></Label>

                <!-- Product A -->
                <Label Content="A" Grid.Row="1" Grid.Column="0"></Label>
                <Label Content="126" Grid.Row="1" Grid.Column="1"></Label>
                <TextBox Name="txtA" Grid.Row="1" Grid.Column="2"></TextBox>
                <Label Name="lblATotalWeightGram" Grid.Row="1" Grid.Column="3"></Label>

                <!-- Product B -->
                <Label Content="B" Grid.Row="2" Grid.Column="0"></Label>
                <Label Content="220" Grid.Row="2" Grid.Column="1"></Label>
                <TextBox Name="txtB" Grid.Row="2" Grid.Column="2"></TextBox>
                <Label Name="lblBTotalWeightram" Grid.Row="2" Grid.Column="3"></Label>

                <!-- Total -->
                <Label Content="Total" Grid.Row="3" Grid.Column="0"></Label>
                <Label Name="lblPiiGABTotal" Grid.Row="3" Grid.Column="2"></Label>
                <Label Name="lblPiiGABTotalWeightGram" Grid.Row="3" Grid.Column="3"></Label>
                <Label Name="lblPiiGABTotalWeightKiloGram" Grid.Row="3" Grid.Column="4"></Label>
            </Grid>
        </GroupBox>
    </Grid>
</Window>

Notice I have two Textboxes to specify numbers of product A and product B.
I would like to calculate the following:

1) Total Weight in g for each product: A * 126 and B * 220
2) Calculate total amounth of products: A + B
3) Calculate total weight of all products: (A * 126) + (B * 220)

This should be done if I change any values in the TextBoxes.

Any help would be nice!

dasblinkenlight2-Aug-11 5:53

dasblinkenlight

2-Aug-11 5:53

Short answer is "yes, it is possible".

The long answer is a lot less pleasant: it can't be done for free. Pulling this trick requires work. In fact, it requires a lot of work.

Here are the basic steps:

1. First, you need an expression library capable of evaluating expressions presented to it as strings. You can either build one (making a high-performance evaluation library on top of Linq expressions is surprisingly simple), or adopt one written by someone else (for example, this one: Expression Evaluator[^]).
2. Next, you will need to build a Converter class, which is a small adapter for using your expression evaluator in XAML. One class can implement both IMultiValueConverter.aspx[^] and IValueConverter[^], and expose a string property called "Source".
3. Import the assembly with your adapter into your XAML file by adding a clr-namespace referencing your assembly to the Windows element. xmlns:Converter="clr-namespace:MyNamespace.Converter;assembly=MyConverterAssembly"
4. Add a resource for each expression that you would like evaluated from your XAML:

<Converter:ExpressionValueConverter
    x:Key="CalcTotalWeight"
    Source="(arg1 * 126) + (arg2 * 220)"
/>

5. Use binding or multi-binding to attach your expression to labels and text boxes in your XAML:

XML

<MultiBinding Converter="{StaticResource CalcTotalWeigh}" FallbackValue="0">
    <Binding Path="txtA"/>
    <Binding Path="txtB"/>
</MultiBinding>

I went through this exercise once, and I can tell you that it is not easy. And I started with a well-tested expression library from step 1! But once you put it all together, it looks like a small miracle.

Mc_Topaz2-Aug-11 6:22

Mc_Topaz

2-Aug-11 6:22

Thanks!

Since I'm no master in XAML and I can practically do nothing if I don't have a simple and exact example, your guide will do me no good.

I think I will skip this method and use the old fashion C# way instead. Ugly but easy...

Pete O'Hanlon2-Aug-11 6:08

Pete O'Hanlon

2-Aug-11 6:08

You could accomplish this entirely in your XAML by using inline code (it's not pretty, and it's not good practice, but it is possible). Basically, you would implement an <x:Code> section where you would put the code in place to handle the calculations, etc. The important thing to remember is that you should encode your code so that you have something that looks like this:<x:Code>
<![CDATA[
// Do your work here
]]>
</x:Code>

Forgive your enemies - it messes with their heads

My blog | My articles | MoXAML PowerToys | Mole 2010 - debugging made easier - my favourite utility

Mc_Topaz2-Aug-11 6:40

Mc_Topaz

2-Aug-11 6:40

Thanks!

I tried that and it worked. But I don't like the method at all.

SledgeHammer012-Aug-11 7:22

Re: Client side validation

2-Aug-11 7:22

Theres already one built for you.

http://wpfconverters.codeplex.com/wikipage?title=User%20Documentation#ExpressionConverter[^]

Client side validation

yesu prakash1-Aug-11 20:14

yesu prakash

1-Aug-11 20:14

Hi,
I want to validate the controls in asp.net silverlight when click a button before save.
We need any validation controls or javascript?
i need to work same as asp.net validation control or javascript validation.

Regards,
YPKI

Mycroft Holmes4-Aug-11 13:07

Mycroft Holmes

4-Aug-11 13:07

Your question does not make sense, you are asking for information about both asp.net and silverlight, in a silverlight forum. Either you are using silverlight or not, decide and then ask a more appropriate question.

You do not use javascript to validate silverlight input, javascript works in conjunction with asp (html) not xaml.

Never underestimate the power of human stupidity
RAH

Distance Calculate Of A Route

mrhydn1-Aug-11 3:44

mrhydn

1-Aug-11 3:44

Hi... I want to distance calculate of a route with Bing Maps in Silverlight 4 (Using VB.Net- NOT C#)

I can calculate a route between two cities but I don't know how many kilometers that ROUTE...I want to learn it... That is important for me...

Grid in a combo box [modified]

Lutosław31-Jul-11 2:57

31-Jul-11 2:57

Hello again!

I have searched for it but couldn't find an apropriate solution.

I have a list of objects, and I want to arrange them in rows, but still allowing user to select any individual item. For example:

list = { a1, a2,a3,b1,b2,b3}

In a combobox I would like to see:

[   ]V
a1  a2  a3
b1  b2  b3

Items in a combobox are enumeration members and value of a combobox should be bound.
User can select any value from the list. Moreover, items a2,b2,c2,... (that is, when index%3==1) should appear in bold (extra feature).

I have tried to set a List<List<MyClass>> as a datasource, but in that case user would be able to set a whole row and not individual items. Such behaviour is unacceptable.

How to accomplish this?

Thanks in advance,

Greetings - Jacek

modified on Sunday, July 31, 2011 6:56 PM

Re: Grid in a combo box

teejayem31-Jul-11 6:42

teejayem

31-Jul-11 6:42

From MSDN[^] - A ListBoxItem is a ContentControl, which means that it can contain a single object of any type (such as a string, an image, or a panel).

This means you can directly add any type of content you wish (like a grid).

Grid grid = new Grid();
grid.Children.Add(new TextBlock { Text = "Hello"});

listBox.Items.Add(grid);

Or you can use a grid in your ItemTemplate

<ListBox x:Name="listBox" HorizontalAlignment="Stretch" HorizontalContentAlignment="Stretch">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <Grid HorizontalAlignment="Stretch">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition />
                    <ColumnDefinition />
                    <ColumnDefinition />
                </Grid.ColumnDefinitions>

                <TextBlock Grid.Column="0" Text="{Binding Property1}" FontWeight="{Binding Path=Property1, Converter={StaticResource fontWeightConverter}}" />
                <TextBlock Grid.Column="1" Text="{Binding Property2}" FontWeight="{Binding Path=Property2, Converter={StaticResource fontWeightConverter}}" />
                <TextBlock Grid.Column="2" Text="{Binding Property3}" FontWeight="{Binding Path=Property3, Converter={StaticResource fontWeightConverter}}" />
            </Grid>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

listBox.ItemsSource = new MyClass[] {
    new MyClass { Property1 = "a1", Property2 = "a2", Property3 = "a3"},
    new MyClass { Property1 = "b1", Property2 = "b2", Property3 = "b3"},
    new MyClass { Property1 = "c1", Property2 = "c2", Property3 = "c3"},
};

and the FontWeightConverter

public class FontWeightConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        String item = value as String;
        if (item == null) return FontWeights.Normal;

        int index = int.Parse(item.Substring(1, 1));

        return index % 3 == 1 ? FontWeights.Bold : FontWeights.Normal;
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

Don't be overcome by evil, but overcome evil with good

Re: Grid in a combo box

Lutosław1-Aug-11 13:14

1-Aug-11 13:14

Thanks for your answer!

Unfortunately, I don't see how user could select, let say, "a3" in a grid without selecting "a1" and "a2". The list of possible values is flat, and the selection is bound to a single property. User has to choose a single item. Arranging items in a grid is a layout/GUI issue and does not reflect application logic.

Less important: let's say that ther are n columns in a grid. The solution which you have kindly provided fixes n=3. Not so bad since the number of columns will be fixed, but IMHO it is risky and not easily scalable.

Greetings - Jacek

Re: Grid in a combo box

SledgeHammer011-Aug-11 14:05

Re: Grid in a combo box [solved]

1-Aug-11 14:05

Actually, a much simpler implementation would be to just swap out the item panel for a WrapPanel. Then you could select individual items...

Simple as 1-2-3...

<ComboBox Height="23" HorizontalAlignment="Left" Margin="177,136,0,0" Name="comboBox1" VerticalAlignment="Top" Width="120">
<ComboBoxItem Content="Item 1" />
<ComboBoxItem Content="Item 2" />
<ComboBoxItem Content="Item 3" />
<ComboBoxItem Content="Item 4" />
<ComboBoxItem Content="Item 5" />
<ComboBox.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel />
</ItemsPanelTemplate>
</ComboBox.ItemsPanel>
</ComboBox>

Lutosław1-Aug-11 22:57

Re: Grid in a combo box [solved]

1-Aug-11 22:57

This is what I needed! Thanks very much!
You have a knowledge of the framework.

In this specific scenario, the exact solution is:

<WrapPanel ItemWidth="45" Width="225" />

which gives exactly 5 items in a row, as requested.

Greetings - Jacek

SledgeHammer012-Aug-11 7:20

Re: Grid in a combo box [solved]

2-Aug-11 7:20

You're welcome. BTW... forgot to mention the bold thing... you should use the ListBox AlternationCount for the bold feature.

Lutosław2-Aug-11 8:52