Develop Reference

Display multiline DynamicResource Label

I wish to add a Label in WPF that displays string from two different DynamicResources.
I want each DynamicResource to be on a new line.
My existing code is:
<Label x:Name="MyTextDisplay"
Grid.Row="3"
Grid.ColumnSpan="2"
Background="Red"
BorderBrush="Blue"
BorderThickness="1"
Margin="2, 2, 2, 2">
<TextBlock TextWrapping="Wrap" Text="{DynamicResource MyTextLine1}" Grid.ColumnSpan="2"/>
</Label>
I have another DynamicResource called MyTextLine2 that I want to display below MyTextLine1 but in the same Label.
How can I do this?
I have looked at these examples here but they dont display on new lines: How to bind multiple values to a single WPF TextBlock?

I faced the same problem and finally I found a solution.
Just use \r\n linebreak instead of just \n.
So, your resourse must look like:
<system:String x:Key="MyText" xml:space="preserve">Line 1
Line 2</system:String>
I realy don't know why this notation must be used only for dynamic resources, but it works for me

WPF Issues with binding to styled button

I have created a RadioButton style which I use across my application. The display part of which uses the content presenter to display whatever content I added to the button:
<ContentPresenter>
<ContentPresenter.ContentTemplate>
<DataTemplate>
<Grid>
<TextBlock Text="{TemplateBinding Content}" />
</Grid>
</DataTemplate>
</ContentPresenter.ContentTemplate>
</ContentPresenter>
I'm then attempting to bind a decimal with a string formatter to the styled button like so:
<RadioButton Content="{Binding Stake, StringFormat={}{0:C}}" Style="{DynamicResource NeutralSelectorButtonStyle}" />
Stake is a decimal within a ViewModel which is set as the DataContext. When I run this up the content coming through is blank.
I made a change using a label in the DataTemplate rather than a TextBlock, this displayed the decimal but had not formatted it.
Can anyone explain why this is happening and possibly provide a solution.
If you require any more information just ask :)
Thanks in advance.

You are almost there just instead of setting the string format inside binding you should use ContentStringFormat property when in ContentControls.
Take a look at this Label (it works with any content control):
<Label Content="{Binding Path=MaxLevelofInvestment}" ContentStringFormat="Amount is {0}"/>
ContentPresenter also has this property:
http://msdn.microsoft.com/en-us/library/system.windows.controls.contentpresenter.contentstringformat%28v=vs.110%29.aspx
Try it out. I hope it works for you.

datatemplate in silverlight c#.net

i am creating a datatemplate for items in listbox and loading it using
(DataTemplate)XamlReader.Load(template), where template is
string template = String.Concat(#
"<DataTemplate xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation' xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'>
<Border BorderBrush='#334873' BorderThickness='1,1,1,1' Width='450'>
<TextBox Height='72' HorizontalAlignment='Left' Margin='10,10,0,0' TextChanged="OnTextChanged" VerticalAlignment="Top" Width="460" />"
...................
"</Border></DataTemplate>");
i m getting error because of "OnTextChanged" event registerd.
I want to register a event in the template code.
How to do it?

To give you an answer: as you are using a Template it's rather difficult to map an event this way because the template doesn't know where it's put into. So OnTextChanged doesn't mean a thing in this context.
You should consider bindings instead. As you allready use a DataTemplate the usual story would be to Bindd the TextBox-Text property to some model-property
<TextBox Height='72' HorizontalAlignment='Left' Margin='10,10,0,0' Text="{Binding MyTextProperty}" VerticalAlignment="Top" Width="460" />"
Of course the DataContext here should have a property MyTextProperty but without your code (where you use the template) I can give no further details.

Editing child objects of a combo box using c# and Wpf

Backgorund
I am currently writing a program that allows a user to select a manufacture from a combo box. The combo box is created in wpf using the following wpf code segment:
<ComboBox Height="23" Margin="40.422,128.423,229.908,0" Name="itemProductManufacture" ToolTip="Click to open drop down menu" VerticalAlignment="Top" Text="Select A Manufacture" SelectionChanged="itemProductManufacture_SelectionChanged" DropDownOpened="itemProductManufacture_DropDownOpened">
<ComboBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding ManufactureId}" Width="0"/>
<Image Name="itemManufactureImage" Source="{Binding ManufactureImage}" Height="15" Width="70" Stretch="Uniform"/>
<TextBlock Text="{Binding ManufactureName}"/>
</StackPanel>
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>
The data is provided form a database and each entry has a Image, a name and an Id (intentionally not shown)
Problem
I am trying to code the behaviour of the combo box so when it is open the image height is 50 and when it is closed it is 15 this is so the image is larger when it is first displayed and then smaller once selected so it doesn't take up too much space on the form.
I have tried editing the image propities using code but am unable to accsess it using its name or any other children of the combo box.
Thanks
Jonathan

As you are using data template you won't be able to access the directly by its name.
Try something like this -
Image image = this.itemProductManufacture.ItemTemplate.FindName("itemManufactureImage", this) as Image;
One thing I am not clear is whether you want to change image size for all the items or the selected one? If you need to access the image for a particulat item in combobox you may have to use the ItemContainerGenerator.ContainerFromItem, as explained in following posts -
WPF - ItemsControl - How do I get find my "CheckBox" item that is in the ItemTemplate?
http://www.sitechno.com/Blog/HowToUseAttachedPropertiesAsAnExtensionMechanismForACheckedListbox.aspx
look at this, To know the various ways of finding controls - How can I find WPF controls by name or type?

You can edit image properties from code using binding. Or you can use triggers in Datatemplate. When comboboxitems checked properties change, you can change height property of corresponding image

Try this:
<Image Height = "{Binding Path=IsDropDownOpen,
RelativeSource={RelativeSource FindAncestor,
AncestorType={x:Type ComboBox}},
Converter={StaticResource myBoolToHeightConverter}}" />
An example for Converter here

Disable Drag-drop from TextBox

I have a WPF textBox that is declared as ReadOnly
<TextBox IsReadOnly="True" IsTabStop="False" Width="200" />
So, User can not write anything into the TextBox or delete the content but it still allows user to drag the text from this textbox and drop it in any other textbox that caused the text removed from the first textbox(the read-only one) and thats unexpected. Is it a bug?
how can I get rid of this?

I tried the following code :
<StackPanel>
<TextBox IsReadOnly="True">Hello</TextBox>
<TextBox></TextBox>
</StackPanel>
When I drag-and-drop the text (after selection) from the first TexbtBox to the second one, the text is copied, but not removed from the first TextBox. I tried it under .NET 3.5 and .NET 4.0 targets.
If you want to get rid of your bug without trying to understand it (since it shouldn't happen), you can just put an empty control (Canvas will be ok) on top of your TextBox, with its Background property set to transparent.
<Grid>
<TextBox IsReadOnly="True" IsTabStop="False" Width="200" />
<Canvas Background="Transparent"/>
</Grid>
But the text won't be selectable anymore...