CODEWITHSUNDEEP
wpfxaml
Nikhil ans
Nikhil ans

Reputation: 45

System string value in xaml as StaticResource

Right now in xaml I have sys:String values defined as follows. Is it possible to bind the values from a resource dictionary. Lets say instead of Bmp (harcoded text) I want to say {StaticResource Bmp}. The Bmp value comes from some resource. Please help.

xmlns:sys="clr-namespace:System;assembly=mscorlib"
    <x:Array
                Type="{x:Type sys:String}"
                x:Key="ImageFormatsArray">
                <sys:String>Bmp</sys:String>
                <sys:String>Png</sys:String>
                <sys:String>Jpg</sys:String>
                <sys:String>Tif</sys:String>
                <sys:String>Gif</sys:String>
            </x:Array>

Upvotes: 0

Views: 2564

Answers (1)

Mike Strobel
Mike Strobel

Reputation: 25623

Yes, you can. Just replace the relevant <sys:String> entry with a StaticResource reference:

<sys:String x:Key="BitmapFormat">Bmp</sys:String>

<x:Array x:Key="ImageFormatsArray"
         Type="{x:Type sys:String}">
  <StaticResource ResourceKey="BitmapFormat" />
  <sys:String>Png</sys:String>
  <sys:String>Jpg</sys:String>
  <sys:String>Tif</sys:String>
  <sys:String>Gif</sys:String>
</x:Array>

However, this only works as a static resource; you can't use a binding or a dynamic resource. That means the resource must be in scope at the time the Xaml is parsed and the array is created.

You could also reference a named constant using x:Static:

public static class ImageFormats
{
    public const string Bitmap = "Bmp";
}

<x:Array x:Key="ImageFormatsArray"
         Type="{x:Type sys:String}">
  <x:Static Member="local:ImageFormats.Bitmap" />
  <!-- ... more formats -->
</x:Array>

Of course, if you're going to go that far, you may as well just hard-code the entire list:

public static class ImageFormats
{
    public const string Bitmap = "Bmp";
    public const string Png = "Png";
    public const string Jpeg = "Jpg";
    public const string Tiff = "Tif";
    public const string Gif = "Gif";

    public static readonly IReadOnlyList<string> AllFormats = 
        new[] { Bitmap, Png, Jpeg, Tiff, Gif };
}

And then use x:Static to access the list of formats:

<ComboBox ItemsSource="{x:Static local:ImageFormats.AllFormats}" />

Upvotes: 1

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