How to Create Custom MarkupExtension like StaticResource?

Question

please help me how to create a MarkupExtension looks like StaticResource of wpf, i have:

my own class:

public class Item{

public string Value{get; s         


        

Answer 1

You could take the resource key into your custom markup extension as a parameter via Constructor.

You could then, in your ProvideValue mehtod, create a StaticResourceExtension and get the actual resource (in your case an instance of Item) by calling ProvideValue method.

Quick Implementation

[MarkupExtensionReturnType(typeof(string))]
public class MyExtension : MarkupExtension
{
    public MyExtension(string resourceKey)
    {
        ResourceKey = resourceKey;
    }

    string ResourceKey { get; set; }

    public override object ProvideValue(IServiceProvider serviceProvider)
    {
        var staticResourceExtension = new StaticResourceExtension(ResourceKey);

        var resource = staticResourceExtension.ProvideValue(serviceProvider) as Item;

        return resource == null ? "Invalid Item" : String.Format("My {0} {1}", resource.Value, resource.Title);
    }
}

You may have to add more code in ProvideValue to handle design mode, etc.