WPF Dictionary Binding failure is very slow

Question

I have most of the Label objects in my app bound such that they can be replaced from a webservice.

I store my replacements in a Dictionary. The repla

Answer 1

If you have the option to, I would change your IDictionary implementation to one that returns null and instead use TargetNullValue (or even be IDictionary and return DependencyProperty.UnsetValue if you still use FallbackValue):

public class PassthruDictionary : IDictionary
{
    private Dictionary instance;

    // ... other stuff

    public TValue this[TKey key]
    {
        get
        {
            TValue value;
            if (instance.TryGetValue(key, out value))
            {
                return value;
            }
            else
            {
                return default(TValue);
            }
        }
        // ... more
    }
}