Modifying structure property in a PropertyGrid

Question

Why SomeClass.ClassField.StructField property doesn\'t change in a propertyGrid? It seems, propertyGrid doesn\'t call SomeClass.

Answer 1

In my case, the generic argument isn't known at compile time (options structure for a plugin). You can get a copy of the current value using context.PropertyDescriptor.GetValue(context.Instance); :

  public override object CreateInstance(ITypeDescriptorContext context, IDictionary propertyValues)
  {
     if (propertyValues == null)
        throw new ArgumentNullException("propertyValues");

     object boxed = context.PropertyDescriptor.GetValue(context.Instance);
     foreach (DictionaryEntry entry in propertyValues)
     {
        PropertyInfo pi = boxed.GetType().GetProperty(entry.Key.ToString());
        if (pi != null && pi.CanWrite)
           pi.SetValue(boxed, Convert.ChangeType(entry.Value, pi.PropertyType), null);
     }
     return boxed;
  }