c# PropertyGrid and Interface property

Problem: when object is having:

class A
{
    public ISomeinterface PropertyName { get; set; }
}

and then an instance of that class is assigned to propertyGrid.SelectedObject = new A(); then when trying to edit the value of PropertyName, an exception about fail to make instance of ISomeinterface is shown (make sense of course) the question is how to wo开发者_C百科rkaround this without break my class's and interfaces.?

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Right, PropertyGrid has no hope of guessing how to assign the value. So, hide it:

class A
{
    [Browsable(false)]
    public ISomeinterface PropertyName { get; set; }
}

If property assignment is a requirement then you'll need to implement a UITypeEditor for the property.