Simple small INotifyPropertyChanged implementation

Question

Say I have the following class:

public MainFormViewModel
{
    public String StatusText {get; set;}
}

What is the easiest smallest way to g

Answer 1

I have a base class called "Model". It exposes a protected object called DataPoints, which is essentially a dictionary.

C#

public String StatusText {
    get { 
        return (string)DataPoints["StatusText"]; 
    } 
    set { 
        DataPoints["StatusText"] = value; 
    }
}

VB

public Property StatusText as String 
    get 
        return DataPoints!StatusText 
    end get 
    set
        DataPoints!StatusText = value
    end set
end property

When you set a value in the DataPoints dictionary it does the following:

1. Checks to make sure the value actually changed.
2. Saves the new value
3. Sets the IsDirty property to true.
4. Raises the Property Changed event for the named property as well as the IsDirty and IsValid properties.

Since it is a dictionary, it also makes loading objects from a database or XML file really easy.

Now you may think reading and writing to dictionary is expensive, but I've been doing a lot of performance testing and I haven't found any noticable impact from this in my WPF applications.