UserControl update image based on datatype - wpf

Question

I have a program that displays either customer, company or employee info. I would like to display an icon next to this image with the icon changing based on the type of info I am displaying (customer, company or employee).
I have the following setup in my resource dictionary to specify the images:
<ImageSource x:Key="CompanyIcon">../Images/companies_32.png</ImageSource>
<ImageSource x:Key="EmployeeIcon">../Images/employee_32.png</ImageSource>
<ImageSource x:Key="CustomerIcon">../Images/customer_32.png</ImageSource>
In my viewmodel I would like to assign the image based on what data type I am working with. For instance if I am viewing a company's info (a DBContext of type 'Company' using EF 4.5) I want to set the image to that of 'CompanyIcon'.
How would I assign the image with the viewmodel (and change it as I change between a 'Company', 'Employee' or 'Customer' DBContext type) and then bind this image to a placeholder in the view (it will be displayed within a grid column).

Answer 1

I would use a DataTrigger that sets the Image.Source based on the object type, and use a Converter that returns the typeof(value) for getting the type
<Style x:Key="MyStyle" TargetType="{x:Type Image}">
<!-- Default Value -->
<Setter Property="Source" Value="{StaticResource CompanyIcon}" />
<Style.Triggers>
<DataTrigger Binding="{Binding Converter={StaticResource ObjectToTypeConverter}}"
Value="{x:Type local:Employee}">
<Setter Property="Source" Value="{StaticResource EmployeeIcon}" />
</DataTrigger>
<DataTrigger Binding="{Binding Converter={StaticResource ObjectToTypeConverter}}"
Value="{x:Type local:Customer}">
<Setter Property="Source" Value="{StaticResource CustomerIcon}" />
</DataTrigger>
</Style.Triggers>
</Style>
The converter I usually use just looks like this:
public class ObjectToTypeConverter : IValueConverter
{
#region IValueConverter Members
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
if (value == null)
return null;
return value.GetType();
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
#endregion
}

Answer 2

What I did was to have a string property in the VM pointing to the image location (don't know if it's the best approach, but it worked quite well for me):
private string _imageSource;
public string ImageSource
{
get
{
return _imageSource;
}
set
{
_imageSource = value;
NotifyPropertyChanged(() => ImageSource);
}
}
public void SetImage()
{
If (customer)
ImageSource = "../Images/companies_32.png";
...
}
in XAML:
<Image Source="{Binding ImageSource}" .../>