Question

This code will get us all the properties of a class:

Dim myPropertyInfo As PropertyInfo()
     = myType.GetProperties((BindingFlags.Public Or BindingFlags.Instance))

or in C#:

PropertyInfo[] myPropertyInfo
     = myType.GetProperties(BindingFlags.NonPublic|BindingFlags.Instance);

But is there a way to get just the properties defined as ReadOnly?

Or, equally, to exclude the ReadOnly properties?

Answer 1

Just filter the results to those which have CanWrite as False

Dim items As PropertyInfo() = Me. _
  GetType(). _
  GetProperties(Reflection.BindingFlags.Instance Or Reflection.BindingFlags.Public). _
  Where(Function(x) Not x.CanWrite). _
  ToArray() _

Note the above code sample is assuming Visual Studio 2008 or higher and requires an import of System.Linq. If you’re using an older version you can do the following

Dim props As PropertyInfo() = Me.GetType().GetProperties(Reflection.BindingFlags.Instance Or Reflection.BindingFlags.Public)
Dim readOnlyProps As New List(Of PropertyInfo)
For Each cur in props 
  If Not cur.CanWrite Then
    readOnlyProps.Add(cur)
  End If
Next