.NET property not accessible in derived classes where only the setter or the getter has been overridden #1455

spynetcamera · 2021-05-13T20:43:05Z

Environment

Pythonnet version: 2.5.2
Python version: 3.7
Operating System: Windows 10
.NET Runtime: 4.8

Details

Let's create a simple base class that exposes a property, then create a derived class that overrides the setter, but not the getter (that is supposed to be as it was defined in the base class)

namespace PythonNetTest
{
    public class BaseClass
    {
        protected string name = "noname";

        public virtual string Name { get => name; set => name = value; }
    }

    public class DerivedClass : BaseClass
    {
        public override string Name { set => base.Name = value.ToUpper(); }
    }
}

Let's now use the above classes in Python

import clr
clr.AddReference("PythonNetTest")
from PythonNetTest import BaseClass, DerivedClass

d = DerivedClass()
b = BaseClass()

b.Name = 'BaseClass Name'
d.Name = 'DerivedClass Name'

print(b.Name)   # ok
print(d.Name)   # TypeError: property cannot be read

Here the print(d.Name) will rise the exception TypeError: property cannot be read.
As a workaround it is possible to use print(d.GetType().BaseType.GetProperty('Name').GetValue(d)) instead, but it is not one would expect.

The text was updated successfully, but these errors were encountered:

…etMethod would not return base non-overriden accessor for a partially overriden property because of that when constructing PropertyObject we scan base classes to find base accessor (if any) this might have performance implications due to replacement of PropertyInfo.GetValue with getter.Invoke (not tested) fixes pythonnet#1455

…etMethod would not return base non-overriden accessor for a partially overriden property because of that when constructing PropertyObject we scan base classes to find base accessor (if any) this might have performance implications due to replacement of PropertyInfo.GetValue with getter.Invoke (not tested) fixes #1455

lostmsu added this to the 3.0.0 milestone Sep 23, 2021

lostmsu added the bug label Oct 1, 2021

lostmsu mentioned this issue Dec 28, 2021

Fixed accessing partially overriden properties from Python #1650

Merged

1 task

lostmsu closed this as completed in #1650 Jan 4, 2022

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.NET property not accessible in derived classes where only the setter or the getter has been overridden #1455

.NET property not accessible in derived classes where only the setter or the getter has been overridden #1455

spynetcamera commented May 13, 2021

.NET property not accessible in derived classes where only the setter or the getter has been overridden #1455

.NET property not accessible in derived classes where only the setter or the getter has been overridden #1455

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spynetcamera commented May 13, 2021

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