Problems with the PropertyGrid control

[hap1983]

When using the PropertyGrid control in ironpython, how to use the CategoryAttribute feature to classify and display properties in the PropertyGrid control?
I know how to do it in C#，using Attribute label：

[Browsable(true), Category("Category"),Description("just a test")]
public int Prop
{
    get { return _prop; }
    set { this._prop = value; }
}

but how to do it in Ironpython？ Looking forward to your reply

[slozier]

I'm not sure about this one, you might be able to do it with clrtype with something like:

import clrtype

class MyClass(metaclass=clrtype.ClrClass):
    __metaclass__ = clrtype.ClrClass # workaround for bug https://github.com/IronLanguages/ironpython3/issues/836
    
    from System.ComponentModel import CategoryAttribute
    Category = clrtype.attribute(CategoryAttribute)
    
    def __init__(self):
        self._prop = 0
    
    @property
    @Category("Category")
    def Prop(self):
        return self._prop
    
    @Prop.setter
    def Prop(self, value):
        self._prop = value

[slozier]

I'm not sure, could you maybe post some sample code of what you're trying to run?

[hap1983]

OK， The following is my code:

import System
import clr
import sys
import os

clr.AddReference('System.Windows.Forms')
clr.AddReference('System.Drawing')
clr.AddReference("System.Xml")
clr.AddReference("System.ComponentModel")

import System.Xml as xml
import System.Drawing
import System.Windows.Forms

import clrtype

import clrtype

class MyClass(clrtype.ClrClass):
    __metaclass__ = clrtype.ClrClass

    from System.ComponentModel import CategoryAttribute
    Category = clrtype.attribute(CategoryAttribute)

    def __init__(self):
        self._prop = 0

    @property
    @Category("Category")
    def Prop(self):
        return self._prop

    @Prop.setter
    def Prop(self, value):
        self._prop = value

class PropertyGridForm(Form):
    def __init__(self):
        self.InitializeComponent()
        self._obj = MyClass()
        self._propertyGrid1.SelectedObject = self._obj

    def InitializeComponent(self):
        self._propertyGrid1 = System.Windows.Forms.PropertyGrid()
        self.SuspendLayout()
        # 
        # propertyGrid1
        # 
        self._propertyGrid1.Dock = System.Windows.Forms.DockStyle.Fill
        self._propertyGrid1.Location = System.Drawing.Point(0, 0)
        self._propertyGrid1.Name = "propertyGrid1"
        self._propertyGrid1.Size = System.Drawing.Size(377, 409)
        self._propertyGrid1.TabIndex = 0
        # 
        # MainForm
        # 
        self.ClientSize = System.Drawing.Size(377, 409)
        self.Controls.Add(self._propertyGrid1)
        self.Name = "MainForm"
        self.Text = "PropertyGrid"
        self.ResumeLayout(False)

form = PropertyGridForm()
form.ShowDialog()

[slozier]

I see where the failure is occurring, this is incorrect:

class MyClass(clrtype.ClrClass):
    __metaclass__ = clrtype.ClrClass

in my example I had:

class MyClass(metaclass=clrtype.ClrClass):
    __metaclass__ = clrtype.ClrClass

and if you're using IronPython 2:

class MyClass(object):
    __metaclass__ = clrtype.ClrClass

[hap1983]

Thanks for reply. I use Ironpython 2.7, if I use “metaclass=clrtype.ClrClass”，there will be a error: "unexpected token '=' at line 1065 in file ". So I changed the code.
Now I use "object" instead, the interpreter give me another error： Duplicate type name within an assembly，ArgumentException. When I delete this line of code：“metaclass = clrtype.ClrClass”，the error disappear and the code runs successfully，but the properties are not categorized in propertygrid control. Could you please give me an example of a successful operation with propetygrid in ironpython？I really appreciate your help

[slozier]

Unfortunately no luck getting it to work. Doesn't seem to be picking up on the Category attributes. I assume clrtype isn't adding the attribute to the .NET class as I was hoping it would.