How bind "value" property of "numericupdown" to a generic property of class that extends "list<T>" and obviously implements interface "inotifypropertychanged" ?

Question

0.00/5 (No votes)

See more:

Hello, I have a class that extends

C#

List<T>

and has a generic property

C#

public class myClass : System.Collections.Generic.List<String>, INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;

    decimal _myProperty;

    public decimal myProperty
    {
       get { return _myProperty; }
       set
       {
           PropertyChanged(this, new PropertyChangedEventArgs("myProperty"));
           _myProperty = value;
       }
}

I bind "myProperty" of an instance of "myClass" to "Value" property of "NumericUpDown"

C#

public partial class myForm : Form
{
    myClass x = new myClass();

    public form_RDG3000_1Ch(RDG3000_1Ch rdg)
    {
        InitializeComponent();

        myNumericUpDown.DataBindings.Add("Value", x, "myProperty", false, DataSourceUpdateMode.OnPropertyChanged);
    }

When I show myForm appears "ArgumentException"

{"Impossibile stabilire l'associazione alla proprietà o alla colonna myProperty di DataSource.
Nome parametro: dataMember"}

Unable to establish the association to the DataSource property or myProperty column.
Parameter name: dataMember

What I have tried:

Nothing ......................

Posted 3-Jul-19 22:42pm

openLG

Updated 4-Jul-19 21:08pm

Richard MacCutchan

v4

Add a Solution

2 solutions

Solution 1

Or, you can subscribe to the "value changed" event for the numeric up down control (via its host class), and get notified / updated that way. Same "change" cycle.

Posted 4-Jul-19 7:17am

Gerry Schmitz

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

BillWoodruff · Accepted Answer · 2019-07-04T21:09:00

Welcome to the "hidden surprises" of WinForms :)

Your code should be valid: it's the fact your Class subclasses List<string> is the problem. And, I have been too lazy (for years) to figure out why :)

Change your class to:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Runtime.CompilerServices;

namespace TestStruct
{
    public class MyClass : INotifyPropertyChanged
    {

        List<string> MyStrings = new List<string>();

        public event PropertyChangedEventHandler PropertyChanged;

        decimal _myProperty;

        public decimal myProperty
        {
            get { return _myProperty; }
            set
            {
                if (PropertyChanged != null) NotifyPropertyChanged(); 
                _myProperty = value;
            }
        }

        protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}