Ilist validation wpf mvvm

class MainWindowViewModel : INotifyPropertyChanged
{
    public ICommand SaveItem
    {
        get { return new SimpleCommand(SaveItemExecute, CanSaveItem); }
    }

    public void SaveItemExecute()
    {
        //save
    }

    private bool CanSaveItem()
    {
        return IsValid;
    }

    //I set up here a breakpoint and it returns the correct value just once.
    //The application looked up on CanSaveItem all the time and except the first time, it returns wrong value
    private bool _isValid;
    public bool IsValid
    {
        get { return _isValid; }
        set
        {
            _isValid = value;
            OnPropertyChanged("IsValid");
        }
    }

    public string EnteredText { get; set; }

    public event PropertyChangedEventHandler PropertyChanged;

    protected virtual void OnPropertyChanged(string propertyName)
    {
        if (this.PropertyChanged != null)
        {
            this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }

}

Source: coderedirect.com

Similar codes

6 votes322 views2 answers
C# datagridview rows clear not working
C#
0 vote319 views1 answer
How to reset disk permission
C#
0 vote336 views1 answer
How to stop a form c#
C#
8 votes314 views3 answers
Save byte array to file c#
C#
0 vote390 views1 answer
How to do multiplication with button c#
C#
6 votes332 views6 answers
Rigidbody velocity
C#
0 vote306 views1 answer
Aps.net core mvc chek box
C#
16 votes320 views1 answer
C# find index element array
C#
1 vote328 views1 answer
Int value from enum in C#
C#
0 vote327 views1 answer
C# decimal with two places store as string with two places
C#