MassageBox in WPF Application with MVVM

Start the visual studio and create a WPF application.

Make a ViewModelBase class and inherite the InotifyPropertyChanged interface.

Create a new method in “ViewModelBase” class for show the message like -

  public void MessageBoxShow(string message)

        {

            MessageBox.Show(message, "", MessageBoxButton.OK, MessageBoxImage.Error);

        }

After create a Helper class in helper folder name is BaseCommand and Inharite/implement the Icommand Interface.

Like-

internal class BaseCommand : ICommand

{

private readonly Action _command;

        private readonly Func<bool> _canExecute;

        public BaseCommand(Action command, Func<bool> canExecute = null)

        {

            if (command == null)

                throw new ArgumentNullException("command");

            _canExecute = canExecute;

            _command = command;

        }

        public void Execute(object parameter)

        {

            _command();

        }

        public bool CanExecute(object parameter)

        {

            if (_canExecute == null)

                return true;

            return _canExecute();

        }

        public event EventHandler CanExecuteChanged;

    }

After create a class (EmployeViewModel) in ViewModel  folder and inherite the “ViewModelBase” class and add namespace  the Basecommand class.

Like-

using WPF_MVVM_MessageBox.Helper;

Create a private method in “EmployeViewModel” class for save the data and call the MessageBoxShow method.

private void Save()

        {

           

//here code for Save the Data

            MessageBoxShow("Data Save Successfully.");

        }

Create a Icommand  type property in “EmployeViewModel” class and add the Save method for Execute

Like-

public ICommand ClickCommand { get { return new BaseCommand(Save); } }

Finally add the reference of ViewModel directory in XAML window.

Like-

xmlns:me="clr-namespace:WPF_MVVM_MessageBox.ViewModels" Title="Create Employee" Height="400" Width="400"

After create a Window resource in XAML file.

Like-

<Window.Resources>

        <me:EmployeeViewModel x:Key="viewModel" />

</Window.Resources>

Add a button in XAML file.

Like-

<Button Height="50" Width="100"  Content="Click Me" Name="btnnew" Command="{Binding Source={StaticResource viewModel}, Path= ClickCommand}" />

and bind the button command to “ClickCommand” property.

Finally Run the Application and click on button

cheer.