# DelegateCommand

The **DelegateCommand** class provides a simple **ICommand** implementation. It is located in the **Telerik.UI.Xaml.Controls** namespace and exposes the following methods and events:

* **CanExecute:** Defines the method that determines whether the command can execute in its current state.
* **Execute:** Defines the method to be called when the command is invoked.
* **CanExecuteChanged:** Raised when changes occur that affect whether the command should execute.

The **DelegateCommand** constructor has two overloads. The first accepts just a Delegate to execute as a parameter. The second one accepts the **Delegate** to execute as well as a **Predicate** that determines if the delegate can be executed.

#### **Example 1: DelegateCommand implementation in your ViewModel that accepts a delegate and a predicate**

```C#
	
    public class ViewModel
    {
        public ICommand MyCommand { get; set; }

        public ViewModel()
        {
            this.MyCommand = new DelegateCommand(OnMyCommandExecuted, OnMyCommandCanExecute);
        }

        private bool OnMyCommandCanExecute(object obj)
        {
            return true;
        }

        private void OnMyCommandExecuted(object obj)
        {
            MessageBox.Show("Custom Command Executed!");
        }
    }
```

#### **Example 2: Using the command in xaml**

```XAML
	<Button Command="{Binding MyCommand}" Content="Execute command" />
```

## See Also

* [ViewModelBase](https://www.telerik.com/winui/documentation/common/mvvm-helpers/viewmodelbase)
* [BindableCollection](https://www.telerik.com/winui/documentation/common/mvvm-helpers/bindablecollection)