Command Class

Reference

Definition

Namespace:: Xamarin.Forms

Assembly:: Xamarin.Forms.Core.dll

Important

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Defines an ICommand implementation that wraps a Action.

public class Command : System.Windows.Input.ICommand

type Command = class
    interface ICommand

Inheritance: Object
Command

Derived: Xamarin.Forms.Command<T>

Implements: ICommand

Remarks

The following example creates a new Command and set it to a button.

var command = new Command (() => Debug.WriteLine ("Command executed"));
var button = new Button {
  Text = "Hit me to execute the command",
  Command = command,
};

More useful scenarios takes a parameter

var command = new Command (o => Debug.WriteLine ("Command executed: {0}", o));
var button = new Button {
  Text = "Hit me to execute the command",
  Command = command,
  CommandParameter = "button0",
};

Constructors

Command(Action)	Initializes a new instance of the Command class.
Command(Action, Func<Boolean>)	Initializes a new instance of the Command class.
Command(Action<Object>)	Initializes a new instance of the Command class.
Command(Action<Object>, Func<Object,Boolean>)	Initializes a new instance of the Command class.

Methods

CanExecute(Object)	Returns a Boolean indicating if the Command can be exectued with the given parameter.
ChangeCanExecute()	Send a CanExecuteChanged
Execute(Object)	Invokes the execute Action

Events

CanExecuteChanged

Occurs when the target of the Command should reevaluate whether or not the Command can be executed.

Applies to