Command

Wisej.Web.Command

Namespace: Wisej.Web

Assembly: Wisej.Framework (3.0.0.0)

Implements the ICommand interface wrapping execute and canExecute actions.

C#

public class Command : ICommand

VB.NET

You can use this class and Command to wrap custom commands to bind to controls that implement the ICommandSource interface. A view model class can expose as many commands as you like. You can bind (or assign) a command to the Command property (see Command for example).

public CommandDemoViewModel : INotifyPropertyChanged
{
  public event PropertyChangedEventHandler PropertyChanged;
  
  public int Number { ... }
  
  public Wisej.Web.ICommand AddCommand { get; }
  
  public CommandDemoViewModel()
  {
    this.AddCommand = new Command(args => this.Number++);
    
    // Or
    this.AddCommand = new Command(
      execute: args => this.Number++,
      canExecute: args => this.Number < 10
    );
  }
}

Now you can use data binding or a code assignment to connect the view model's Add command to a button's Command property.

Constructors

Command(execute, canExecute)

Initializes a new Command wrapping am execute method and an canExecute method.

Name	Type	Description
execute	Action<CommandArgs>	Invoked by the ICommandSource to perform a command.
canExecute	Func<CommandArgs, Boolean>	Invoked by the ICommandSource to determine weather it can execute the execute function.

Methods

CanExecute(args)

Executes a method that determines whether the command can execute in its current state.

Parameter	Type	Description
args	CommandArgs	A CommandArgs that contains data that can be used by the command.

Returns: Boolean. true if this command can be executed; otherwise, false.

ChangeCanExecute()

Fires the CanExecuteChanged event.

Execute(args)

Executes the command method.

Parameter	Type	Description
args	CommandArgs	A CommandArgs that contains data that can be used by the command.

Events

CanExecuteChanged

EventHandler Fired when the result of the CanExecute method changes.

Inherited By

Name	Description
Command<T>	Implements the ICommand interface wrapping execute and canExecute actions.

Implements

Name	Description
ICommand	Defines a command that can be used for data binding.