# Command

Namespace: **Wisej.Web**

Assembly: **Wisej.Framework** (4.0.0.0)

Implements the [ICommand](/api/wisej.web/interfaces/wisej.web.icommand.md) interface wrapping execute and canExecute actions.

{% tabs %}
{% tab title="C#" %}

```csharp
public class Command : ICommand
```

{% endtab %}

{% tab title="VB.NET" %}

```visual-basic
Public Class Command
    Inherits ICommand
```

{% endtab %}
{% endtabs %}

You can use this class and [Command](/api/wisej.web/data-binding/wisej.web.command.md) to wrap custom commands to bind to controls that implement the [ICommandSource](/api/wisej.web/interfaces/wisej.web.icommandsource.md) interface. A view model class can expose as many commands as you like. You can bind (or assign) a command to the [Command](/api/wisej.web/interfaces/wisej.web.icommandsource.md#command) property (see [Command](/api/wisej.web/buttons/wisej.web.buttonbase.md#command) for example).

```csharp

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](/api/wisej.web/buttons/wisej.web.buttonbase.md#command) property.

## Constructors

### ![](/files/hsR4ok3152WyAf8J2C1u) Command(execute, canExecute)

Initializes a new [Command](/api/wisej.web/data-binding/wisej.web.command.md) wrapping an *execute* method and an *canExecute* method.

| Name           | Type                                                                  | Description                                                                                                                                        |
| -------------- | --------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------- |
| **execute**    | [Action](https://docs.microsoft.com/dotnet/api/system.action)         | Invoked by the [ICommandSource](/api/wisej.web/interfaces/wisej.web.icommandsource.md) to perform a command.                                       |
| **canExecute** | [Func\<Boolean>](https://docs.microsoft.com/dotnet/api/system.func-1) | Invoked by the [ICommandSource](/api/wisej.web/interfaces/wisej.web.icommandsource.md) to determine whether it can execute the *execute* function. |

### ![](/files/hsR4ok3152WyAf8J2C1u) Command(execute, canExecute)

Initializes a new [Command](/api/wisej.web/data-binding/wisej.web.command.md) wrapping an *execute* method and an *canExecute* method.

| Name           | Type                                                                               | Description                                                                                                                                        |
| -------------- | ---------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------- |
| **execute**    | [Action\<CommandArgs>](https://docs.microsoft.com/dotnet/api/system.action-1)      | Invoked by the [ICommandSource](/api/wisej.web/interfaces/wisej.web.icommandsource.md) to perform a command.                                       |
| **canExecute** | [Func\<CommandArgs, Boolean>](https://docs.microsoft.com/dotnet/api/system.func-2) | Invoked by the [ICommandSource](/api/wisej.web/interfaces/wisej.web.icommandsource.md) to determine whether it can execute the *execute* function. |

## Methods

### ![](/files/hsR4ok3152WyAf8J2C1u) CanExecute(args)

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

| Parameter | Type                                                                | Description                                                                                                               |
| --------- | ------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------- |
| **args**  | [CommandArgs](/api/wisej.web/data-binding/wisej.web.commandargs.md) | A [CommandArgs](/api/wisej.web/data-binding/wisej.web.commandargs.md) that contains data that can be used by the command. |

**Returns:** [Boolean](https://docs.microsoft.com/dotnet/api/system.boolean). true if this command can be executed; otherwise, false.

### ![](/files/hsR4ok3152WyAf8J2C1u) Execute(args)

Executes the command method.

| Parameter | Type                                                                | Description                                                                                                               |
| --------- | ------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------- |
| **args**  | [CommandArgs](/api/wisej.web/data-binding/wisej.web.commandargs.md) | A [CommandArgs](/api/wisej.web/data-binding/wisej.web.commandargs.md) that contains data that can be used by the command. |

### ![](/files/hsR4ok3152WyAf8J2C1u) RaiseCanExecuteChanged()

Fires the [CanExecuteChanged](#canexecutechanged) event.

## Events

### ![](/files/hsR4ok3152WyAf8J2C1u) CanExecuteChanged

[EventHandler](https://docs.microsoft.com/dotnet/api/system.eventhandler) Fired when the result of the [CanExecute](#canexecute-args) method changes.

## Inherited By

| Name                                                                                     | Description                                                                                                                   |
| ---------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------- |
| [Command\<T>](/api/wisej.web/data-binding/wisej.web.command-less-than-t-greater-than.md) | Implements the [ICommand](/api/wisej.web/interfaces/wisej.web.icommand.md) interface wrapping execute and canExecute actions. |

## Implements

| Name                                                        | Description                                          |
| ----------------------------------------------------------- | ---------------------------------------------------- |
| [ICommand](/api/wisej.web/interfaces/wisej.web.icommand.md) | Defines a command that can be used for data binding. |


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