Class DelegateCommand<T>
Represents a command that can perform a given action.
Implements
Namespace: Syncfusion.UI.Xaml.Core
Assembly: Syncfusion.Core.WinUI.dll
Syntax
public class DelegateCommand<T> : Object, ICommandType Parameters
| Name |
|---|
| T |
Constructors
DelegateCommand(Action<T>)
Initializes a new instance of the DelegateCommand class.
Declaration
public DelegateCommand(Action<T> method)Parameters
| Type | Name | Description |
|---|---|---|
| System.Action<T> | method | The method. |
DelegateCommand(Action<T>, Predicate<T>)
Initializes a new instance of the DelegateCommand class.
Declaration
public DelegateCommand(Action<T> action, Predicate<T> canExecute)Parameters
| Type | Name | Description |
|---|---|---|
| System.Action<T> | action | The action to execute when called. |
| System.Predicate<T> | canExecute | The function to call to determine if the command can execute the action. |
Exceptions
| Type | Condition |
|---|---|
| System.ArgumentNullException | Thrown if the execute action is null. |
Methods
CanExecute(Object)
Defines the method that determines whether the command can execute in its current state.
Declaration
public bool CanExecute(object parameter)Parameters
| Type | Name | Description |
|---|---|---|
| System.Object | parameter | Data used by the command. If the command does not require data to be passed, this object can be set to null. |
Returns
| Type | Description |
|---|---|
| System.Boolean | Returns a value indicating whether this command can be executed. |
Execute(Object)
Defines the method to be called when the command is invoked.
Declaration
public void Execute(object parameter)Parameters
| Type | Name | Description |
|---|---|---|
| System.Object | parameter | Data used by the command. If the command does not require data to be passed, this object can be set to null. |
RaiseCanExecuteChanged()
Raises CanExecuteChanged event to notify changes in command status.
Declaration
public void RaiseCanExecuteChanged()Events
CanExecuteChanged
Occurs when changes occur that affect whether or not the command should execute.
Declaration
public event EventHandler CanExecuteChangedEvent Type
| Type |
|---|
| System.EventHandler |