markus / ConvertService / ServiceBase / Markus.Mvvm.ToolKit / AsyncCommand / AsyncCommand.cs @ f5d5b1ea
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using System; |
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using System.Threading.Tasks; |
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using System.Windows.Input; |
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namespace Markus.Mvvm.ToolKit |
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{
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public class AsyncCommand : IAsyncCommand |
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{
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public event EventHandler CanExecuteChanged; |
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private bool _isExecuting; |
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private readonly Func<Task> _execute; |
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private readonly Func<bool> _canExecute; |
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private readonly IErrorHandler _errorHandler; |
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public AsyncCommand( |
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Func<Task> execute, |
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Func<bool> canExecute = null, |
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IErrorHandler errorHandler = null) |
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{
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_execute = execute; |
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_canExecute = canExecute; |
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_errorHandler = errorHandler; |
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} |
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public bool CanExecute() |
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{
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return !_isExecuting && (_canExecute?.Invoke() ?? true); |
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} |
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public async Task ExecuteAsync() |
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{
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if (CanExecute()) |
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{
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try |
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{
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_isExecuting = true; |
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await _execute(); |
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} |
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finally |
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{
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_isExecuting = false; |
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} |
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} |
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RaiseCanExecuteChanged(); |
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} |
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public void RaiseCanExecuteChanged() |
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{
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CanExecuteChanged?.Invoke(this, EventArgs.Empty); |
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} |
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#region Explicit implementations |
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bool ICommand.CanExecute(object parameter) |
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{
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return CanExecute(); |
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} |
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void ICommand.Execute(object parameter) |
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{
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ExecuteAsync().FireAndForgetSafeAsync(_errorHandler); |
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} |
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#endregion |
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} |
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public class AsyncCommand<T> : IAsyncCommand<T> |
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{
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public event EventHandler CanExecuteChanged; |
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private bool _isExecuting; |
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private readonly Func<T, Task> _execute; |
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private readonly Func<T, bool> _canExecute; |
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private readonly IErrorHandler _errorHandler; |
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public AsyncCommand(Func<T, Task> execute, Func<T, bool> canExecute = null, IErrorHandler errorHandler = null) |
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{
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_execute = execute; |
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_canExecute = canExecute; |
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_errorHandler = errorHandler; |
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} |
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public bool CanExecute(T parameter) |
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{
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return !_isExecuting && (_canExecute?.Invoke(parameter) ?? true); |
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} |
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public async Task ExecuteAsync(T parameter) |
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{
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if (CanExecute(parameter)) |
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{
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try |
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{
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_isExecuting = true; |
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await _execute(parameter); |
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} |
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finally |
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{
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_isExecuting = false; |
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} |
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} |
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RaiseCanExecuteChanged(); |
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} |
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public void RaiseCanExecuteChanged() |
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{
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CanExecuteChanged?.Invoke(this, EventArgs.Empty); |
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} |
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#region Explicit implementations |
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bool ICommand.CanExecute(object parameter) |
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{
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return CanExecute((T)parameter); |
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} |
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void ICommand.Execute(object parameter) |
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{
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ExecuteAsync((T)parameter).FireAndForgetSafeAsync(_errorHandler); |
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} |
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#endregion |
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} |
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} |
