WPF 自定义Command
无参Command:
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1 internal class DelegateCommand : ICommand 2 { 3 private readonly Action _execute; 4 private readonly Func<bool> _canExecute; 5 6 public DelegateCommand(Action execute) : this(execute, null) { } 7 public DelegateCommand(Action execute, Func<bool> canExecute) 8 { 9 _execute = execute ?? throw new ArgumentNullException(nameof(execute)); 10 _canExecute = canExecute; 11 } 12 13 public void Execute(object parameter) 14 { 15 _execute(); 16 } 17 public bool CanExecute(object parameter) 18 { 19 if (_canExecute == null) return true; 20 return _canExecute(); 21 } 22 23 24 public event EventHandler CanExecuteChanged 25 { 26 add => CommandManager.RequerySuggested += value; 27 remove => CommandManager.RequerySuggested -= value; 28 } 29 }
有参Command:
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1 internal class DelegateCommand<T> : ICommand 2 { 3 private readonly Action<T> _execute; 4 private readonly Func<bool> _canExecute; 5 6 public DelegateCommand(Action<T> execute) : this(execute, null) { } 7 public DelegateCommand(Action<T> execute, Func<bool> canExecute) 8 { 9 _execute = execute ?? throw new ArgumentNullException(nameof(execute)); 10 _canExecute = canExecute; 11 } 12 13 public void Execute(object parameter) 14 { 15 _execute((T)parameter); 16 } 17 public bool CanExecute(object parameter) 18 { 19 if (_canExecute == null) return true; 20 return _canExecute(); 21 } 22 23 24 public event EventHandler CanExecuteChanged 25 { 26 add => CommandManager.RequerySuggested += value; 27 remove => CommandManager.RequerySuggested -= value; 28 } 29 }
在viewmodel中,定义一个Command属性
1 Command=new DelegateCommand<string> (searchText=>{ 2 //添加逻辑 3 });
然后绑定即可。
1 <Window x:Class="WpfApp21.MainWindow" 2 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 3 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 4 xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 5 xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 6 xmlns:viewModels="clr-namespace:WpfApp21.ViewModels" 7 xmlns:local="clr-namespace:WpfApp21" 8 mc:Ignorable="d" 9 Title="MainWindow" Height="450" Width="800"> 10 <Window.DataContext> 11 <viewModels:SearchWordViewModel/> 12 </Window.DataContext> 13 <StackPanel> 14 <TextBox x:Name="InputTextBox"></TextBox> 15 <Button Command="{Binding SearchCommand}" CommandParameter="{Binding ElementName=InputTextBox,Path=Text}"></Button> 16 </StackPanel> 17 </Window>
分类:
WPF/Silverlight
标签:
WPF
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