WPF 简单文本编辑器

这与注释的部分二选一

<Window.CommandBindings>
        <CommandBinding Command="ApplicationCommands.Save"
                        Executed="SaveCommand_Executed"  CanExecute="SaveCommand_CanExecute"></CommandBinding>
</Window.CommandBindings>

菜单栏

<Menu Grid.Row="0">
            <MenuItem Header="File">
                <MenuItem Command="New"></MenuItem>
                <MenuItem Command="Open"></MenuItem>
                <MenuItem Command="Save"></MenuItem>
                <MenuItem Command="SaveAs"></MenuItem>
                <Separator></Separator>
                <MenuItem Command="Close"></MenuItem>
            </MenuItem>
</Menu>

工具栏

<ToolBarTray Grid.Row="1">
            <ToolBar>
                <Button Command="New">New</Button>
                <Button Command="Open">Open</Button>
                <Button Command="Save">Save</Button>
            </ToolBar>
            <ToolBar>
                <Button Command="Cut">Cut</Button>
                <Button Command="Copy">Copy</Button>
                <Button Command="Paste">Paste</Button>
            </ToolBar>
</ToolBarTray>

文本框

<TextBox Name="txt" Margin="5" Grid.Row="2" TextWrapping="Wrap" AcceptsReturn="True" TextChanged="txt_TextChanged"></TextBox>

代码（绑定部分）

CommandBinding binding;
binding = new CommandBinding(ApplicationCommands.New);
binding.Executed += NewCommand;
this.CommandBindings.Add(binding);

binding = new CommandBinding(ApplicationCommands.Open);
binding.Executed += OpenCommand;
this.CommandBindings.Add(binding);

//binding = new CommandBinding(ApplicationCommands.Save);
//binding.Executed += SaveCommand_Executed;
//binding.CanExecute += SaveCommand_CanExecute;
//this.CommandBindings.Add(binding);

设置一个bool量，表示是否文本有变化

private bool isDirty = false;

命令

private void NewCommand(object sender, ExecutedRoutedEventArgs e)
{
    MessageBox.Show("New command triggered with " + e.Source.ToString());
    isDirty = false;
}
private void OpenCommand(object sender, ExecutedRoutedEventArgs e)
{
    isDirty = false;
}
private void SaveCommand_Executed(object sender, ExecutedRoutedEventArgs e)
{
    MessageBox.Show("Save command triggered with " + e.Source.ToString());
    isDirty = false;
}

private void txt_TextChanged(object sender, RoutedEventArgs e)
{
    isDirty = true;
}
private void SaveCommand_CanExecute(object sender, CanExecuteRoutedEventArgs e)
{
    e.CanExecute = isDirty;
}