Question

我的ViewModel有一个PrintCommand执行一个名为PrintCalendar（）的方法。但Calendar aka datagrid在View中，那么如何将我的datagrid放入ViewModel？

弄脏我的手并在代码隐藏中做所有这些事情？哦不...

PrintDialog printDlg = new PrintDialog();
printDlg.PrintVisual(datagrid, "Grid Printing.");

Answer 1

你可以试试这个。我已经设置了一个带有datagrid，buttom和ViewModel的简单演示窗口。 ViewModel包含PrintCommand（来自MVVM Light Toolkit的RelayCommand），它接受Visual（数据网格）作为命令参数。代码中没有代码，所有工作都是通过绑定完成的。

Xaml：

<Window
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:vm="clr-namespace:WpfTestApplication.ViewModel"
    x:Class="WpfTestApplication.MainWindow"
    x:Name="Window"
    Title="MainWindow"
    Width="640" Height="480">
    <Window.Resources>
        <ResourceDictionary>
            <vm:WindowViewModel x:Key="WindowViewModel"/>
        </ResourceDictionary>
    </Window.Resources>

    <Grid x:Name="LayoutRoot" DataContext="{DynamicResource WindowViewModel}">
        <DockPanel>
            <Button Content="Print" Width="70" DockPanel.Dock="Bottom" HorizontalAlignment="Right"
                    Command="{Binding PrintCommand, Mode=OneWay}" CommandParameter="{Binding ElementName=dataGrid, Mode=OneWay}" />
            <DataGrid x:Name="dataGrid" DataContext="{DynamicResource SampleDataSource}" ItemsSource="{Binding Collection}"/>
        </DockPanel>
    </Grid>
</Window>

和ViewModel：

using System.Windows.Controls;
using System.Windows.Media;
using GalaSoft.MvvmLight.Command;

namespace WpfTestApplication.ViewModel
{
    public class WindowViewModel
    {
        /// <summary>
        /// Command executed to print an visual component. The component is passed in as a parameter.
        /// </summary>
        public RelayCommand<Visual> PrintCommand
        {
            get
            {
                return new RelayCommand<Visual>( v =>
                {
                    PrintDialog printDlg = new PrintDialog();
                    printDlg.PrintVisual( v, "Grid Printing." );
                } );
            }
        }
    }
}

使用MVVM模式打印WPF Visual

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