使用MVVM模式打印WPF视觉 [英] Print WPF Visuals with MVVM pattern

问题描述

我的ViewModel有一个PrintCommand执行一个名为PrintCalendar（）的方法。但是日历又名datagrid在View中，那么如何让我的datagrid进入ViewModel？

My ViewModel has a PrintCommand executing a Method called PrintCalendar(). But the Calendar aka datagrid is in the View, so how do I get my datagrid into the ViewModel?

让我的手变脏，做代码隐藏的所有东西？哦不...

Getting my hands dirty and do all that stuff in code-behind? oh no...

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

推荐答案

你可以尝试这个。我已经设置了一个简单的演示窗口，包含一个datagrid，一个buttom和一个ViewModel。 ViewModel包含PrintCommand（来自 MVVM Light Toolkit 的RelayCommand），它接受Visual（ datagrid）作为命令参数。代码背后没有代码，所有的工作都是通过绑定完成的。

You could try this. I have set up a simple demo window with a datagrid, a buttom and a ViewModel. The ViewModel contains the PrintCommand (a RelayCommand from the MVVM Light Toolkit) which accepts a Visual (the datagrid) as the command parameter. There is no code in the code behind all the work is done via binding.

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：

and the 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." );
                } );
            }
        }
    }
}

这篇关于使用MVVM模式打印WPF视觉的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！