XAML显示安装打印机的默认设置

Question

<UserControl x:Class="MyApp.PrinterSelection"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:Printing="clr-namespace:System.Drawing.Printing;assembly=System.Drawing"
             xmlns:local="clr-namespace:MyApp"
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300">
<Grid>
        <ListBox x:Name="displayInstalledPrinterListView" HorizontalAlignment="Left" Height="311" Margin="10,0,0,0" VerticalAlignment="Top" Width="499" ItemsSource="{x:Static Printing:PrinterSettings.InstalledPrinters}" SelectionChanged="displayInstalledPrinterListView_SelectionChanged" AlternationCount="2" FontSize="16"/>
    </Grid>

如何指示使用XAML中的ListBox中的哪个打印机是默认打印机。如果不可能使用XAML执行此操作，那么最好的方法是什么？

我知道我可以按编程检查每个打印机，以查看ISDEFAULTPRINTER是否为TRUE。但是，我想知道是否可以使用XAML（仅）

Answer 1

对我来说还不清楚您遇到麻烦的，或者您希望如何更改打印机名称的视觉显示。因此，这是仅XAML实现的通用示例，它显示了所有已安装的打印机，以及当前默认打印机的名称：

<Window x:Class="TestSO30225596DefaultPrinter.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:Printing="clr-namespace:System.Printing;assembly=System.Printing"
        Title="MainWindow" Height="350" Width="525">
  <Window.Resources>
    <Printing:LocalPrintServer x:Key="localPrintServer1"/>
    <ObjectDataProvider x:Key="printerCollection"
                        ObjectInstance="{StaticResource localPrintServer1}"
                        MethodName="GetPrintQueues">
      <ObjectDataProvider.MethodParameters>
        <x:ArrayExtension Type="{x:Type Printing:EnumeratedPrintQueueTypes}">
          <Printing:EnumeratedPrintQueueTypes>Local</Printing:EnumeratedPrintQueueTypes>
          <Printing:EnumeratedPrintQueueTypes>Connections</Printing:EnumeratedPrintQueueTypes>
        </x:ArrayExtension>
      </ObjectDataProvider.MethodParameters>
    </ObjectDataProvider>
  </Window.Resources>
  <Grid>
    <Grid.RowDefinitions>
      <RowDefinition Height="*"/>
      <RowDefinition Height="Auto"/>
    </Grid.RowDefinitions>
    <ListBox x:Name="displayInstalledPrinterListView"
             HorizontalAlignment="Left" VerticalAlignment="Top"
             Height="311" Width="499" Margin="10,0,0,0"
             ItemsSource="{Binding Source={StaticResource printerCollection}}"
             AlternationCount="2" FontSize="16">
      <ListBox.ItemTemplate>
        <DataTemplate>
          <StackPanel Orientation="Horizontal">
            <TextBlock Text="{Binding Name}"/>
          </StackPanel>
        </DataTemplate>
      </ListBox.ItemTemplate>
    </ListBox>
    <StackPanel Orientation="Horizontal" Grid.Row="1">
      <TextBlock Text="Default Printer: "/>
      <TextBlock Text="{Binding Source={StaticResource localPrintServer1}, Path=DefaultPrintQueue.Name}"/>
    </StackPanel>
  </Grid>
</Window>

请注意，您需要添加对WPF兼容的System.Printing.dll组件的引用。上面的技术从技术上符合您的广泛规范，即它确实表明（通过ListBox下方显示的文本）哪个打印机是默认的。

我相信上面的示例，您可以通过使用DefaultPrintQueue.Name属性值与每张打印机的实际名称进行比较，并提出您认为最适合的迹象。<<<<<<<<<<

Answer 2

您可以使用以下代码：

XAML：

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:WpfApplication1"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <ComboBox HorizontalAlignment="Center" VerticalAlignment="Center" ItemsSource="{Binding Printers}">
            <ComboBox.ItemTemplate>
                <DataTemplate DataType="{x:Type local:PrinterWrapper}">
                    <Grid>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="Auto"/>
                            <ColumnDefinition Width="*"/>
                        </Grid.ColumnDefinitions>
                        <TextBlock Text="Default - " x:Name="default" Visibility="Collapsed"/>
                        <TextBlock Text="{Binding PrinterName}" Grid.Column="1" />
                    </Grid>
                    <DataTemplate.Triggers>
                        <DataTrigger Binding="{Binding IsDefaultPrinter}" Value="True">
                            <Setter TargetName="default" Property="Visibility" Value="Visible"/>
                        </DataTrigger>
                    </DataTemplate.Triggers>
                </DataTemplate>
            </ComboBox.ItemTemplate>
        </ComboBox>
    </Grid>
</Window>

代码背后：

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Printing;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace WpfApplication1
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            this.DataContext = new ViewModel();
        }
    }
    public class ViewModel
    {
        public ObservableCollection<PrinterWrapper> Printers { get; set; }
        public ViewModel()
        {
            this.Printers = new ObservableCollection<PrinterWrapper>();
            LocalPrintServer server = new LocalPrintServer();
            var printQueues = server.GetPrintQueues(new EnumeratedPrintQueueTypes[] { EnumeratedPrintQueueTypes.Local, EnumeratedPrintQueueTypes.Connections });
            foreach (var printQueue in printQueues)
            {
                var printerWrapper = new PrinterWrapper();
                printerWrapper.PrinterName = printQueue.Name;
                printerWrapper.IsDefaultPrinter = (printQueue.Name == server.DefaultPrintQueue.Name);
                this.Printers.Add(printerWrapper);
            }
            server.Dispose(); // Depends on you :-)
        }
    }
    public class PrinterWrapper
    {
        public string PrinterName { get; set; }
        public bool IsDefaultPrinter { get; set; }
    }
}

注意：PrinterWrapper类可用于容纳更多打印机相关的属性，在ViewModel中，您可以编写打印逻辑。另外，您不仅可以在默认打印机名称之前显示文本默认值，还可以使用一些图像或其他一些花哨的东西。