using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

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 Printers

{

    /// <summary>

    /// Interaction logic for Window1.xaml

    /// </summary>

    public partial class Window1 : Window

    {

        public Window1()

        {

            InitializeComponent();

            InitprinterComboBox(); //初始化打印机下拉列表选项

        }

        private void InitprinterComboBox()

        {

            List<String> list = LocalPrinter.GetLocalPrinters(); //获得系统中的打印机列表

            foreach (String s in list)

            {

                printerComboBox.Items.Add(s); //将打印机名称添加到下拉框中

            }

        }

        private void printButton_Click(object sender, RoutedEventArgs e)

        {

            if (printerComboBox.SelectedItem != null) //判断是否有选中值

            {

                if (Externs.SetDefaultPrinter(printerComboBox.SelectedItem.ToString())) //设置默认打印机

                {

                    MessageBox.Show(printerComboBox.SelectedItem.ToString() + "设置为默认打印机成功！");

                }

                else

                {

                    MessageBox.Show(printerComboBox.SelectedItem.ToString() + "设置为默认打印机失败！");

                }

            }

        }

    }

}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing.Printing;
using System.Runtime.InteropServices;

namespace Printers
{
class LocalPrinter
{
private static PrintDocument fPrintDocument = new PrintDocument();
//获取本机默认打印机名称
public static String DefaultPrinter()
{
return fPrintDocument.PrinterSettings.PrinterName;
}
public static List<String> GetLocalPrinters()
{
List<String> fPrinters = new List<String>();
fPrinters.Add(DefaultPrinter()); //默认打印机始终出现在列表的第一项
foreach (String fPrinterName in PrinterSettings.InstalledPrinters)
{
if (!fPrinters.Contains(fPrinterName))
{
fPrinters.Add(fPrinterName);
}
}
return fPrinters;
}
}
}

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Runtime.InteropServices;

namespace Printers

{

    class Externs

    {

        [DllImport("winspool.drv")]

        public static extern bool SetDefaultPrinter(String Name); //调用win api将指定名称的打印机设置为默认打印机

    }

}