修改电脑的默认打印机

using System.Management;

  private ManagementObjectSearcher query;
  private ManagementObjectCollection queryCollection;
  string _classname="SELECT * FROM Win32_Printer";

 query=new ManagementObjectSearcher(_classname);           
 queryCollection = query.Get();

 foreach (ManagementObject mo in queryCollection)
 {       
    if (string.Compare(mo["Name"].ToString(),PrinterName,true)==0)
    {
        mo.InvokeMethod("SetDefaultPrinter",null);
        break;
    }
 }

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ListViewItem lvi = new ListViewItem(mo["Name"].ToString());
this.listView1.Items.Add(lvi);