C#如何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; } }