Set Default Printer use C# code( 利用C# 代码设置默认的打印机)

  //set default printer function 
        public void setDefaultPrint() 
        { 
            ManagementObjectSearcher query; 
            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(), "Microsoft XPS Document Writer", true) == 0) 
                { 
                    mo.InvokeMethod("SetDefaultPrinter", null); 
                    break; 
                } 
            } 
        }

This code must reference System.Management, otherwise this code will show error.