C # Setting the default printer

Project, you need to select a printer and switch the printer. The demo is as follows (WPF application):

Xaml:

<Windowx:class= "Printersapp.mainwindow"xmlns= "Http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x= "Http://schemas.microsoft.com/winfx/2006/xaml"Title= "MainWindow"Height= " the"Width= "525">    <Grid>        <StackPanel>            <ComboBoxx:name= "Printercombobox"/>            <ButtonContent= "Set as printer"Click= "Setdefaultprintbtn"/>        </StackPanel>    </Grid></Window>

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Printer Localprinter class:

  Public classLocalPrinter {Private StaticPrintDocument fprintdocument =NewPrintDocument (); //get the native default printer name         Public StaticString Defaultprinter () {returnFPrintDocument.PrinterSettings.PrinterName; }         Public StaticList<string>getlocalprinters () {List<String> fprinters =NewList<string>(); Fprinters.add (Defaultprinter ()); //The default printer always appears in the first item in the list            foreach(String Fprinternameinchprintersettings.installedprinters) {if(!fprinters.contains (Fprintername))                {Fprinters.add (fprintername); }            }            returnfprinters; }    }

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Win API:

   Public class externs   {       [DllImport ("winspool.drv")]       public  Staticexternbool// call the win API to set the specified name of the printer as the default printer   }

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Logic code:

   /// <summary>    ///the interactive logic of MainWindow.xaml/// </summary>     Public Partial classMainwindow:window { PublicMainWindow () {InitializeComponent (); Initprintercombobox (); //Initialize printer drop-down list options        }        Private voidInitprintercombobox () {List<String> list = Localprinter.getlocalprinters ();//get a list of printers in the system            foreach(String sinchlist) {PRINTERCOMBOBOX.ITEMS.ADD (s);//Add the printer name to the drop-down box            }        }        Private voidSETDEFAULTPRINTBTN (Objectsender, RoutedEventArgs e) {            if(Printercombobox.selecteditem! =NULL)//determine if there are any selected values            {                if(Externs.setdefaultprinter (PrinterComboBox.SelectedItem.ToString ()))//Set the default printer{MessageBox.Show (printerComboBox.SelectedItem.ToString ()+"Set the default printer to success! "); }                Else{MessageBox.Show (printerComboBox.SelectedItem.ToString ()+"Set as default printer failed! "); }            }        }    }

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Run:

Drop down ComboBox, select the printer you want to set as the default, click the "Set as Default Printer" button to set the success:

C # Setting the default printer