C # customization file icon Double-click Start (Modify registry)

Custom files generated by the program, such as the suffix. Test

How does this file start to open the program directly and open the file?

1. Double-click to open

2. custom files with icon display

3. Customize the file, right click to have the corresponding property

Background code: (How to modify information in the registry)

    //Tool Startup Path    stringToolpath = System.Windows.Forms.Application.StartupPath +"\ \ Mail gadget. exe"; stringExtension =sptdconst.fileextension; stringFileType ="Email File"; stringFilecontent ="Text/plain"; //Get informationMicrosoft.Win32.RegistryKey RegistryKey =Microsoft.Win32.Registry.ClassesRoot.OpenSubKey (extension); if(RegistryKey! =NULL&& Registrykey.opensubkey ("Shell") !=NULL&& Registrykey.opensubkey ("Shell"). OpenSubKey ("Open") !=NULL&&Registrykey.opensubkey ("Shell"). OpenSubKey ("Open"). OpenSubKey ("Command") !=NULL)    {        varVarsub = Registrykey.opensubkey ("Shell"). OpenSubKey ("Open"). OpenSubKey ("Command"); varVarvalue = Varsub.getvalue (""); if(Object.Equals (varvalue, Toolpath +"%1"))        {            return; }    }    //DeleteMicrosoft.Win32.Registry.ClassesRoot.DeleteSubKeyTree (Extension,false); //File RegistrationRegistryKey =Microsoft.Win32.Registry.ClassesRoot.CreateSubKey (extension); RegistryKey.SetValue ("File Type", FileType); RegistryKey.SetValue ("Content Type", filecontent); //Set default iconMicrosoft.Win32.RegistryKey Iconkey = Registrykey.createsubkey ("DefaultIcon"); Iconkey.setvalue ("", System.Windows.Forms.Application.StartupPath +"\\logo.ico"); //Set default open program pathRegistryKey = Registrykey.createsubkey ("Shell\\open\\command"); RegistryKey.SetValue ("", Toolpath +"%1"); //CloseRegistrykey.close ();

After you have modified the registry information, double-click the file to start the software, and then how to operate in the code?

 // If a space exists in the original path, it will be decomposed into multiple elements if0) {      string  FilePath = String.Join ("", E.args.toarray ());       New FileInfo (FilePath);       if (file. Exists)       {           = file. FullName;       }  }

You can then determine whether the Doubleclicksptdfilepath has a value in the main program loaded method, and if so, get the file under the path and proceed.

C # customization file icon Double-click Start (Modify registry)