Both WebClient and directory are powerful.

RX:

/* System. net. use of WebClient * system. net. webClient mywebclient = new system. net. webClient (); * synchronous download or asynchronous download ** synchronous download: * mywebclient. downloadfile (URL, Pagh); * after the download is complete, you can open system. diagnostics. process. start (Pagh); *** asynchronous download: * mywebclient. downloadfileasync (New uri (URL), Pagh); * you can set the event after download before download: * mywebclient. downloadfilecompleted + = new asynccompletedeventhandler (mywebclient_downloadfilecompleted ); * The event Delegate method is as follows: void mywebclient_downloadfilecompleted (Object sender, asynccompletedeventargs e) {MessageBox. show ("download completed, will be automatically opened soon"); system. diagnostics. process. start (XX); // throw new exception ("the method or operation is not implemented. ");} ** The downloading PATH variable Pagh can be set to a global variable * asynchronous downloading can perform other operations when multiple files are downloaded and large files are downloaded simultaneously, * set the download completion event. After the download is complete, the user will be notified. */

 

For the WebClient's Writing Method of winform upload and web server, see here: Portal

 

 

Directory is also very powerful

 

Introduction

// 1. obtain the current application path // The application is known before. startuppath (); // I didn't expect this to work with directory. getcurrentdirectory (); // 2. create if (directory. exists (! @ "D: \ Temp") {directory. createdirectory (@ "D: \ Temp");} // 3. create if (file. exists (! @ "D: \ temp \ temp.txt") {file. create (@ "D: \ temp \ temp.txt");} // the file can be replaced with the file below. createtext (@ "D: \ temp \ temp.txt"); // 3. delete // reload twice // a parameter indicates that only files in the target folder can be deleted. // The last parameter can be true or false. // if true, all files are deleted as false or only one Parameter only deletes all objects in the target folder and retains the subfolders directory. delete (@ "D: \ Temp"); // 4. move files or folders // move the temp folder on disk D to directory on disk E. move (@ "D: \ Temp", @ "E: \ Temp"); // obtain the Directory creation date and time directory. getcreationtime (directory. getcurrentdirectory (); // retrieves the parent directory of the specified path. getparent (directory. getcurrentdirectory (); // 5. obtain the list of files and folders in the current directory (including the names of files or folders) string [] ooxx1 = directory. getfilesystementries (directory. getcurrentdirectory (); // 6. obtain the directory list of files in the current directory (including the file name) string [] ooxx2 = directory. getfiles (directory. getcurrentdirectory (); // 7. obtain the Directory List (including the folder name) of the folder under the current directory string [] ooxx3 = directory. getdirectories (directory. getcurrentdirectory ()); // The first two parameters are reloaded. The second and third parameters are reloaded with three parameters. // The path to be queried for the first parameter. // The second parameter query character can be searched using regular expressions similar to that for computers. use *. PDF // The third parameter searchoption enumeration: // searchoption. alldirectories // search the current directory and all subdirectories // searchoption. topdirectoryonly searches for the current directory // classic msdn example: // process all files in the directory passed in, recurse on any directories/that are found, and process the files they contain. public static void processdirectory (string targetdirectory) {// process the list of files found in the directory. string [] fileentries = directory. getfiles (targetdirectory); foreach (string filename in fileentries) processfile (filename); // recurse into subdirectories of this directory. string [] subdirectoryentries = directory. getdirectories (targetdirectory); foreach (string subdirectory in subdirectoryentries) processdirectory (subdirectory);} // insert logic for processing found files here. public static void processfile (string path) {console. writeline ("processed file '{0 }'. ", PATH );}