. Net generic File Upload class (large files can be uploaded and 480 MB has been tried locally)

. ASPX page

<Asp: Image id = "imglogo" runat = "server"/> <br/> <asp: label id = "labmsg" runat = "server" forecolor = "# cc0000"> </ASP: Label> <br/> <asp: fileupload id = "uploadlogo" runat = "server" width = "60%" Height = "22px"/> <asp: button id = "btnupload" runat = "server" text = "Upload" onclick = "btnupload_click"/>

. Aspx. CS page 

// Upload button protected void btnupload_click (Object sender, eventargs e) {uploadfile uploadfileobj = new uploadfile (); // instantiate the object upload class uploadfileobj. maxfilesize = 100; // sets the maximum length of the uploaded file, in the unit of K uploadfileobj. filetype = "JPG | JPEG | GIF | PNG"; // you can specify the file type to be uploaded. String uploadpath = server. mappath ("~ /Uploadfiles/other/"); // sets the full upload directory path uploadfileobj. uploadfilego (uploadpath, uploadlogo); // File Upload labmsg. TEXT = uploadfileobj. uploadinfo; // If (uploadfileobj. uploadstate = true) {imglogo. imageurl = "~ /Uploadfiles/other/"+ uploadfileobj. newfilename; // display image }}

Uploadfile. CS File Upload class

Using system; using system. data; using system. configuration; using system. web; using system. web. security; using system. web. ui; using system. web. UI. webcontrols; using system. web. UI. webcontrols. webparts; using system. web. UI. htmlcontrols; using system. io; namespace common {// <summary> File Upload class </Summary> public class uploadfile {# region field private string _ uploadinfo; // return information of file upload. Private bool _ uploadstate; // The returned status of file upload. Private string _ filetype; // The type of the file to be uploaded. Private int _ filesize; // the size of the uploaded file, in the unit of B private int _ maxfilesize; // the maximum length of the uploaded file, in the unit of B private string _ newfilename; // name of the uploaded file. # Endregion // <summary> initial File Upload class (default) </Summary> Public uploadfile () {_ uploadinfo = "NONE"; _ uploadstate = false; _ filetype = "*"; _ maxfilesize = 1024000; // 1000 K is 1024 * 1000b, in the unit of B _ newfilename = "";} # region attributes // <summary> returned information for file upload </Summary> Public String uploadinfo {set {_ uploadinfo = value ;}get {return _ uploadinfo ;}} /// <summary> the returned status of the object upload. The value true indicates that the object is successfully uploaded. The value false indicates that the object fails to be uploaded. </Summary> Public bool uploadstate {Set {_ uploadstate = value;} get {return _ uploadstate; }}// <summary> specifies the type of the file to be uploaded. * by default, it indicates any type or custom type, for example, "JPG | GIF | BMP" </Summary> Public String filetype {set {_ filetype = value;} get {return _ filetype ;}} /// <summary> size of the uploaded file, in the unit of K </Summary> Public int filesize {get {return _ filesize/1024 ;}} /// <summary> Maximum length of the size of the uploaded file, in the unit of K </Summary> Public int maxfilesize {set {_ maxfilesize = value * 1024;} Get {return _ maxfilesize/1024 ;}/// <summary> uploaded file name </Summary> Public String newfilename {set {_ newfilename = value ;} get {return _ newfilename ;}} # endregion # region upload main program // <summary> upload local files to the server </Summary> // <Param name = "strsavedir"> physical path saved on the server. </Param> // <Param name = "fileuploadctrlid"> specifies the object to be uploaded. The fileupload control is used here, </param> // <param> If the second parameter is an HTML input (File) control, you can change it: htmlinputfile htmctrlobjuploadfile </param> // <returns> </returns> Public void uploadfilego (string strsavedir, fileupload fileuploadctrlid) {int intfileextpoint = fileuploadctrlid. postedfile. filename. lastindexof (". "); // the last one. string strfileextname = fileuploadctrlid. posted File. filename. substring (intfileextpoint + 1). tolower (); // get the suffix of the uploaded file. _ Filesize = fileuploadctrlid. postedfile. contentlength; // the size of the uploaded file (byte if (_ filesize = 0) // determine whether a file needs to be uploaded or whether the selected file is 0 bytes. {_ Uploadinfo = "the file to be uploaded is not selected or the selected file size is 0 bytes"; _ uploadstate = false; return; // The File Upload Status and information are returned.} If (_ filesize> _ maxfilesize) // limit the size of the file to be uploaded (byte ). {_ Uploadinfo = "the size of the uploaded file exceeds the limit (" + (_ maxfilesize/1024 ). tostring () + "k)"; _ uploadstate = false; return; // returns the File Upload Status and information.} If (_ filetype! = "*") {If (_ filetype. tolower (). indexof (strfileextname. tolower (). trim () =-1) // determines whether the file type to be uploaded is within the permitted range. {_ Uploadinfo = "file type that cannot be uploaded (allowed type: |" + _ filetype + ")"; _ uploadstate = false; return; // returned File Upload Status and information} If (_ newfilename = "") {datetime dtenow = datetime. now; // defines the date object, which is the name of the uploaded file. _ Newfilename = dtenow. year. tostring () + dtenow. month. tostring () + dtenow. day. tostring () + getrandomstr (8); // randomly name the uploaded file, date + random number. _ Newfilename = _ newfilename + ". "+ strfileextname; // file name containing the extension} fileuploadctrlid. postedfile. saveas (this. getsavedirectory (strsavedir) + _ newfilename); // Save the uploaded file to the specified physical path with a new file name. _ Uploadinfo = "File Uploaded successfully"; // return the physical path of the uploaded Server File. _ Uploadstate = true ;}# endregion /// <summary> obtain the random number of digits </Summary> /// <Param name = "rndnumcount"> the number of digits of the random number. </Param> // <returns> </returns> private string getrandomstr (INT rndnumcount) {string randomstr; randomstr = ""; random RND = new random (); for (INT I = 1; I <= rndnumcount; I ++) {randomstr + = RND. next (0, 9 ). tostring ();} return randomstr ;} /// <summary> obtain the physical path of the uploaded file storage directory </Summary> /// <Param name = "directorypath">. </Param> /// <returns> returns the directory where the file is stored. </Returns> Public String getsavedirectory (string directorypath) {If (! Directory. exists (directorypath) // checks whether the current directory exists. {Directory. createdirectory (directorypath); // create a directory for storing uploaded files.} Return directorypath ;}# region attachment: Modify the upload size configuration/* in c: \ windows \ Microsoft. in the net \ framework \ v1.1.4322 \ config directory, find the file maxrequestlength = "4096" and increase the value. For example: 102400 the unit of this parameter should be kb. The above method is to modify the global. If you need to modify a project, it is to modify the web in the project. in the <system. web> </system. web>,