Uploading a file in Asp.Net MVC application is very easy. The posted file is automatically available as a HttpPostedFileBase parameters in the action of the controler. For uploading a file on the server you required to have a file input control with in html form having encoding type set to multipart/form-data. The default encoding type of a form is application/x-www-form-urlencoded and this is no sufficient for posting a large amount of data to server.
How to do it..
Step 1 : Form for uploading the file
@using (Html.BeginForm("FileUpload", "Home", FormMethod.Post, new { enctype = "multipart/form-data" })){ @Html.ValidationSummary(); <ol> <li class="lifile"> <input type="file" id="fileToUpload" name="file" /> <span class="field-validation-error" id="spanfile"></span> </li> </ol> <input type="submit" id="btnSubmit" value="Upload" />}
Step 2 : Validating the file on client side
<script type="text/jscript"> //get file sizefunction GetFileSize(fileid) { try { var fileSize = 0; //for IE if ($.browser.msie) { //before making an object of ActiveXObject, //please make sure ActiveX is enabled in your IE browser var objFSO = new ActiveXObject("Scripting.FileSystemObject"); var filePath = $("#" + fileid)[0].value; var objFile = objFSO.getFile(filePath); var fileSize = objFile.size; //size in kb fileSize = fileSize / 1048576; //size in mb } //for FF, Safari, Opeara and Others else { fileSize = $("#" + fileid)[0].files[0].size //size in kb fileSize = fileSize / 1048576; //size in mb } return fileSize; } catch (e) { alert("Error is :" + e); }} //get file path from client systemfunction getNameFromPath(strFilepath) { var objRE = new RegExp(/([^\/\\]+)$/); var strName = objRE.exec(strFilepath); if (strName == null) { return null; } else { return strName[0]; }} $("#btnSubmit").live("click", function () { if ($('#fileToUpload').val() == "") { $("#spanfile").html("Please upload file"); return false; } else { return checkfile(); }}); function checkfile() { var file = getNameFromPath($("#fileToUpload").val()); if (file != null) { var extension = file.substr((file.lastIndexOf('.') + 1)); // alert(extension); switch (extension) { case 'jpg': case 'png': case 'gif': case 'pdf': flag = true; break; default: flag = false; } } if (flag == false) { $("#spanfile").text("You can upload only jpg,png,gif,pdf extension file"); return false; } else { var size = GetFileSize('fileToUpload'); if (size > 3) { $("#spanfile").text("You can upload file up to 3 MB"); return false; } else { $("#spanfile").text(""); } }} $(function () { $("#fileToUpload").change(function () { checkfile();});});</script>
Step 3 : Controller's action for receiving the posted file
[HttpPost]public ActionResult FileUpload(HttpPostedFileBase file){ if (ModelState.IsValid) { if (file == null) { ModelState.AddModelError("File", "Please Upload Your file"); } else if (file.ContentLength > 0) { int MaxContentLength = 1024 * 1024 * 3; //3 MB string[] AllowedFileExtensions = new string[] { ".jpg", ".gif", ".png", ".pdf" }; if (!AllowedFileExtensions.Contains(file.FileName.Substring(file.FileName.LastIndexOf('.')))) { ModelState.AddModelError("File", "Please file of type: " + string.Join(", ", AllowedFileExtensions)); } else if (file.ContentLength > MaxContentLength) { ModelState.AddModelError("File", "Your file is too large, maximum allowed size is: " + MaxContentLength + " MB"); } else { //TO:DO var fileName = Path.GetFileName(file.FileName); var path = Path.Combine(Server.MapPath("~/Content/Upload"), fileName); file.SaveAs(path); ModelState.Clear(); ViewBag.Message = "File uploaded successfully"; } } } return View();}
How it works...
转载于:https://www.cnblogs.com/njl041x/p/4148723.html
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