25
SepFile upload with strongly typed view and model validation
Many times, we required to upload file with strongly-typed view and also apply validation on uploading file using data annotation validators. In this article, I would like to share, how can we upload a file and validate that file, firstly at client side and after that at server side.
How to do it..
Step 1 : Designing model with data annotation validation
public class RegistrationModel { [Required(ErrorMessage = "Please Enter Your Full Name")] [Display(Name = "Full Name")] public string Name { get; set; } [Required(ErrorMessage = "Please Enter Address")] [Display(Name = "Address")] [MaxLength(200)] public string Address { get; set; } [Required(ErrorMessage = "Please Upload File")] [Display(Name = "Upload File")] [ValidateFile] public HttpPostedFileBase file { get; set; } } //Customized data annotation validator for uploading file public class ValidateFileAttribute : ValidationAttribute { public override bool IsValid(object value) { int MaxContentLength = 1024 * 1024 * 3; //3 MB string[] AllowedFileExtensions = new string[] { ".jpg", ".gif", ".png", ".pdf" }; var file = value as HttpPostedFileBase; if (file == null) return false; else if (!AllowedFileExtensions.Contains(file.FileName.Substring(file.FileName.LastIndexOf('.')))) { ErrorMessage = "Please upload Your Photo of type: " + string.Join(", ", AllowedFileExtensions); return false; } else if (file.ContentLength > MaxContentLength) { ErrorMessage = "Your Photo is too large, maximum allowed size is : " + (MaxContentLength / 1024).ToString() + "MB"; return false; } else return true; } }
Step 2 : Designing view based on model
<h2>File upload with model validation</h2> <h3 style="color: green">@ViewBag.Message</h3> @using (Html.BeginForm("FileUpload", "Home", FormMethod.Post, new { enctype = "multipart/form-data" })) { <fieldset> <legend></legend> <ol> <li> @Html.LabelFor(m => m.Name) @Html.TextBoxFor(m => m.Name, new { maxlength = 50 }) @Html.ValidationMessageFor(m => m.Name) </li> <li> @Html.LabelFor(m => m.Address) @Html.TextAreaFor(m => m.Address, new { maxlength = 200 }) @Html.ValidationMessageFor(m => m.Address) </li> <li class="lifile"> @Html.TextBoxFor(m => m.file, new { type = "file" }) @Html.ValidationMessageFor(m => m.file) </li> </ol> <input type="submit" value="Submit" /> </fieldset> }
Step 3 : Applying jQuery validation for validating file
<script type="text/jscript"> //get file size function 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 = $("#" + fileid)[0].files[0].size //size in kb fileSize = fileSize / 1048576; //size in mb } return fileSize; } catch (e) { alert("Error is :" + e); } } //get file path from client system function getNameFromPath(strFilepath) { var objRE = new RegExp(/([^\/\\]+)$/); var strName = objRE.exec(strFilepath); if (strName == null) { return null; } else { return strName[0]; } } $(function () { $("#file").change(function () { var file = getNameFromPath($(this).val()); if (file != null) { var extension = file.substr((file.lastIndexOf('.') + 1)); switch (extension) { case 'jpg': case 'png': case 'gif': case 'pdf': flag = true; break; default: flag = false; } } if (flag == false) { $(".lifile > span").text("You can upload only jpg,png,gif,pdf extension file"); return false; } else { var size = GetFileSize('file'); if (size > 3) { $(".lifile > span").text("You can upload file up to 3 MB"); } else { $(".lifile > span").text(""); } } }); }); </script>
Step 4 : Designing Controller
public ActionResult FileUpload() { return View(); } [HttpPost] public ActionResult FileUpload(RegistrationModel mRegister) { //Check server side validation using data annotation if (ModelState.IsValid) { //TO:DO var fileName = Path.GetFileName(mRegister.file.FileName); var path = Path.Combine(Server.MapPath("~/Content/Upload"), fileName); mRegister.file.SaveAs(path); ViewBag.Message = "File has been uploaded successfully"; ModelState.Clear(); } return View(); }
How it works...



Read More Articles Related to Design patterns
What do you think?
I hope you will enjoy the tips while working with MVC. I would like to have feedback from my blog readers. Your valuable feedback, question, or comments about this article are always welcome.
Take our free skill tests to evaluate your skill!

In less than 5 minutes, with our skill test, you can identify your knowledge gaps and strengths.