Html helper for input type file

Question

Is there a HTMLHelper for file upload  Specifically  I am looking for a replace of   lt input type  file   gt    using ASP NET MVC HTMLHelper    Or  If I use   using  Html BeginForm       What is the HTML control for the file upload

User · Answer

To use BeginForm  here s the way to use it    using Html BeginForm  uploadfiles     home   FormMethod POST  new Dictionary lt string  object gt      type    file

User · Answer

This also works   Model   public class ViewModel                public HttpPostedFileBase File  get  set        View    using  Html BeginForm  Action    Controller   FormMethod Post  new                                           enctype    multipart form-data             Html TextBoxFor m   gt  m File  new   type    file                Controller action    HttpPost  public ActionResult Action ViewModel model        if  ModelState IsValid                var postedFile   Request Files  File               now you can get and validate the file type          var isFileSupported  IsFileSupported postedFile             public bool IsFileSupported HttpPostedFileBase file                                var isSupported   false                   switch  file ContentType                                         case   image gif                            isSupported   true                          break                       case   image jpeg                            isSupported   true                          break                       case   image png                            isSupported   true                          break                        case   audio mp3                              isSupported   true                          break                       case   audio wav                              isSupported   true                          break                                                                      return isSupported                  List of contentTypes

User · Answer

I had this same question a while back and came across one of Scott Hanselman s posts   Implementing HTTP File Upload with ASP NET MVC including Tests and Mocks  Hope this helps

User · Answer

To use BeginForm  here s the way to use it    using Html BeginForm  uploadfiles     home   FormMethod POST  new Dictionary lt string  object gt      type    file

User · Answer

Or you could do it properly   In your HtmlHelper Extension class   public static MvcHtmlString FileFor lt TModel  TProperty gt  this HtmlHelper lt TModel gt  helper  Expression lt Func lt TModel  TProperty gt  gt  expression                return helper FileFor expression  null          public static MvcHtmlString FileFor lt TModel  TProperty gt  this HtmlHelper lt TModel gt  helper  Expression lt Func lt TModel  TProperty gt  gt  expression  object htmlAttributes                var builder   new TagBuilder  input             var id   helper ViewContext ViewData TemplateInfo GetFullHtmlFieldName ExpressionHelper GetExpressionText expression            builder GenerateId id           builder MergeAttribute  name   id           builder MergeAttribute  type    file             builder MergeAttributes new RouteValueDictionary htmlAttributes                Render tag         return MvcHtmlString Create builder ToString TagRenderMode SelfClosing            This line   var id   helper ViewContext ViewData TemplateInfo GetFullHtmlFieldName ExpressionHelper GetExpressionText expression      Generates an id unique to the model  you know in lists and stuff  model 0  Name etc   Create the correct property in the model   public HttpPostedFileBase NewFile   get  set      Then you need to make sure your form will send files    using  Html BeginForm  Action    Controller   FormMethod Post  new   enctype    multipart form-data        Then here s your helper    Html FileFor x   gt  x NewFile

User · Answer

HTML Upload File ASP MVC 3   Model   Note that FileExtensionsAttribute is available in MvcFutures  It will validate file extensions client side and server side    public class ViewModel        Required  Microsoft Web Mvc FileExtensions Extensions    csv                 ErrorMessage    Specify a CSV file   Comma-separated values         public HttpPostedFileBase File   get  set        HTML View    using  Html BeginForm  Action    Controller   FormMethod Post  new                                           enctype    multipart form-data             Html TextBoxFor m   gt  m File  new   type    file          Html ValidationMessageFor m   gt  m File      Controller action    HttpPost  public ActionResult Action ViewModel model        if  ModelState IsValid                   Use your file here         using  MemoryStream memoryStream   new MemoryStream                          model File InputStream CopyTo memoryStream

User · Answer

I had this same question a while back and came across one of Scott Hanselman s posts   Implementing HTTP File Upload with ASP NET MVC including Tests and Mocks  Hope this helps

User · Answer

To use BeginForm  here s the way to use it    using Html BeginForm  uploadfiles     home   FormMethod POST  new Dictionary lt string  object gt      type    file

User · Answer

I had this same question a while back and came across one of Scott Hanselman s posts   Implementing HTTP File Upload with ASP NET MVC including Tests and Mocks  Hope this helps

User · Answer

HTML Upload File ASP MVC 3   Model   Note that FileExtensionsAttribute is available in MvcFutures  It will validate file extensions client side and server side    public class ViewModel        Required  Microsoft Web Mvc FileExtensions Extensions    csv                 ErrorMessage    Specify a CSV file   Comma-separated values         public HttpPostedFileBase File   get  set        HTML View    using  Html BeginForm  Action    Controller   FormMethod Post  new                                           enctype    multipart form-data             Html TextBoxFor m   gt  m File  new   type    file          Html ValidationMessageFor m   gt  m File      Controller action    HttpPost  public ActionResult Action ViewModel model        if  ModelState IsValid                   Use your file here         using  MemoryStream memoryStream   new MemoryStream                          model File InputStream CopyTo memoryStream

User · Answer

This is a little hacky I guess  but it results in the correct validation attributes etc being applied   Html Raw Html TextBoxFor m   gt  m File  ToHtmlString   Replace  type   text      type   file

User · Answer

Or you could do it properly   In your HtmlHelper Extension class   public static MvcHtmlString FileFor lt TModel  TProperty gt  this HtmlHelper lt TModel gt  helper  Expression lt Func lt TModel  TProperty gt  gt  expression                return helper FileFor expression  null          public static MvcHtmlString FileFor lt TModel  TProperty gt  this HtmlHelper lt TModel gt  helper  Expression lt Func lt TModel  TProperty gt  gt  expression  object htmlAttributes                var builder   new TagBuilder  input             var id   helper ViewContext ViewData TemplateInfo GetFullHtmlFieldName ExpressionHelper GetExpressionText expression            builder GenerateId id           builder MergeAttribute  name   id           builder MergeAttribute  type    file             builder MergeAttributes new RouteValueDictionary htmlAttributes                Render tag         return MvcHtmlString Create builder ToString TagRenderMode SelfClosing            This line   var id   helper ViewContext ViewData TemplateInfo GetFullHtmlFieldName ExpressionHelper GetExpressionText expression      Generates an id unique to the model  you know in lists and stuff  model 0  Name etc   Create the correct property in the model   public HttpPostedFileBase NewFile   get  set      Then you need to make sure your form will send files    using  Html BeginForm  Action    Controller   FormMethod Post  new   enctype    multipart form-data        Then here s your helper    Html FileFor x   gt  x NewFile

User · Answer

To use BeginForm  here s the way to use it    using Html BeginForm  uploadfiles     home   FormMethod POST  new Dictionary lt string  object gt      type    file

User · Answer

This also works   Model   public class ViewModel                public HttpPostedFileBase File  get  set        View    using  Html BeginForm  Action    Controller   FormMethod Post  new                                           enctype    multipart form-data             Html TextBoxFor m   gt  m File  new   type    file                Controller action    HttpPost  public ActionResult Action ViewModel model        if  ModelState IsValid                var postedFile   Request Files  File               now you can get and validate the file type          var isFileSupported  IsFileSupported postedFile             public bool IsFileSupported HttpPostedFileBase file                                var isSupported   false                   switch  file ContentType                                         case   image gif                            isSupported   true                          break                       case   image jpeg                            isSupported   true                          break                       case   image png                            isSupported   true                          break                        case   audio mp3                              isSupported   true                          break                       case   audio wav                              isSupported   true                          break                                                                      return isSupported                  List of contentTypes

User · Answer

You can also use    using  Html BeginForm  Upload    File   FormMethod Post  new   enctype    multipart form-data              lt p gt           lt input type  file  id  fileUpload  name  fileUpload  size  23    gt       lt  p gt       lt p gt           lt input type  submit  value  Upload file    gt  lt  p gt

User · Answer

I had this same question a while back and came across one of Scott Hanselman s posts   Implementing HTTP File Upload with ASP NET MVC including Tests and Mocks  Hope this helps

User · Answer

You can also use    using  Html BeginForm  Upload    File   FormMethod Post  new   enctype    multipart form-data              lt p gt           lt input type  file  id  fileUpload  name  fileUpload  size  23    gt       lt  p gt       lt p gt           lt input type  submit  value  Upload file    gt  lt  p gt

User · Answer

This is a little hacky I guess  but it results in the correct validation attributes etc being applied   Html Raw Html TextBoxFor m   gt  m File  ToHtmlString   Replace  type   text      type   file

User · Answer

Improved version of Paulius Zaliaduonis  answer   In order to make the validation work properly I had to change the Model to   public class ViewModel         public HttpPostedFileBase File   get  set              Required ErrorMessage  A header image is required    FileExtensions ErrorMessage    Please upload an image file             public string FileName                       get                               if  File    null                      return File FileName                  else                     return String Empty                              and the view to    using  Html BeginForm  Action    Controller   FormMethod Post  new                                           enctype    multipart form-data             Html TextBoxFor m   gt  m File  new   type    file          Html ValidationMessageFor m   gt  m FileName      This is required because what  Serj Sagan wrote about FileExtension attribute working only with strings

User · Answer

Improved version of Paulius Zaliaduonis  answer   In order to make the validation work properly I had to change the Model to   public class ViewModel         public HttpPostedFileBase File   get  set              Required ErrorMessage  A header image is required    FileExtensions ErrorMessage    Please upload an image file             public string FileName                       get                               if  File    null                      return File FileName                  else                     return String Empty                              and the view to    using  Html BeginForm  Action    Controller   FormMethod Post  new                                           enctype    multipart form-data             Html TextBoxFor m   gt  m File  new   type    file          Html ValidationMessageFor m   gt  m FileName      This is required because what  Serj Sagan wrote about FileExtension attribute working only with strings

[asp.net-mvc] Html helper for <input type="file" />

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