Question

I have an extension method below, but when I run this, the foreach gives me InvalidCastException and it says *

Unable to cast object of type
‘System.String’ to type
‘System.Web.HttpPostedFile’.

Code :

public static List<Attachment> GetFiles(this HttpFileCollection collection) {
            if (collection.Count > 0) {
                List<Attachment> items = new List<Attachment>();
                foreach (HttpPostedFile _file in collection) {
                    if (_file.ContentLength > 0)
                        items.Add(new Attachment()
                        {
                            ContentType = _file.ContentType,
                            Name = _file.FileName.LastIndexOf('\\') > 0 ? _file.FileName.Substring(_file.FileName.LastIndexOf('\\') + 1) : _file.FileName,
                            Size = _file.ContentLength / 1024,
                            FileContent = new Binary(new BinaryReader(_file.InputStream).ReadBytes((int)_file.InputStream.Length))
                        });

                    else
                        continue;
                }
                return items;
            } else
                return null;
        }

Thanks in advance.

MSDN Says :

Clients encode files and transmit them
in the content body using multipart
MIME format with an HTTP Content-Type
header of multipart/form-data. ASP.NET
extracts the encoded file(s) from the
content body into individual members
of an HttpFileCollection. Methods and
properties of the HttpPostedFile class
provide access to the contents and
properties of each file.

Answer 1

If you look at the code sample on this page, it shows how you should enumerate the collection, you are in fact getting a string when you try to enumerate as you are.

http://msdn.microsoft.com/en-us/library/system.web.httpfilecollection.aspx