CODEWITHSUNDEEP
c#.netasp.net-mvcasp.net-mvc-3
Cheng Chen
Cheng Chen

Reputation: 43523

How to create an instance of HttpPostedFileBase(or its inherited type)

Currently I have a byte[] that contains all the data of an image file, just want to build an instance of HttpPostedFileBase so that I can use an existing method, instead of creating a new overload one.

public ActionResult Save(HttpPostedFileBase file)

public ActionResult Save(byte[] data)
{
    //Hope I can construct an instance of HttpPostedFileBase here and then
    return Save(file);

    //instead of writing a lot of similar codes
}

Upvotes: 30

Views: 24991

Answers (2)

Muhammad Hasan Khan
Muhammad Hasan Khan

Reputation: 35146

Create a derived class as follows:

class MemoryFile : HttpPostedFileBase
{
Stream stream;
string contentType;
string fileName;

public MemoryFile(Stream stream, string contentType, string fileName)
{
    this.stream = stream;
    this.contentType = contentType;
    this.fileName = fileName;
}

public override int ContentLength
{
    get { return (int)stream.Length; }
}

public override string ContentType
{
    get { return contentType; }
}

public override string FileName
{
    get { return fileName; }
}

public override Stream InputStream
{
    get { return stream; }
}

public override void SaveAs(string filename)
{
    using (var file = File.Open(filename, FileMode.CreateNew))
        stream.CopyTo(file);
}
}

Now you can pass instance of this class where HttpPostedFileBase is expected.

Upvotes: 54

Darin Dimitrov
Darin Dimitrov

Reputation: 1039238

You cannot manually create an instance of HttpPostedFileBase or derived classes (HttpPostedFile). This class is only supposed to be instantiated by the framework. Why don't you get rid of the second controller action that takes a byte array? It's not necessary. The default model binder will work fine with the one taking a HttpPostedFileBase.

Upvotes: 1

Related Questions