IEnumerable to Stream for FileStreamResult

Question

I have an IEnumerable, which is \"streamed\" per yield statements from a method. Now I want to convert this enumerable to a Str

Answer 1

You have to create your ActionResult class to achieve lazy evaluation. You have create mix of ContentResult an FileStreamResult classes to achieve behaviour like FileStreamResult with ability to set result encoding. Good starting point is FileResult abstract class:

public class EnumerableStreamResult : FileResult
{

    public IEnumerable Enumerable
    {
        get;
        private set;
    }

    public Encoding ContentEncoding
    {
        get;
        set;
    }

    public EnumerableStreamResult(IEnumerable enumerable, string contentType)
        : base(contentType)
    {
        if (enumerable == null)
        {
            throw new ArgumentNullException("enumerable");
        }
        this.Enumerable = enumerable;
    }

    protected override void WriteFile(HttpResponseBase response)
    {
        Stream outputStream = response.OutputStream;
        if (this.ContentEncoding != null)
        {
            response.ContentEncoding = this.ContentEncoding;
        }
        if (this.Enumerable != null)
        {
            foreach (var item in Enumerable)
            {

                //do your stuff here
                response.Write(item);
            }
        }
    }
}