IEnumerable to Stream for FileStreamResult

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梦毁少年i
梦毁少年i 2021-01-14 08:38

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

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  • 2021-01-14 09:00

    I think you can use it in this first convert your string to byte array and use memory stram afterwards

    string sourceFile = System.Web.HttpContext.Current.Server.MapPath(Path.Combine("/", "yourAddress"));
    byte[] byteArray = System.IO.File.ReadAllBytes(sourceFile);
    
    MemoryStream mem;
            using (mem = new MemoryStream())
            {
                mem.Write(byteArray, 0, (int)byteArray.Length);
                return mem;
            }
    
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  • 2021-01-14 09:13

    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<string> Enumerable
        {
            get;
            private set;
        }
    
        public Encoding ContentEncoding
        {
            get;
            set;
        }
    
        public EnumerableStreamResult(IEnumerable<string> 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);
                }
            }
        }
    }
    
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