Moved FormFileExtensions methods to IFormFile

Author: khellang

src/Microsoft.AspNet.Http.Abstractions/IFormFile.cs

@@ -2,6 +2,8 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
 
 namespace Microsoft.AspNet.Http
 {
@@ -23,5 +25,24 @@ public interface IFormFile
         string FileName { get; }
 
         Stream OpenReadStream();
+
+        /// <summary>
+        /// Saves the contents of the uploaded file.
+        /// </summary>
+        /// <param name="path">The path of the file to create.</param>
+        void SaveAs(string path);
+
+        /// <summary>
+        /// Asynchronously saves the contents of the uploaded file.
+        /// </summary>
+        /// <param name="path">The path of the file to create.</param>
+        Task SaveAsAsync(string path);
+
+        /// <summary>
+        /// Asynchronously saves the contents of the uploaded file.
+        /// </summary>
+        /// <param name="path">The path of the file to create.</param>
+        /// <param name="cancellationToken"></param>
+        Task SaveAsAsync(string path, CancellationToken cancellationToken);
     }
 }

src/Microsoft.AspNet.Http.Extensions/FormFileExtensions.cs

@@ -2,12 +2,17 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
 using Microsoft.AspNet.Http.Internal;
 
 namespace Microsoft.AspNet.Http.Features.Internal
 {
     public class FormFile : IFormFile
     {
+        // Stream.CopyTo method uses 80KB as the default buffer size.
+        private const int DefaultBufferSize = 80 * 1024;
+
         private readonly Stream _baseStream;
         private readonly long _baseStreamOffset;
 
@@ -44,5 +49,41 @@ public Stream OpenReadStream()
         {
             return new ReferenceReadStream(_baseStream, _baseStreamOffset, Length);
         }
+
+        /// <summary>
+        /// Saves the contents of the uploaded file.
+        /// </summary>
+        /// <param name="path">The path of the file to create.</param>
+        public void SaveAs(string path)
+        {
+            using (var fileStream = new FileStream(path, FileMode.Create))
+            {
+                var inputStream = OpenReadStream();
+                inputStream.CopyTo(fileStream);
+            }
+        }
+
+        /// <summary>
+        /// Asynchronously saves the contents of the uploaded file.
+        /// </summary>
+        /// <param name="path">The path of the file to create.</param>
+        public Task SaveAsAsync(string path)
+        {
+            return SaveAsAsync(path, CancellationToken.None);
+        }
+
+        /// <summary>
+        /// Asynchronously saves the contents of the uploaded file.
+        /// </summary>
+        /// <param name="path">The path of the file to create.</param>
+        /// <param name="cancellationToken"></param>
+        public async Task SaveAsAsync(string path, CancellationToken cancellationToken)
+        {
+            using (var fileStream = new FileStream(path, FileMode.Create))
+            {
+                var inputStream = OpenReadStream();
+                await inputStream.CopyToAsync(fileStream, DefaultBufferSize, cancellationToken);
+            }
+        }
     }
 }