89 lines
2.9 KiB
C#
89 lines
2.9 KiB
C#
// Copyright (c) .NET Foundation. All rights reserved.
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// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
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using System;
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using System.IO;
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using System.Threading;
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using System.Threading.Tasks;
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using Microsoft.AspNetCore.Http;
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using Microsoft.AspNetCore.Http.Features;
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using Microsoft.Net.Http.Headers;
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namespace Microsoft.AspNetCore.Mvc
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{
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/// <summary>
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/// Represents an <see cref="ActionResult"/> that when executed will
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/// write a file from a stream to the response.
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/// </summary>
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public class FileStreamResult : FileResult
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{
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// default buffer size as defined in BufferedStream type
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private const int BufferSize = 0x1000;
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private Stream _fileStream;
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/// <summary>
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/// Creates a new <see cref="FileStreamResult"/> instance with
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/// the provided <paramref name="fileStream"/> and the
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/// provided <paramref name="contentType"/>.
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/// </summary>
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/// <param name="fileStream">The stream with the file.</param>
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/// <param name="contentType">The Content-Type header of the response.</param>
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public FileStreamResult(Stream fileStream, string contentType)
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: this(fileStream, MediaTypeHeaderValue.Parse(contentType))
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{
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}
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/// <summary>
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/// Creates a new <see cref="FileStreamResult"/> instance with
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/// the provided <paramref name="fileStream"/> and the
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/// provided <paramref name="contentType"/>.
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/// </summary>
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/// <param name="fileStream">The stream with the file.</param>
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/// <param name="contentType">The Content-Type header of the response.</param>
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public FileStreamResult(Stream fileStream, MediaTypeHeaderValue contentType)
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: base(contentType?.ToString())
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{
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if (fileStream == null)
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{
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throw new ArgumentNullException(nameof(fileStream));
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}
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FileStream = fileStream;
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}
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/// <summary>
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/// Gets or sets the stream with the file that will be sent back as the response.
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/// </summary>
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public Stream FileStream
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{
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get
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{
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return _fileStream;
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}
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set
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{
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if (value == null)
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{
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throw new ArgumentNullException(nameof(value));
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}
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_fileStream = value;
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}
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}
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/// <inheritdoc />
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protected async override Task WriteFileAsync(HttpResponse response)
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{
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var outputStream = response.Body;
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using (FileStream)
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{
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var bufferingFeature = response.HttpContext.Features.Get<IHttpBufferingFeature>();
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bufferingFeature?.DisableResponseBuffering();
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await FileStream.CopyToAsync(outputStream, BufferSize);
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}
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}
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}
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} |