58 lines
2.3 KiB
C#
58 lines
2.3 KiB
C#
// Copyright (c) Microsoft Open Technologies, Inc. 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.Threading;
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using System.Threading.Tasks;
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using Microsoft.AspNet.Http;
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namespace Microsoft.AspNet.StaticFiles
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{
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/// <summary>
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/// Provides extensions for HttpResponse exposing the SendFile extension.
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/// </summary>
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public static class SendFileResponseExtensions
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{
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/// <summary>
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/// Checks if the SendFile extension is supported.
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/// </summary>
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/// <param name="response"></param>
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/// <returns>True if sendfile.SendAsync is defined in the environment.</returns>
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public static bool SupportsSendFile([NotNull] this HttpResponse response)
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{
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return response.HttpContext.GetFeature<IHttpSendFileFeature>() != null;
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}
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/// <summary>
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/// Sends the given file using the SendFile extension.
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/// </summary>
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/// <param name="response"></param>
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/// <param name="fileName"></param>
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/// <returns></returns>
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public static Task SendFileAsync([NotNull] this HttpResponse response, [NotNull] string fileName)
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{
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return response.SendFileAsync(fileName, 0, null, CancellationToken.None);
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}
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/// <summary>
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/// Sends the given file using the SendFile extension.
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/// </summary>
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/// <param name="response"></param>
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/// <param name="fileName">The full or relative path to the file.</param>
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/// <param name="offset">The offset in the file.</param>
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/// <param name="count">The number of types to send, or null to send the remainder of the file.</param>
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/// <param name="cancellationToken"></param>
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/// <returns></returns>
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public static Task SendFileAsync([NotNull] this HttpResponse response, [NotNull] string fileName, long offset, long? count, CancellationToken cancellationToken)
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{
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var sendFile = response.HttpContext.GetFeature<IHttpSendFileFeature>();
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if (sendFile == null)
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{
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throw new NotSupportedException(Resources.Exception_SendFileNotSupported);
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}
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return sendFile.SendFileAsync(fileName, offset, count, cancellationToken);
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}
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}
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}
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