65 lines
2.2 KiB
C#
65 lines
2.2 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.Text.Encodings.Web;
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using System.Threading.Tasks;
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using Microsoft.AspNet.Html;
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namespace Microsoft.AspNet.Mvc.Razor
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{
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/// <summary>
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/// Represents a deferred write operation in a <see cref="RazorPage"/>.
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/// </summary>
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public class HelperResult : IHtmlContent
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{
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private readonly Func<TextWriter, Task> _asyncAction;
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/// <summary>
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/// Creates a new instance of <see cref="HelperResult"/>.
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/// </summary>
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/// <param name="asyncAction">The asynchronous delegate to invoke when
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/// <see cref="WriteTo(TextWriter, HtmlEncoder)"/> is called.</param>
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/// <remarks>Calls to <see cref="WriteTo(TextWriter, HtmlEncoder)"/> result in a blocking invocation of
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/// <paramref name="asyncAction"/>.</remarks>
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public HelperResult(Func<TextWriter, Task> asyncAction)
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{
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if (asyncAction == null)
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{
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throw new ArgumentNullException(nameof(asyncAction));
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}
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_asyncAction = asyncAction;
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}
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/// <summary>
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/// Gets the asynchronous delegate to invoke when <see cref="WriteTo(TextWriter, HtmlEncoder)"/> is called.
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/// </summary>
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public Func<TextWriter, Task> WriteAction
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{
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get { return _asyncAction; }
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}
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/// <summary>
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/// Method invoked to produce content from the <see cref="HelperResult"/>.
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/// </summary>
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/// <param name="writer">The <see cref="TextWriter"/> instance to write to.</param>
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/// <param name="encoder">The <see cref="HtmlEncoder"/> to encode the content.</param>
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public virtual void WriteTo(TextWriter writer, HtmlEncoder encoder)
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{
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if (writer == null)
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{
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throw new ArgumentNullException(nameof(writer));
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}
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if (encoder == null)
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{
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throw new ArgumentNullException(nameof(encoder));
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}
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_asyncAction(writer).GetAwaiter().GetResult();
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}
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}
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}
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