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ViewComponentResultExecutor.cs
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/
ViewComponentResultExecutor.cs
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// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System;
using System.Text.Encodings.Web;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Html;
using Microsoft.AspNetCore.Mvc.Infrastructure;
using Microsoft.AspNetCore.Mvc.Internal;
using Microsoft.AspNetCore.Mvc.ModelBinding;
using Microsoft.AspNetCore.Mvc.Rendering;
using Microsoft.AspNetCore.Mvc.ViewFeatures.Internal;
using Microsoft.AspNetCore.WebUtilities;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
namespace Microsoft.AspNetCore.Mvc.ViewFeatures
{
public class ViewComponentResultExecutor : IActionResultExecutor<ViewComponentResult>
{
private readonly HtmlEncoder _htmlEncoder;
private readonly HtmlHelperOptions _htmlHelperOptions;
private readonly ILogger<ViewComponentResult> _logger;
private readonly IModelMetadataProvider _modelMetadataProvider;
private readonly ITempDataDictionaryFactory _tempDataDictionaryFactory;
public ViewComponentResultExecutor(
IOptions<MvcViewOptions> mvcHelperOptions,
ILoggerFactory loggerFactory,
HtmlEncoder htmlEncoder,
IModelMetadataProvider modelMetadataProvider,
ITempDataDictionaryFactory tempDataDictionaryFactory)
{
if (mvcHelperOptions == null)
{
throw new ArgumentNullException(nameof(mvcHelperOptions));
}
if (loggerFactory == null)
{
throw new ArgumentNullException(nameof(loggerFactory));
}
if (htmlEncoder == null)
{
throw new ArgumentNullException(nameof(htmlEncoder));
}
if (modelMetadataProvider == null)
{
throw new ArgumentNullException(nameof(modelMetadataProvider));
}
if (tempDataDictionaryFactory == null)
{
throw new ArgumentNullException(nameof(tempDataDictionaryFactory));
}
_htmlHelperOptions = mvcHelperOptions.Value.HtmlHelperOptions;
_logger = loggerFactory.CreateLogger<ViewComponentResult>();
_htmlEncoder = htmlEncoder;
_modelMetadataProvider = modelMetadataProvider;
_tempDataDictionaryFactory = tempDataDictionaryFactory;
}
/// <inheritdoc />
public virtual async Task ExecuteAsync(ActionContext context, ViewComponentResult result)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
if (result == null)
{
throw new ArgumentNullException(nameof(result));
}
var response = context.HttpContext.Response;
var viewData = result.ViewData;
if (viewData == null)
{
viewData = new ViewDataDictionary(_modelMetadataProvider, context.ModelState);
}
var tempData = result.TempData;
if (tempData == null)
{
tempData = _tempDataDictionaryFactory.GetTempData(context.HttpContext);
}
ResponseContentTypeHelper.ResolveContentTypeAndEncoding(
result.ContentType,
response.ContentType,
ViewExecutor.DefaultContentType,
out var resolvedContentType,
out var resolvedContentTypeEncoding);
response.ContentType = resolvedContentType;
if (result.StatusCode != null)
{
response.StatusCode = result.StatusCode.Value;
}
using (var writer = new HttpResponseStreamWriter(response.Body, resolvedContentTypeEncoding))
{
var viewContext = new ViewContext(
context,
NullView.Instance,
viewData,
tempData,
writer,
_htmlHelperOptions);
OnExecuting(viewContext);
// IViewComponentHelper is stateful, we want to make sure to retrieve it every time we need it.
var viewComponentHelper = context.HttpContext.RequestServices.GetRequiredService<IViewComponentHelper>();
(viewComponentHelper as IViewContextAware)?.Contextualize(viewContext);
var viewComponentResult = await GetViewComponentResult(viewComponentHelper, _logger, result);
viewComponentResult.WriteTo(writer, _htmlEncoder);
}
}
private void OnExecuting(ViewContext viewContext)
{
var viewDataValuesProvider = viewContext.HttpContext.Features.Get<IViewDataValuesProviderFeature>();
if (viewDataValuesProvider != null)
{
viewDataValuesProvider.ProvideViewDataValues(viewContext.ViewData);
}
}
private Task<IHtmlContent> GetViewComponentResult(IViewComponentHelper viewComponentHelper, ILogger logger, ViewComponentResult result)
{
if (result.ViewComponentType == null && result.ViewComponentName == null)
{
throw new InvalidOperationException(Resources.FormatViewComponentResult_NameOrTypeMustBeSet(
nameof(ViewComponentResult.ViewComponentName),
nameof(ViewComponentResult.ViewComponentType)));
}
else if (result.ViewComponentType == null)
{
logger.ViewComponentResultExecuting(result.ViewComponentName);
return viewComponentHelper.InvokeAsync(result.ViewComponentName, result.Arguments);
}
else
{
logger.ViewComponentResultExecuting(result.ViewComponentType);
return viewComponentHelper.InvokeAsync(result.ViewComponentType, result.Arguments);
}
}
}
}