如何解决在.NET Core中显示部分视图时出错
我正在尝试使用局部视图在不同页面上显示资产信息,但出现以下错误
“ InvalidOperationException:名为'AssetInfo'的视图组件可以 找不到。视图组件必须是公共非抽象类, 不包含任何通用参数,并且用 “ ViewComponentAttribute”或类名以 “ ViewComponent”后缀。视图组件不得使用 'NonViewComponentAttribute'。”
控制器
public ActionResult AssetInfo(int? Id)
{
var model = _context.Asset.Where(x => x.Id == Id).ToList();
return PartialView("_AssetInfo",model);
}
部分视图
@model IEnumerable<InformationAssetRegister.Models.Asset>
<table border="1" cellpadding="4" cellspacing="4">
<tr>
<th style="background-color: Yellow;color: blue">
Asset Name
</th>
<th style="background-color: Yellow;color: blue">
Asset type
</th>
</tr>
@foreach (var item in Model)
{
<tr>
<td>
@Html.DisplayFor(modelItem => item.AssetName)
</td>
<td>
@Html.DisplayFor(modelItem => item.AssetType)
</td>
</tr>
}
我尝试使用Html.RenderAction,但是Renderaction无法在.Net Core中使用
@{
Html.RenderAction("AssetInfo","Assets",new {Id= ViewBag.AssetId });
}
我也尝试了下面的代码
@await Component.InvokeAsync("AssetInfo",new { Id = ViewBag.AssetId })
任何人都可以帮助解决此问题。我是.Net Core的新手
解决方法
据我所知,Html.RenderAction
已在asp.net核心中删除。 ASP.NET Core使用称为ViewComponents的新功能来实现相同的目的。 Article。有关如何将Renderaction替换为ViewComponents的更多详细信息,可以参考此answer。
如果您仍想在asp.net核心中使用Html.RenderAction。
我建议您可以自己实现它,可以创建一个类并将以下代码添加到您的项目中。
using System;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Html;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc.Infrastructure;
using Microsoft.AspNetCore.Routing;
namespace Microsoft.AspNetCore.Mvc.Rendering
{
public static class HtmlHelperViewExtensions
{
public static IHtmlContent RenderAction(this IHtmlHelper helper,string action,object parameters = null)
{
var controller = (string)helper.ViewContext.RouteData.Values["controller"];
return RenderAction(helper,action,controller,parameters);
}
public static IHtmlContent RenderAction(this IHtmlHelper helper,string controller,object parameters = null)
{
var area = (string)helper.ViewContext.RouteData.Values["area"];
return RenderAction(helper,area,string area,object parameters = null)
{
if (action == null)
throw new ArgumentNullException(nameof(controller));
if (controller == null)
throw new ArgumentNullException(nameof(action));
var task = RenderActionAsync(helper,parameters);
return task.Result;
}
private static async Task<IHtmlContent> RenderActionAsync(this IHtmlHelper helper,object parameters = null)
{
// fetching required services for invocation
var currentHttpContext = helper.ViewContext.HttpContext;
var httpContextFactory = GetServiceOrFail<IHttpContextFactory>(currentHttpContext);
var actionInvokerFactory = GetServiceOrFail<IActionInvokerFactory>(currentHttpContext);
var actionSelector = GetServiceOrFail<IActionDescriptorCollectionProvider>(currentHttpContext);
// creating new action invocation context
var routeData = new RouteData();
var routeParams = new RouteValueDictionary(parameters ?? new { });
var routeValues = new RouteValueDictionary(new { area,action });
var newHttpContext = httpContextFactory.Create(currentHttpContext.Features);
newHttpContext.Response.Body = new MemoryStream();
foreach (var router in helper.ViewContext.RouteData.Routers)
routeData.PushState(router,null,null);
routeData.PushState(null,routeValues,null);
routeData.PushState(null,routeParams,null);
var actionDescriptor = actionSelector.ActionDescriptors.Items.First(i => i.RouteValues["Controller"] == controller && i.RouteValues["Action"] == action);
var actionContext = new ActionContext(newHttpContext,routeData,actionDescriptor);
// invoke action and retrieve the response body
var invoker = actionInvokerFactory.CreateInvoker(actionContext);
string content = null;
await invoker.InvokeAsync().ContinueWith(task =>
{
if (task.IsFaulted)
{
content = task.Exception.Message;
}
else if (task.IsCompleted)
{
newHttpContext.Response.Body.Position = 0;
using (var reader = new StreamReader(newHttpContext.Response.Body))
content = reader.ReadToEnd();
}
});
return new HtmlString(content);
}
private static TService GetServiceOrFail<TService>(HttpContext httpContext)
{
if (httpContext == null)
throw new ArgumentNullException(nameof(httpContext));
var service = httpContext.RequestServices.GetService(typeof(TService));
if (service == null)
throw new InvalidOperationException($"Could not locate service: {nameof(TService)}");
return (TService)service;
}
}
}
查看:
@Html.RenderAction("AssetInfo","Home",new { Id = 2 });
家庭控制器:
public ActionResult AssetInfo(int? Id)
{
//var model = _context.Asset.Where(x => x.Id == Id).ToList();
var model = new List<Asset>() {
new Asset(){ AssetName="te",AssetType="te2" }
};
return PartialView("_AssetInfo",model);
}
结果:
版权声明:本文内容由互联网用户自发贡献,该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容, 请发送邮件至 dio@foxmail.com 举报,一经查实,本站将立刻删除。