Asp.Net MVC - 无法开始监视文件更改 - Asp.Net MVC - Failed to start monitoring file changes 小贝子编程网

我尝试使用 ASP.NET MVC编写自己的CMS，并将html视图存储在数据库中。我通过互联网上的教程创建自定义虚拟路径提供程序。

MyVirtualPathProvider Code：

using System.Linq;
using System.Text;
using System.Web.Hosting;
using SgCms.Dal.Concrete;
using SgCms.DomainModels;
namespace SgCms.ViewFactory
{
public class SgCmsVirtualPathProvider : VirtualPathProvider
{
public override bool FileExists(string virtualPath)
{
var view = GetViewFromDatabase(virtualPath);
if (view == null)
{
return base.FileExists(virtualPath);
}
else
{
return true;
}
}
public override VirtualFile GetFile(string virtualPath)
{
var view = GetViewFromDatabase(virtualPath);
if (view == null)
{
return base.GetFile(virtualPath);
}
else
{
byte[] content = ASCIIEncoding.ASCII.
GetBytes(view.InnerHtml);
return new SgCmsVirtualFile
(virtualPath, content);
}
}
private View GetViewFromDatabase(string virtualPath)
{
return PageBuilder(virtualPath);
}
private View PageBuilder(string path)
{
var virtualPath = path.Replace("~", "");
DataContext db = new DataContext();
var view = from v in db.Views
where v.Path == virtualPath
select v;
var res = view.SingleOrDefault();
return res;
}
}
}

我的虚拟文件代码：

using System.IO;
using System.Web.Hosting;
namespace SgCms.ViewFactory
{
public class SgCmsVirtualFile : VirtualFile
{
private byte[] viewContent;
public SgCmsVirtualFile(string virtualPath,
byte[] viewContent) : base(virtualPath)
{
this.viewContent = viewContent;
}
public override Stream Open()
{
return new MemoryStream(viewContent);
}
}
}

我想按路径从数据库获取视图，如下所示：http://localhost/Module_Name/View_Name

我编写了自定义路由，现在所有请求都由一个操作处理。甚至，当GetViewFromDatabase被调用时，它得到了我想要的视图。但是，不幸的是，我有下一个例外：

目录 'c：\usersikita litvinenko\documents\visual studio 2017\Projects\SgCms\SgCms.Web\Views\Main' 不存在。无法开始监视文件更改。说明：执行当前 Web 请求期间发生未经处理的异常。请查看堆栈跟踪，了解有关错误及其在代码中起源位置的详细信息。
异常详细信息：System.Web.HttpException：目录 'c：\usersikita litvinenko\documents\visual studio 2017\Projects\SgCms\SgCms.Web\Views\Main' 不存在。无法开始监视文件更改。
源错误：

在执行当前 Web 请求期间生成了未经处理的异常。可以使用下面的异常堆栈跟踪来识别有关异常来源和位置的信息堆栈跟踪： [HttpException (0x80070002)： Directory 'c：\usersikita litvinenko\documents\visual studio 2017\Projects\SgCms\SgCms.Web\Views\Main' 不存在。无法开始监视文件更改。] System.Web.FileChangesMonitor.FindDirectoryMonitor(String dir， Boolean addIfNotFound， Boolean throwOnError) +589 System.Web.FileChangesMonitor.StartMonitoringPath(String alias， FileChangeEventHandler callback， FileAttributesData& fad) +655 System.Web.Caching.CacheDependency.Init(Boolean isPublic， String[] filenamesArg， String[] cachekeysArg， CacheDependency dependency， DateTime utcStart) +2582 System.Web.Hosting.MapPathBasedVirtualPathProvider.GetCacheDependency(String virtualPath， IEnumerable virtualPathDependencies， DateTime utcStart) +400 System.Web.Hosting.VirtualPathProvider.GetCacheDependency(String virtualPath， IEnumerable virtualPathDependencies， DateTime utcStart) +36 System.Web.Hosting.VirtualPathProvider.GetCacheDependency(VirtualPath virtualPath， IEnumerable virtualPathDependencies， DateTime utcStart) +38 System.Web.Compilation.MemoryBuildResultCache.CacheBuildResult(String cacheKey， BuildResult result， Int64 hashCode， DateTime utcStart) +68 System.Web.Compilation.BuildManager.CacheBuildResultInternal(String cacheKey， BuildResult result， Int64 hashCode， DateTime utcStart) +70 System.Web.Compilation.BuildManager.CompileWebFile(VirtualPath virtualPath) +10180802 System.Web.Compilation.BuildManager.GetVPathBuildResultInternal(VirtualPath virtualPath， Boolean noBuild， Boolean allowCrossApp， Boolean allowBuildInPrecompile， Boolean throwIfNotFound， Boolean ensureIsUpToDate) +294 System.Web.Compilation.BuildManager.GetVPathBuildResultWithNoAssert(HttpContext context， VirtualPath virtualPath， Boolean noBuild， Boolean allowCrossApp， Boolean allowBuildInPrecompile， Boolean throwIfNotFound， Boolean ensureIsUpToDate) +103 System.Web.Compilation.BuildManager.GetVirtualPathObjectFactory(VirtualPath virtualPath， HttpContext context， Boolean allowCrossApp， Boolean throwIfNotFound) +165 System.Web.Compilation.BuildManager.GetCompiledType(VirtualPath virtualPath) +15 System.Web.Compilation.BuildManager.GetCompiledType(String virtualPath) +29 System.Web.Mvc.BuildManagerWrapper.System.Web.Mvc.IBuildManager.GetCompiledType(String virtualPath) +6 System.Web.Mvc.BuildManagerCompiledView.Render(ViewContext viewContext， TextWriter writer) +54 System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context) +291 System.Web.Mvc.ControllerActionInvoker.InvokeActionResult(ControllerContext controllerContext， ActionResult actionResult) +13 System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +56 System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList1 个过滤器， Int32 filterIndex， ResultExecutingContext preContext， ControllerContext controllerContext， ActionResult actionResult) +420 System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext， IList1 filters, ActionResult actionResult) +52 System.Web.Mvc.Async.<>c__DisplayClass2b.<BeginInvokeAction>b__1c() +173 System.Web.Mvc.Async.<>c__DisplayClass21.<BeginInvokeAction>b__1e(IAsyncResult asyncResult) +100 System.Web.Mvc.Async.WrappedAsyncResult1.CallEndDelegate(IAsyncResult asyncResult) +10 System.Web.Mvc.Async.WrappedAsyncResultBase1.End() +49 System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +27 System.Web.Mvc.Controller.<BeginExecuteCore>b__1d(IAsyncResult asyncResult, ExecuteCoreState innerState) +13 System.Web.Mvc.Async.WrappedAsyncVoid1.CallEndDelegate(IAsyncResult asyncResult) +29 System.Web.Mvc.Async.WrappedAsyncResultBase1.End() +49 System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +36 System.Web.Mvc.Controller.<BeginExecute>b__15(IAsyncResult asyncResult, Controller controller) +12 System.Web.Mvc.Async.WrappedAsyncVoid1.CallEndDelegate(IAsyncResult asyncResult) +22 System.Web.Mvc.Async.WrappedAsyncResultBase1.End() +49 System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +26 System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult asyncResult) +10 System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__5(IAsyncResult asyncResult, ProcessRequestState innerState) +21 System.Web.Mvc.Async.WrappedAsyncVoid1.CallEndDelegate(IAsyncResult asyncResult) +29 System.Web.Mvc.Async.WrappedAsyncResultBase'1.End() +49 System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +28 System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +9System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +9765901 System.Web.HttpApplication.ExecuteStep(IExecutionStep step， Boolean& completeSyncally) +155

这很容易。正如Ondrej Svejdar所说，我应该在我的SgCmsVirtualPathProvider中覆盖GetCacheDependency 方法。

public override CacheDependency GetCacheDependency(
string virtualPath, IEnumerable virtualPathDependencies, DateTime utcStart)
{
var view = GetViewFromDatabase(virtualPath);
if (view != null)
{
return null;
}
return Previous.GetCacheDependency(virtualPath,
virtualPathDependencies, utcStart);
}

为什么不以流形式返回响应，而不是处理文件？

哇

Asp.Net MVC - 无法开始监视文件更改

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