我已经将我的应用程序从MVC 1更新到了MVC 2。然后，一些页面会抛出PathTooLongException异常：
[PathTooLongException: The specified path, file name, or both are too long. The fully qualified file name must be less than 260 characters, and the directory name must be less than 248 characters.]
System.IO.Path.SafeSetStackPointerValue(Char* buffer, Int32 index, Char value) +7493057
System.IO.Path.NormalizePathFast(String path, Boolean fullCheck) +387
System.IO.Path.NormalizePath(String path, Boolean fullCheck) +36
System.IO.Path.GetFullPathInternal(String path) +21
System.Security.Util.StringExpressionSet.CanonicalizePath(String path, Boolean needFullPath) +73
System.Security.Util.StringExpressionSet.CreateListFromExpressions(String[] str, Boolean needFullPath) +278
System.Security.Permissions.FileIOPermission.AddPathList(FileIOPermissionAccess access, AccessControlActions control, String[] pathListOrig, Boolean checkForDuplicates, Boolean needFullPath, Boolean copyPathList) +87
System.Security.Permissions.FileIOPermission..ctor(FileIOPermissionAccess access, String path) +65
System.Web.InternalSecurityPermissions.PathDiscovery(String path) +29
System.Web.HttpRequest.MapPath(VirtualPath virtualPath, VirtualPath baseVirtualDir, Boolean allowCrossAppMapping) +146
System.Web.HttpRequest.MapPath(VirtualPath virtualPath) +37
System.Web.HttpServerUtility.Execute(IHttpHandler handler, TextWriter writer, Boolean preserveForm, Boolean setPreviousPage) +43
System.Web.HttpServerUtility.Execute(IHttpHandler handler, TextWriter writer, Boolean preserveForm) +28
System.Web.HttpServerUtilityWrapper.Execute(IHttpHandler handler, TextWriter writer, Boolean preserveForm) +22
System.Web.Mvc.ViewPage.RenderView(ViewContext viewContext) +284
System.Web.Mvc.WebFormView.RenderViewPage(ViewContext context, ViewPage page) +82
System.Web.Mvc.WebFormView.Render(ViewContext viewContext, TextWriter writer) +85
System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context) +267
System.Web.Mvc.ControllerActionInvoker.InvokeActionResult(ControllerContext controllerContext, ActionResult actionResult) +10
System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +320
System.Web.Mvc.Controller.ExecuteCore() +104
System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +36
System.Web.Mvc.ControllerBase.System.Web.Mvc.IController.Execute(RequestContext requestContext) +7
System.Web.Mvc.<>c__DisplayClass8.<BeginProcessRequest>b__4() +34
System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +21
System.Web.Mvc.Async.<>c__DisplayClass8`1.<BeginSynchronous>b__7(IAsyncResult _) +12
System.Web.Mvc.Async.WrappedAsyncResult`1.End() +53
System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +30
System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +7
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +8678910
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155
我知道ASP.NET中260字符URL长度的问题，但在更新到ASP.NET MVC 2.0之前，我的应用程序运行良好！
这个问题不仅出现在本地，而且在远程托管上也会出现
我比较了RenderView方法的实现。
MVC 1：
public virtual void RenderView(ViewContext viewContext) {
ViewContext = viewContext;
InitHelpers();
// Tracing requires Page IDs to be unique.
ID = Guid.NewGuid().ToString();
ProcessRequest(HttpContext.Current);
}
MVC 2:
public virtual void RenderView(ViewContext viewContext) {
ViewContext = viewContext;
InitHelpers();
bool needServerExecute = false;
SwitchWriter switchWriter = viewContext.HttpContext.Response.Output as SwitchWriter;
if (switchWriter == null) {
switchWriter = new SwitchWriter();
needServerExecute = true;
}
using (switchWriter.Scope(viewContext.Writer)) {
if (needServerExecute) {
// It's safe to reset the _nextId within a Server.Execute() since it pushes a new TraceContext onto
// the stack, so there won't be an ID conflict.
int originalNextId = _nextId;
try {
_nextId = 0;
viewContext.HttpContext.Server.Execute(HttpHandlerUtil.WrapForServerExecute(this), switchWriter, true /* preserveForm */);
}
finally {
// Restore the original _nextId in case this isn't actually the outermost view, since resetting
// the _nextId may now cause trace ID conflicts in the outer view.
_nextId = originalNextId;
}
}
else {
ProcessRequest(HttpContext.Current);
}
}
}