c＃使用Server.MapPath（）找不到路径的一部分

Question

为什么使用Server.MapPath()导致以下错误：

找不到路径“ c：\\ wwwroot \\ currentuser \\ example.com \\ wwwroot \\ SomeFolder \\ myFiles \\”的一部分。

这是我的代码：

 public ActionResult Index(int? page, string sort, string filter)
 {
     try
     {
         string path1 = Path.Combine(Server.MapPath("~/SomeFolder/myFiles/"));
         if (!System.IO.File.Exists(path1))
         {
             string createText = "Hello and Welcome" + Environment.NewLine;
             System.IO.File.WriteAllText(path1, createText);
         }

     }
     catch (Exception ex)
     {
        throw new Exception("HomeController/save text to  file: " + ex.Message, ex);
     }
 }

这是stacktrace：

ErrorMessage: HomeController/save text to file: Could not find a part of the path 'c:\wwwroot\currentuser\example.com\wwwroot\SomeFolder\myFiles\'.<br/>
InnerException: Could not find a part of the path 'c:\wwwroot\currentuser\example.com\wwwroot\SomeFolder\myFiles\'.
StackTrace:    at myProject.Controllers.HomeController.Index()
   at lambda_method(Closure , ControllerBase , Object[] )
   at System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters)
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters)
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.<BeginInvokeSynchronousActionMethod>b__39(IAsyncResult asyncResult, ActionInvocation innerInvokeState)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`2.CallEndDelegate(IAsyncResult asyncResult)
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3d()
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>c__DisplayClass46.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3f()
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass33.<BeginInvokeActionMethodWithFilters>b__32(IAsyncResult asyncResult)
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass21.<>c__DisplayClass2b.<BeginInvokeAction>b__1c()
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass21.<BeginInvokeAction>b__1e(IAsyncResult asyncResult)
   at System.Web.Mvc.Controller.<BeginExecuteCore>b__1d(IAsyncResult asyncResult, ExecuteCoreState innerState)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult)
   at System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult)
   at System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__5(IAsyncResult asyncResult, ProcessRequestState innerState)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult)
   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
Date :11/19/2017 9:27:50 AM

----------------------------------

我该如何解决？

Answer 1

您的代码似乎有问题

您在其中有一个Path.Combine ，但是只有一个文件夹路径作为参数-可以使用，但Path.Combine是用于组合路径部分的。 您确定没有路径部分丢失，例如更多文件夹或文件名吗？

接下来，将Server.MapPath移至文件夹，但使用File.Exists检查其是否存在-这将不起作用，将其设置为文件的路径，或者使用Directory.Exists检查

Server.MapPath不在乎不存在的文件夹和文件。 它只是告诉您传递的相对文件的绝对路径是什么。 它不会对此进行任何检查。 如果计划将文件写入此路径，则可以先安全地在其上调用Directory.CreateDirectory ，以确保目录存在，然后再将文件写入其中。 如果该目录已经存在，则此调用为非操作。 例如：

var fullPath= Server.MapPath("/non/existing/folders/");
Directory.CreateDirectory(fullPath);
fullPath=Path.Combine(fullPath,"newfile.txt");
File.WriteAllText(fullPath, content);