在C＃中创建Direcotry [英] Direcotry Creation in C#

问题描述

您好，

我正在尝试使用此代码段在c＃中创建目录

Hello,
I'm trying to create directory in c# using this code snippet

public JsonResult Upload()
        {
           
                try
                {
                    DirectoryInfo di =
                        Directory.CreateDirectory("~/Images_LL/Timeline/" + "userid" + Convert.ToInt32(Session["userid"]) + "");
                }
                catch (ArgumentNullException ex)
                {
                    //throw ex;
                }
                catch (Exception ex)
                {
                    throw ex;
                }

          }

此行不会引发异常，但也不会创建目录。我正在以管理员身份运行visual studio。

请帮我弄清楚我已经在catch块中逐个尝试了所有异常。

抛出异常而不是生成目录。

this line throws no exception but directory is also not created. I'm running visual studio as administrator.
Please help me figure out I have tried all exceptions one by one in catch block.
Neither throws exception not makes directory.

推荐答案

你正在传递一个app相对路径。 目录类对ASP.NET路径一无所知。您需要首先将应用程序相对路径映射到物理路径：

You're passing in an app-relative path. The Directory class doesn't know anything about ASP.NET paths. You need to map the app-relative path to a physical path first:

string virtualPath = string.Format("~/Images_LL/Timeline/userid{0}", Convert.ToInt32(Session["userid"]);
string physicalPath = Server.MapPath(virtualPath);
DirectoryInfo di = Directory.CreateDirectory(physicalPath);

另外，不要使用 throw ex; 来重新抛出异常。如果这样做，你将破坏堆栈跟踪。使用 throw; 代替。



并且不要捕获你不会处理的异常。立即捕获异常重新抛出它没有任何好处。只需删除整个 catch（Exception ex）{...} block。

Also, don't use throw ex; to re-throw an exception. If you do, you'll destroy the stack-trace. Use throw; instead.

And don't catch exceptions that you're not going to handle. Catching an exception and immediately re-throwing it has no benefit. Just remove the entire catch (Exception ex) { ... } block.

使用MapPath得到物理l网站空间中路径的位置。



https://msdn.microsoft.com/en-us/library/system.web.httpserverutility.mappath（v = vs.110）的.aspx [ ^ ]

Use MapPath to get the physical location of the path in your webspace.

https://msdn.microsoft.com/en-us/library/system.web.httpserverutility.mappath(v=vs.110).aspx[^]

Directory.CreateDirectory(Server.MapPath("~/Images_LL/Timeline/") + "userid" ... 

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