File.Exists使用错误的根路径？

Question

In my c# class I wrote I have a photo property that returns the photo source if the image exists (nothing or default image otherwise). In my code I use:

    public string Photo
    {
        get
        {
            string source = "~/images/recipes/" + id + ".jpg";

            if (File.Exists(source))
                return "~/images/recipes/" + id + ".jpg";
            else
                return "";
        }
    }

If I get the FileInfo() information for this image I see that I tries to find this image in the following directory: C:\\Program Files (x86)\\Common Files\\Microsoft Shared\\DevServer\\10.0\\~\\images\\recipes

Of course the image is not located in that directory and File.Exists is returning me the wrong value. But how can I fix this?

Answer 1

尝试这个：

if(File.Exists(System.Web.HttpContext.Current.Server.MapPath(source)))

Answer 2

您需要将相对路径映射回物理路径：

string source = HttpContext.Current.Server.MapPath("~/images/recipes/" + id + ".jpg");

Answer 3

You'll have to use:

Server.MapPath(source)

As you can not be 100% sure where the code will be running from, ie. it will be different in development and on a production server. Also are you sure ~/ works in windows? Wont that just be interpreted as a directory named ~? Unless thats what you want.