File.Exists-错误? [英] File.Exists - Wrong?

问题描述

我正在尝试查看图片是否存在，但这说明那里不存在，并且路径正确！ 路径是正确的，并且有图片，但是始终转到"else".

i'm trying to see if the picture exists but this says that isnt there, and the path is correct! The path is correct, and it has a picture, but this allways go to "else".

string path = @"c:\folder\pic.jpg";

if (File.Exists(path))
{ 
    //Do something here 
}
else 
{
}

推荐答案

可能是权限问题.从文档:

如果调用者没有足够的权限来读取指定的文件，则不会抛出异常，并且无论路径是否存在，该方法都将返回false.

If the caller does not have sufficient permissions to read the specified file, no exception is thrown and the method returns false regardless of the existence of path.

当然，这意味着与客户端应用程序相比，在运行Web应用程序(通常在权限降低的情况下运行)时，您更有可能看到此问题.

Of course, this means you're more likely to see this issue when you're running a web app (which typically runs under reduced permissions) than a client app.

此外，如deerchao的注释中所述，File.Exists仅在给定的路径是文件而不是目录的情况下才返回true.再次，从文档中:

Additionally, as noted in deerchao's comment, File.Exists only returns true if the path given is to a file, not a directory. Again, from the documentation:

如果路径描述目录，则此方法返回false.

If path describes a directory, this method returns false.

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