C# 获取 %AppData% 的路径 [英] C# getting the path of %AppData%

问题描述

C# 2008 SP1

C# 2008 SP1

我正在使用以下代码:

dt.ReadXml("%AppData%\DateLinks.xml");

但是，我收到一个异常，指向我的应用程序运行的位置:

However, I am getting an exception that points to the location of where my application is running from:

找不到路径的一部分'D:ProjectsSubVersionProjectsCatDialerinDebug\%AppData%DateLinks.xml'.

Could not find a part of the path 'D:ProjectsSubVersionProjectsCatDialerinDebug\%AppData%DateLinks.xml'.

我认为 %AppData% 应该找到相对路径.当我去 Start|Run|%AppData% 时，windows 资源管理器会将我带到该目录.

I thought the %AppData% should find the relative path. When I go Start|Run|%AppData% windows explorer takes me to that directory.

我无法输入完整路径，因为每个客户端计算机上的用户都不同.

I can not put the full path in, as the user is different on each client machine.

推荐答案

要获取AppData目录，最好使用GetFolderPath方法:

To get the AppData directory, it's best to use the GetFolderPath method:

Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData)

(如果不存在，必须添加using System).

(must add using System if not present).

%AppData% 是一个环境变量，它们不会在 .NET 中的任何地方自动扩展，尽管您可以明确使用 Environment.ExpandEnvironmentVariable 方法来做到这一点.但是，我仍然强烈建议您使用 GetFolderPath，因为正如 Johannes Rössel 在评论中指出的那样，在某些情况下可能不会设置 %AppData%.

%AppData% is an environment variable, and they are not automatically expanded anywhere in .NET, although you can explicitly use the Environment.ExpandEnvironmentVariable method to do so. I would still strongly suggest that you use GetFolderPath however, because as Johannes Rössel points out in the comment, %AppData% may not be set in certain circumstances.

最后，创建示例中所示的路径:

Finally, to create the path as shown in your example:

var fileName = Path.Combine(Environment.GetFolderPath(
    Environment.SpecialFolder.ApplicationData), "DateLinks.xml");

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