c# - %AllUsersProfile%(%PROGRAMDATA%) 给出重复的文件路径

Question

我有一个用 C# 编写的应用程序，我正在寻求将一些信息写入隐藏的 ProgramData，以便从应用程序的前端和后端访问相同的连接字符串。

我使用路径变量访问目录，如下所示:

private bool ProgramDataWriteFile(string contentToWrite)
        {
            try
            {

                string strProgramDataPath = "%PROGRAMDATA%";
                string directoryPath = Environment.ExpandEnvironmentVariables(strProgramDataPath) + "\\MyApp\\";
                string path = Environment.ExpandEnvironmentVariables(strProgramDataPath)+"\\MyApp\\ConnectionInfo.txt";

                if (Directory.Exists(directoryPath))
                {
                    System.IO.StreamWriter file = new System.IO.StreamWriter(path);
                    file.Write(contentToWrite);
                    file.Close();
                }
                else
                {
                    Directory.CreateDirectory(directoryPath);
                    System.IO.StreamWriter file = new System.IO.StreamWriter(path);
                    file.Write(contentToWrite);
                    file.Close();
                }

                return true;
            }
            catch (Exception e)
            {
            }
            return false;
        }

这似乎工作正常。但是，我的问题是，当我使用此路径变量时: %AllUsersProfile%(%PROGRAMDATA%)相反，它扩展为非法(且冗余)文件路径:C:\ProgramData(C:\ProgramData)\但是，我认为后一个路径变量是正确的全名。难道只是我用错了？我需要确保所有用户都可以访问此连接信息，仅使用 %PROGRAMDATA% 就可以吗？我正在使用 Windows 7，以防相关。

Answer 1

来自here :

FOLDERID_ProgramData / System.Environment.SpecialFolder.CommonApplicationData

The user would never want to browse here in Explorer, and settings changed here should affect every user on the machine. The default location is %systemdrive%\ProgramData, which is a hidden folder, on an installation of Windows Vista. You'll want to create your directory and set the ACLs you need at install time.

所以，只需使用%PROGRAMDATA%，或者更好:

Environment.GetFolderPath(Environment.SpecialFolder.CommonApplicationData)