c# - 为什么函数输出错误的值？

Question

下面我写的 Function 用于检查 File/Directory 路径是否存在，旁边还有 RecentPath 检索最后一个路径已由 Function 检查。

    private static String IRecentPath;
    public static String RecentPath
    {
        get
        {
            return IRecentPath;
        }
    }

    public static Boolean Exists(String Path, Int32 PathType = 0)
    {
        return Exist(Path, PathType);
    }

    internal static Boolean Exist(String Path, Int32 PathType = 0)
    {
        Boolean Report = false;
        switch (PathType)
        {
            case 0:
                Report = (Directory.Exists(Path) || File.Exists(Path));
                IRecentPath = Path;
                break;
            case 1:
                String MPath = AppDomain.CurrentDomain.BaseDirectory;
                Report = (Directory.Exists(System.IO.Path.Combine(MPath, Path)) || File.Exists(System.IO.Path.Combine(MPath, Path)));
                IRecentPath = System.IO.Path.Combine(MPath, Path);
                break;
            case 2:
                String LPath = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
                Report = (Directory.Exists(System.IO.Path.Combine(LPath, Path)) || File.Exists(System.IO.Path.Combine(LPath, Path)));
                IRecentPath = System.IO.Path.Combine(LPath, Path);
                break;
            default:
                break;
        }
        return Report;
    }

问题是 RecentPath 总是检索调用函数时设置的路径，而不是最终路径。

例子:

假设我需要检查 myDocument 中是否存在 /user 目录，然后获取最近检查过的路径，所以:

Path.Exists("/user", 2);
MessageBox.Show(Path.RecentPath);

输出应该是 C:\Users\Hossam\Documents\user\ 但它只是 /user。

Answer 1

输入字符串开头的斜杠 (/) 显然会干扰 Path.Combine()。试试这个:

Path.Exists("user", 2);
MessageBox.Show(Path.RecentPath);

输出:C:\Users\Hossam\Documents\user