使用Path.Combine（）时，源和目标必须不同

运行代码System.IO.IOException: 'Source and destination path must be different.'时，当我尝试将文件从一个移到另一个时，将引发错误。不知何故source，destination成为等效。

const string LIVEDIR = "\\Live";
const string WAITDIR = "\\Wait";
List files = new List(Directory.EnumerateFiles(WORKINGDIR + WAITDIR, "*.jpeg", SearchOption.TopDirectoryOnly));
files.AddRange(Directory.EnumerateFiles(WORKINGDIR + WAITDIR, "*.png", SearchOption.TopDirectoryOnly));
files.AddRange(Directory.EnumerateFiles(WORKINGDIR + WAITDIR, "*.jpg", SearchOption.TopDirectoryOnly));
// ^ adds files that need to be looked through
string[] tags;
ShellFile shellFile;
foreach(string file in files)
{
    string source = Path.Combine(WORKINGDIR, WAITDIR, file);
    string destination = Path.Combine(WORKINGDIR, LIVEDIR, file);
    /*if (source == destination)
        throw new Exception();
    */ // This is also thrown
    shellFile = ShellFile.FromFilePath(Path.Combine(WORKINGDIR, WAITDIR, file));
    tags = shellFile.Properties.System.Photo.TagViewAggregate.Value;
    int i = 0;
    crewMember.Gender foo = crewMember.Gender.Female;
    if (tags == null)
        continue;
    foreach(string tag in tags)
    {
        if(tag == "Ready")
        {
            i++;
        }
        if(tag == "Female")
        {
            i++;
            foo = crewMember.Gender.Female;
        }
        else if(tag == "Male")
        {
            i++;
            foo = crewMember.Gender.Male;
        }
    }

    if(i>=2) // if it has two correct tags
    {
        Console.WriteLine(
            $"source:      {source}\n" +
            $"Destination: {destination}");
        // ^ also writes the same paths to console.
        Directory.Move(source, destination);
        // ^ Error
        crewMembers.Add(new crewMember(file, foo));
    }
}

Path.Combine("C:\\", "workdir", "C:\\outdir\\test.txt")

C:\outdir\test.txt