将相对路径转为绝对路径:
System.IO.Path.GetFullPath("../../../Lib");
将绝对路径转为相对路径:
/// <summary>
/// 获取一个绝对路径与程序文件的相对路径
/// </summary>
/// <param name="path">绝对路径字符串</param>
/// <returns></returns>
string GetRelativePath(string path)
{
Uri uri = new Uri(path);
Uri exeUri = new Uri(AppDomain.CurrentDomain.BaseDirectory);
Uri relativePath = exeUri.MakeRelativeUri(uri);
return relativePath.ToString();
}