/// <summary>
/// Creates a <see cref="RelativePath"/> instance from a relative path
/// string (e.g. "foo\\bar\\blah.txt") and the corresponding file name (e.g.
/// "blah.txt"). <paramref name="relativePath"/> must be end with <paramref
/// name="filename"/>.
/// </summary>
public RelativePath(string relativePath, string filename)
{
if (relativePath == null)
{
throw new ArgumentNullException("relativePath");
}
if (filename == null)
{
throw new ArgumentNullException("filename");
}
if (PathHelpers.IsAbsolutePath(relativePath))
{
throw new ArgumentException("Path must be relative.", "relativePath");
}
if (!PathHelpers.IsFileName(filename))
{
throw new ArgumentException("Path must be a simple file name + extension.", "filename");
}
if (relativePath.Length < filename.Length)
{
throw new ArgumentException("Relative path must contain file name", "relativePath");
}
if (string.Compare(relativePath, relativePath.Length - filename.Length, filename, 0, filename.Length, StringComparison.Ordinal) != 0)
{
throw new ArgumentException("Relative path must end with file name", "relativePath");
}
_relativePath = relativePath;
_filename = filename;
}
private static string ExtractFileName(string relativePath)
{
if (relativePath == null)
{
throw new ArgumentNullException("relativePath");
}
if (PathHelpers.IsFileName(relativePath))
{
return(relativePath);
}
return(PathHelpers.GetFileName(relativePath));
}