ChangeExtension()

static ? string System.IO.Path.ChangeExtension ( string? path, string? extension )

inlinestatic

Definition at line 85 of file Path.cs.

    {
        if (path == null)
        {
            return null;
        }
        int num = path.Length;
        if (num == 0)
        {
            return string.Empty;
        }
        for (int num2 = path.Length - 1; num2 >= 0; num2--)
        {
            char c = path[num2];
            if (c == '.')
            {
                num = num2;
                break;
            }
            if (PathInternal.IsDirectorySeparator(c))
            {
                break;
            }
        }
        if (extension == null)
        {
            return path.Substring(0, num);
        }
        ReadOnlySpan<char> readOnlySpan = path.AsSpan(0, num);
        if (!extension.StartsWith('.'))
        {
            return string.Concat(readOnlySpan, ".", extension);
        }
        return string.Concat(readOnlySpan, extension);
    }

References System.IO.PathInternal.IsDirectorySeparator().