OpenCvSharp.FileStorage.this C# (CSharp) Method

        public FileNode this[string nodeName]
        {
            get
            {
                if (disposed)
                    throw new ObjectDisposedException("FileStorage");
                if (nodeName == null)
                    throw new ArgumentNullException(nameof(nodeName));
                IntPtr node = NativeMethods.core_FileStorage_indexer(ptr, nodeName);
                if (node == IntPtr.Zero)
                    return null;
                return new FileNode(node);
            }
        }