Accord.IO.CsvReader.IDataReader C# (CSharp) Method

        DataTable IDataReader.GetSchemaTable()
        {
            EnsureInitialize();
            ValidateDataReader(DataReaderValidations.IsNotClosed);

            DataTable schema = new DataTable("SchemaTable");
            schema.Locale = CultureInfo.InvariantCulture;
            schema.MinimumCapacity = _fieldCount;

            schema.Columns.Add(SchemaTableColumn.AllowDBNull, typeof(bool)).ReadOnly = true;
            schema.Columns.Add(SchemaTableColumn.BaseColumnName, typeof(string)).ReadOnly = true;
            schema.Columns.Add(SchemaTableColumn.BaseSchemaName, typeof(string)).ReadOnly = true;
            schema.Columns.Add(SchemaTableColumn.BaseTableName, typeof(string)).ReadOnly = true;
            schema.Columns.Add(SchemaTableColumn.ColumnName, typeof(string)).ReadOnly = true;
            schema.Columns.Add(SchemaTableColumn.ColumnOrdinal, typeof(int)).ReadOnly = true;
            schema.Columns.Add(SchemaTableColumn.ColumnSize, typeof(int)).ReadOnly = true;
            schema.Columns.Add(SchemaTableColumn.DataType, typeof(object)).ReadOnly = true;
            schema.Columns.Add(SchemaTableColumn.IsAliased, typeof(bool)).ReadOnly = true;
            schema.Columns.Add(SchemaTableColumn.IsExpression, typeof(bool)).ReadOnly = true;
            schema.Columns.Add(SchemaTableColumn.IsKey, typeof(bool)).ReadOnly = true;
            schema.Columns.Add(SchemaTableColumn.IsLong, typeof(bool)).ReadOnly = true;
            schema.Columns.Add(SchemaTableColumn.IsUnique, typeof(bool)).ReadOnly = true;
            schema.Columns.Add(SchemaTableColumn.NumericPrecision, typeof(short)).ReadOnly = true;
            schema.Columns.Add(SchemaTableColumn.NumericScale, typeof(short)).ReadOnly = true;
            schema.Columns.Add(SchemaTableColumn.ProviderType, typeof(int)).ReadOnly = true;

            schema.Columns.Add(SchemaTableOptionalColumn.BaseCatalogName, typeof(string)).ReadOnly = true;
            schema.Columns.Add(SchemaTableOptionalColumn.BaseServerName, typeof(string)).ReadOnly = true;
            schema.Columns.Add(SchemaTableOptionalColumn.IsAutoIncrement, typeof(bool)).ReadOnly = true;
            schema.Columns.Add(SchemaTableOptionalColumn.IsHidden, typeof(bool)).ReadOnly = true;
            schema.Columns.Add(SchemaTableOptionalColumn.IsReadOnly, typeof(bool)).ReadOnly = true;
            schema.Columns.Add(SchemaTableOptionalColumn.IsRowVersion, typeof(bool)).ReadOnly = true;

            string[] columnNames;

            if (HasHeaders)
            {
                columnNames = _fieldHeaders;
            }
            else
            {
                columnNames = new string[_fieldCount];

                for (int i = 0; i < _fieldCount; i++)
                    columnNames[i] = "Column" + i.ToString(CultureInfo.InvariantCulture);
            }

            // null marks columns that will change for each row
            object[] schemaRow = 
            { 
                true,                   // 00- AllowDBNull
                null,                   // 01- BaseColumnName
                string.Empty,           // 02- BaseSchemaName
                string.Empty,           // 03- BaseTableName
                null,                   // 04- ColumnName
                null,                   // 05- ColumnOrdinal
                int.MaxValue,           // 06- ColumnSize
                typeof(string),         // 07- DataType
                false,                  // 08- IsAliased
                false,                  // 09- IsExpression
                false,                  // 10- IsKey
                false,                  // 11- IsLong
                false,                  // 12- IsUnique
                DBNull.Value,           // 13- NumericPrecision
                DBNull.Value,           // 14- NumericScale
                (int) DbType.String,    // 15- ProviderType

                string.Empty,           // 16- BaseCatalogName
                string.Empty,           // 17- BaseServerName
                false,                  // 18- IsAutoIncrement
                false,                  // 19- IsHidden
                true,                   // 20- IsReadOnly
                false                   // 21- IsRowVersion
              };

            for (int i = 0; i < columnNames.Length; i++)
            {
                schemaRow[1] = columnNames[i]; // Base column name
                schemaRow[4] = columnNames[i]; // Column name
                schemaRow[5] = i; // Column ordinal

                schema.Rows.Add(schemaRow);
            }

            return schema;
        }