public IList <ProtoDataColumn> GetColumns(
IDataReader reader,
ProtoDataWriterOptions options)
{
if (reader == null)
{
throw new ArgumentNullException("reader");
}
if (options == null)
{
throw new ArgumentNullException("options");
}
using (DataTable schema = reader.GetSchemaTable())
{
bool schemaSupportsExpressions = schema.Columns.Contains("Expression");
var columns = new List <ProtoDataColumn>(schema.Rows.Count);
for (int i = 0; i < schema.Rows.Count; i++)
{
// Assumption: rows in the schema table are always ordered by
// Ordinal position, ascending
DataRow row = schema.Rows[i];
// Skip computed columns unless requested.
if (schemaSupportsExpressions)
{
bool isComputedColumn;
if (IsRunningOnMono)
{
isComputedColumn = Equals(row["Expression"], string.Empty);
}
else
{
isComputedColumn = !(row["Expression"] is DBNull);
}
if (isComputedColumn && !options.IncludeComputedColumns)
{
continue;
}
}
var col = new ProtoDataColumn
{
ColumnIndex = i,
ProtoDataType = ConvertProtoDataType.FromClrType((Type)row["DataType"]),
ColumnName = (string)row["ColumnName"]
};
columns.Add(col);
}
return(columns);
}
}
public static IList <ProtoDataColumn> GetColumns(IDataReader reader, ProtoDataWriterOptions options)
{
using (var schemaTable = reader.GetSchemaTable())
{
var schemaSupportsExpressions = schemaTable.Columns.Contains("Expression");
var columns = new List <ProtoDataColumn>(schemaTable.Rows.Count);
for (var i = 0; i < schemaTable.Rows.Count; i++)
{
// Assumption: rows in the schema table are always ordered by
// Ordinal position, ascending
var row = schemaTable.Rows[i];
// Skip computed columns unless requested.
if (schemaSupportsExpressions)
{
bool isComputedColumn;
if (IsRunningOnMono)
{
isComputedColumn = Equals(row["Expression"], string.Empty);
}
else
{
isComputedColumn = !(row["Expression"] is DBNull);
}
if (isComputedColumn && !options.IncludeComputedColumns)
{
continue;
}
}
var columnName = (string)row["ColumnName"];
var dataType = (Type)row["DataType"];
var protoBufDataType = ConvertProtoDataType.FromClrType(dataType);
columns.Add(new ProtoDataColumn(columnName, dataType, protoBufDataType));
}
return(columns);
}
}
