IDataReader.GetSchemaTable Method

Definition

Namespace:

System.Data

Assembly:

System.Data.Common.dll

Returns a DataTable that describes the column metadata of the IDataReader.

Returns null if the executed command returned no resultset, or after NextResult() returns false.

public:
 System::Data::DataTable ^ GetSchemaTable();

public System.Data.DataTable? GetSchemaTable ();

abstract member GetSchemaTable : unit -> System.Data.DataTable

Public Function GetSchemaTable () As DataTable

Returns

DataTable

A DataTable that describes the column metadata.

Exceptions

InvalidOperationException

The IDataReader is closed.

Remarks

The implementation of GetSchemaTable method for the .NET Framework Data Provider for OLE DB maps to the OLE DB IColumnsRowset::GetColumnsRowset method, while implementations for other .NET Framework data providers do not use an OLE DB provider layer. The order in which GetSchemaTable returns metadata about each column in a table, and the DataReader columns that are returned, vary depending on which data provider you use. The following table lists data providers and members that implement GetSchemaTable.

Data Provider	Member
.NET Data Provider for ODBC	OdbcDataReader.GetSchemaTable.
.NET Data Provider for OLE DB	OleDbDataReader.GetSchemaTable.
.NET Data Provider for Oracle	OracleDataReader.GetSchemaTable.
.NET Data Provider for SQL Server	SqlDataReader.GetSchemaTable.