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SqlDataReader.FieldCount Property

Gets the number of columns in the current row.

Namespace:  System.Data.SqlClient
Assembly:  System.Data (in System.Data.dll)

public override int FieldCount { get; }

Property Value

Type: System.Int32
When not positioned in a valid recordset, 0; otherwise the number of columns in the current row. The default is -1.

Implements

IDataRecord.FieldCount
IDataRecord.FieldCount

ExceptionCondition
NotSupportedException

There is no current connection to an instance of SQL Server.

Executing a query that, by its nature, does not return rows (such as a DELETE query), sets FieldCount to 0. However. this should not be confused with a query that returns 0 rows (such as SELECT * FROM table WHERE 1 = 2) in which case FieldCount returns the number of columns in the table, including hidden fields. Use VisibleFieldCount to exclude hidden fields.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

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