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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

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.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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