SqlDataReader.GetFieldValue<T>(Int32) Method


Synchronously gets the value of the specified column as a type. GetFieldValueAsync<T>(Int32, CancellationToken) is the asynchronous version of this method.

generic <typename T>
 override T GetFieldValue(int i);
public override T GetFieldValue<T> (int i);
override this.GetFieldValue : int -> 'T
Public Overrides Function GetFieldValue(Of T) (i As Integer) As T

Type Parameters


The type of the value to be returned.



The column to be retrieved.



The returned type object.


The connection drops or is closed during the data retrieval.

The SqlDataReader is closed during the data retrieval.

There is no data ready to be read (for example, the first Read() hasn't been called, or returned false).

Tried to read a previously-read column in sequential mode.

There was an asynchronous operation in progress. This applies to all Get* methods when running in sequential mode, as they could be called while reading a stream.

Trying to read a column that does not exist.

The value of the column was null (IsDBNull(Int32) == true), retrieving a non-SQL type.

T doesn't match the type returned by SQL Server or cannot be cast.


T can be one of the following types:

Boolean Byte Char DateTime
DateTimeOffset Decimal Double Float
Guid Int16 Int32 Int64
SqlBoolean SqlByte SqlDateTime SqlDecimal
SqlDouble SqlGuid SqlInt16 SqlInt32
SqlInt64 SqlMoney SqlSingle SqlString
String UDT, which can be any CLR type marked with SqlUserDefinedTypeAttribute.

For more information, see SqlClient Streaming Support.

Applies to