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Showing content from https://learn.microsoft.com/en-us/dotnet/api/system.data.common.dbdatareader.getstream below:

DbDataReader.GetStream(Int32) Method (System.Data.Common) | Microsoft Learn

DbDataReader.GetStream(Int32) Method Definition

Gets a stream to retrieve data from the specified column.

public:
 virtual System::IO::Stream ^ GetStream(int ordinal);

public virtual System.IO.Stream GetStream(int ordinal);

abstract member GetStream : int -> System.IO.Stream
override this.GetStream : int -> System.IO.Stream

Public Overridable Function GetStream (ordinal As Integer) As Stream

Parameters

ordinal: Int32

The zero-based column ordinal.

Returns

A stream.

Exceptions

The connection was dropped or closed during the data retrieval.

-or-

The data reader is closed during the data retrieval.

-or-

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

-or-

The data reader tried to read a previously-read column in sequential mode.

-or-

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.

The column index is out of range.

The specified column isn't a binary type that supports reading with a Stream.

Remarks

GetStream only supports the retrieval of values that can be converted to byte arrays.

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