Επεξεργασία

Κοινή χρήση μέσω

DataReaderExtensions.GetStream(DbDataReader, String) Method

  • Reference

Definition

Namespace:
System.Data
Assembly:
System.Data.Common.dll
Assembly:
netstandard.dll
Source:
DataReaderExtensions.cs
Source:
DataReaderExtensions.cs
Source:
DataReaderExtensions.cs

Gets a stream to retrieve data from the specified column.

public:
[System::Runtime::CompilerServices::Extension]
 static System::IO::Stream ^ GetStream(System::Data::Common::DbDataReader ^ reader, System::String ^ name);
public static System.IO.Stream GetStream (this System.Data.Common.DbDataReader reader, string name);
static member GetStream : System.Data.Common.DbDataReader * string -> System.IO.Stream
<Extension()>
Public Function GetStream (reader As DbDataReader, name As String) As Stream

Parameters

reader
DbDataReader

The data reader to get the column value from.

name
String

The name of the column.

Returns

Stream

A stream.

Exceptions

InvalidOperationException

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.

IndexOutOfRangeException

The name specified is not a valid column name.

InvalidCastException

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.

Applies to