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CloudBlockBlob.OpenRead Method

Updated: May 15, 2014

Opens a stream for reading from the blob.

Namespace: Microsoft.WindowsAzure.Storage.Blob
Assembly: Microsoft.WindowsAzure.Storage (in Microsoft.WindowsAzure.Storage.dll)

public Stream OpenRead (
	[OptionalAttribute] AccessCondition accessCondition,
	[OptionalAttribute] BlobRequestOptions options,
	[OptionalAttribute] OperationContext operationContext



An AccessCondition object that represents the condition that must be met in order for the request to proceed. If null, no condition is used.


A BlobRequestOptions object that specifies additional options for the request. If null, default options are applied to the request.


An OperationContext object that represents the context for the current operation.

Return Value

A Stream object to be used for reading from the blob.

Note that this method always makes a call to the FetchAttributes method under the covers.

Set the StreamMinimumReadSizeInBytes property before calling this method to specify the minimum number of bytes to buffer when reading from the stream. The value must be at least 16 KB.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Development Platforms

Windows Vista, Windows 7, Windows Server 2008, Windows 8.1, Windows Server 2012 R2, Windows 8 and Windows Server 2012


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