What is the difference between CloudBlob's SetMetadata and BeginSetMetadata ?

Question

What is the difference between CloudBlob's SetMetadata and BeginSetMetadata ?

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http://www.ransen.com Cad and Graphics software

Answer 1

SetMetadata is a synchronous call whereas BeginSetMetadata is an asynchronous one.

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Answer 2

Hi Owen, BeginSetMetadata  is an asynchronous operation, SetMetadata is synchronous. Both do the same operation.

Answer 3

Thanks for the replies both of you.

Does that mean that when SetMetadata returns the blobs data has already been updated and saved?

And BeginSetMetadata is used maybe when you think the operation will take some time?

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http://www.ransen.com Cad and Graphics software

Answer 4

Yes, when SetMetadata returns, the work is done. You can use BeginSetMetadata to do the operation in background. If this operation take a lot, it's a great idea to user BeginSetMetada to do the operation in background.

Answer 5

Does that mean that when SetMetadata returns the blobs data has already been updated and saved?

Yes

And BeginSetMetadata is used maybe when you think the operation will take some time?

Yes, but I would rather say it's quite driven by your application design and requirement. Anyway, to understand the completion status of BeginSetMetadata async call you may make use of while IsCompleted property of IAsyncResult returned by it. E.g.

while (!aResult.IsCompleted)
{
// Perform other operations
}

Alternately, you can make use of callback delegate which is passed as 2nd argument to BeginSetMetadata method. It will receive notification when the asynchronous operation completes.

HTH

Sameer

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Answer 6

Many thanks, you've given me food for thought!

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http://www.ransen.com Cad and Graphics software

Answer 7

Thanks for the help.  :)

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http://www.ransen.com Cad and Graphics software