[QUERY] What is the actual type of Azure.Storage.Queues.Models.QueueMessage.MessageId?

[IanKemp]

Query/Question
According to MSDN, the type of QueueMessage.MessageId is string. However in our testing, we have seen that it is actually always a Guid that's been ToString()'ed.

Other MSDN docs, e.g. this one, explicitly state that this value is a GUID even though typed as a string. (I'm aware that linked doc is referring to a very old version, I'm just giving an example of a mismatch).

Can I rely on this value always being a GUID in actuality? The reason I ask is that I have a requirement to serialize specific queue messages into a SQL database (please don't ask why), and obviously if the MessageId is actually a GUID I can just use it directly as the primary key on the table to look up a particular message. Conversely, if it's actually a string, I need a standard integer PK with a separate indexed nvarchar(max) column holding the MessageId.

Finally, if MessageId is a GUID, why is it still typed as string in the SDK POCOs? Simply for backwards-compatibility reasons?

Environment:

• Name and version of the Library package used: Azure.Storage.Queues 12.6.1.0

[ghost]

Thanks for the feedback! We are routing this to the appropriate team for follow-up. cc @xgithubtriage.

Issue Details

---

Query/Question
According to MSDN, the type of QueueMessage.MessageId is string. However in our testing, we have seen that it is actually always a Guid that's been ToString()'ed.

Other MSDN docs, e.g. this one, explicitly state that this value is a GUID even though typed as a string. (I'm aware that linked doc is referring to a very old version, I'm just giving an example of a mismatch).

Can I rely on this value always being a GUID in actuality? The reason I ask is that I have a requirement to serialize specific queue messages into a SQL database (please don't ask why), and obviously if the MessageId is actually a GUID I can just use it directly as the primary key on the table to look up a particular message. Conversely, if it's actually a string, I need a standard integer PK with a separate indexed nvarchar(max) column holding the MessageId.

Finally, if MessageId is a GUID, why is it still typed as string in the SDK POCOs? Simply for backwards-compatibility reasons?

Environment:

• Name and version of the Library package used: Azure.Storage.Queues 12.6.1.0

Author:	IanKemp
Assignees:	-
Labels:	Client, Service Attention, Storage, customer-reported, needs-team-attention, needs-triage, question
Milestone:	-

[kasobol-msft]

@IanKemp The REST API doc states that message id is a GUID. Same doc states that message id is opaque to the client, i.e. client should not attempt to interpret that value, hence string in SDK models (which also means less parsing/serializing).

For your purpose I think it's safe to assume that message id is a GUID.