How to Retrieve all email send definitions by folder (category) ID through the Marketing Cloud API

Question

I'm using the SalesForce Marketing Cloud (Exact Target).

I have a folder ID (category ID) and I want to get all the send definitions (user-initiated sends) in that folder via the SOAP API in C#. I know when retrieving lists, I can create a filter that matches on Category (folder ID).

When I attempt to do the same for email send definitions, I receive the status :

Error: The Filter Property 'CategoryID' is not a retrievable property.

I tried both Category and CategoryID, and no luck. Anyone have success trying to do this?

Here is my code to set up the filter:

        RetrieveRequest rr = new RetrieveRequest();
        rr.ObjectType = "EmailSendDefinition";
        rr.Properties = new string[] { "ObjectID", "Name", "CategoryID", "SenderProfile.FromName", "SenderProfile.CustomerKey" };

        SimpleFilterPart sfp = new SimpleFilterPart();
        sfp.Property = "CategoryID";
        sfp.SimpleOperator = SimpleOperators.equals;
        sfp.Value = new string[] { categoryId };
        rr.Filter = sfp;

Answer 1

I tried with CategoryID in SimpleFilter it works, do you have EmailSendDefinition as ObjectTye in your request? It is not SendDefinition ObjectType

my raw xml looks like below

<ObjectType>EmailSendDefinition</ObjectType><Properties>Name</Properties><Properties>CategoryID</Properties><Filter xsi:type="SimpleFilterPart"><Property>CategoryID</Property><SimpleOperator>equals</SimpleOperator><Value>1234</Value></Filter>

set ClientIDs for RetrieveRequest

        var m_etclient = new etAPI.ClientID();
        m_etclient.ID = 123456;
        m_etclient.IDSpecified = true;
        rr.ClientIDs = new etAPI.ClientID[1];
        rr.ClientIDs[0] = m_etclient;