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I am trying to retrieve all the columns from External list from sharepoint 2010. Em using the below code 

 SPListItemCollection collection = list.GetItems(query);

   foreach (SPField field in collection[0].Fields)
    {

    }

Here collection[0].Fields takes so much time. How can I avoid this perofrmance problem? Is there way of faster retrieval of items?

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do you have possibility to use LINQ? – Falak Mahmood Jun 9 '12 at 10:27
Yes. I see that the first access to SPListItemCollection object takes lot of time like 10-15 seconds in my case just to retrieve 5 items from list. What can be done to avoid this? – sharmila Jun 9 '12 at 10:41
have you used CAML to get the items collection? – Falak Mahmood Jun 9 '12 at 10:48
yes.. I am using CAML to get the collection . SPQuery query = new SPQuery(); query.Query ="<Where><IsNotNull><FieldRef Name='BdcIdentity'/></IsNotNull></Where>"; SPListItemCollection collection= list.GetItems(query); foreach (SPField field in collection[0].Fields) { //System.Diagnostics.Debug.Write(field.Title.ToString()); } Here first access to collection[0].Fields is very slow – sharmila Jun 9 '12 at 10:52
You have to include the fields you use in the code in the ViewFields node of the CAML query as FieldRef. Are you specifying RowLimit? – Falak Mahmood Jun 9 '12 at 10:55
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1 Answer

up vote 1 down vote accepted

BCS is a service application, and hence some WCF service calls will be involved. I don't think so CAML/SPList or LINQ will cause any good to improve performance, especially if external list is big. But to gain a huge performance impact it is best to define either a SpecificFinder-method to perform direct SQL-query or to add an Filter to the Finder-method to improve performance.

See more details: http://msdn.microsoft.com/en-us/library/ff464399.aspx

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