C＃中的Microsoft CRM QueryExpression

Question

i have code like below:

QueryExpression query = new QueryExpression();
            query.EntityName = "new_callistyorder"; 
            ColumnSet col = new ColumnSet("new_nomororder","new_customer");
            query.ColumnSet = col;

            EntityCollection colect = service.RetrieveMultiple(query);

            string str = string.Empty;
            foreach (Entity e in colect.Entities)
            {
                if(e.Contains("new_nomororder")){
                str = str + e.Attributes["new_nomororder"].ToString();
                }
            }
            throw new InvalidPluginExecutionException(str);

Trough this code. I am able to get data from microsoft dynamic entity. Now, i want to get the data which have biggest id. If in SQL Query, it would be looks something like this : "Select top 1 my_id from Account order by my_id desc". How can i do that on queryexpression ? Thanks

Answer 1

You can add the order by using this:

query.AddOrder("my_id", OrderType.Descending);

and then getting the first element retrieved.

var entityCollection = service.RetrieveMultiple(query);
if(entityCollection.Entities.Count<1)
{
    //perform some logic
}