How do I update the PrimaryEntity of a CRM 2011 Workflow plugin from C#?

Question

So, ordinarily in a CRM Plugin, I would access the primary entity by using the following code:

(Entity)context.InputParameters["Target"]

I've noticed this still works from the Create context of a Workflow; however, from the ad-hoc usage, I must use the following:

context.PreEntityImages.FirstOrDefault().Value

At any rate, once I have the Primary Entity, I run into the nasty problem where the Context does not recognize this value as being the value already in context. I have tried using an explicit Attach and UpdateObject prior to using Update, however, I receive an exception telling me this entity is already in context under a different object.

I'm sure it'll be obvious in hindsight.

Thanks in advance.

Answer 1

通过将每个修改后的实体设置为context.UpdateObject然后通过context.SaveChanges保存（这是来自crmsvcutil的上下文），我解决了这个问题。