问题
I get the error:
Ambiguous match found
During this code on the .Add
var db = new NexusEntities();
db.Reports.Add(mmr);
From googling it appears to be an issue if the there are two classes with the same name but in different namespaces. As far as I can tell this is not the case... Is there another reason why this error can happen? Or is there a way to tell which parameter it is finding two of?
回答1:
This is a "weakness" in EF. It happens when the same property appears in class / subtype hierarchy.
Most likely you have a hidden field. i.e. a property that has been redefined. When EF looks for the a property it too must use the type/base tree to find the property. But if it finds it twice in the tree, it interprets this as a duplicate. EF doesnt just use the lowest most specific override.
So property hiding is not possible with EF.
Check your classes, a property will occur twice somewhere.
回答2:
Although this is probably a much less likely scenario, but we were running EF Core 1.0 which had only one version of the Include() method... in version 1.1, Microsoft added a second implementation (the string version) and since we were calling this method dynamically we got this error after updating our EF Core to 1.1
来源：https://stackoverflow.com/questions/18245686/entity-framework-exception-ambiguous-match-found