Validation failed for one or more entities. See ‘entityvalidationerrors’ solution

Validation failed for one or more entities.   See  ‘ EntityValidationErrors’   property for moredetails. Unfortunately, there is no further information about Workaround on how to view entityvalidationerrors details

In EF programming, we sometimes encounter such an error:

However, follow his prompt “see ‘entityvalidationerrors’ property for more details.” to check in the exception, you can only see

You can’t see the specific reason why the attribute fails to pass the verification. Maybe many people encounter this situation.

Here we introduce an exception class, so that we can easily know which field has a problem.

That is system.data.entity.validation.dbentityvalidationexception. I believe the code knows how to write it. The simplest is

try
{
// write database
}
catch (DbEntityValidationException dbEx)
{

}

We can see it in dbex

So we can see   Entityvalidationerrors details of all validation errors.