Addorupdate sequence contains more than one element

2020-02-26 14:42 Jun 13, 2014 Sequence contains more than one element. For information about how to handle redundant data such as two students named Alexander Carson , see Seeding and Debugging Entity Framework (EF) DBs on Rick Anderson's blog. For more information about the AddOrUpdate method, see Take care with EF 4. 3 AddOrUpdate Method on Julie Lerman's blog.

Oct 17, 2013 i. Title, This code assumes that titles are unique. If you manually add a duplicate title, you'll get the following exception the next time you perform a migration. Sequence contains more than one element. For more information about the AddOrUpdate method, see Take care with EF 4. 3 AddOrUpdate Method. . addorupdate sequence contains more than one element

Sequence contains more than one element. This exception was caused when trying to use AddOrUpdate with specifying identifier expression, like p p. CategoryName. There might be two Categories that have the same name Sport or Music . . This might also happen on Subcategories and Services, Subcategories uses p p. SubcategoryName and Services uses p p. ServiceType.

Jul 22, 2015  To avoid the Sequence contains ore than one element, my experience is this: 1. when using AddOrUpdate, give more condition like this: p. CategoryName, p. SubCategoryName, category) addorupdate sequence contains more than one element

Oct 07, 2014 This can happen if you are using the AddOrUpdate method and use e. g. LastName as the property to do the checking against: p. LastName, s) This code assumes that last names are unique. After reading the article in the link that you have provided, I did the following changes in my models, and created controllers for each of them using Entity Framework, then I Jul 22, 2015 To avoid the 'Sequence contains ore than one element my experience is this: 1. when using AddOrUpdate, give more condition like this: p. CategoryName, p. SubCategoryName, category) 2. there are times that we may have duplicated record in the database, go to the database, delete the duplication and run updatedatabase again. addorupdate sequence contains more than one element AddOrUpdate(IDbSet Asynchronously determines whether a sequence contains a specified element by using the default equality comparer. only element of a sequence, or a default value if the sequence is empty; this method throws an exception if there is more than one element in the sequence. Kind of what i wanted to avoid. This loop can be rather long so deleting upwards of 100 to 200 records 1 at a time seems pretty draining compared to a single deletion of all those records. You are using Linq method SingleOrDefault, which will throw exception if more than one element will be found in the query. If you anticipate that predicate can match more than one element you could use method FirstOrDefault which will get firs matching element or return null if not found or change the predicate to be more detailed.

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