Why Can't I Update My EntitySet? A DefiningQuery and No UpdateFunction Issue

Error: Unable to Update EntitySet

Encountering the error "Unable to update the EntitySet - because it has a DefiningQuery and no element exists" often stems from the following causes:

• Entity set mapped from a database view
• A custom database query
• Database table without a primary key

Solutions:

• Remove Defining Query: If possible, remove the defining query from the entity set in the Entity Framework designer or by modifying your code.
• Add Primary Key: Ensure that the database table underlying the entity set has a primary key defined.
• Update Entity Framework Designer: Even after addressing the underlying issue, you may still need to update the Entity Framework designer. Delete the entity from the designer and then re-add it to refresh the metadata.

By addressing one of these underlying causes, you should be able to resolve the error and successfully update the entity set.

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