Vs cannot find the error! Validation failed for one or more entities, validationentities

Vs cannot find the error! Validation failed for one or more entities, validationentities

When processing the Entity Framework modification database today, an error is reported:

Validation failed for one or more entities. See 'entityvalidationerrors 'property for more details.

The reason cannot be found.

Generally, try catch (Exception ex) is used to check the error, but the error cannot be found in this case.

A viewing error mechanism of System. Data. Entity. Validation. DbEntityValidationException is used.

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

Right-click "add monitoring" on dbex to check that the data format of a field is incorrect (there is a space at the end)

In this way, it is better to handle errors than exception in some cases.