Duplicate Attribute in Entity Framework and Data Annotation error

Question

I have an MVC5 application running on .NET framework 4.7.1 in VS2017.

When I build my application, I am getting below error. Any suggestions as to how to resolve this issue?

The type 'TableAttribute' exists in both 'EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' and 'System.ComponentModel.DataAnnotations, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'

Attribute error

project references

You should explicitly express which of those TableAttributes you are using by i.e following way : [System.ComponentModel.DataAnnotations.Table] or by defining using-clauses correctly. — Risto M
– Risto M, Commented May 28, 2018 at 7:57
@RistoM This is my using classes that I've added. using System; using System.Collections.Generic; using System.ComponentModel.DataAnnotations; using System.ComponentModel.DataAnnotations.Schema; — LeoNegi
– LeoNegi, Commented May 28, 2018 at 7:59
Perhaps try as @RistoM suggests - [System.ComponentModel.DataAnnotations.Table] :) — David Hruška
– David Hruška, Commented May 28, 2018 at 8:03
Can you put screenshot of the Code line where this error happens? As others have said - the error is that [Table] attribute is defined in more than one Namespaces that are used in the code. And hence its causing some error. — Prateek Shrivastava
– Prateek Shrivastava, Commented May 28, 2018 at 8:14

Navid Golforoushan · Accepted Answer · 2018-09-18 19:22:20Z

4

Remove "System.ComponentModel.DataAnnotations" from References list Remove all attribute used by dataannotations like [Key],[StringLength].. also run

PM> update-package -reinstall

answered Sep 18, 2018 at 19:22

Navid Golforoushan

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