TypeLoadException: Method 'Create' in type ... does not have an implementation (Error Below)

user_14437869 0
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I published my program onto an Azure Website and this error arose:

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The error only seems to occur when I try to add data to the connected Azure SQL Server, or pull (some of the) data from the Azure SQL Server. Could this be a dependency issue? If so, I'm using a netcoreapp3.1 with Microsoft.EntityFrameworkCore.SqlServer version 3.1.4. Here is a further screenshot of the other NuGet packages and their versions:

enter image description here

I've tried to look elsewhere to find a solution to this problem, but this seems to be a one-of-a-kind issue specific to my program. Let me know if any other information is needed as I'm not sure what this error is truly rooting from.

entity-framework-core azure c#
2 Answers

Basically, the error message means that Microsoft.EntityFrameworkCore.SqlServer.Query.Internal.SqlServerSqlTranslatingExpressionVisitorFactory type has a mention of Create method in your code/library, but it is unable to find it as there is a wrong version's reference of the nuget package in which Create method is not present.

Please note that all the following packages should be of same version:

  • Microsoft.EntityFrameworkCore.Tools
  • Microsoft.EntityFrameworkCore
  • Microsoft.AspNetCore.Identity.EntityFrameworkCore
  • Microsoft.EntityFrameworkCore.Design
  • Microsoft.EntityFrameworkCore.SqlServer

For example, all of these can be of 3.1.4 version. Check out exact same issue around this: I get an error when I add migration using Entity Framework Core

If this does not work, you might want to check out this solution.

user_50141740

I resolved the issue after using in NuGet

Add-Migration Initial Update-Database

user_139896760
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