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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(227.2, 53%, 32%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMD%3C/text%3E%3C/svg%3E)
System.TypeLoadException: Method 'get_LockReleaseBehavior' in type 'MySql.EntityFrameworkCore.Migrations.Internal.MySQLHistoryRepository' from assembly 'MySql.EntityFrameworkCore, Version=0.0.0.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d' does not have an implementation.
This is probably a version mismatch in your Nuget packages. Review the project file and make sure you are using the right versions for your project.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(128, 8%, 22%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EA%3C/text%3E%3C/svg%3E)
Hi @Mathis De Sousa, it looks like the MySql.EntityFrameworkCore library you are using has a version mismatch or is incompatible with the version of Entity Framework Core (EF Core) you're working with. Please share your project file.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(304, 16%, 39%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EAD%3C/text%3E%3C/svg%3E)
Hi All,
Had the same issue on an identity server after a .net 9 update, this combination of libraries works.
"MySql.Data" Version="9.1.0"
"MySql.EntityFrameworkCore" Version="8.0.8"
"Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore" Version="8.0.8"
"Microsoft.AspNetCore.Identity.EntityFrameworkCore" Version="8.0.8"
"Microsoft.EntityFrameworkCore.Tools" Version="8.0.8"
MySql always seems to be the issue with updates and migrations. Be nice if they could release compatible libraries. Who knows when we will be able to use EF 9..
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(172.8, 75%, 26%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMP%3C/text%3E%3C/svg%3E)
Thank you @Andrew Downs !I can confirm that I am now able to scaffold and perform migrations with Mysql EF by installing the versions in your comment.
Was getting the error:
Method 'get_LockReleaseBehavior' in type 'MySql.EntityFrameworkCore.Migrations.Internal.MySQLHistoryRepository' from assembly 'MySql.EntityFrameworkCore, Version=0.0.0.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d' does not have an implementation.
Fixed using these packages:
dotnet add package Mysql.Data --version 9.1.0
dotnet add package Mysql.EntityFrameworkCore --version 8.0.8
dotnet add package Microsoft.EntityFrameworkCore.Tools --version 8.0.8
Quite confusing when you have some packages in version 9.0.x that are incompatible with the others. Maybe we'll have something better next year...
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(115.19999999999999, 80%, 21%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EPR%3C/text%3E%3C/svg%3E)
I had the same issue after the .NET 9 update, the following eventually worked for me via Nuget Package Manager:
Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore 8.0.8
Microsoft.AspNetCore.Identity.EntityFrameworkCore 8.0.8
Microsoft.EntityFrameworkCore.Design 8.0.11
Microsoft.EntityFrameworkCore.Tools 8.0.11
Microsoft.VisualStudio.Web.CodeGeneration.Design 8.0.7
Microsoft.VisualStudio.Web.CodeGeneration.EntityFrameworkCore 8.0.7
MySql.EntityFrameworkCore 8.0.8
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(275.2, 70%, 36%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EAP%3C/text%3E%3C/svg%3E)
I got the same thing after upgrading to .net 9 with Aspire.