Errors in Net Core Add-Migration

Visual Studio 2017 version 15.5.2, Net Core 2.

Add-Migration error:

Exception calling "SetData" with "2" argument(s): "Type 
'Microsoft.VisualStudio.ProjectSystem.VS.Implementation.Package.Automation.OAProject' in 
assembly 'Microsoft.VisualStudio.ProjectSystem.VS.Implementation, Version=15.0.0.0, 
Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' is not marked as serializable."
At C:\Users\wanj\.nuget\packages\entityframework\6.2.0\tools\EntityFramework.psm1:720 char:5
+     $domain.SetData('project', $project)
+     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : SerializationException

Exception calling "SetData" with "2" argument(s): "Type 
'Microsoft.VisualStudio.ProjectSystem.VS.Implementation.Package.Automation.OAProject' in 
assembly 'Microsoft.VisualStudio.ProjectSystem.VS.Implementation, Version=15.0.0.0, 
Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' is not marked as serializable."
At C:\Users\wanj\.nuget\packages\entityframework\6.2.0\tools\EntityFramework.psm1:721 char:5
+     $domain.SetData('contextProject', $contextProject)
+     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : SerializationException

 Solution:
Check all the following three required NuGet packages are installed, https://developercommunity.visualstudio.com/content/problem/69983/enabling-ef-migrations-fails-with-error.html:
  • Microsoft.EntityFrameworkCore
  • Microsoft.EntityFrameworkCore.Tools
  • Microsoft.EntityFrameworkCore.SqlServer
  1. Remove previously installed EntityFramework (v6.2.0) and install Microsoft.EntityFrameworkCore instead.
  2.  Update all  to the newest versions

Run EntityFrameworkCore\Add-Migration again, the above error is gone, but a new error showed up:

More than one DbContext was found. Specify which one to use. Use the '-Context' parameter for PowerShell commands and the '--context' parameter for dotnet commands.

Solution:
Add-Migration MyMigrationName -context LibProgramContext

See https://stackoverflow.com/questions/38162227/asp-net-core-ef-add-migration-command-not-working

Comments

Post a Comment

Popular posts from this blog

Use GnuPG Tools or C# Code for PGP Encryption and Signature

For PGP encryption and signature, usually we use PGP command line tools for test purpose and finally use C# application for production. Mine is a Net Core 2.0 console application using NuGet package PgpCore,  https://github.com/mattosaurus/PgpCore. PgpCore is based on BouncyCastle.NetCore which supports the standard OpenPGP keys. Here w use the popular GnuPG (GPG) tools to generate OpenPGP key pair. Download and Install GPG for Windows Download from  https://gpg4win.org/download.html . By default the installation will create two folders (here we use command line tools only): Gpg4Win UI (Kleopatra): C:\Program Files (x86)\Gpg4win Command line tools: C:\Program Files (x86)\GnuPG\bin Generate a GPG Key Pair For GnuPG 2.2.1 and above:     C:\Program Files (x86)\GnuPG\bin> gpg --full-generate-key For old versions of GnuPG:     C:\Program Files (x86)\GnuPG\bin> gpg --gen-key Common GPG Commands List public keys: gpg --list-key or gpg -k List private keys: gpg
Read more

Confusing Concepts about SFTP: SSH2 vs OpenSSH

Credit and copied from https://dada.tw/2008/01/03/70/ Terminology: SSH Protocols and Products SSH A generic term referring to SSH protocols or software products. SSH-1 The SSH protocol, Version 1. This protocol went through several revisions, of which 1.3 and 1.5 are the best known, and we will write SSH-1.3 and SSH-1.5 should the distinction be necessary. SSH-2 The SSH protocol, Version 2, as defined by several draft standards documents of the IETF SECSH working group. SSH1 Tatu Ylönen's software implementing the SSH-1 protocol; the original SSH. Now distributed and maintained (minimally) by SSH Communications Security, Inc. SSH2 The "SSH Secure Shell" product from SSH Communications Security, Inc. This is a commercial SSH-2 protocol implementation, though it is licensed free of charge in some circumstances. ssh (all lowercase letters) A client program included in SSH1, SSH2, OpenSSH, F-Secure SSH, and other
Read more