c# - Specified key was too long; max key length is 767 bytes Mysql error in Entity Framework 6

Question

I have start working on Asp.net Mvc-5 application using visual studio 2012. So I have downloaded Entity Framework-6 and MySQL 6.8.3.0 from nuget. When I tried to create database by using db Context command

dbContext.Database.CreateIfNotExists();

This exception thrown.

Specified key was too long; max key length is 767 bytes

I have done search on it, but cannot find any solution. One thing that I got during my search, this can be Unicode characters problem. I don't know how to deal with this issue.

Updated

I am using following configuration

<configuration>
  <configSections>
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
  </configSections>
  <entityFramework>
    <providers>
      <provider invariantName="MySql.Data.MySqlClient" type="MySql.Data.MySqlClient.MySqlProviderServices, MySql.Data.Entity.EF6" />
    </providers>
  </entityFramework>
  <system.data>
    <DbProviderFactories>
      <remove invariant="MySql.Data.MySqlClient" />
      <add name="MySQL Data Provider" invariant="MySql.Data.MySqlClient" description=".Net Framework Data Provider for MySQL" type="MySql.Data.MySqlClient.MySqlClientFactory, MySql.Data, Version=6.8.3.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d" />
    </DbProviderFactories>
  </system.data>
</configuration>

My DB Context class. I have removed all the models just keep left one model

public class MyContext : DbContext
{
    public MyContext()
        : base("myconn")
    {
        this.Configuration.ValidateOnSaveEnabled = false;
    }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Conventions.Remove<System.Data.Entity.ModelConfiguration.Conventions.PluralizingTableNameConvention>();
        base.OnModelCreating(modelBuilder);
    }

    public DbSet<ModelOne> ModelOne { get; set; }

}

Model class

public class  ModelOne
{
        [Key]
        public int CreatedId { get; set; }
        public Nullable<int> UserId { get; set; }
        public Nullable<DateTime> Date { get; set; }
        public string Description { get; set; }
  }

Can anyone help me with this issue?

Thank you.

Answer 1

I have changed the DbConfigurationType of DbContext.

Got from this this link stackoverflow

Now it is working

[DbConfigurationType(typeof(MySql.Data.Entity.MySqlEFConfiguration))]
public class MyContext : DbContext
{
    public MyContext()
        : base("myconn")
    {
        this.Configuration.ValidateOnSaveEnabled = false;
    }

    static MyContext()
    {
            DbConfiguration.SetConfiguration(new MySql.Data.Entity.MySqlEFConfiguration());
    }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Conventions.Remove<System.Data.Entity.ModelConfiguration.Conventions.PluralizingTableNameConvention>();
        base.OnModelCreating(modelBuilder);
    }

    public DbSet<ModelOne> ModelOne { get; set; }

}