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ASP.NET Identity using MySQL and Entity Framework


ASP.NET Identity using MySQL and Entity Framework

By : user2948660
Date : November 14 2020, 04:51 PM
hop of those help? I fixed a similar issue by modifying my ApplicationDbContext's OnModelCreating method:
from
code :
    modelBuilder
        .Entity<IdentityUser>()
        .Property(p => p.UserName)
        .HasMaxLength(255);
    modelBuilder
        .Entity<ApplicationUser>()
        .Property(p => p.UserName)
        .HasMaxLength(255);


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Entity Framework Code First Using Guid as Identity with another Identity Column

Entity Framework Code First Using Guid as Identity with another Identity Column


By : Joseph Mcrae
Date : March 29 2020, 07:55 AM
it fixes the issue This ended up working for me, Entity Framework 5.
Turn off automatic migrations Migrate to create the initial table, no frills
code :
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public override int ClusterId { get; set; }
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public override Guid Id { get; set; }
Identity Entity Framework Library - Update Database [MySQL]

Identity Entity Framework Library - Update Database [MySQL]


By : Lukas Endigo
Date : March 29 2020, 07:55 AM
it helps some times You may want to check out this tutorial: http://www.asp.net/mvc/tutorials/security/aspnet-identity-using-mysql-storage-with-an-entityframework-mysql-provider - specifically the section "Adding custom MigrationHistory context" which explains how to set a custom HistoryContext to get around the primary key size problem.
Visual Studio 2017 + entity framework + identity + mysql not working

Visual Studio 2017 + entity framework + identity + mysql not working


By : ikee
Date : March 29 2020, 07:55 AM
around this issue That tutorial is from 2013. MySQL connector doesn't yet support visual studio 2017, It's expected shortly, in the meantime Devart has a connector that works with Visual Studio 2017 and MySQL.
Edit
EF6 vs Entity Framework Core : Insert an entity without resetting the primary key (identity) to zero

EF6 vs Entity Framework Core : Insert an entity without resetting the primary key (identity) to zero


By : Archana Bhardwaj
Date : March 29 2020, 07:55 AM
like below fixes the issue Unfortunately currently (as of EF Core 2.0.1) this behavior is not controllable. I guess it's supposed to be improvement from EF6 since it allows you to perform identity inserts.
Fortunately EF Core is build on service based architecture which allows you ( (although not so easily) to replace almost every aspect. In this case, the responsible service is called IValueGenerationManager and is implemented by ValueGenerationManager class. The lines that provide the aforementioned behavior are
code :
private static IEnumerable<IProperty> FindPropagatingProperties(InternalEntityEntry entry)    
    => entry.EntityType.GetProperties().Where(    
        property => property.IsForeignKey()    
                    && property.ClrType.IsDefaultValue(entry[property]));

private static IEnumerable<IProperty> FindGeneratingProperties(InternalEntityEntry entry)    
    => entry.EntityType.GetProperties().Where(    
        property => property.RequiresValueGenerator()    
                    && property.ClrType.IsDefaultValue(entry[property]));
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Threading;
using Microsoft.EntityFrameworkCore.ChangeTracking.Internal;
using Microsoft.EntityFrameworkCore.ValueGeneration;
using Microsoft.EntityFrameworkCore.Metadata;
using Microsoft.EntityFrameworkCore.Metadata.Internal;

namespace Microsoft.EntityFrameworkCore
{
    public static class Extensions
    {
        public static DbContextOptionsBuilder UseEF6CompatibleValueGeneration(this DbContextOptionsBuilder optionsBuilder)
        {
            optionsBuilder.ReplaceService<IValueGenerationManager, EF6CompatibleValueGeneratorManager>();
            return optionsBuilder;
        }
    }
}

namespace Microsoft.EntityFrameworkCore.ChangeTracking.Internal
{
    public class EF6CompatibleValueGeneratorManager : ValueGenerationManager
    {
        private readonly IValueGeneratorSelector valueGeneratorSelector;
        private readonly IKeyPropagator keyPropagator;

        public EF6CompatibleValueGeneratorManager(IValueGeneratorSelector valueGeneratorSelector, IKeyPropagator keyPropagator)
            : base(valueGeneratorSelector, keyPropagator)
        {
            this.valueGeneratorSelector = valueGeneratorSelector;
            this.keyPropagator = keyPropagator;
        }

        public override InternalEntityEntry Propagate(InternalEntityEntry entry)
        {
            InternalEntityEntry chosenPrincipal = null;
            foreach (var property in FindPropagatingProperties(entry))
            {
                var principalEntry = keyPropagator.PropagateValue(entry, property);
                if (chosenPrincipal == null)
                    chosenPrincipal = principalEntry;
            }
            return chosenPrincipal;
        }

        public override void Generate(InternalEntityEntry entry)
        {
            var entityEntry = new EntityEntry(entry);
            foreach (var property in FindGeneratingProperties(entry))
            {
                var valueGenerator = GetValueGenerator(entry, property);
                SetGeneratedValue(entry, property, valueGenerator.Next(entityEntry), valueGenerator.GeneratesTemporaryValues);
            }
        }

        public override async Task GenerateAsync(InternalEntityEntry entry, CancellationToken cancellationToken = default(CancellationToken))
        {
            var entityEntry = new EntityEntry(entry);
            foreach (var property in FindGeneratingProperties(entry))
            {
                var valueGenerator = GetValueGenerator(entry, property);
                SetGeneratedValue(entry, property, await valueGenerator.NextAsync(entityEntry, cancellationToken), valueGenerator.GeneratesTemporaryValues);
            }
        }

        static IEnumerable<IProperty> FindPropagatingProperties(InternalEntityEntry entry)
        {
            return entry.EntityType.GetProperties().Where(property => property.IsForeignKey());
        }

        static IEnumerable<IProperty> FindGeneratingProperties(InternalEntityEntry entry)
        {
            return entry.EntityType.GetProperties().Where(property => property.RequiresValueGenerator());
        }

        ValueGenerator GetValueGenerator(InternalEntityEntry entry, IProperty property)
        {
            return valueGeneratorSelector.Select(property, property.IsKey() ? property.DeclaringEntityType : entry.EntityType);
        }

        static void SetGeneratedValue(InternalEntityEntry entry, IProperty property, object generatedValue, bool isTemporary)
        {
            if (generatedValue == null) return;
            entry[property] = generatedValue;
            if (isTemporary)
                entry.MarkAsTemporary(property, true);
        }
    }
}
protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
    // ...
    optionsBuilder.UseEF6CompatibleValueGeneration();
}
Entity Framework - Database generated identity is not populated after save if it is not the key of the entity

Entity Framework - Database generated identity is not populated after save if it is not the key of the entity


By : Imdaman
Date : March 29 2020, 07:55 AM
it helps some times Disclaimer: I'm the owner of Entity Framework Extensions
It was indeed an issue in our library. This scenario was not yet supported for EF6.
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