ASP。Net核心与EF核心和CosmosDB.Net 5-身份问题

Question

我的问题和这个差不多。

ASP。Net Core与EF Core和CosmosDB-身份问题

提供的答案不起作用。这会产生其他问题。当我从升级我的应用程序时，这些错误开始出现。NET Core 3.1 to。净5。降级应用程序使所有错误都消失了。显然，这个问题与efcore 5中引入的对cosmos的乐观并发支持有关。

https://docs.microsoft.com/en-us/ef/core/what-is-new/ef-core-5.0/whatsnew#cosmos

任何帮助将不胜感激。

Answer 1

我认为这个样本可以帮助解决你的问题，我在我这边测试过，效果很好。

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net5.0</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.EntityFrameworkCore.Cosmos" Version="5.0.2" />
  </ItemGroup>

</Project>



using Microsoft.EntityFrameworkCore;

namespace Cosmos.ModelBuilding
{
    public class OrderContext : DbContext
    {
        public DbSet<Order> Orders { get; set; }
        public DbSet<Distributor> Distributors { get; set; }

        #region Configuration
        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
            => optionsBuilder.UseCosmos(
                "endpoint",
                "primarykey",
                databaseName: "Tasks");

        #endregion

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            #region DefaultContainer
            modelBuilder.HasDefaultContainer("Store");
            #endregion

            #region Container
            modelBuilder.Entity<Order>()
                .ToContainer("Orders");
            #endregion

            #region NoDiscriminator
            modelBuilder.Entity<Order>()
                .HasNoDiscriminator();
            #endregion

            #region PartitionKey
            modelBuilder.Entity<Order>()
                .HasPartitionKey(o => o.PartitionKey);
            #endregion

            #region ETag
            modelBuilder.Entity<Order>()
                .UseETagConcurrency();
            #endregion

            #region PropertyNames
            modelBuilder.Entity<Order>().OwnsOne(
                o => o.ShippingAddress,
                sa =>
                {
                    sa.ToJsonProperty("Address");
                    sa.Property(p => p.Street).ToJsonProperty("ShipsToStreet");
                    sa.Property(p => p.City).ToJsonProperty("ShipsToCity");
                });
            #endregion

            #region OwnsMany
            modelBuilder.Entity<Distributor>().OwnsMany(p => p.ShippingCenters);
            #endregion

            #region ETagProperty
            modelBuilder.Entity<Distributor>()
                .Property(d => d.ETag)
                .IsETagConcurrency();
            #endregion
        }
    }
}