We_Message/MqttMsgServer/Dao/ApplicationDbContext.cs

using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using ConsoleHttp.Model;
using MqttMsgServer.Model;

namespace MqttMsgServer.Dao
{
    public class ApplicationDbContext:DbContext
    {
       
        public ApplicationDbContext():base(AppSetting.GetValue("SqlServerConnectionString"))
        {
           // Database.SetInitializer(new DropCreateDatabaseIfModelChanges<ApplicationDbContext>());
        }

        public IDbSet<ClientInfos> ClientInfos { get; set; }

        public IDbSet<ReceiveMessageRecord> ReceiveMessageRecords { get; set; }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
         
            base.OnModelCreating(modelBuilder);
            modelBuilder.Entity<ClientInfos>().Property(i=>i.Id).HasMaxLength(50);
            modelBuilder.Entity<ReceiveMessageRecord>().Property(i=>i.Id).HasMaxLength(50);
        }
    }
}