[英]How to set dynamic entity to dbcontext Entity Framework Core?
I got a method that receives an entity like string to return a list of that entity.我得到了一个方法,它接收一个像 string 这样的实体来返回该实体的列表。
What I want is set the entity dynamically and return the result.我想要的是动态设置实体并返回结果。
What I need is something like this:我需要的是这样的:
DbContext.Set <Type.GetType("Entity")>().Select(e => e);
This the error that I getting:这是我得到的错误:
Maybe this is not the correct to do so.也许这不是正确的做法。
The Set
method comes from Entity Framework Core. Set
方法来自 Entity Framework Core。
You Can Use Generic type Like Below:您可以使用如下的通用类型:
DbContext.Set<T>().Select(e => e);
but For this Your Method Should Works With Generics Like Example at below (This Code Not Tested ):但为此,您的方法应该适用于下面的示例(此代码未测试):
public Task<object> MyMethod<T>(T model)
{
// some Code
}
You Can Learn more About it in This Link您可以在此链接中了解更多信息
Sorry For Bad English.抱歉英语不好。 I Wish its Helps ...我希望它的帮助...
My entity class我的实体类
using System;
using System.Collections.Generic;
using System.Text;
namespace MyIdentityModel
{
public class IdentityRole
{
public long Id { get; set; }
public string Name { get; set; } = null!;
public DateTimeOffset CreatedAt { get; set; }
public bool Active { get; set; }
public bool Enabled { get; set; }
public DateTimeOffset ActiveUntil { get; set; }
}
}
My Context我的背景
using MyIdentityModel.Configuration;
using Microsoft.EntityFrameworkCore;
using System;
namespace MyIdentityModel
{
public abstract class IdentityDbContextBase: DbContext
{
public IdentityDbContextBase(DbContextOptions options) : base(options)
{
}
public DbSet<IdentityRole> Roles { get; set; } = null!;
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
modelBuilder.ApplyConfiguration(new IdentityRoleConfiguration());
}
}
}
Example Solution示例解决方案
I have 3 approachs我有 3 种方法
public List<TResult> GetList<TResult>(DbContext context, string entityTypeName)
where TResult : class
{
Type entityType = Type.GetType(entityTypeName); // get type of entity / MyIdentityModel.IdentityRole
var setMethod = context.GetType().GetMethod(nameof(DbContext.Set), new Type[] { }).MakeGenericMethod(entityType); //Get Method Set<MyIdentityModel.IdentityRole>
var dbSet = setMethod.Invoke(context, new object[] { }); // Calling context.Set<MyIdentityModel.IdentityRole>
/* Call to another methods using reflection before calling "ToList"
Eg. example Where, Include, Select
*/
var toListMethod = typeof(Enumerable).GetMethod("ToList").MakeGenericMethod(entityType); //get Extension Method "ToList<MyIdentityModel.IdentityRole>"
var list = (List<TResult>)toListMethod.Invoke(null, new object[] { dbSet });//Calling "context.Set<MyIdentityModel.IdentityRole>.ToList<MyIdentityModel.IdentityRole>()" Method and convert to destination type if is possible.
return list;
}
public List<TEntity> GetList2<TEntity>(DbContext context)
where TEntity : class
{
var setMethod = context.GetType().GetMethod(nameof(DbContext.Set), new Type[] { }).MakeGenericMethod(typeof(TEntity)); //Get Method Set<MyIdentityModel.IdentityRole>
var dbSet = setMethod.Invoke(context, new object[] { }); // Calling context.Set<MyIdentityModel.IdentityRole>
/* Call to another methods using reflection before calling "ToList"
Eg. example Where, Include, Select
*/
var toListMethod = typeof(Enumerable).GetMethod("ToList").MakeGenericMethod(typeof(TEntity)); //get Extension Method "ToList<MyIdentityModel.IdentityRole>"
var list = (List<TEntity>)toListMethod.Invoke(null, new object[] { dbSet });//Calling "context.Set<MyIdentityModel.IdentityRole>.ToList<MyIdentityModel.IdentityRole>()" Method and convert to destination type if is possible.
return list;
}
public List<TEntity> GetList3<TEntity>(DbContext context)
where TEntity : class
{
return context.Set<TEntity>()/* Call to another methods before "ToList" */.ToList();
}
the main program calls.主程序调用。
public List<TResult> GetList<TResult>(DbContext context, string entityTypeName)
public List<TEntity> GetList2<TEntity>(DbContext context)
public List<TEntity> GetList3<TEntity>(DbContext context)
Console.WriteLine("█ Result 1");
var result = GetList<MyIdentityModel.IdentityRole>(context, typeof(MyIdentityModel.IdentityRole).AssemblyQualifiedName);
Console.WriteLine(JsonSerializer.Serialize(result));
Console.WriteLine();
Console.Write("█ Result 2");
var result2 = GetList2<MyIdentityModel.IdentityRole>(context);
Console.WriteLine(JsonSerializer.Serialize(result2));
Console.WriteLine();
Console.Write("█ Result 3");
var result3 = GetList3<MyIdentityModel.IdentityRole>(context);
Console.WriteLine(JsonSerializer.Serialize(result3));
Console.WriteLine();
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