实体框架:在泛型过滤器方法中使用DynamicLinq

using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Dynamic.Core;
using Microsoft.EntityFrameworkCore;

public class MyDbContext : DbContext
{
    public DbSet<MyEntity> MyEntities { get; set; }
}

public class MyEntity
{
    public int Id { get; set; }
    public string Name { get; set; }
    public int Age { get; set; }
}

public class MyRepository
{
    private readonly MyDbContext _dbContext;

    public MyRepository(MyDbContext dbContext)
    {
        _dbContext = dbContext;
    }

    public IEnumerable<MyEntity> GetEntitiesByFilter(string filterExpression)
    {
        return _dbContext.MyEntities.Where(filterExpression).ToList();
    }
}

public class Program
{
    public static void Main()
    {
        var dbContext = new MyDbContext();
        var repository = new MyRepository(dbContext);

        // 使用DynamicLinq构建过滤器表达式
        string filterExpression = "Age > 18";

        var entities = repository.GetEntitiesByFilter(filterExpression);

        foreach (var entity in entities)
        {
            Console.WriteLine($"Id: {entity.Id}, Name: {entity.Name}, Age: {entity.Age}");
        }
    }
}