如何使用实体框架对datatable中的表进行分组和求和

// 创建实体类
public class MyEntity
{
    public int Id { get; set; }
    public string Name { get; set; }
    public decimal Value { get; set; }
}

// 创建实体数据上下文
public class MyDbContext : DbContext
{
    public DbSet<MyEntity> MyEntities { get; set; }

    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        optionsBuilder.UseSqlServer("YourConnectionString"); // 替换为你的数据库连接字符串
    }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<MyEntity>().ToTable("MyTable"); // 替换为你的表名
    }
}

// 查询数据并进行分组和求和
public void GroupAndSumDataTable(DataTable dataTable)
{
    // 将DataTable转换为List<MyEntity>
    List<MyEntity> entities = dataTable.AsEnumerable().Select(row =>
        new MyEntity
        {
            Id = Convert.ToInt32(row["Id"]),
            Name = row["Name"].ToString(),
            Value = Convert.ToDecimal(row["Value"])
        }).ToList();

    // 使用实体数据上下文进行查询
    using (var dbContext = new MyDbContext())
    {
        var result = dbContext.MyEntities
            .GroupBy(e => e.Name) // 按照Name字段进行分组
            .Select(g => new
            {
                Name = g.Key,
                SumValue = g.Sum(e => e.Value) // 对Value字段进行求和
            }).ToList();

        // 输出结果
        foreach (var item in result)
        {
            Console.WriteLine($"Name: {item.Name}, SumValue: {item.SumValue}");
        }
    }
}