无法将类型“System.Collections.Generic.List<anonymous type:string ClassID,string ClsssName>”隐式转换为“System.Collections.Generic.List<Ecology.Model.EnergyFlowGraph>”

一、EF应用中，常见类型转换问题解决方案

public List<EnergyFlowGraph> GetData()
{
    var data = db.EnergyFlowGraph.Select(d => new
    {
        ClassID = d.ClassID,
        ParentClassID = d.ParentClassID,
        ClassName = d.ClassName,
    }).ToList();
     return data;
    //报错： 无法将类型“System.Collections.Generic.List<anonymous type:string ClassID,string ClsssName>”隐式转换为“System.Collections.Generic.List<Ecology.Model.EnergyFlowGraph>”   
    // 根据提示可知错误的原因 匿名类型anonymous type
    //d => new EnergyFlowGraph
    //解决方案一： new EnergyFlowGraph
    //var data = db.EnergyFlowGraph.Select(d => new EnergyFlowGraph
    //{
    //    ClassID = d.ClassID,
    //    ParentClassID = d.ParentClassID,
    //    ClassName = d.ClassName,
 
    //}).ToList();
    //return data;
    //解决方案二：foreach遍历
    //var list = new List<EnergyFlowGraph>();
    //foreach (var temp in data)
    //{
    //    var energyFlowGraph = new EnergyFlowGraph();
    //    energyFlowGraph.ClassID = temp.ClassID;
    //    energyFlowGraph.ClassName = temp.ClassName;
    //    energyFlowGraph.ParentClassID = temp.ParentClassID;
    //    list.Add(energyFlowGraph);
    //}
    //return list;
 
}

二、model类

namespace Ecology.Models
{
    using System;
    using System.Collections.Generic;
     
    public partial class EnergyFlowGraph
    {
        public string ClassID { get; set; }
        public string ParentClassID { get; set; }
        public string ClassName { get; set; }
 
    }
}