Ef(EntityFramework) select 操作后Map到實體類型的方法

使用Ef 一直以來都有一個問題困擾着我,就是select 操作后在View頁面 Render的時候非常麻煩，今日終於不勝其擾，下了一個方法，供大家參考。

controller ：

 

            var articleEntity = articleRepo.List().Where(x => x.AreaList.Select(s => s.Name).Contains("首頁")).Select(x => new
            {
                Title = x.Title,
                AreaList = x.AreaList,
                CoverPic = x.CoverPic
            }).ToList().Map<List<Article>>();

 

Map方法：

 public static T Map<T>(this object obj)
            where T : class, new()
        {
            var objType = obj.GetType();

            if (objType.GetInterface("IList") == null)
            {
                T t = new T();

                var srcType = t.GetType();

                var srcTypeProps = srcType.GetProperties();

                foreach (var property in objType.GetProperties())
                {
                    var srcTypeProp = srcTypeProps.FirstOrDefault(x => x.Name == property.Name);

                    if (srcTypeProp != null)
                    {
                        srcTypeProp.SetValue(t, property.GetValue(obj));
                    }
                }

                return t;
            }
            else
            {
                //obj 包含IList 接口則 T必須包含 
                try
                {
                    var srcType = typeof(T);

                    if (srcType.GetInterface("IList") == null)
                    {
                        throw new Exception("數據值與目標值包含的結構不一致");
                    }

                    var t = new T() as IList;

                    var objArgumentType = objType.GenericTypeArguments[0];

                    var objArgumentTypeProps = objArgumentType.GetProperties();

                    //獲取泛型類型
                    var srcTargetType = srcType.GenericTypeArguments[0];

                    var srcTargetTypeProps = srcTargetType.GetProperties();

                    foreach (var objItem in obj as IList)
                    {
                        var srcTargetTypeInstance = Activator.CreateInstance(srcTargetType);

                        foreach (var property in objArgumentTypeProps)
                        {
                            var srcProp = srcTargetTypeProps.FirstOrDefault(x => x.Name == property.Name);

                            if (srcProp != null)
                            {
                                srcProp.SetValue(srcTargetTypeInstance, property.GetValue(objItem));
                            }

                            //if (srcTargetTypeProps.Select(x => x.Name).Contains(property.Name))
                            //{注意:這里因為用的objProp 給 srcTargetInstance 賦值,因為兩者屬於不同的類型,所以不可進行此操作.遂使用上方的方法,由srcProp給srcTargetInstance賦值
                            //    property.SetValue(srcTargetTypeInstance, property.GetValue(objItem));
                            //}
                        }

                        //第二種方式
                        //foreach (var property in srcTargetTypeProps)
                        //{
                        //    var objProperty = objArgumentTypeProps.FirstOrDefault(x => x.Name == property.Name);

                        //    if (objProperty != null)
                        //    {
                        //        property.SetValue(srcTargetTypeInstance, objProperty.GetValue(objItem));
                        //    }
                        //}

                        t.Add(srcTargetTypeInstance);
                    }

                    return t as T;
                }
                catch (Exception exc)
                {
                    throw;
                }
            }
        }

 

僅對IList接口做了處理，有需要的朋友可以繼續擴展其他接口