將實體DATATABLE進行轉換

通過反射填充泛型集合List的靜態方法

如何通過反射,從DataReader將數據填充到數據實體泛型集合的靜態方法.

 

//Kchen.Core.BaseBusinessObject爲通用數據實體類,此處僅爲限定T所繼承的類型
        public static IList<T> FillDataListGeneric<T>(System.Data.IDataReader reader) where T : Kchen.Core.BaseBusinessObject  //,new()
        {
            //實例化一個List<>泛型集合
            IList<T> DataList = new List<T>();
            while (reader.Read())
            {
                //由於是是未知的類型,所以必須通過Activator.CreateInstance<T>()方法來依據T的類型動態創建數據實體對象
                T RowInstance = Activator.CreateInstance<T>();

                //T加了NEW()後就可以直接實例化了  T RowInstance  = new T();
                //通過反射取得對象所有的Property
                foreach (PropertyInfo Property in typeof(T).GetProperties())
                {
                    //BindingFieldAttribute爲自定義的Attribute,用於與數據庫字段進行綁定
                    foreach (BindingFieldAttribute FieldAttr in Property.GetCustomAttributes(typeof(BindingFieldAttribute), true))
                    {
                        try
                        {
                            //取得當前數據庫字段的順序
                            int Ordinal = reader.GetOrdinal(FieldAttr.FieldName);
                            if (reader.GetValue(Ordinal) != DBNull.Value)
                            {
                                //將DataReader讀取出來的數據填充到對象實體的屬性裏
                                Property.SetValue(RowInstance, Convert.ChangeType(reader.GetValue(Ordinal), Property.PropertyType), null);
                            }
                        }
                        catch
                        {
                            break;
                        }
                    }
                }
                //將數據實體對象add到泛型集合中
                DataList.Add(RowInstance);
            }
            return DataList;
        }
調用的時候使用如下代碼

            //僞代碼 OleDbDataReader _ds = 創建一個OleDbDataReader
            IList<Product> _result = Kchen.Utilities.FillDataListGeneric<Product>(_ds);

此靜態方法通過一個實體類型和DateReader,快速的將數據填充到數據實體泛型集合中.

 

本文來自CSDN博客，轉載請標明出處：http://blog.csdn.net/wfz131/archive/2008/11/21/3345071.aspx