利用反射把数据库查询到的数据转换成Model、List（改良版）

之前也写过一篇这样的博文，但是非常的粗糙。    博文地址

后来看到了一位前辈(@勤快的小熊)对我的博文的评论后，让我看到了更加优雅的实现方式，于是重构了之前的代码。

 public static List<T> ConvertToList<T>(DataTable dt)
         {
             List<T> list = new List<T>(); // 定义集合
             Type type = typeof(T); // 获得此模型的类型
             string tempName = "";
             PropertyInfo[] propertys = type.GetProperties();// 获得此模型的公共属性
             foreach (DataRow dr in dt.Rows)
             {
                 //新建一个模型
                 object obj = type.Assembly.CreateInstance(type.FullName);
                 foreach (PropertyInfo pi in propertys)
                 {
                     tempName = pi.Name;
                     if (dt.Columns.Contains(tempName))
                     {
                         if (!pi.CanWrite) continue;
                         object value = dr[tempName];
                         if (value != DBNull.Value)
                             pi.SetValue(obj, value, null);
                     }
                 }
                 list.Add((T)obj);
             }
             return list;
         }

         public static List<T> ConvertToList<T>(IDataReader reader)
         {
             List<T> list = new List<T>(); // 定义集合
             Type type = typeof(T); // 获得此模型的类型
             string tempName = "";
             PropertyInfo[] propertys = type.GetProperties();// 获得此模型的公共属性
             while (reader.Read())
             {
                 //新建一个模型
                 object obj = type.Assembly.CreateInstance(type.FullName);
                 foreach (PropertyInfo pi in propertys)
                 {
                     tempName = pi.Name;
                     if (ReaderExists(reader, tempName))
                     {
                         if (!pi.CanWrite) continue;
                         object value = reader[tempName];
                         if (value != DBNull.Value)
                             pi.SetValue(obj, value, null);
                     }
                 }
                 list.Add((T)obj);
             }
             return list;
         }

         public static T ConvertToModel<T>(IDataReader reader)
         {
             Type type = typeof(T);
             PropertyInfo[] proList = type.GetProperties();
             //新建一个模型
             object obj = type.Assembly.CreateInstance(type.FullName);
             string tempName = "";
             if (reader.Read())
             {
                 foreach (PropertyInfo pi in proList)
                 {
                     tempName = pi.Name;
                     if (ReaderExists(reader, pi.Name))
                     {
                         if (!pi.CanWrite) continue;
                         object value = reader[tempName];
                         if (value != DBNull.Value)
                             pi.SetValue(obj, value, null);
                     }
                 }
             }
             return (T)obj;
         }

         public static T ConvertToModel<T>(DataRow row)
         {
             Type type = typeof(T);
             PropertyInfo[] proList = type.GetProperties();
             //新建一个模型
             object obj = type.Assembly.CreateInstance(type.FullName);
             string tempName = "";
             foreach(PropertyInfo pi in proList)
             {
                 tempName = pi.Name;
                 if (!string.IsNullOrEmpty(row[tempName].ToString()))
                 {
                     if (!pi.CanWrite) continue;
                     object value = row[tempName];
                     if (value != DBNull.Value)
                         pi.SetValue(obj, value, null);
                 }
             }
             return (T)obj;
         }

         /// <summary>
         /// 验证reader是否存在某列
         /// </summary>
         /// <param name="reader"></param>
         /// <param name="columnName"></param>
         /// <returns></returns>
         private static bool ReaderExists(IDataReader reader,string columnName)
         {
             int count = reader.FieldCount;
             for(int i = ; i < count; i++)
             {
                 if(reader.GetName(i).Equals(columnName))
                 {
                     return true;
                 }
             }
             return false;
         }