sqldatareader 转实体类 方法1

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Reflection;
using System.Data;

/// <summary>
/// Summary description for ConvertEntity1
/// </summary>
public class ConvertEntity1
{
    public ConvertEntity1()
    {
        //
        // TODO: Add constructor logic here
        //
    }

    public static T ReaderToModel<T>(IDataReader dr)
    {
        try
        {
            using (dr)
            {
                if (dr.Read())
                {
                    Type modelType = typeof(T);
                    T model = Activator.CreateInstance<T>();
                    for (int i = 0; i < dr.FieldCount; i++)
                    {//, BindingFlags.GetProperty | BindingFlags.Public | BindingFlags.Instance | BindingFlags.IgnoreCase
                        PropertyInfo pi = modelType.GetProperty(GetPropertyName(dr.GetName(i)));
                        if (pi != null)
                        {
                            pi.SetValue(model, HackType(dr[i], pi.PropertyType), null);
                        }
                    }
                    return model;
                }
            }
            return default(T);
        }
        catch (Exception ex)
        {
            return default(T);
        }
    }

    public static List<T> ReaderToList<T>(IDataReader dr)
    {
        using (dr)
        {
            List<T> list = new List<T>();
            Type modelType = typeof(T);
            T model = Activator.CreateInstance<T>();
            while (dr.Read())
            {
                for (int i = 0; i < dr.FieldCount; i++)
                {
                    PropertyInfo pi = modelType.GetProperty(GetPropertyName(dr.GetName(i)), BindingFlags.GetProperty | BindingFlags.Public | BindingFlags.Instance | BindingFlags.IgnoreCase);
                    if (pi != null)
                    {
                        pi.SetValue(model, HackType(dr[i], pi.PropertyType), null);
                    }
                }
                list.Add(model);
            }
            return list;
        }
    }
    //这个类对可空类型进行判断转换，要不然会报错  
    private static object HackType(object value, Type conversionType)
    {
        if (conversionType.IsGenericType && conversionType.GetGenericTypeDefinition().Equals(typeof(Nullable<>)))
        {
            if (value == null)
                return null;

            System.ComponentModel.NullableConverter nullableConverter = new System.ComponentModel.NullableConverter(conversionType);
            conversionType = nullableConverter.UnderlyingType;
        }
        return Convert.ChangeType(value, conversionType);

    }

 

    private static bool IsNullOrDBNull(object obj)
    {

        return ((obj is DBNull) || string.IsNullOrEmpty(obj.ToString())) ? true : false;

    }

 

    //取得DB的列对应bean的属性名  

    private static string GetPropertyName(string column)
    {

        column = column.ToLower();

        string[] narr = column.Split('_');

        column = "";

        for (int i = 0; i < narr.Length; i++)
        {

            if (narr[i].Length > 1)
            {

                column += narr[i].Substring(0, 1).ToUpper() + narr[i].Substring(1);

            }

            else
            {

                column += narr[i].Substring(0, 1).ToUpper();

            }

        }

        return column;

    }

}