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;

}

}