/****************数据库脚本*************** 
* create database MySchool 
* go 
* use MySchool 
* go 
* create table Student 
* ( 
* ID int identity primary key, 
* Name varchar(10) 
* ) 
* ****************************************/ 
using System; 
using System.Reflection; 
using System.Data.SqlClient; 
using System.Data; 
using System.Collections.Generic;

namespace ReflectionDemo 
{ 
#region Main 
class Program 
{ 
static void Main(string[] args) 
{ 
DataSet ds = new DataSet();

#region 连接数据库构建DataSet

//SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=MySchool;Integrated Security=True"); 
//SqlDataAdapter objAdapter = new SqlDataAdapter("Select * from student", con); 
//objAdapter.Fill(ds);

#endregion

#region 手动构建DataSet

DataTable dt = new DataTable(); 
dt.Columns.Add("ID"); 
dt.Columns.Add("Name"); 
DataRow row = dt.NewRow(); 
row["ID"] = 1; 
row["Name"] = "灰太狼"; 
dt.Rows.Add(row); 
ds.Tables.Add(dt); 
#endregion

List<Student> students = new List<Student>(); 
foreach (DataRow dataRow in ds.Tables[0].Rows) 
{ 
Student stu = new Student(); 
Utility.ConvertToEntity(stu, row); 
students.Add(stu); 
} 
foreach (Student student in students) 
{ 
Console.WriteLine(student.Name); 
} 
} 
} 
#endregion

#region 实体类

/// <summary> 
/// 实体类，需要在属性 
/// 上添加自定义特性 
/// 每个实体类对应数据表里 
/// 的一个字段，注意，自定义特性里的参数 
/// 一定要和数据表里的字段一一对应， 
/// 否则就反射不到了！ 
/// </summary> 
public class Student 
{ 
[DataContextAttribute("ID")] 
public int ID { get; set; } 
[DataContext("Name")] 
public string Name { get; set; } 
}

#endregion

#region 自定义特性

/// <summary> 
/// 自定义特性 
/// </summary> 
[AttributeUsage(AttributeTargets.Property)] 
public class DataContextAttribute : Attribute 
{ 
/// <summary> 
/// 自定义特性 
/// </summary> 
/// <param name="fieldName">数据表字段名称</param> 
public DataContextAttribute(string property) { this.Property = property; } 
/// <summary> 
/// 数据表字段属性(实体属性) 
/// </summary> 
public string Property { get; set; } 
}

#endregion

#region 反射

public class Utility 
{ 
/// <summary> 
/// 将DataRow转换成实体 
/// </summary> 
/// <param name="obj">实体</param> 
/// <param name="row">数据表一行数据</param> 
public static void ConvertToEntity(object obj, DataRow row) 
{ 
///得到obj的类型 
Type type = obj.GetType(); 
///返回这个类型的所有公共属性 
PropertyInfo[] infos = type.GetProperties(); 
///循环公共属性数组 
foreach (PropertyInfo info in infos) 
{ 
///返回自定义属性数组 
object[] attributes = info.GetCustomAttributes(typeof(DataContextAttribute), false); 
///将自定义属性数组循环 
foreach (DataContextAttribute attribute in attributes) 
{ 
///如果DataRow里也包括此列 
if (row.Table.Columns.Contains(attribute.Property)) 
{ 
///将DataRow指定列的值赋给value 
object value = row[attribute.Property]; 
///如果value为null则返回 
if (value == DBNull.Value) continue; 
///将值做转换 
if (info.PropertyType.Equals(typeof(string))) 
{ 
value = row[attribute.Property].ToString(); 
} 
else if (info.PropertyType.Equals(typeof(int))) 
{ 
value = Convert.ToInt32(row[attribute.Property]); 
} 
else if (info.PropertyType.Equals(typeof(decimal))) 
{ 
value = Convert.ToDecimal(row[attribute.Property]); 
} 
else if (info.PropertyType.Equals(typeof(DateTime))) 
{ 
value = Convert.ToDateTime(row[attribute.Property]); 
} 
else if (info.PropertyType.Equals(typeof(double))) 
{ 
value = Convert.ToDouble(row[attribute.Property]); 
} 
else if (info.PropertyType.Equals(typeof(bool))) 
{ 
value = Convert.ToBoolean(row[attribute.Property]); 
} 
///利用反射自动将value赋值给obj的相应公共属性 
info.SetValue(obj, value, null); 
} 
} 
} 
} 
}

#endregion 
}