DataTable转换成IList

//文章出处:

http://www.cnblogs.com/hlxs/archive/2011/05/09/2087976.html　

DataTable转换成IList

在用C#作开发的时候经常要把DataTable转换成IList；操作DataTable比较麻烦，把DataTable转换成IList，以对象实体作为IList的元素，操作起来就非常方便。

注意：实体的属性必须和数据库中的字段必须一一对应，或者数据库字段名.ToLower().Contains(实体属性名.ToLower())

          数据类型暂时至支持int、string、DateTime、float、double

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

namespace TBToListTest{    public class TBToList<T> where T : new()    {        /// <summary>        /// 获取列名集合        /// </summary>        private IList<string> GetColumnNames(DataColumnCollection dcc)        {            IList<string> list = new List<string>();            foreach (DataColumn dc in dcc)            {                list.Add(dc.ColumnName);            }            return list;        }

        /// <summary>        ///属性名称和类型名的键值对集合        /// </summary>        private Hashtable GetColumnType(DataColumnCollection dcc)        {            if (dcc == null || dcc.Count == 0)            {                return null;            }            IList<string> colNameList = GetColumnNames(dcc);

            Type t = typeof(T);            PropertyInfo[] properties = t.GetProperties();            Hashtable hashtable = new Hashtable();            int i = 0;            foreach (PropertyInfo p in properties)            {                foreach (string col in colNameList)                {                    if (col.ToLower().Contains(p.Name.ToLower()))                    {                        hashtable.Add(col, p.PropertyType.ToString() + i++);                    }                }            }

            return hashtable;        }

        /// <summary>        /// DataTable转换成IList        /// </summary>        /// <param name="dt"></param>        /// <returns></returns>        public IList<T> ToList(DataTable dt)        {            if (dt == null || dt.Rows.Count == 0)            {                return null;            }

            PropertyInfo[] properties = typeof(T).GetProperties();//获取实体类型的属性集合            Hashtable hh = GetColumnType(dt.Columns);//属性名称和类型名的键值对集合            IList<string> colNames = GetColumnNames(hh);//按照属性顺序的列名集合            List<T> list = new List<T>();            T model = default(T);            foreach (DataRow dr in dt.Rows)            {                model = new T();//创建实体                int i = 0;                foreach (PropertyInfo p in properties)                {                    if (p.PropertyType == typeof(string))                    {                        p.SetValue(model, dr[colNames[i++]], null);                    }                    else if (p.PropertyType == typeof(int))                    {                        p.SetValue(model, int.Parse(dr[colNames[i++]].ToString()), null);                    }                    else if (p.PropertyType == typeof(DateTime))                    {                        p.SetValue(model, DateTime.Parse(dr[colNames[i++]].ToString()), null);                    }                    else if (p.PropertyType == typeof(float))                    {                        p.SetValue(model, float.Parse(dr[colNames[i++]].ToString()), null);                    }                    else if (p.PropertyType == typeof(double))                    {                        p.SetValue(model, double.Parse(dr[colNames[i++]].ToString()), null);                    }                }

                list.Add(model);            }

            return list;        }

        /// <summary>        /// 按照属性顺序的列名集合        /// </summary>        private IList<string> GetColumnNames(Hashtable hh)        {            PropertyInfo[] properties = typeof(T).GetProperties();//获取实体类型的属性集合            IList<string> ilist = new List<string>();            int i = 0;            foreach (PropertyInfo p in properties)            {                ilist.Add(GetKey(p.PropertyType.ToString() + i++, hh));            }            return ilist;        }

        /// <summary>        /// 根据Value查找Key        /// </summary>        private string GetKey(string val, Hashtable tb)        {            foreach (DictionaryEntry de in tb)            {                if (de.Value.ToString() == val)                {                    return de.Key.ToString();                }            }            return null;        }

    }}

namespace TBToListTest{

   //实体    public class Person    {        public int ID        {            set;            get;        }

        public string Name        {            set;            get;        }

        public string Age        {            set;            get;        }

        public string Lover        {            set;            get;        }

    }}

using System;using System.Data;

namespace TBToListTest{    class Program    {        static void Main(string[] args)        {            TBToList<Person> tol = new TBToList<Person>();            Console.WriteLine();            DataTable dt =  GetTable();            tol.ToList(dt);            Console.Read();        }

        public static DataTable GetTable()        {            DataTable dt = new DataTable();            dt.Columns.Add("ID");            dt.Columns.Add("Age");            dt.Columns.Add("Lover");            dt.Columns.Add("Name");            DataRow dr = dt.NewRow();            dr["ID"] = 1;            dr["Age"] = "Age1";            dr["Lover"] = "Lover1";            dr["Name"] = "Name1";            dt.Rows.Add(dr);            DataRow dr1 = dt.NewRow();            dr1["ID"] = 2;            dr1["Age"] = "Age2";            dr1["Lover"] = "Lover2";            dr1["Name"] = "Name2";            dt.Rows.Add(dr1);            return dt;        }    }}