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