C# · 12月 29, 2021

C#实现DataTable转换成IList的方法

本文实例讲述了C#实现DataTable转换成IList的方法。分享给大家供大家参考,具体如下:

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; } }}

更多关于C#相关内容感兴趣的读者可查看本站专题:《C#数据结构与算法教程》、《C#常见控件用法教程》、《C#面向对象程序设计入门教程》及《C#程序设计之线程使用技巧总结》

希望本文所述对大家C#程序设计有所帮助。