C#完成DataTable轉換成IList的辦法。本站提示廣大學習愛好者:(C#完成DataTable轉換成IList的辦法)文章只能為提供參考,不一定能成為您想要的結果。以下是C#完成DataTable轉換成IList的辦法正文
本文實例講述了C#完成DataTable轉換成IList的辦法。分享給年夜家供年夜家參考,詳細以下:
在用C#作開辟的時刻常常要把DataTable轉換成IList;操作DataTable比擬費事,把DataTable轉換成IList,以對象實體作為IList的元素,操作起來就異常便利。
留意:實體的屬性必需和數據庫中的字段必需逐個對應,或許數據庫字段名.ToLower().Contains(實體屬性名.ToLower())
數據類型臨時至支撐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> /// 獲得列名聚集 /// </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> ///屬性稱號和類型名的鍵值對聚集 /// </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轉換成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();//獲得實體類型的屬性聚集 Hashtable hh = GetColumnType(dt.Columns);//屬性稱號和類型名的鍵值對聚集 IList<string> colNames = GetColumnNames(hh);//依照屬性次序的列名聚集 List<T> list = new List<T>(); T model = default(T); foreach (DataRow dr in dt.Rows) { model = new T();//創立實體 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> /// 依照屬性次序的列名聚集 /// </summary> private IList<string> GetColumnNames(Hashtable hh) { PropertyInfo[] properties = typeof(T).GetProperties();//獲得實體類型的屬性聚集 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> /// 依據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 { //實體 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; } } }
願望本文所述對年夜家C#法式設計有所贊助。