1、DataTable 轉 泛型T的List 2、DataTable 轉 HashTable 3、DataTable 轉 HashTable 4、DataTable 按照某列進行條件拆分 日常工作常遇到的utils中積累的代碼，可以優化的地方希望多多指教！ ...
1、DataTable 轉 泛型T的List
/// <summary> /// 數據集DataTable轉換成List集合 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="dtTemp"></param> /// <returns></returns> public static List<T> ToListByDataTable<T>(DataTable dtTemp) { if (dtTemp == null || dtTemp.Rows.Count == 0) { return null; } List<T> lstResult = new List<T>(); for (int j = 0, l = dtTemp.Rows.Count; j < l; j++) { T _t = (T)Activator.CreateInstance(typeof(T)); PropertyInfo[] propertys = _t.GetType().GetProperties(); foreach (PropertyInfo pi in propertys) { for (int i = 0, k = dtTemp.Columns.Count; i < k; i++) { // 屬性與欄位名稱一致的進行賦值 if (pi.Name.ToLower().Equals(dtTemp.Columns[i].ColumnName.ToLower())) { if (dtTemp.Rows[j][i] != DBNull.Value) { switch (pi.PropertyType.ToString()) { case "System.Int32": pi.SetValue(_t, Nall.ToInt(dtTemp.Rows[j][i].ToString()), null); break; case "System.Int64": pi.SetValue(_t, Nall.ToLong(dtTemp.Rows[j][i].ToString()), null); break; case "System.DateTime": pi.SetValue(_t, Nall.ToDateTime(dtTemp.Rows[j][i].ToString()), null); break; case "System.String": pi.SetValue(_t, dtTemp.Rows[j][i].ToString(), null); break; case "System.Boolean": pi.SetValue(_t, Nall.ToBoolean(dtTemp.Rows[j][i].ToString()), null); break; case "System.Guid": pi.SetValue(_t, Nall.ToGuid(dtTemp.Rows[j][i].ToString()), null); break; case "System.Single": pi.SetValue(_t, Convert.ToSingle(dtTemp.Rows[j][i].ToString()), null); break; case "System.Double": pi.SetValue(_t, Convert.ToDouble(dtTemp.Rows[j][i].ToString()), null); break; case "System.Object": pi.SetValue(_t, dtTemp.Rows[j][i], null); break; } } else { switch (pi.PropertyType.ToString()) { case "System.Int32": pi.SetValue(_t, -1, null); break; case "System.Int64": pi.SetValue(_t, -1, null); break; case "System.DateTime": pi.SetValue(_t, new DateTime(0x76c, 1, 1), null); break; case "System.Boolean": pi.SetValue(_t, false, null); break; case "System.Guid": pi.SetValue(_t, Guid.Empty, null); break; case "System.Single": pi.SetValue(_t, 0.0f, null); break; case "System.Double": pi.SetValue(_t, 0.0, null); break; case "System.String": pi.SetValue(_t, string.Empty, null); break; default: pi.SetValue(_t, null, null); break; } } break; } } } lstResult.Add(_t); } return lstResult; }
2、DataTable 轉 HashTable
/// <summary> /// DataTable轉HashTable /// </summary> /// <param name="dt"></param> /// <param name="key"></param> /// <returns></returns> public static Hashtable ToHashtableByDataRow(DataTable dt, int key) { Hashtable ht = new Hashtable(); for (int i = 0; i < dt.Columns.Count; i++) { ht.Add(dt.Columns[i].ColumnName, dt.Rows[key][i]); } return ht; }
3、DataTable 轉 HashTable
/// <summary> /// 轉換哈希表 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="dt"></param> /// <returns></returns> public static List<Hashtable> ToHashtableByDataTable<T>(DataTable dt) { List<Hashtable> listht = new List<Hashtable>(); for (int i = 0; i < dt.Rows.Count; i++) { Hashtable ht = new Hashtable(); ht.Add(i, dt.Rows[i]); listht.Add(ht); } return listht; }
4、DataTable 按照某列進行條件拆分
/// <summary> /// 拆分Dt，返回相同數據結構的多個Dt /// [Excel需要去掉第一行標題] /// </summary> /// <param name="dt">原始數據Dt</param> /// <param name="condition">第幾列數據，按照這一列進行拆分</param> /// <param name="orderstr">排序條件，DataView的排序條件</param> /// <returns></returns> public static List<DataTable> SplitDtSameStruct(DataTable dt,int columnnum,string orderstr) { //定義返回對象 List<DataTable> listDt = new List<DataTable>(); //按照條件進行篩選 List<string> conditionstr = new List<string>(); foreach (DataRow dr in dt.Rows) { //篩選欄位的值 string key = dr["Column"+ columnnum].ToString(); //不存在新增進條件conditionstr中 if (!isExit(conditionstr,key)) { conditionstr.Add(key); } } //根據條件conditionstr集合進行拆分dt //1、將dt數據源按照欄位排序 dt.Columns.Add(); DataView view = new DataView(dt); //正序排列 view.Sort = orderstr;//"Column"+ columnnum + " ASC"; dt = view.ToTable(); foreach (string str in conditionstr) { //按照條件進行抽取數據 DataRow[] dr = dt.Select("Column"+ columnnum + "='"+str+"'"); //抽出的數據存入臨時的tempdt中 DataTable tempdt = new DataTable(); tempdt = dt.Clone();//拷貝框架 for (int i = 0; i < dr.Length; i++) { tempdt.ImportRow((DataRow)dr[i]); } //tempdt存入返回對象listDt中 listDt.Add(tempdt); } return listDt; }
日常工作常遇到的utils中積累的代碼，可以優化的地方希望多多指教！
