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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Data;
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using System.Reflection;
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namespace RS.Common
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{
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/// <summary>
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/// dataSet和list转换
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/// </summary>
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public class IListDataSetHelper
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{
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/// <summary>
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/// 集合装换DataSet
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/// </summary>
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/// <param name="list">集合</param>
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/// <returns></returns>
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public static DataSet ToDataSet(IList p_List)
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{
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DataSet result = new DataSet();
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DataTable _DataTable = new DataTable();
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if (p_List.Count > 0)
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{
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PropertyInfo[] propertys = p_List[0].GetType().GetProperties();
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foreach (PropertyInfo pi in propertys)
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{
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_DataTable.Columns.Add(pi.Name, pi.PropertyType);
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}
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for (int i = 0; i < p_List.Count; i++)
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{
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ArrayList tempList = new ArrayList();
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foreach (PropertyInfo pi in propertys)
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{
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object obj = pi.GetValue(p_List[i], null);
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tempList.Add(obj);
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}
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object[] array = tempList.ToArray();
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_DataTable.LoadDataRow(array, true);
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}
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}
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result.Tables.Add(_DataTable);
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return result;
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}
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/// <summary>
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/// 泛型集合转换DataSet
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="list">泛型集合</param>
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/// <returns></returns>
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/// 2008-08-01 22:43 HPDV2806
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public static DataSet ToDataSet<T>(IList<T> list)
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{
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return ToDataSet<T>(list, null);
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}
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/// <summary>
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/// 泛型集合转换DataSet
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="p_List">泛型集合</param>
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/// <param name="p_PropertyName">待转换属性名数组</param>
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/// <returns></returns>
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/// 2008-08-01 22:44 HPDV2806
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public static DataSet ToDataSet<T>(IList<T> p_List, params string[] p_PropertyName)
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{
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List<string> propertyNameList = new List<string>();
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if (p_PropertyName != null)
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propertyNameList.AddRange(p_PropertyName);
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DataSet result = new DataSet();
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DataTable _DataTable = new DataTable();
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if (p_List.Count > 0)
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{
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PropertyInfo[] propertys = p_List[0].GetType().GetProperties();
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foreach (PropertyInfo pi in propertys)
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{
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if (propertyNameList.Count == 0)
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{
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// 没有指定属性的情况下全部属性都要转换
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_DataTable.Columns.Add(pi.Name, pi.PropertyType);
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}
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else
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{
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if (propertyNameList.Contains(pi.Name))
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_DataTable.Columns.Add(pi.Name, pi.PropertyType);
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}
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}
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for (int i = 0; i < p_List.Count; i++)
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{
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ArrayList tempList = new ArrayList();
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foreach (PropertyInfo pi in propertys)
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{
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if (propertyNameList.Count == 0)
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{
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object obj = pi.GetValue(p_List[i], null);
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tempList.Add(obj);
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}
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else
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{
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if (propertyNameList.Contains(pi.Name))
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{
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object obj = pi.GetValue(p_List[i], null);
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tempList.Add(obj);
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}
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}
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}
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object[] array = tempList.ToArray();
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_DataTable.LoadDataRow(array, true);
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}
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}
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result.Tables.Add(_DataTable);
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return result;
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}
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/// <summary>
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/// DataSet装换为泛型集合
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="p_DataSet">DataSet</param>
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/// <param name="p_TableIndex">待转换数据表索引</param>
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/// <returns></returns>
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/// 2008-08-01 22:46 HPDV2806
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public static IList<T> DataSetToIList<T>(DataSet p_DataSet, int p_TableIndex)
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{
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if (p_DataSet == null || p_DataSet.Tables.Count < 0)
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return null;
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if (p_TableIndex > p_DataSet.Tables.Count - 1)
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return null;
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if (p_TableIndex < 0)
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p_TableIndex = 0;
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DataTable p_Data = p_DataSet.Tables[p_TableIndex];
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// 返回值初始化
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IList<T> result = new List<T>();
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for (int j = 0; j < p_Data.Rows.Count; j++)
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{
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T _t = (T)Activator.CreateInstance(typeof(T));
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PropertyInfo[] propertys = _t.GetType().GetProperties();
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foreach (PropertyInfo pi in propertys)
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{
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for (int i = 0; i < p_Data.Columns.Count; i++)
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{
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// 属性与字段名称一致的进行赋值
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if (pi.Name.Equals(p_Data.Columns[i].ColumnName))
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{
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// 数据库NULL值单独处理
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if (p_Data.Rows[j][i] != DBNull.Value)
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pi.SetValue(_t, Convert.ChangeType(p_Data.Rows[j][i], pi.PropertyType), null);
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else
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pi.SetValue(_t, null, null);
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break;
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}
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}
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}
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result.Add(_t);
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}
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return result;
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}
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/// <summary>
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/// DataSet装换为泛型集合
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="p_DataSet">DataSet</param>
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/// <param name="p_TableName">待转换数据表名称</param>
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/// <returns></returns>
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/// 2008-08-01 22:47 HPDV2806
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public static IList<T> DataSetToIList<T>(DataSet p_DataSet, string p_TableName)
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{
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int _TableIndex = 0;
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if (p_DataSet == null || p_DataSet.Tables.Count < 0)
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return null;
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if (string.IsNullOrEmpty(p_TableName))
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return null;
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for (int i = 0; i < p_DataSet.Tables.Count; i++)
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{
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// 获取Table名称在Tables集合中的索引值
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if (p_DataSet.Tables[i].TableName.Equals(p_TableName))
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{
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_TableIndex = i;
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break;
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}
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}
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return DataSetToIList<T>(p_DataSet, _TableIndex);
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}
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/// <summary>
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/// 利用反射将DataTable转换为List<T>对象
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/// </summary>
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/// <param name="dt">DataTable 对象</param>
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/// <returns>List<T>集合</returns>
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public static List<T> DataTableToList<T>(DataTable dt) where T : class, new()
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{
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// 定义集合
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List<T> ts = new List<T>();
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//定义一个临时变量
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string tempName = string.Empty;
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//遍历DataTable中所有的数据行
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foreach (DataRow dr in dt.Rows)
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{
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T t = new T();
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// 获得此模型的公共属性
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PropertyInfo[] propertys = t.GetType().GetProperties();
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//遍历该对象的所有属性
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foreach (PropertyInfo pi in propertys)
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{
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tempName = pi.Name;//将属性名称赋值给临时变量
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//检查DataTable是否包含此列（列名==对象的属性名）
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if (dt.Columns.Contains(tempName))
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{
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//取值
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object value = dr[tempName];
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//如果非空，则赋给对象的属性
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if (value != DBNull.Value)
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{
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pi.SetValue(t, value, null);
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}
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}
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}
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//对象添加到泛型集合中
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ts.Add(t);
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}
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return ts;
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}
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}
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} |
