using System.Data; using System.Reflection; using System.Collections; using System.Collections.Generic; using System; namespace BI.ERP.DAL
{
public class DataSet转换List
{
/// <summary> /// 泛型集合与DataSet互相转换 /// </summary> public class IListDataSet
{
/// <summary> /// 集合装换DataSet /// </summary> /// <param name="list">集合</param> /// <returns></returns> /// 2008-08-01 22:08 HPDV2806 public static DataSet ToDataSet(IList p_List)
{ DataSet result = new DataSet(); DataTable _DataTable = new DataTable(); if (p_List.Count > )
{ PropertyInfo[] propertys = p_List[].GetType().GetProperties(); foreach (PropertyInfo pi in propertys)
{ _DataTable.Columns.Add(pi.Name, pi.PropertyType); } for (int i = ; i < p_List.Count; i++)
{ ArrayList tempList = new ArrayList(); foreach (PropertyInfo pi in propertys)
{ object obj = pi.GetValue(p_List[i], null); tempList.Add(obj); } object[] array = tempList.ToArray(); _DataTable.LoadDataRow(array, true); } } result.Tables.Add(_DataTable); return result; } /// <summary> /// 泛型集合转换DataSet /// </summary> /// <typeparam name="T"></typeparam> /// <param name="list">泛型集合</param> /// <returns></returns> /// 2008-08-01 22:43 HPDV2806 public static DataSet ToDataSet<T>(IList<T> list)
{ return ToDataSet<T>(list, null); } /// <summary> /// 泛型集合转换DataSet /// </summary> /// <typeparam name="T"></typeparam> /// <param name="p_List">泛型集合</param> /// <param name="p_PropertyName">待转换属性名数组</param> /// <returns></returns> /// 2008-08-01 22:44 HPDV2806 public static DataSet ToDataSet<T>(IList<T> p_List, params string[] p_PropertyName)
{ List<string> propertyNameList = new List<string>(); if (p_PropertyName != null) propertyNameList.AddRange(p_PropertyName); DataSet result = new DataSet(); DataTable _DataTable = new DataTable(); if (p_List.Count > )
{ PropertyInfo[] propertys = p_List[].GetType().GetProperties(); foreach (PropertyInfo pi in propertys)
{ if (propertyNameList.Count == )
{ // 没有指定属性的情况下全部属性都要转换 _DataTable.Columns.Add(pi.Name, pi.PropertyType); } else
{ if (propertyNameList.Contains(pi.Name)) _DataTable.Columns.Add(pi.Name, pi.PropertyType); } } for (int i = ; i < p_List.Count; i++)
{ ArrayList tempList = new ArrayList(); foreach (PropertyInfo pi in propertys)
{ if (propertyNameList.Count == )
{ object obj = pi.GetValue(p_List[i], null); tempList.Add(obj); } else
{ if (propertyNameList.Contains(pi.Name))
{ object obj = pi.GetValue(p_List[i], null); tempList.Add(obj); } } } object[] array = tempList.ToArray(); _DataTable.LoadDataRow(array, true); } } result.Tables.Add(_DataTable); return result; } /// <summary> /// DataSet装换为泛型集合 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="p_DataSet">DataSet</param> /// <param name="p_TableIndex">待转换数据表索引</param> /// <returns></returns> /// 2008-08-01 22:46 HPDV2806 public static IList<T> DataSetToIList<T>(DataSet p_DataSet, int p_TableIndex)
{ if (p_DataSet == null || p_DataSet.Tables.Count < ) return null; if (p_TableIndex > p_DataSet.Tables.Count - ) return null; if (p_TableIndex < ) p_TableIndex = ; DataTable p_Data = p_DataSet.Tables[p_TableIndex]; // 返回值初始化 IList<T> result = new List<T>(); for (int j = ; j < p_Data.Rows.Count; j++)
{ T _t = (T)Activator.CreateInstance(typeof(T)); PropertyInfo[] propertys = _t.GetType().GetProperties(); foreach (PropertyInfo pi in propertys)
{ for (int i = ; i < p_Data.Columns.Count; i++)
{ // 属性与字段名称一致的进行赋值 if (pi.Name.Equals(p_Data.Columns[i].ColumnName))
{ // 数据库NULL值单独处理 if (p_Data.Rows[j][i] != DBNull.Value) pi.SetValue(_t, p_Data.Rows[j][i], null); else pi.SetValue(_t, null, null); break; } } } result.Add(_t); } return result; } /// <summary> /// DataSet装换为泛型集合 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="p_DataSet">DataSet</param> /// <param name="p_TableName">待转换数据表名称</param> /// <returns></returns> /// 2008-08-01 22:47 HPDV2806 public static IList<T> DataSetToIList<T>(DataSet p_DataSet, string p_TableName)
{ int _TableIndex = ; if (p_DataSet == null || p_DataSet.Tables.Count < ) return null; if (string.IsNullOrEmpty(p_TableName)) return null; for (int i = ; i < p_DataSet.Tables.Count; i++)
{ // 获取Table名称在Tables集合中的索引值 if (p_DataSet.Tables[i].TableName.Equals(p_TableName))
{ _TableIndex = i; break; } } return DataSetToIList<T>(p_DataSet, _TableIndex); } // <summary> /// DataTable装换为泛型集合 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="p_DataTable">p_DataTable</param> /// <returns></returns> /// 2008-08-01 22:47 HPDV2806
public static IList<T> DataTableToIList<T>(DataTable p_DataTable)
{ if (p_DataTable == null || p_DataTable.Rows.Count < ) return null; //DataTable p_Data = p_DataSet.Tables[p_TableIndex]; // 返回值初始化 IList<T> result = new List<T>(); for (int j = ; j < p_DataTable.Rows.Count; j++)
{ T _t = (T)Activator.CreateInstance(typeof(T)); PropertyInfo[] propertys = _t.GetType().GetProperties(); foreach (PropertyInfo pi in propertys)
{ for (int i = ; i < p_DataTable.Columns.Count; i++)
{ // 属性与字段名称一致的进行赋值 if (pi.Name.Equals(p_DataTable.Columns[i].ColumnName))
{ // 数据库NULL值单独处理 if (p_DataTable.Rows[j][i] != DBNull.Value) pi.SetValue(_t, p_DataTable.Rows[j][i], null); else pi.SetValue(_t, null, null); break; } } } result.Add(_t); } return result; } }
}
}
调用方法
#region
List<Customer_model> CMList = DataSet转换List.IListDataSet.DataTableToIList<Customer_model>(da) as List<Customer_model>;
#endregion