c#[ASP.NET]泛型集合与DataSet互相转换

来源：互联网发布：win10 美化仿mac 编辑：程序博客网时间：2024/06/08 07:29
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Collections;
using System.Collections.Generic;
using System.Reflection;
/// <summary> /// 泛型集合与DataSet互相转换 /// </summary> public class IListDataSet{    #region list转换为DataSet     // 集合装换DataSet     public static DataSet ToDataSet(IList p_List)    {        DataSet result = new DataSet();        DataTable _DataTable = new DataTable();        if (p_List.Count > 0)        {            PropertyInfo[] propertys = p_List[0].GetType().GetProperties();            foreach (PropertyInfo pi in propertys)            {                _DataTable.Columns.Add(pi.Name, pi.PropertyType);            }            for (int i = 0; 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;    }    // 泛型集合转换DataSet     public static DataSet ToDataSet<T>(IList<T> list)    {        return ToDataSet<T>(list, null);    }    // 泛型集合转换DataSet     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 > 0)        {            PropertyInfo[] propertys = p_List[0].GetType().GetProperties();            foreach (PropertyInfo pi in propertys)            {                if (propertyNameList.Count == 0)                {                    // 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 = 0; i < p_List.Count; i++)            {                ArrayList tempList = new ArrayList();                foreach (PropertyInfo pi in propertys)                {                    if (propertyNameList.Count == 0)                    {                        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;    }    #endregion    #region DataSet转换为List        // DataSet装换为泛型集合     public static List<T> DataSetToIList<T>(DataSet p_DataSet, int p_TableIndex)    {        if (p_DataSet == null || p_DataSet.Tables.Count < 0)            return null;        if (p_TableIndex > p_DataSet.Tables.Count - 1)            return null;        if (p_TableIndex < 0)            p_TableIndex = 0;        DataTable p_Data = p_DataSet.Tables[p_TableIndex];        // 返回值初始化         List<T> result = new List<T>();        for (int j = 0; 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 = 0; 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))                    {                      //  DataRowCollection dataRowCollection = new DataRowCollection();                        //dataRowCollection.Add(                         // p_Data.Columns[i].DataType = pi.GetType();                                                    // 数据库NULL值单独处理                         if (p_Data.Rows[j][i] != DBNull.Value)                        {                            try { pi.SetValue(_t, p_Data.Rows[j][i], null); }                            catch { pi.SetValue(_t,int.Parse(p_Data.Rows[j][i].ToString()), null); }                        }                        else                            pi.SetValue(_t, null, null);                        break;                    }                }            }            result.Add(_t);        }        return result;    }    // DataSet装换为泛型集合     public static List<T> DataSetToIList<T>(DataSet p_DataSet, string p_TableName)    {        int _TableIndex = 0;        if (p_DataSet == null || p_DataSet.Tables.Count < 0)            return null;        if (string.IsNullOrEmpty(p_TableName))            return null;        for (int i = 0; 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);    }    #endregion}
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