DataTable操作工具类DataTableHelper

DataTable操作工具类DataTableHelper。

功能介绍：

• 将泛型集合填充为数据表
• 将泛型填充为数据表
• 将对象集合填充为数据表
• 将对象填充为数据表
• 将定IDictionary数据转换为DataSet数据
• 将数据表填充为泛型集合
• 将数据表填充为泛型集合

  using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Web;
  using System.Reflection;
  using System.Data;
  using System.Collections;
  
  namespace IM.Common
  {
      /// <summary>
      /// 数据操作
      /// <para>创建作者：changjin</para>
      /// <para>创建日期：2011/07/26</para>
      /// </summary>
      public class DataHelper
      {
          /// <summary>
          /// 将泛型集合填充为数据表
          /// <para>创建作者：changjin</para>
          /// <para>创建日期：2011/07/26</para>
          /// </summary>
          /// <param name="list">泛型集合</param>
          /// <param name="tableName">表名</param>
          /// <returns>数据表</returns>
          public static DataTable Fill<T>(IList<T> list, string tableName)
          {
              DataTable dt = new DataTable(tableName);
              T t = Activator.CreateInstance<T>();
              Type type = t.GetType();
              PropertyInfo[] properties = type.GetProperties().Where(p => p.MemberType == MemberTypes.Property && p.CanRead).ToArray();
              foreach (PropertyInfo p in properties)
              {
                  dt.Columns.Add(p.Name);
              }
              foreach (T t1 in list)
              {
                  PropertyInfo[] properties1 = t1.GetType().GetProperties().Where(p => p.MemberType == MemberTypes.Property && p.CanRead).ToArray();
                  DataRow dr = dt.NewRow();
                  for (int i = 0; i < dt.Columns.Count; i++)
                  {
                      PropertyInfo propertyInfo = properties1.SingleOrDefault(p => p.Name == Convert.ToString(dt.Columns[i].ColumnName));
                      if (propertyInfo != null)
                      {
                          dr[dt.Columns[i].ColumnName] = propertyInfo.GetValue(t1, null);
                      }
                  }
                  dt.Rows.Add(dr);
              }
              return dt;
          }
  
          /// <summary>
          /// 将泛型填充为数据表
          /// <para>创建作者：changjin</para>
          /// <para>创建日期：2011/07/26</para>
          /// </summary>
          /// <param name="t">泛型</param>
          /// <param name="tableName">表名</param>
          /// <returns>数据表</returns>
          public static DataTable Fill<T>(T t, string tableName)
          {
              IList<T> list = new List<T>();
              if (t != null)
              {
                  list.Add(t);
              }
              return Fill<T>(list, tableName);
          }
  
          /// <summary>
          /// 将对象集合填充为数据表
          /// <para>创建作者：changjin</para>
          /// <para>创建日期：2011/07/26</para>
          /// </summary>
          /// <param name="list">对象集合</param>
          /// <param name="tableName">表名</param>
          /// <returns>数据表</returns>
          public static DataTable Fill(IList list, string tableName)
          {
              DataTable dt = new DataTable(tableName);
              if (list.Count > 0)
              {
                  PropertyInfo[] properties = list[0].GetType().GetProperties().Where(p => p.MemberType == MemberTypes.Property && p.CanRead).ToArray();
                  foreach (PropertyInfo p in properties)
                  {
                      dt.Columns.Add(p.Name);
                  }
                  foreach (var t in list)
                  {
                      PropertyInfo[] properties1 = t.GetType().GetProperties().Where(p => p.MemberType == MemberTypes.Property && p.CanRead).ToArray();
                      DataRow dr = dt.NewRow();
                      for (int i = 0; i < dt.Columns.Count; i++)
                      {
                          PropertyInfo propertyInfo = properties1.SingleOrDefault(p => p.Name == Convert.ToString(dt.Columns[i].ColumnName));
                          if (propertyInfo != null)
                          {
                              dr[dt.Columns[i].ColumnName] = propertyInfo.GetValue(t, null);
                          }
                      }
                      dt.Rows.Add(dr);
                  }
              }
              return dt;
          }
  
          /// <summary>
          /// 将对象填充为数据表
          /// <para>创建作者：changjin</para>
          /// <para>创建日期：2011/07/26</para>
          /// </summary>
          /// <param name="obj">对象</param>
          /// <param name="tableName">表名</param>
          /// <returns>数据表</returns>
          public static DataTable Fill(Object obj, string tableName)
          {
              IList list = null;
              if (typeof(IEnumerable).IsAssignableFrom(obj.GetType()))
              {
                  list = (IList)obj;
              }
              else
              {
                  list = new ArrayList();
                  if (obj != null)
                  {
                      list.Add(obj);
                  }
              }
              return Fill(list, tableName);
          }
  
          /// <summary>
          /// 将定IDictionary数据转换为DataSet数据
          /// <para>创建作者：changjin</para>
          /// <para>创建日期：2011/07/26</para>
          /// </summary>
          /// <param name="dictionary">键值对数据:key表名,value实体(或实体集合)</param>
          /// <returns>DataSet数据集</returns>
          public static DataSet Fill(IDictionary dictionary)
          {
              DataSet ds = new DataSet();
              foreach (DictionaryEntry de in dictionary)
              {
                  DataTable dt = Fill(de.Value, de.Key.ToString());
                  ds.Tables.Add(dt);
              }
              return ds;
          }
  
          /// <summary>
          /// 将数据表填充为泛型集合
          /// <para>创建作者：changjin</para>
          /// <para>创建日期：2011/07/26</para>
          /// </summary>
          /// <param name="dataTable">数据表</param>
          /// <returns>泛型集合</returns>
          public static IList<T> FillList<T>(DataTable dataTable)
          {
              IList<T> list = list = new List<T>();
              if (dataTable != null && dataTable.Rows.Count > 0 && dataTable.Columns.Count > 0)
              {
                  List<string> columnNameList = new List<string>();
                  for (int i = 0; i < dataTable.Columns.Count; i++)
                  {
                      columnNameList.Add(dataTable.Columns[i].ColumnName);
                  }
                  for (int i = 0; i < dataTable.Rows.Count; i++)
                  {
                      DataRow dr = dataTable.Rows[i];
                      T t = Activator.CreateInstance<T>();
                      Type type = t.GetType();
                      PropertyInfo[] properties = type.GetProperties().Where(p => p.MemberType == MemberTypes.Property && p.CanWrite).ToArray();
                      foreach (PropertyInfo p in properties)
                      {
                          if (columnNameList.Contains(p.Name) && dr[p.Name] != DBNull.Value)
                          {
                              if (p.PropertyType.IsGenericType)
                              {
                                  p.SetValue(t, Convert.ChangeType(dr[p.Name], p.PropertyType.GetGenericArguments()[0]), null);
                              }
                              else
                              {
                                  p.SetValue(t, Convert.ChangeType(dr[p.Name], p.PropertyType), null);
                              }
                          }
                      }
                      list.Add(t);
                  }
              }
              return list;
          }
  
          /// <summary>
          /// 将数据表填充为泛型集合
          /// <para>创建作者：changjin</para>
          /// <para>创建日期：2011/07/26</para>
          /// </summary>
          /// <param name="dataTable">数据表</param>
          /// <returns>泛型集合</returns>
          public static T Fill<T>(DataTable dataTable)
          {
              return FillList<T>(dataTable)[0];
          }
      }
  }