系统常用工具函数类:日期转换、DataTable,DataReader

using System;
using System.Data;
using System.Data.SqlClient;
using System.Collections;
using System.IO;
using System.Diagnostics;

namespace Components
{
 /// <summary>
 /// 系统常用工具函数类
 /// </summary>
 public class SystemTools
 {  
  /// <summary>
  /// 将DataReader 转为 DataTable
  /// </summary>
  /// <param name="DataReader">DataReader</param>
  public static DataTable ConvertDataReaderToDataTable(SqlDataReader dataReader)
  {
   DataTable datatable = new DataTable();
   DataTable schemaTable = dataReader.GetSchemaTable();
   //动态添加列
   try
   {
   
    foreach(DataRow myRow in schemaTable.Rows)
    {
     DataColumn myDataColumn = new DataColumn();
     myDataColumn.DataType = myRow.GetType();
     myDataColumn.ColumnName = myRow[0].ToString();
     datatable.Columns.Add(myDataColumn);
    }
    //添加数据
    while(dataReader.Read())
    {
     DataRow myDataRow = datatable.NewRow();
     for(int i=0;i<schemaTable.Rows.Count;i++)
     {
      myDataRow[i] = dataReader[i].ToString();
     }
     datatable.Rows.Add(myDataRow);
     myDataRow = null;
    }
    schemaTable = null;
    dataReader.Close();
    return datatable;
   }
   catch(Exception ex)
   {
    ///抛出类型转换错误
    throw new Exception("转换出错出错!",ex);
   }
   
  }

  /// <summary>
  /// 将英文的星期几转为中文
  /// </summary> 
  public static string ConvertDayOfWeekToZh(System.DayOfWeek dw)
  {
   string DayOfWeekZh="";
   switch (dw.ToString ("D"))
   {
    case "0":
     DayOfWeekZh="日";
     break;
    case "1":
     DayOfWeekZh="一";
     break;
    case "2":
     DayOfWeekZh="二";
     break;
    case "3":
     DayOfWeekZh="三";
     break;
    case "4":
     DayOfWeekZh="四";
     break;
    case "5":
     DayOfWeekZh="五";
     break;
    case "6":
     DayOfWeekZh="六";
     break;
   }
   
   return DayOfWeekZh;
  }
 }

 /// <summary>
 /// 错误处理函数，用于记录错误日志
 /// </summary>
 public class SystemError
 {
  //记录错误日志位置
  private const string FILE_NAME = "c://OfficeAutolog.txt";

  /// <summary>
  /// 记录日志至文本文件
  /// </summary>
  /// <param name="message">记录的内容</param>
  public static void SystemLog(string message)
  {
//   if(File.Exists(FILE_NAME))
//   {
//    ///如果日志文件已经存在，则直接写入日志文件
//    StreamWriter sr = File.AppendText(FILE_NAME);
//    sr.WriteLine ("/n");
//    sr.WriteLine (DateTime.Now.ToString()+message);
//    sr.Close();
//   }
//   else
//   {
//    ///创建日志文件
//    StreamWriter sr = File.CreateText(FILE_NAME);
//    sr.Close();
//   }    
  }
 }

 //自定义Exception
 public class MyException:Exception
 {
  //包含系统Excepton
  public MyException(string source,string message,Exception inner):base(message,inner)
  {
   base.Source=source;
  }

  //不包含系统Exception
  public MyException(string source,string message):base(message)
  {
   base.Source=source;
  }
 }

 /// <summary>
 /// 处理网页中的HTML代码，并消除危险字符
 /// </summary>
 public class SystemHTML
 {
  private static string HTMLEncode(string fString)
  {
   if(fString!=string.Empty)
   {
    ///替换尖括号
    fString.Replace("<","&lt;");
    fString.Replace(">","&rt;");
    ///替换引号
    fString.Replace(((char)34).ToString(), "&quot;");
    fString.Replace(((char)39).ToString(), "&#39;");
    ///替换空格
    fString.Replace(((char)13).ToString(), "");
    ///替换换行符
    fString.Replace(((char)10).ToString(), "<BR> ");
   }
   return(fString);
  }
 }
}