收集的C#常用类代码

//--方法
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.Text;
using System.Globalization;
using System.Text.RegularExpressions;
using System.IO;

/// <summary>
/// 表示Web上的通用方法,如顯示提示信息,獲取日期,錯誤日志維護等.
/// </summary>
public class WebCom
{
public WebCom()
{

}
/// <summary>
/// 顯示javascript的alert消息框,彈出消息框
/// </summary>
/// <param name="orgPage"></param>
/// <param name="strMessage"></param>
public static void ShowJsMessage(Page orgPage, string strMessage)
{
Random random = new Random();
string strKey = "__ShowMessage" + random.Next(10000).ToString() + "()";
if (orgPage.ClientScript.IsStartupScriptRegistered(strKey))
{
strKey = "__ShowMessage" + random.Next(10000).ToString() + "()";
}
string strScript = "<script language=\"JavaScript\">\n\r" +
" alert(\"" + strMessage.Replace("\r", Convert.ToString(13)).Replace("\n", Convert.ToString(10))

+ "\")\n\r" + " </script>\n\r";
Type csType = orgPage.GetType();
orgPage.ClientScript.RegisterStartupScript(csType, strKey, strScript);
}
/// <summary>
/// 顯示javascript的消息框,彈出消息框
/// </summary>
/// <param name="orgPage"></param>
/// <param name="errorMessage"></param>
/// <param name="messHeight"></param>
/// <param name="messWidth"></param>
public static void ShowJsMessage(Page orgPage, string errorMessage, int messHeight, int messWidth)
{
Random random = new Random();
string strKey = "__ShowErrorMessage" + random.Next(10000).ToString() + "()";
if (orgPage.ClientScript.IsStartupScriptRegistered(strKey))
{
strKey = "__ShowErrorMessage" + random.Next(10000).ToString() + "()";
}
string strScript = "<script language=\"JavaScript\">\n\r" +
" $(document).ready(ShowErrorMessage);\n\r" +
" function ShowErrorMessage() " +
" {\n\r" +
" ShowMessageBox(\"" + errorMessage.Replace("\r", Convert.ToString(13)).Replace("\n", Convert.ToString(10))

+ "\"," + messWidth + "," + messHeight + ")\n\r" + "} \n\r</script>\n\r";
Type csType = orgPage.GetType();
orgPage.ClientScript.RegisterStartupScript(csType, strKey, strScript);

}
/// <summary>
/// 給出系統提示信息
/// </summary>
/// <param name="vErrorMessage"></param>
/// <returns></returns>
public static string ShowSystemTip(string vErrorMessage)
{
StringBuilder ErrorMessage = new StringBuilder();
ErrorMessage.Length = 0;
ErrorMessage.Append("<div style=\"padding:20px;width:200px;height:150px\"><div class=\"x-box-blue\"><div class=\"x-box-tl\"><div class=\"x-box-tr\"><div class=\"x-box-tc\"></div></div></div>");
ErrorMessage.Append("<div class=\"x-box-ml\"><div class=\"x-box-mr\"><div class=\"x-box-mc\">");
ErrorMessage.Append("<h3>System Message</h3><div style='height:100px;text-align:center;vertical-align: middle;line-height:40px'><font color=#FF0000 size=4 nowrap>" + vErrorMessage + "</font></div>");
ErrorMessage.Append(" </div></div></div>");
ErrorMessage.Append(" <div class=\"x-box-bl\"><div class=\"x-box-br\">");
ErrorMessage.Append(" <div class=\"x-box-bc\"></div></div></div>");
ErrorMessage.Append(" </div></div>");
return ErrorMessage.ToString();
}
/// <summary>
/// 給出系統提示信息,並指定信息的接受者
/// </summary>
/// <param name="vTip"></param>
/// <param name="vHeight"></param>
/// <param name="vWidth"></param>
/// <returns></returns>
public static string ShowSystemTip(string vTip, int vHeight, int vWidth)
{
StringBuilder ErrorMessage = new StringBuilder();
ErrorMessage.Length = 0;
ErrorMessage.Append(" <div style='padding:20px;'><div style='width:" + vWidth + "px;' class='main-div' > <div class='main-top-left'> <div class='main-top-right'><div class='main-top-header'>系統提示信息</div></div></div>");
ErrorMessage.Append(" <div class='main-middle-left'><div class='main-middle-right'><div class='main-content-border'><div class='main-content' style='height:" + vHeight + "px;padding:5px;font-size:11pt;color:red'>");
ErrorMessage.Append(vTip);
ErrorMessage.Append("</div></div></div></div><div class='main-bottom-left'> <div class='main-bottom-right'><div class='main-bottom-middle'></div></div></div></div></div>");
return ErrorMessage.ToString();
}
/// <summary>
/// 加密字符,防止敏感信息外泄.
/// </summary>
/// <param name="s"></param>
/// <returns></returns>
public static string EncodeBase(string s)
{
string strResult = "";
if (s != "" && s != null)
{
strResult = Convert.ToBase64String(System.Text.ASCIIEncoding.Default.GetBytes(s));
}
return strResult;
}

/// <summary>
/// 解密字符,防止敏感信息外泄.
/// </summary>
/// <param name="s"></param>
/// <returns></returns>
public static string DecodeBase(string s)
{
string strResult = "";
if (s != "" && s != null)
{
strResult = System.Text.ASCIIEncoding.Default.GetString(Convert.FromBase64String(s));
}
return strResult;
}

/// <summary>
/// 根據周別來獲取本周日期的第一天
/// </summary>
/// <param name="weekID"></param>
/// <returns></returns>
public static string GetWeekFirstDay(string weekID)
{
int year = int.Parse(weekID.Substring(0, 4));
DateTime newYearDay = new DateTime(year, 1, 1);
int firstWeekFirstDay = Convert.ToInt32(newYearDay.DayOfWeek);
int days = (int)(7 - firstWeekFirstDay);
DateTime secondWeekFirstDay = newYearDay.AddDays(days);
int week = int.Parse(weekID.Substring(4, 2));
string firstDate = secondWeekFirstDay.AddDays((week - 2) * 7).ToString("yyyy-MM-dd");
return firstDate;
}

/// <summary>
/// 根據周別來獲取本周日期的最后一天
/// </summary>
/// <param name="weekID"></param>
/// <returns></returns>
public static string GetWeekLastDay(string weekID)
{
int year = int.Parse(weekID.Substring(0, 4));
DateTime newYearDay = new DateTime(year, 1, 1);
int firstweekfirstday = Convert.ToInt32(newYearDay.DayOfWeek);
int days = (int)(7 - firstweekfirstday);
DateTime secondweekfisrtday = newYearDay.AddDays(days);
int week = int.Parse(weekID.Substring(4, 2));
string lastdate = secondweekfisrtday.AddDays((week - 2) * 7 + 6).ToString("yyyy-MM-dd");
return lastdate;
}

/// <summary>
///
/// </summary>
/// <param name="weekId"></param>
/// <returns></returns>
public static string[] GetWeekRange(string weekId)
{
string[] day = new string[7];
int year = int.Parse(weekId.Substring(0, 4));
DateTime newYearDay = new DateTime(year, 1, 1);
int firstweekfirstday = Convert.ToInt32(newYearDay.DayOfWeek);
int days = (int)(7 - firstweekfirstday);
DateTime secondweekfisrtday = newYearDay.AddDays(days);
int week = int.Parse(weekId.Substring(4, 2));
DateTime firstdate = secondweekfisrtday.AddDays((week - 2) * 7);
DateTime lastdate = secondweekfisrtday.AddDays((week - 2) * 7 + 6);
day[0] = firstdate.ToString("yyyy-MM-dd");
for (int i = 1; i <= 5; i++)
{
day[i] = firstdate.AddDays(i).ToString("yyyy-MM-dd");
}
day[6] = lastdate.ToString("yyyy-MM-dd");
return day;
}

/// <summary>
/// 根據日期返回周次
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static string GetWeekOfYear(DateTime dt)
{
CultureInfo ci = CultureInfo.CurrentCulture;
System.Globalization.Calendar calendar = ci.Calendar;
CalendarWeekRule rule = ci.DateTimeFormat.CalendarWeekRule;
DayOfWeek dow = ci.DateTimeFormat.FirstDayOfWeek;
int week = calendar.GetWeekOfYear(dt, rule, dow);
string weekId = dt.Year + week.ToString("00");
return weekId;
}
/// <summary>
/// 判斷是否輸入整數數字的正則表達
/// </summary>
/// <param name="Validate"></param>
/// <returns></returns>
public static bool CheckValidate(string Validate)
{
Regex re = new Regex(@"^[0-9]+$");//正則表達式

if (!re.IsMatch(Validate))
{
return false;
}
else
{
return true;
}
}
/// <summary>
/// 產生隨機的字母
/// </summary>
/// <returns></returns>
public static string RandomnAlpha(int i)
{
string oriStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstyuwxyz";
string reStr = "";
Random rd = new Random();
for (int k = 0; k < i; k++)
{
reStr += oriStr[rd.Next(0, oriStr.Length)].ToString();
}
return reStr;
}
/// <summary>
/// 將信息寫入日志文件中
/// </summary>
/// <param name="textContent">日志內容</param>
/// <param name="Path">文件路徑</param>
public static void WriteLog(string textContent, string Path)
{
if (!File.Exists(Path))
{
using (StreamWriter writer = File.CreateText(Path))
{
writer.WriteLine(textContent + "\n");
writer.Close();
//string LOG_SOURCE = ConfigurationManager.AppSettings["Event Log Source"];
//System.Diagnostics.EventLog.WriteEntry(LOG_SOURCE, textContent, System.Diagnostics.EventLogEntryType.Error);

}
}
else
{
using (StreamWriter writer2 = File.AppendText(Path))
{
try
{
writer2.WriteLine(textContent + "\n");
writer2.Close();
}
catch
{

}
}
}
}
/// <summary>
/// 字符截取擴展
/// <para></para>
/// <para> 解決C# 採用 Unicode 16（UCS2）編碼,對於漢字不能處理.</para>
///
/// </summary>
/// <param name="oriString"></param>
/// <param name="length"></param>
/// <returns></returns>
public static string SubStr(string oriString, int length)
{
byte[] bytes = System.Text.Encoding.Unicode.GetBytes(oriString);
int n = 0;
int i = 0;
for (; i < bytes.GetLength(0) && n < length; i++)
{
if (i % 2 == 0)
{
n++;
}
else
{
if (bytes[i] > 0)
{
n++;
}
}
}
if (i % 2 == 1)
{
if (bytes[i] > 0)

i = i - 1;
else
i = i + 1;
}
return System.Text.Encoding.Unicode.GetString(bytes, 0, i);

}

}