/**//// <summary>
/// 得到一年中的某周的起始日和截止日
/// 年 nYear
/// 周数 nNumWeek
/// 周始 out dtWeekStart
/// 周终 out dtWeekeEnd
/// </summary>
/// <param name="nYear"></param>
/// <param name="nNumWeek"></param>
/// <param name="dtWeekStart"></param>
/// <param name="dtWeekeEnd"></param>
public static void GetWeek(int nYear, int nNumWeek, out DateTime dtWeekStart, out DateTime dtWeekeEnd)
{
DateTime dt = new DateTime(nYear, 1, 1);
dt = dt + new TimeSpan((nNumWeek - 1) * 7, 0, 0, 0);
dtWeekStart = dt.AddDays(-(int)dt.DayOfWeek + (int)DayOfWeek.Monday);
dtWeekeEnd = dt.AddDays((int)DayOfWeek.Saturday - (int)dt.DayOfWeek + 1);
}
/**//// <summary>
/// 求当前日期是一年的中第几周
/// </summary>
/// <param name="date"></param>
/// <returns></returns>
public static int WeekOfYear(DateTime curDay)
{
int firstdayofweek = Convert.ToInt32(Convert.ToDateTime(curDay.Year.ToString() + "- " + "1-1 ").DayOfWeek); int days = curDay.DayOfYear;
int daysOutOneWeek = days - (7 - firstdayofweek); if (daysOutOneWeek <= 0)
{
return 1;
}
else
{
int weeks = daysOutOneWeek / 7;
if (daysOutOneWeek % 7 != 0)
weeks++; return weeks + 1; } }
我把上面的代码放进一个sqlhelper.cs文件里,现在要在后台调用,怎么调用?1、如已知周数,求起始日和截止日
string week="25";//已知当前是第25周2、已日期,求是当年中的第几周
string date="2013-07-03"//已知当前是第25周
/// 得到一年中的某周的起始日和截止日
/// 年 nYear
/// 周数 nNumWeek
/// 周始 out dtWeekStart
/// 周终 out dtWeekeEnd
/// </summary>
/// <param name="nYear"></param>
/// <param name="nNumWeek"></param>
/// <param name="dtWeekStart"></param>
/// <param name="dtWeekeEnd"></param>
public static void GetWeek(int nYear, int nNumWeek, out DateTime dtWeekStart, out DateTime dtWeekeEnd)
{
DateTime dt = new DateTime(nYear, 1, 1);
dt = dt + new TimeSpan((nNumWeek - 1) * 7, 0, 0, 0);
dtWeekStart = dt.AddDays(-(int)dt.DayOfWeek + (int)DayOfWeek.Monday);
dtWeekeEnd = dt.AddDays((int)DayOfWeek.Saturday - (int)dt.DayOfWeek + 1);
}
/**//// <summary>
/// 求当前日期是一年的中第几周
/// </summary>
/// <param name="date"></param>
/// <returns></returns>
public static int WeekOfYear(DateTime curDay)
{
int firstdayofweek = Convert.ToInt32(Convert.ToDateTime(curDay.Year.ToString() + "- " + "1-1 ").DayOfWeek); int days = curDay.DayOfYear;
int daysOutOneWeek = days - (7 - firstdayofweek); if (daysOutOneWeek <= 0)
{
return 1;
}
else
{
int weeks = daysOutOneWeek / 7;
if (daysOutOneWeek % 7 != 0)
weeks++; return weeks + 1; } }
我把上面的代码放进一个sqlhelper.cs文件里,现在要在后台调用,怎么调用?1、如已知周数,求起始日和截止日
string week="25";//已知当前是第25周2、已日期,求是当年中的第几周
string date="2013-07-03"//已知当前是第25周
解决方案 »
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然后 类名.WeekOfYear
或者 命名空间.类名.WeekOfYear
aa=sqlhelper.WeekOfYear(DateTime bb)
这样吗?
这个怎么搞,有两个输出的
{
int yy = 2012;
int ww = 23;
DateTime str = sqlhelper.GetWeek(yy, ww, out DateTime (dtWeekStart));
DateTime end = sqlhelper.GetWeek(yy, ww, out DateTime (dtWeekeEnd)); TextBox2.Text = str;
TextBox1.Text = end;
}怎么改,这样报错
{
int yy = 2012;
int ww = 23;
DateTime dtWeekStart;
DateTime dtWeekeEnd;
DateTime str = sqlhelper.GetWeek(yy, ww, out dtWeekStart);
DateTime end = sqlhelper.GetWeek(yy, ww, out dtWeekeEnd);
TextBox2.Text = dtWeekStart.ToString();
TextBox1.Text = dtWeekeEnd.ToString();
}
protected void Button1_Click(object sender, EventArgs e)
{
int yy = 2012;
int ww = 23;
DateTime dtWeekStart;
DateTime dtWeekeEnd;
sqlhelper.GetWeek(yy, ww, out dtWeekStart, out dtWeekeEnd);
TextBox2.Text = dtWeekStart.ToString();
TextBox1.Text = dtWeekeEnd.ToString();
}
类名.GetWeek(参数1,参数2,参数3,参数4);
string sVal = "23";
double.TryParse(sVal, out dVal);
//这里是 out 的用法,是用于输出给外面的值.我建议你还是先把最基础的知识给弄好了...怎么调用方法的不会...
你仔细看一下代码,你不是将dtWeekStart 重新赋值了么?