第一種： 

復制代碼代碼如下:

string[] Day = new string[] { "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" }; 
string week = Day[Convert.ToInt32(DateTime.Now.DayOfWeek.ToString("d"))].ToString(); 
lbDay.Text = week; 

第二種： 

復制代碼代碼如下:

lbDay.Text = System.Globalization.CultureInfo.CurrentCulture.DateTimeFormat.GetDayName(DateTime.Now.DayOfWeek); 

第三種： 

復制代碼代碼如下:

public static string dt; 
public static string week; 
dt = DateTime.Today.DayOfWeek.ToString(); 
switch (dt) 
{ 
case "Monday": 
week = "星期一"; 
break; 
case "Tuesday": 
week = "星期二"; 
break; 
case "Wednesday": 
week = "星期三"; 
break; 
case "Thursday": 
week = "星期四"; 
break; 
case "Friday": 
week = "星期五"; 
break; 
case "Saturday": 
week = "星期六"; 
break; 
case "Sunday": 
week = "星期日"; 
break; 
} 
lbDay.Text = week;