列出本月所有星期天的日期

本作业题是列出本月所有星期天的日期。

     
  public IEnumerable<DateTime> AllSundaysInMonth( 
  int year,  
  int month) 
  
    { 
  
       System.Globalization.CultureInfo ci =  
  new System.Globalization.CultureInfo( 
  " 
  en-US 
  "); 
  
         
  
         
  int days = ci.Calendar.GetDaysInMonth(year, month); 
  

         
  for ( 
  int i =  
  1; i <= days; i++) 
  
        { 
  
           
  if ( 
  new DateTime(year, month, i).DayOfWeek == DayOfWeek.Sunday)             
  
             
  yield  
  return  
  new DateTime(year, month, i); 
  
        } 
  
    }