如果按小时的数据组为空，如何替换零？

问题描述

我将数据分组为数小时，

I am grouping my data into hours,

public List<Emails> valuefunc()
   {
       List<Emails> o = new List<Emails>();

       var res = from p in email
                 where p.CurrentStatus=="Completed"
                 group p by new { weekday = p.SubmitDate.Value.DayOfWeek,Hour=p.SubmitDate.Value.Hour } into GRP
                 orderby  GRP.Key.weekday
                 select new  Emails
                 {
                   label= GRP.Key.weekday.ToString() ,
                   label2 = " H " +GRP.Key.Hour ,
                   Values=GRP.Count()
                 };


       o.AddRange(res);
       return o;

   }

输出：

output:

label   Hour    Values 
Sunday   H 0       2 
Sunday  H 1       4 
Sunday  H 3       1 
Sunday  H 6       4 
Sunday  H 7      16 
Sunday  H 9      25 
Sunday  H 20     2 
Sunday  H 22     5 
Monday  H 1      7 
Monday  H 2      3 
Monday  H 6      2 

但我的问题是，如果特定小时值为null，我们怎么能得到零计数的那个小时。就像这里H2是null所以它不显示我怎么能得到零，如果为零，则为零。

but my question is if specific hour the value is null how can we get that hour with zero count. like here H2 is null so it does not display how can i get H2 with zero count if null.

推荐答案

//created in LinqPad 4.51.03(AnyCPU)
void Main()
{
	List<email> emails = new List<email>{
		new email(new DateTime(2014,12,14,7,0,0), "Completed"),
		new email(new DateTime(2014,12,14,7,15,0), "Completed"),
		new email(new DateTime(2014,12,14,7,30,0), "Completed"),
		new email(new DateTime(2014,12,14,8,5,0), "Incomplete"),
		new email(new DateTime(2014,12,14,9,12,0), "Completed"),
		new email(new DateTime(2014,12,14,9,52,0), "Completed"),
		new email(new DateTime(2014,12,14,10,20,0), "Incomplete"),
		new email(new DateTime(2014,12,14,11,28,0), "Completed"),
		new email(new DateTime(2014,12,14,12,36,0), "Incomplete"),
		new email(new DateTime(2014,12,14,13,44,0), "Completed"),
		new email(new DateTime(2014,12,14,13,49,0), "Completed"),
		new email(new DateTime(2014,12,14,13,54,0), "Completed"),
		new email(new DateTime(2014,12,14,14,52,0), "Incomplete"),
		new email(new DateTime(2014,12,14,15,8,0), "Completed"),
		new email(new DateTime(2014,12,14,15,15,0), "Incomplete")
		};
		
	//start date
	DateTime startDate = new DateTime(2014,12,14,6,0,0);
	//end date
	DateTime endDate = new DateTime(2014,12,14,16,0,0);
	int hdiff = ((TimeSpan) (endDate-startDate)).Hours; 
	hdiff++;
	//define Hours; fill
	List<datetime> hours = new List<datetime>();
	for(int i=0; i<hdiff;>	{
		hours.Add(startDate.AddHours(i));
	}
		
	var qry = from hr in hours
		select new{
				Date = hr.ToString("yyyy-MM-dd HH"),
				Count = (emails.Count(e=>e.SubmitDate.ToString("yyyy-MM-dd HH")==hr.ToString("yyyy-MM-dd HH") && e.CurrentStatus=="Completed"))
			};
	
	qry.Dump();
}

// Define other methods and classes here
class email
{
	private DateTime aSubmitDate;
	private string aStatus = "Incomplete";

	public email(DateTime _SubmitDate, string _Status)
	{
		aSubmitDate = _SubmitDate;
		aStatus = _Status;
	}
	
	public DateTime SubmitDate
	{
		get{return aSubmitDate;}
		set{aSubmitDate = value;}
	}
	
	public string CurrentStatus
	{
		get{return aStatus;}
		set{aStatus = value;}
	}
}</datetime></datetime></email></email>

结果：

Result:

Date             Count
2014-12-14 06    0 
2014-12-14 07    3 
2014-12-14 08    0 
2014-12-14 09    2 
2014-12-14 10    0 
2014-12-14 11    1 
2014-12-14 12    0 
2014-12-14 13    3 
2014-12-14 14    0 
2014-12-14 15    1 
2014-12-14 16    0

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