오케이, 해결책이 있습니다. 그러나, 그것은 펑키 수학 쿵푸가 포함되어 있으므로 그것이 최선의 해결책인지 확실하지 않습니다. 그러나 DataGrid에서 작동합니다.
public void PopulateAndSum()
{
//Ugly Math Kung Fu starts here
//Get the number of rows in the collection
int rowCount = Items.Count;
//Here you specify after how many rows should the summation occur
int numRowsToSum = 6;
//Now the idea is to loop through the collection the same number of times
//As you would be inserting summation rows into the collection
//To calculate the maximum number of times you should circulate you
//divide through the number of rows and ceil the result. Make sure
//divide by a double or at least cast one of them to a double so you do
//not get integer division
for (int i = 0; i < Math.Ceiling(((double)rowCount)/numRowsToSum); i++)
{
//Now you want to calculate the position where you need to insert the the new entry
int index = 0;
//Check whether you are still in the bounds of the array or whether you have actually reached the last element
//in the array. This should always be the case if your collection contains a multiple of numRowsToSum
if (numRowsToSum + i * (numRowsToSum) <= rowCount)
{
//The index starts at numRowsToSum because you start the collection indexing at 0
//From there you jump the next index and add one to take into account that you inserted a new element
index = numRowsToSum + i*(numRowsToSum + 1);
}
else
{
//If your collection contains a number of elements that are not a precise multiple of numRowsToSum
//then you have to have a special condition where you calculate the index for the last few elements
//Here you need to jump back to the previous index and add the number of elements left in the collection
//You also have to add 1 to take into account that you are adding an extra row.
index = numRowsToSum + (i - 1) * (numRowsToSum + 1) + 1 + rowCount % numRowsToSum;
}
//Now you sum all the rows before the index
int sum = 0;
for (int j = 0; j < index; j++)
{
//If you want to add the previous totals to the sum comment the next part out
if ((j - numRowsToSum) % (numRowsToSum + 1) == 0)
continue;
sum += Items[j].Value;
}
//Now add the entry
Items.Insert(index, new Info() { Name = "Total", Value = sum });
}
}
Items
는 ObservableCollection에이고 Info
은 내가 만든 단지 테스트 클래스입니다. 나는 코드를 아주 철저히 주석 처리했다. numRowsToSum
을 임의의 값으로 변경할 수 있으며 여전히 작동해야한다는 점에서 요구 사항보다 일반적입니다.
바운드 컬렉션에 직접 추가 할 필요가없는 솔루션을 찾고 싶었지만 이와 비슷한 결과를 얻었습니다. 당신의 도움을 주셔서 감사합니다. – Stephan