有没有人知道将行注入Silverlight DataGrid的方法?我需要一种方法来在每6个条目后添加总计行。总计适用于汇总行上方的所有行,而不仅仅是前六行。
我尝试过分组,但只显示该组的总计,并显示实际行上方的总计行数。如果可能的话,我更愿意使用DataGrid,但欢迎所有解决方案。
答案 0 :(得分:1)
好的,我有一个解决方案给你;然而,它包含一些时髦的数学功夫,所以我不确定它是否是最好的解决方案。但它确实适用于DataGrid。
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
是一个ObservableCollection,Info
只是我创建的测试类。我对代码进行了彻底的评论。它比您的要求更通用,因为您可以将numRowsToSum
更改为任何值,它应该仍然有用。