Entering Rows in Silverlight DataGrid
Does anyone know a way to input rows in Silverlight DataGrid? I need to add summary rows after every 6 records. The totals for all rows are above the totals row, not just the previous six.
I tried to do this with grouping, but this only shows the totals for the group and displays the totals for the group above the actual rows. I'd rather use a DataGrid for this if possible, but all solutions are welcome.
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Ok, I have a solution for you; however it contains some funky kung fu math and so I'm not sure if this is the best solution. However, it works with 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
is an ObservableCollection and Info
is just a test class that I created. I commented out the code completely. This is more general than your requirement in the sense that you can change numRowsToSum
to any value and it should still work.
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