将行注入Silverlight DataGrid

Question

有谁知道将行注入Silverlight DataGrid的方法吗？我需要一种方法在每6个条目之后添加总计行。总数适用于汇总行之上的所有行，而不仅仅是前六行。

我试着做分组，但只显示该组的总数，并显示实际行上方的总计行数。如果可能，我宁愿为此使用DataGrid，但所有解决方案都是受欢迎的。

Answer 1

好的，我有一个解决方案给你;然而，它包含了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。但是，它确实可以使用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和Info仅仅是一个测试类我创建。我非常彻底地评论了代码。它比您的要求更通用，因为您可以将numRowsToSum更改为任何值，并且它仍然可以正常工作。