有什么方法可以加快c＃中的for循环吗？

Question

I have a situation like

for(int count = 0; count <= GetNumberOfRecordsFromFile(path) ; count++)
{
    //do stuff with count                    
}

In this loop GetNumberOfRecordsFromFile(path) method returns the number of records present in the file in hundreds of thousands or more.The issue is that when the for loop is running to do calculation with count , it is slowing down but works fine..I also tried using of ParallelFor loop but it creates problem in calculation...Is there any equivalent way to run the for loop to be faster...?

Answer 1

You can simply calculate it once, store in variable and reuse:

int numberOfRecords = GetNumberOfRecordsFromFile(path);
for(int count = 0; count <= numberOfRecords; count++)
{
    //do stuff with count                    
}

Now, there is definitely no way to "speed up" this loop. It is as simple as possible.