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I have a generic list that is being used inside a method that's being called 4 times. This method writes a table in a PDF with the values of this generic list.
My problem is that I need to reverse this generic list inside the method, but I'm calling the method 4 times so the list is being reversed every time I call the method and I don't want that... what can I do? Is there a way to reverse the list without mutating the original?
This is inside the method:
t.List.Reverse();
foreach (string t1 in t.List)
{
//Some code
}
818
Using the reversed() method and reverse() method, we can reverse the contents of the list object in place i.e., we don't need to create a new list instead we just copy the existing elements to the original list in reverse order. This method directly modifies the original list.
In Python, there is a built-in function called reverse() that is used to revers the list. This is a simple and quick way to reverse a list that requires little memory. Syntax- list_name. reverse() Here, list_name means you have to write the name of the list which have to be reversed.
Reverse() method. To reverse the order of the elements within the specified list, we can use the List<T>. Reverse() method. List<T>.
The "easy" option would be to just iterate the list in reverse order without actually changing the list itself instead of trying to reverse it the first time and know to do nothing the other times:
foreach (string t1 in t.List.AsEnumerable().Reverse())
{
//Some code
}
By using the LINQ Reverse method instead of the List Reverse, we can iterate it backwards without mutating the list. The AsEnumerable needs to be there to prevent the List Reverse method from being used.
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