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I have a class that has an list<Book> in it, and those Book objects has many many properties.
How can I remove from that list every Book that his level value is different than, for example, 5?
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How to Remove an Element from a List Using the remove() Method in Python. To remove an element from a list using the remove() method, specify the value of that element and pass it as an argument to the method. remove() will search the list to find it and remove it.
There are two ways to remove objects from ArrayList in Java, first, by using the remove() method, and second by using Iterator. ArrayList provides overloaded remove() method, one accepts the index of the object to be removed i.e. remove(int index), and the other accept objects to be removed, i.e. remove(Object obj).
You can use the pop() method to remove specific elements of a list. pop() method takes the index value as a parameter and removes the element at the specified index. Therefore, a[2] contains 3 and pop() removes and returns the same as output.
In this particular case, List<T>.RemoveAll is probably your friend:
C# 3:
list.RemoveAll(x => x.level != 5);
C# 2:
list.RemoveAll(delegate(Book x) { return x.level != 5; });
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