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If the pointer is NULL, then it is the last node in the list. A linked list is held using a local pointer variable which points to the first item of the list. If that pointer is also NULL, then the list is considered to be empty.
isEmpty() method of CollectionUtils can be used to check if a list is empty without worrying about null list. So null check is not required to be placed everywhere before checking the size of the list.
So in common linked list implementations, end-of-list is represented with a null pointer, and so emptiness can be detected by the head of the list being the end - i.e being a nullptr.
The list::empty() is a built-in function in C++ STL is used to check whether a particular list container is empty or not. This function does not modifies the list, it simply checks whether a list is empty or not, i.e. the size of list is zero or not.
You can use Enumerable.Any:
bool isEmpty = !list.Any();
if(isEmpty)
{
// ...
}
If the list could be null you could use:
bool isNullOrEmpty = list?.Any() != true;
If the list implementation you're using is IEnumerable<T> and Linq is an option, you can use Any:
if (!list.Any()) {
}
Otherwise you generally have a Length or Count property on arrays and collection types respectively.
If (list.Count==0){
//you can show your error messages here
} else {
//here comes your datagridview databind
}
You can make your datagrid visible false and make it visible on the else section.
What about using the Count property.
if(listOfObjects.Count != 0)
{
ShowGrid();
HideError();
}
else
{
HideGrid();
ShowError();
}
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