Can we store different data types in ArrayList in C#?

Can we store different data types in ArrayList in C#?

Yes, you can store objects of different types in an ArrayList but, like pst mentioned, it’s a pain to deal with them later. If the values are related in some way you are probably better off writing a class to hold them.

Can ArrayList be null?

null is a perfectly valid element of an ArrayList.

What are the methods available for ArrayList C#?


Method Description
ReadOnly(IList) Returns a read-only IList wrapper.
Remove(Object) Removes the first occurrence of a specific object from the ArrayList.
RemoveAt(Int32) Removes the element at the specified index of the ArrayList.
RemoveRange(Int32, Int32) Removes a range of elements from the ArrayList.

Can an ArrayList hold elements of different data types?

ArrayList cannot hold primitive data types such as int, double, char, and long. With the introduction to wrapped class in java that was created to hold primitive data values. Objects of these types hold one value of their corresponding primitive type(int, double, short, byte).

Can an ArrayList hold multiple data types?

It is more common to create an ArrayList of definite type such as Integer, Double, etc. But there is also a method to create ArrayLists that are capable of holding Objects of multiple Types. We will discuss how we can use the Object class to create an ArrayList. Object class is the root of the class hierarchy.

How do you make an ArrayList null?

There are two ways to empty an ArrayList – By using ArrayList. clear() method or with the help of ArrayList. removeAll() method. Although both methods do the same task the way they empty the List is quite different.

How do you assign an ArrayList to null?

ArrayList clear() syntax clear() method does simple thing. It iterates the backing array inside arraylist and assign all elements ‘null’ value and set the size attribute to ‘0’ .

Why ArrayList is non generic type C#?

In C#, the ArrayList is a non-generic collection of objects whose size increases dynamically. It is the same as Array except that its size increases dynamically. An ArrayList can be used to add unknown data where you don’t know the types and the size of the data.

Can an ArrayList contain multiple types?

Can an ArrayList hold primitives?

What happens if you add null to ArrayList?

An ArrayList element can be an object reference or the value null . When a cell contains null , the cell is not considered to be empty. The picture shows empty cells with an “X” and cells that contain a null with null . The cells that contain null are not empty, and contribute to the size of the list.

Does ArrayList initialize as null?

If your breakpoint is on the initialization line, that line has note yet executed and the value will still be null. The breakpoint is after that line is executed, and that’s where it’s showing as null . And no, it is not being reinitialized as null later.

Which is faster ArrayList or list in C#?

An array is faster and that is because ArrayList uses a fixed amount of array. However when you add an element to the ArrayList and it overflows. It creates a new Array and copies every element from the old one to the new one. List over arrays.

What is the difference between ArrayList and generics?

Generic List stores all data of the data type it is declared thus to getting the data back is hassle free and no type conversions required. 4. Generic List must be used instead of ArrayList unless specific requirement for projects higher than . Net 2.0 Framework.

Is ArrayList strongly typed C#?

ArrayList belongs to System. Insertion and deletion operation in ArrayList is slower than an Array. Arrays are strongly typed which means it can store only specific type of items or elements. ArrayList are not strongly typed.

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