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TerryBittar
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Asked: 2021-09-08T17:20:21+03:00 In:

How to check if List empty or null in C#

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I have a list of items and it is maybe empty or null. I need to check if the list contains any List-item or is empty and if not then add an object to the List in C#?

// I have a list, but sometimes it doesn’t have any data added to it

var myList = new List<object>();
 
var myList = new List<object>();

// Expression is always false

if (myList == null)
Console.WriteLine(“List is never null”);
if (myList[0] == null)
myList.Add(“new item”);

//Errors encountered:  Index was out of range. Must be non-negative and less than the size of the collection.

// Inner Exception says “null”

c#
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    1 Answer

    1. Hassan AbdElrahman
      Master Oracle ACE Pro ♠ | Oracle Senior ERP Technical Consultant
      This answer was edited.

      Check if the list is empty in C#

      You can check whether the list is empty or not in many ways.

      • The first approach is to check for null, and if the count is greater than zero

       

      Example:

      if (strList != null && strList.Count > 0)
{
Console.WriteLine("The List has " + strList.Count + " records"); 
}

      Output:

      The List has 10 records

       

      • The second approach is to use the LINQ method called “.any()”

       

      Example:

      if ((strList != null) && (!strList .Any()))
{
Console.WriteLine("The List has more than one record"); 
}

      Output:

      The List has more than one record

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