How to capture null reference exception in C#?

It handles errors generated from referencing a null object. The Null reference exception occurs when you are looking to access member fields or function types that points to null.

Let’s say we have the following null string −

string str = null;

Now you try to get the length of the null string, then it would cause an exception −

If(str.Length == null) {}

Above the exception will be thrown. Now let us seen how to prevent the null pointer exception to be thrown −

Example

 Live Demo

using System;

class Program {
   static void Main() {
      int[] arr = new int[5] {1,2,3,4,5};
      display(arr);

      arr = null;
      display(arr);
   }

   static void display(int[] arr) {
      if (arr == null) {
         return;
      }
      Console.WriteLine(arr.Rank);
   }
}

Output

1