Question

How to capture null reference exception in C#?

Answer 1

Answer:

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

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

Explanation: