如何避免在View中提供空模型引用的异常

Question

In this Model "HomePageModel" contains three sub-models named as "JoinedClasses","RequestedClasses" and "tbl_Student". If a user still didn't have joined a class then its object passed should be null as shown in fig. and I have checked through if-condition to avoid from exception but it always throws "Object reference not set to an instance of an object.", how to avoid from this exception on null reference provision

Answer 1

.Equals() cannot be used to compare with null values, because if an object is null, it won't have the method .Equals() ! In your case, the method itself is throwing the Nullreference exception.

Just change to:

@if(Model.JoinedClasses != null) {
 //...code
}