How to handle null values in mvc view?

Question

<li>
   <%=Html.UITemplates().FieldLong().TextBox("OrderRequest.AdditionalParties[0].ContactDetails[0].Address.Line1", "Address", Model.OrderRequest.AdditionalParties[0].Address.Line1)%>
</li>

The above line when Address is null throws a null reference exception. I don't know how to handle it as I still want to display view while Address.Line1 should be displayed as empty string.

What is Html.UITemplates().FieldLong().TextBox()? Its not part of MVC — user3559349
– user3559349, Commented Feb 18, 2016 at 21:30
Model.OrderRequest.AdditionalParties[0].Address == null ? string.Empty : Model.OrderRequest.AdditionalParties[0].Address.Line1 %> try this. — vendettamit
– vendettamit, Commented Feb 18, 2016 at 21:31
You'll need to null-check every part of that object chain. Just the Address property is taking a risk. It's better to work with smaller models to keep things clean. — MartijnK
– MartijnK, Commented Feb 18, 2016 at 21:33
@StephenMuecke yes it's not part of mvc. They are custom html helpers in my project. — NoStressDeveloper
– NoStressDeveloper, Commented Feb 18, 2016 at 21:54
The you should show them. If you have written this helper correctly, then all you need is Html.UITemplates().FieldLong().TextBox("OrderRequest.AdditionalParties[0].ContactDetails[0].Address.Line1") which will set the value attribute to value="" if its null, and no exception will be thrown — user3559349
– user3559349, Commented Feb 18, 2016 at 21:57

vendettamit · Accepted Answer · 2016-02-18 21:56:35Z

2

You can simply use the conditional operator to check the null values on any object. So in your case it would be:

Model.OrderRequest.AdditionalParties[0].Address == null ? string.Empty : Model.OrderRequest.AdditionalParties[0].Address.Line1 %>

answered Feb 18, 2016 at 21:56

vendettamit

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