nullreferenceexception was unhandled by user code object reference not set to an instance of an object

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How can I get around this exception?

C#

@foreach (var genre in Model)
{
     @Html.ActionLink(genre.Name,"Browse",new {genre=genre.Name})
}

Posted 19-Dec-12 22:24pm

loylmed

Updated 19-Dec-12 23:27pm

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

v2

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earloc 20-Dec-12 4:59am

what line is causing the Exception? could only be trying to get the enumerator for "Model" or accessing the "Name"-Property of a null reference in "genre"

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Keith Barrow · Answer 1 · 2012-12-20T03:18:00

If you have supplied the lines of code that are throwing, and Name is a string, then genre is null.

You make sure genre is not null. The most likely solution to you problem is to skip the link creation there are a few ways to do this, but I'm not sure which'll work in Razor. this should be safe:

C#

@foreach (var genre in Model)
{
     if(genre != null)
     {
         @Html.ActionLink(genre.Name,"Browse",new {genre=genre.Name})
     }
}

if you want to be really belt & braces and avoid any empty links

SQL

@foreach (var genre in Model)
{
     if(genre != null && !string.IsNullOrWhiteSpace(genre.Name))
     {
         @Html.ActionLink(genre.Name,&quot;Browse&quot;,new {genre=genre.Name})
     }
}

Of course, the last example is only good if Name is a string.

The other thing you should check is the code that fills Model, the chance are there shouldn't be any nulls in there.