Cannot convert lambda expression to type 'object' because it is not a delegate type with an int

Question

I have a List of patients. One of the properties of the Patient class is PatientId which is an int. My list is initialized like:

List<Patient> = new List<Patient>() { new Patient { PatientId = 1, 
                                                    FirstName = "Jane", 
                                                    LastName = "Doe"}};

When I access PatientId in my view with something like:

@Html.DisplayForModel(modelItem => modelItem.PatientId) //Error

I get an error: Cannot convert lambda expression to type 'object' because it is not a delegate type

have you tried @Html.DisplayFor(modelItem => modelItem.PatientId)? — Darko Kenda
– Darko Kenda, Commented Apr 26, 2013 at 18:19

Travis J · Accepted Answer · 2013-04-26 18:21:34Z

5

DisplayForModel actually uses Display Templates to display your model and is normally called without parameters. If this is what you intended then you will have to make a new DisplayTemplate. For anyone interested, here is a nice tutorial by Phil Haack on Display Templates and DisplayForModel: http://haacked.com/archive/2010/05/05/asp-net-mvc-tabular-display-template.aspx.

However, if you just wanted to have a label for that field, then you should just use DisplayFor

@Html.DisplayFor(modelItem => modelItem.PatientId)

answered Apr 26, 2013 at 18:21

Travis J

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3 Comments

Xaisoft Over a year ago

OK, When I auto-generated my view, it put everything in except PatientId, so it put in @Html.DisplayForModel(modelItem=>modelItem.FirstName). I am still confused on why it does not work for int's.

Xaisoft Over a year ago

OK, my bad I am an idiot, I don't know why I was seeing DisplayForModel, it has DisplayFor on everything. Time for new glasses. How is the chess coming along?

Travis J Over a year ago

@Xaisoft - Really threw me for a loop there, I could not find out why DisplayForModel was autogenerated for ints :P The chess is good.

aquaraga · Accepted Answer · 2013-04-26 18:23:39Z

3

You've confused between @Html.DisplayFor() and @Html.DisplayModelFor(). The former takes in a lambda. In your case, you could use @Html.DisplayFor(model => model.PatientId)

answered Apr 26, 2013 at 18:23

aquaraga

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1 Comment

Xaisoft Over a year ago

Thanks, I was seeing DisplayForModel, but it was actually DisplayFor.

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