Razor View Engine : An expression tree may not contain a dynamic operation

Question

I have a model similar to this:

public class SampleModel
{
     public Product Product { get; set; } 
}

And in my controller I get an exception trying to print out

@Html.TextBoxFor(p => p.Product.Name)

This is the error:

Exception: An expression tree may not contain a dynamic operation

If anyone can give me some clues on how to fix this I would really appreciate it!

Is this on MVC3 RC? Also can you show us what Product looks like? I was unable to reproduce it in MVC3 RC — bmancini, Nov 11 '10 at 15:35

score 322 · Accepted Answer · answered Nov 11 '10 at 19:28

322

It seems to me that you have an untyped view. By default, Razor views in MVC3 RC are typed as dynamic. However, lambdas do not support dynamic members. You have to strongly type your model. At the top of your view file add

@model SampleModel

answered Nov 11 '10 at 19:28

marcind

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it was an uppercase m that did it for me – whossname May 03 '16 at 11:30
what if you dot have a model ? – djack109 Nov 11 '19 at 19:37

score 109 · Answer 2 · edited May 28 '13 at 01:02

109

A common error that is the cause of this is when you add

@Model SampleModel

at the top of the page instead of

@model SampleModel

edited May 28 '13 at 01:02

abatishchev

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answered Jul 18 '12 at 13:19

felbus

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Thanks for appending this answer! Amazing how after years of programming you can forget about case sensitivity. – brentlightsey May 21 '13 at 01:16
2

Also can happen if you use "model" instead of "@Model" ... which will build but fail at runtime. – Dave Remy Apr 29 '15 at 00:23

score 9 · Answer 3 · edited May 23 '17 at 12:18

9

In this link explain about @model, see a excerpt:

@model (lowercase "m") is a reserved keyword in Razor views to declare the model type at the top of your view. You have put the namespace too, e.g.: @model MyNamespace.Models.MyModel

Later in the file, you can reference the attribute you want with @Model.Attribute (uppercase "M").

edited May 23 '17 at 12:18

Community

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answered Sep 16 '16 at 19:23

Charlestown

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This was my problem. If you're not watching carefully, Visual Studio tends to convert what you're typing into the capital "M". It's really irritating. – RobbieE Jan 24 '17 at 12:43

score 7 · Answer 4 · edited Apr 16 '15 at 07:48

7

Before using (strongly type html helper into view) this line

@Html.TextBoxFor(p => p.Product.Name)

You should include your model into you page for making strongly type view.

@model SampleModel

edited Apr 16 '15 at 07:48

Opal

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answered Apr 16 '15 at 07:31

Kuber

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score 7 · Answer 5 · answered Nov 11 '10 at 19:48

7

Seems like your view is typed dynamic. Set the right type on the view and you'll see the error go away.

answered Nov 11 '10 at 19:48

Esteban Araya

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score 2 · Answer 6 · answered Feb 05 '15 at 20:33

2

This error happened to me because I had @@model instead of @model... copy & paste error in my case. Changing to @model fixed it for me.

answered Feb 05 '15 at 20:33

JosephDoggie

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score 0 · Answer 7 · answered Apr 26 '20 at 09:00

0

On vb.net you must write @ModelType.

answered Apr 26 '20 at 09:00

Perry

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Razor View Engine : An expression tree may not contain a dynamic operation

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