System.Web.Mvc missing reference to ModelClientValidationRule

Question

I am trying to write some client validation in a class library. I added a reference to System.Web.Mvc on my local machine here C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET MVC 4\Assemblies\System.Web.Mvc.dll but I am getting the error

The type or namespace ModelClientValidationRule could not be found (are you missing a using directive or an assembly reference?)

I am targeting .Net Framework 4 and this MSDN link indicates that should be correct, so I am little stumped as the why the error is occurring.

I am using VS2013 and have .Net 4.5 on my local machine, and have written client validation in other projects. I expect that I could resolve this issue by adding the MVC NuGet package, but I would like to explore the alternatives.

Possible duplicate of Build Errors - 'System.Web.Mvc.ModelClientValidationRule' Conflicts — Matt
– Matt, Commented May 11, 2016 at 10:11

Nils O · Accepted Answer · 2015-04-22 11:08:40Z

9

While ModelClientValidationRule is in the namespace System.Web.Mvc, it is in the assembly System.Web.WebPages, so you need to reference that assembly too.

answered Apr 22, 2015 at 11:08

Nils O

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3 Comments

Nils O Over a year ago

For future reference: if you have a similar problem in the future look at the msdn page for the class you need it will name the assembly the class is in.

Sreerejith S S Over a year ago

Please view grandhah.blogspot.in/2015/07/… I have explained the custom validation for data annotation

Matt Over a year ago

@NilsO: It is not always that easy (I wish it was) - in my case, the error occurred after doing a NUGET update of MVC - although System.Web.MVC.dll was updated, ModelClientValidationRule was no longer available. Referencing the old DLL fixes the issue, but I want to use the new one. I am still looking for a solution - no luck in MSDN or via Mr.Google so far. Similar question (no answer yet): here

Amir · Accepted Answer · 2016-02-05 02:21:16Z

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In addition to Nils answer, you may need to add Microsoft.ASP.NET.MVC package from NuGet.

answered Feb 5, 2016 at 2:21

Amir

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