How do I import a namespace in Razor View Page?

Question

How to import a namespace in Razor View Page?

You can also add alias to your imported namespace stackoverflow.com/questions/4798293/mvc3-import-namespace/… — Surjit Samra
– Surjit Samra, Commented Nov 14, 2011 at 13:54

Selim Yildiz · Accepted Answer · 2020-04-07 11:22:37Z

902

Finally found the answer.

@using MyNamespace

For VB.Net:

@Imports Mynamespace

Take a look at @ravy amiry's answer if you want to include a namespace across the app.

edited Apr 7, 2020 at 11:22

Selim Yildiz

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answered Jul 14, 2010 at 9:38

Amitabh

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9 Comments

Dan Esparza Over a year ago

Also: They can't go in code blocks. (You'll get a runtime error)

RPM1984 Over a year ago

Also you don't need the semicolon.

Tom Stickel Over a year ago

This is just bad practice period. Please do not add this to the top of your razor pages. This is messy etc... Correct way is to add to Views - web.config just as @Javad_Amiry points out.

Triynko Over a year ago

It's not bad practice. It's an absolutely necessary feature. web.config is like a global using statement that makes the namespace active in ALL your pages. That may not be what you want if you have classes with the same name in different namespaces. You'll still have a conflict if you try to use them in the same file, but you can resolve that easily within a single file. If you stick it in web.config, then the conflict would arise in all your pages that use either of the classes. So calling this bad practice makes no sense at all.

Triynko Over a year ago

I'm surprised Intellisense doesn't hint to add the using statement the same way it does in normal C# pages.

|

amiry jd · Accepted Answer · 2012-09-11 04:39:28Z

416

The first way is that use @using statement in .cshtml files, that imports a namespace to current file only, and the second:

In the "web.config" file in "Views" directory of your project (notice it is not the main web.config in project's root), find this section:

<system.web.webPages.razor>
  <pages pageBaseType="System.Web.Mvc.WebViewPage">
    <namespaces>
      <add namespace="System.Web.Mvc" />
      <add namespace="System.Web.Mvc.Ajax" />
      .
      .
      <!-- etc -->
    </namespaces>
  </pages>
</system.web.webPages.razor>

you can add your custom namespace like this:

<add namespace="My.Custom" />

that will add the namespace to all of .cshtml (and/or .vbhtml) files; also you can change views inheritance from here, like:

<pages pageBaseType="My.Custom.MyWebViewPage">

Regards.

UPDATE: Thanks to @Nick Silberstein to his reminder about areas! He said:

If you're working within an area, you must add the namespace within the Web.config under /Areas/<AreaName>/Views/ rather than /Views/

edited Sep 11, 2012 at 4:39

answered Jul 17, 2011 at 9:47

amiry jd

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8 Comments

amiry jd Over a year ago

@vtortola : which web.config? the web.config file in Views folder, not the main web.config in root folder. ok?

Nick Silberstein Over a year ago

I'd like to hopefully save someone a few minutes of pulling out their hair and say that if you're working within an area, you must add the namespace within the Web.config under /Areas/<AreaName>Views/ rather than /Views/.

amiry jd Over a year ago

@MatthijsWessels No it does not need to restart VS. Just build the project and it will take effect. At least I do this always. If a view is open, you have to close that view before build and re-open it after after build.

Matthijs Wessels Over a year ago

@Javad_Amiry, aha, I did rebuild, but didn't close the view.

Tom Stickel Over a year ago

Yes, this is the correct way. Not the Using statement at top of Razor page like in the OP selected answer....

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Alper Şaldırak · Accepted Answer · 2016-01-19 08:03:06Z

34

For Library

@using MyNamespace

For Model

@model MyModel

answered Jan 19, 2016 at 8:03

Alper Şaldırak

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2 Comments

FrenkyB Over a year ago

Why is there no ; at the end?

Mark Over a year ago

@FrenkyB because this isn't C# code, it's Razor code. The using at the beginning of a .cs file is a C# compiler keyword. The @using at the beginning of a .cshtml file is a hint to the Razor template engine.

Germán · Accepted Answer · 2010-07-28 22:58:24Z

27

In ASP.NET MVC 3 Preview1 you can import a namespace on all your razor views with this code in Global.asax.cs

Microsoft.WebPages.Compilation.CodeGeneratorSettings.AddGlobalImport("Namespace.Namespace");

I hope in RTM this gets done through Web.config section.

edited Jul 28, 2010 at 22:58

answered Jul 28, 2010 at 6:47

Germán

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2 Comments

Andrew Stanton-Nurse Over a year ago

There will be a web.config section in RTM, but we also wanted to provide an API to do this because many users are starting to gravitate away from config. So we have both options available for you!

Germán Over a year ago

As of ASP.NET MVC 3 Beta this method no longer works. There is a new web.config section as explained here stackoverflow.com/questions/3875207/… . The AddGlobalImport method for importing a global namespace to all views has been moved to this class System.Web.WebPages.Razor.WebPagesRazorHost

k-dev · Accepted Answer · 2011-04-27 04:46:14Z

16

I found this http://weblogs.asp.net/mikaelsoderstrom/archive/2010/07/30/add-namespaces-with-razor.aspx which explains how to add a custom namespace to all your razor pages.

Basically you can make this

using Microsoft.WebPages.Compilation;
public class PreApplicationStart
{
   public static void InitializeApplication()
   {
       CodeGeneratorSettings.AddGlobalImport("Custom.Namespace");
   }
}

and put the following code in your AssemblyInfo.cs

[assembly: PreApplicationStartMethod(typeof(PreApplicationStart), "InitializeApplication")]

the method InitializeApplication will be executed before Application_Start in global.asax

edited Apr 27, 2011 at 4:46

answered Apr 27, 2011 at 4:40

k-dev

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2 Comments

jahu Over a year ago

This is actually a rather good answer, but the location of Microsoft.WebPages.Compilation.AddGlobalImport was changed to System.Web.WebPages.Razor.WebCodeRazorHost.AddGlobalImport.

jahu Over a year ago

The big advantage of using this method comes from the fact that the namespace will be usable in all views (including those within areas) while being declared in just one place.

user933765 · Accepted Answer · 2011-09-07 23:25:35Z

14

One issue that you must know is that when you import a namespace via web.config in Views folder, that namespace is imported JUST for views in that folder. Means if you want to import a namespace in an area views, you must also import that namespace, in that area's web.config file, located in area's Views folder;

answered Sep 7, 2011 at 23:25

user933765

Comments

Mahaveer Jangid · Accepted Answer · 2018-08-11 12:26:48Z

12

For namespace and Library

@using NameSpace_Name

For Model

@model Application_Name.Models.Model_Name

For Iterate the list on Razor Page (You Have to use foreach loop for access the list items)

@model List<Application_Name.Models.Model_Name>

@foreach (var item in Model)
   {  
          <tr>
                <td>@item.srno</td>
                <td>@item.name</td>
         </tr>  
   }

answered Aug 11, 2018 at 12:26

Mahaveer Jangid

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Comments

Abhishek Siddhu · Accepted Answer · 2017-07-01 20:54:38Z

11

You can try this

@using MyNamespace

answered Jul 1, 2017 at 20:54

Abhishek Siddhu

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Comments

Howard · Accepted Answer · 2011-01-15 16:28:43Z

3

"using MyNamespace" works in MVC3 RTM. Hope this helps.

answered Jan 15, 2011 at 16:28

Howard

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Comments

jarlh · Accepted Answer · 2015-12-03 15:33:24Z

3

I think in order import namespace in razor view, you just need to add below way:

@using XX.YY.ZZ

edited Dec 3, 2015 at 15:33

jarlh

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answered Dec 3, 2015 at 13:39

HiteshAjudiya

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Comments

Imran Javed · Accepted Answer · 2019-08-06 10:16:40Z

1

Depending on your need you can use one of following method:

In first line/s of view add "using your.domainName;" (if it is required in specific view only)
if required in all subsequent views then add "using your.domainName;" in _ViewStart.cshtml. You can find more about this in: Where and how is the _ViewStart.cshtml layout file linked?
Or add Assembly reference in View web.config as described by others explained in: How do you implement a @using across all Views in Asp.Net MVC 3?

edited Aug 6, 2019 at 10:16

answered Aug 6, 2019 at 10:07

Imran Javed

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Comments

Munirul Islam · Accepted Answer · 2023-11-09 05:45:01Z

0

in C# you can do it in the following ways

@using Microsoft.AspNetCore.Http;

answered Nov 9, 2023 at 5:45

Munirul Islam

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