Asp.net MVC Razor apply filter to response texts

Question

I need to apply a simple filter to any text that will be printed to page using razor command @.
in example see below codes:

public static class MyHelper
{
    public string MyFilter(this string txt)
    {
        return txt.Replace("foo", "bar");
    }
}

in this .cshtml view file

@{
    var text = "this is foo!!";
}
<div>@text</div>

I expect somehow to print this is bar!! instead of this is foo!!

Why would you do that in the view as opposed to in the controller (where it should be done)? — , Aug 22 '16 at 10:10
@StephenMuecke because the text that will be printed could be in a dataset or a variable or whatever possible and I think it's more simple to apply filter to razor response than run a function on each field of rows of a dataset. — mhesabi, Aug 22 '16 at 10:15
Your logic should be done in the controller, not the view (and your cant just _apply a filter to razor response_) — , Aug 22 '16 at 10:18
How does your view know to use the `MyFilter` method? From what I see, you are simply creating a variable called `text` and then assigning it a string.. then displaying it in the view... You are not using the `MyFilter` method whatsoever in the view — Grizzly, Aug 22 '16 at 12:40

feeeper · Accepted Answer · 2016-08-22T18:29:45.873

0

As @AdilMammadov said you can use HtmlHelper for that.

Simple C# class with static method:

using System;
namespace MvcApplication1.MyHelpers
{
    public class MyHelpers
    {
        public static string FooReplacer(string txt)
        {
            return txt.Replace("foo", "bar");
        }
    }
}

And use the helper in your view:

@using MvcApplication1
...
<p>@MyHelpers.FooReplacer("foo foo")</p> <!--returns <p>bar bar</p>-->

edited Aug 22 '16 at 18:29

answered Aug 22 '16 at 11:38

feeeper

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In the view you have to specify the model.. why are you using a `using` statement in the View? That should be changed to `@model MvcApplication1.MyHelpers`.. then when you call the `FooReplacer` method you just have to do `Model.FooReplacer("foo foo")` – Grizzly Aug 22 '16 at 12:52
@BviLLe_Kid You're right that I can use `@model MvcApplication1.MyHelpers` but as I know my approach is also works fine http://stackoverflow.com/a/3244924/1821692 – feeeper Aug 22 '16 at 13:01

Grizzly · Answer 2 · 2016-08-22T13:06:19.470

0

I believe you are close. The only problem is that your View doesn't know to use your filter because you didn't specify that within your View.

This should work:

Model

public static class MyHelper
{
    public string MyFilter(this string txt)
    {
        return txt.Replace("foo", "bar");
    }
}

View

@model AssemblyName.MyHelper

@{
    Layout = null;
    var text = Model.MyFilter("Let's go to the foo");
}
<div>@text</div>

// will display "Let's go to the bar"

I have created a dotnetfiddle for you, to show that this will work.

Hope this helps!

edited Aug 22 '16 at 13:06

answered Aug 22 '16 at 12:50

Grizzly

5,873
8
56
109

Please mark either one of the answers provided as accepted so that this question can be marked as answered! – Grizzly Aug 25 '16 at 13:26

Asp.net MVC Razor apply filter to response texts

2 Answers2