Create Custom helpers Asp.net MVC 3

Question

I want to create a custom asp.net mvc3 helper .

To use that helper, I should write syntax like below

@Html.DisplayMyCustomHelper(model => model.FullName)

Expected Output

Full Name (Value Picked from model's Display attribute)= Current Value Of Property

Eg:

public Class User
{
      [Display(Name="Full Name")]
      public string FullName{get;set;}
}

User = new User{FullName="Tom Cruise"};

Inside Razor

@model User
@Html.DisplayMyCustomHelper(model => model.FullName)

Expected OutPut

Full Name= Tom Cruise

How can i do this?

asp.net/mvc/tutorials/creating-custom-html-helpers-cs this is good tutorial to create custom helpers in mvc — Jayantha Lal Sirisena
– Jayantha Lal Sirisena, Commented Jul 6, 2011 at 7:11

archil · Accepted Answer · 2011-07-06 07:13:13Z

1

public static MvcHtmlString DisplayMyCustomHelper<TModel, TValue>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TValue>> expression)
    {
        const string format = "{0} = {1}";

        var metadata = ModelMetadata.FromLambdaExpression<TModel, TValue>(expression, htmlHelper.ViewData);

        var model = metadata.Model;

        var result = string.Format(format, metadata.DisplayName, model == null ? string.Empty : model.ToString());

        return MvcHtmlString.Create(result);
    }

answered Jul 6, 2011 at 7:13

archil

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4 Comments

Praveen Prasad Over a year ago

it worked, i will accept it in few hours, just make one change in your answer , inside string.format replace "metadata.DisplayName" with "metadata.DisplayName ?? metadata.PropertyName"

archil Over a year ago

@Praveen man, every piece of code written on stack overflow as answers is not the one to directly copy and paste in your production environment. The general idea is shown in my answer, and you are free do change what ever you want in it : )

Praveen Prasad Over a year ago

he he, u are right. Could you suggest me how to do this | helper inside view = "@Html.MyDisplayFor(m => m)" , how to loop thru each property of model inside method "MyDisplayFor"

archil Over a year ago

Take a look at bradwilson.typepad.com/blog/2009/10/…, section Tabular Layout, in Object template brad explains what you want

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