CODEWITHSUNDEEP
c#asp.net-mvcasp.net-mvc-4
Ian Vink
Ian Vink

Reputation: 68840

MVC 4 - Building a Helper that accesses ViewData

I am trying to build a helper which can execute this logic:

if (ViewData.ModelState[""] != null && ViewData.ModelState[""].Errors.Any())
{
    <div class="note note-danger">
        <h4 class="block">Errors</h4>
        <p>@Html.ValidationSummary()</p>
    </div>
}

It would need access to the ViewData and the Html.ValidationSummary

Do these need to be sent into the Helper, of can the Helper access them in some way by some base class?

My Helper:

public static class ValidationSummaryHelper
{
    public static HtmlString Summary(???)
    { }}

Upvotes: 3

Views: 1892

Answers (2)

Tomi Lammi
Tomi Lammi

Reputation: 2126

Same in C#

public static class ValidationExtensions
{
        public static MvcHtmlString AddCustomValidationSummary(this HtmlHelper htmlHelper)
        {
            string result = "";

            if (htmlHelper.ViewData.ModelState[""] != null && htmlHelper.ViewData.ModelState[""].Errors.Any())
            {
                result = "<div class='note note-danger'><h4 class='block'>Errors</h4><p>" + htmlHelper.ValidationSummary().ToString() + "</p></div>";
            }

            return new MvcHtmlString(result);
        }
}

Upvotes: 2

Sam Axe
Sam Axe

Reputation: 33738

I don't know the syntax for it in C#, but in VB it would look like this:

<Extension>
Public Function AddCustomValidationSummary(htmlHelper As HtmlHelper) As MvcHtmlString
    Dim result As String = String.Empty

    If (htmlHelper.ViewData.ModelState("") Is Nothing) AndAlso (htmlHelper.ViewData.ModelState("").Errors.Any()) Then
        result = "<div class='note note-danger'><h4 class='block'>Errors</h4><p>" & htmlHelper.ValidationSummary().ToString() & "</p></div>"
    End If

    Return New MvcHtmlString(result)
End Function

Use it like:

@Html.AddCustomValidationSummary()

Upvotes: 3

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