CODEWITHSUNDEEP
c#asp.net-mvcrazordecimalrounding
Farrukh Normuradov
Farrukh Normuradov

Reputation: 1194

Why razor is rounding to a decimal type to 2 decimal places automatically?

This is the field I have in my View Model:

public decimal MyValue { get; set; }

Here is how I show the value in a View:

@Html.EditorFor(model => model.MyValue)

I debugged all the way from DB and turned off all JS. I still get that model in View has value 12.34345, but the final value that is presented to a user is 12.34.

This question is asking HOW to tackle this but WHY is left unclear.

Interestingly, when I use:

@Html.HiddenFor(model => model.MyValue)

rounding is not happening.

Upvotes: 9

Views: 5712

Answers (2)

Mads...
Mads...

Reputation: 391

Please take a look at below source code https://github.com/aspnet/Mvc/blob/6436538068d19c475d5f7c9ce3d0080d2314f69d/src/Microsoft.AspNetCore.Mvc.ViewFeatures/Internal/DefaultEditorTemplates.cs

see below method 

public static IHtmlContent DecimalTemplate(IHtmlHelper htmlHelper)
{
        if (htmlHelper.ViewData.TemplateInfo.FormattedModelValue == htmlHelper.ViewData.Model)
        {
            htmlHelper.ViewData.TemplateInfo.FormattedModelValue =
                string.Format(CultureInfo.CurrentCulture, "{0:0.00}", htmlHelper.ViewData.Model);
        }

        return StringTemplate(htmlHelper);
}

Upvotes: 1

user3559349
user3559349

Reputation:

It is a function of the default EditorTemplate for decimal. Form the source code (note the format is "{0:0.00}")

internal static string DecimalTemplate(HtmlHelper html)
{
    if (html.ViewContext.ViewData.TemplateInfo.FormattedModelValue == html.ViewContext.ViewData.ModelMetadata.Model)
    {
        html.ViewContext.ViewData.TemplateInfo.FormattedModelValue = String.Format(CultureInfo.CurrentCulture, "{0:0.00}", html.ViewContext.ViewData.ModelMetadata.Model);
    }
    return StringTemplate(html);
}

If you want to display the decimal places as saved, use @Html.TextBoxFor(m => m.MyValue), or you can apply your own format using the DisplayFormatAttribute, which will be respected by the EditorFor() method, for example

[DisplayFormat(DataFormatString = "{0:0.00000}", ApplyFormatInEditMode = true)]`
public decimal MyValue { get; set; }

Upvotes: 11

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