MVC3 Decimal truncated to 2 decimal places on edit

问题:

I'm running MVC3 with Razor and noticed that decimal values are truncated to 2 decimal places when in edit mode. I've managed to get round it by annotating my property with a display format. This doesn't seem like a very good solution as I'll have to remember to do this for every new view I generate (or update my templates).

I have checked the value returned by our service to the controller and it is correct at 1.144, but when bound to the view it comes out as 1.14 in the TextBox

ViewModel Property

[Required]
[Display(Name = "Unit Price")]
public decimal UnitPrice { get; set; }

.cshtml Code

@Html.LabelFor(model => model.UnitPrice) 
@Html.EditorFor(model => model.UnitPrice) 
@Html.ValidationMessageFor(model => model.UnitPrice)

If I decorate the property with the following then it works.

[DisplayFormat(
               ApplyFormatInEditMode = true, 
               DataFormatString = "{0:0.00###########################}", 
               NullDisplayText = "")]

Any Ideas?

回答1:

That's how the default Decimal editor template is defined:

<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl" %>
<script runat="server">
    private object ModelValue {
        get {
            if (ViewData.TemplateInfo.FormattedModelValue == ViewData.ModelMetadata.Model) {
                return String.Format(
                    System.Globalization.CultureInfo.CurrentCulture,
                    "{0:0.00}", ViewData.ModelMetadata.Model
                );
            }
            return ViewData.TemplateInfo.FormattedModelValue;
        }
    }
</script>
<%= Html.TextBox("", ModelValue, new { @class = "text-box single-line" }) %>

Notice the {0:0.00} format.

So you have two possibilities:

1. Use double instead of decimal as type in your model

2. Modify the default editor template by creating a custom ~/Views/Shared/EditorTemplates/Decimal.cshtml which might simply look like this:

   @Html.TextBox(
       "", 
       ViewData.TemplateInfo.FormattedModelValue, 
       new { @class = "text-box single-line" }
   )
   

You probably might want to modify the display template as well.

回答2:

If you don't need the functionality of the 'EditorFor' HtmlHelper, you can simply swap it out for the 'TextBoxFor' and it shouldn't truncate your decimal value...

回答3:

IMO, this article has a better option:

html-editorfor-with-3-decimal-places

I used this code to display up to 4 decimal digits in my EditFor:

    [Display(Name = "Discount Percentage")]
    [Range(0, 100.0)]
    [DisplayFormat(DataFormatString="{0:0.0000}", ApplyFormatInEditMode=true)]
    public Decimal? DiscountPercent { get; set; }