MVC3 - 3 decimal places on type double with leading zero

Question

I have a field for weight in Kgs (type double or use something else??). In edit view I would like the user to enter numbers to the thousandth place<

Answer 1

To format the number just use

 @string.Format("{0:0.00}", Model.Weight);

or

 @Html.DisplayFor(x => string.Format("{0:0.00}", x.Weight));
 @Html.EditorFor(x => string.Format("{0:0.00}", x.Weight));

to Validate

public class Model
{
    [Required]
    public double Weight{ get; set; }
}

I wouldn't constrain the precision they put in, just make sure that it is a valid number using javascript. You might also constrain input to only include numbers and a period.

If the user puts in something wrong (i.e. not compatible with a double type), MVC will complain when it tries to bind to the model.

Answer 2

its very simple follow this method

so you have to insert DataFormatString="{0:#,##0.000#Kg}" only on gridview

Answer 3

You could use data annotations on your view model:

[DisplayFormat(DataFormatString = "{0:#,##0.000#}", ApplyFormatInEditMode = true)]
public double? Weight { get; set; }

and in your view

@Html.EditorFor(x => x.Weight)

will properly format the value in the input field.

Another possibility is to write a custom editor template for the double type (~/Views/Shared/EditorTemplates/double.cshtml):

@model double?
@Html.TextBox("", Model.HasValue ? Model.Value.ToString("#,##0.000#") : "")

and then in your view:

@Html.EditorFor(x => x.Weight)

or if you don't want to override all templates for all double types in your application you could put this into some custom template location like ~/Views/Shared/EditorTemplates/MyFormattedDouble.cshtml and then in your view:

@Html.EditorFor(x => x.Weight, "MyFormattedDouble")

Personally I prefer the first approach which uses data annotations to control the format of the double values.