为什么 Decimal 的验证不适用于 ASP.NET Core 3.1 Razor Pages？

Question

Why validation for Decimal not work for ASP.NET Core 3.1 Razor Pages ?

Client side work, but after post data I get this server side validation message (ModelState.IsValid = false in my case). The value '1.000000' is not valid for...

Model property:

[Column(TypeName = "decimal(16, 6)")]
public decimal ValueFactor { get; set; }

View:

<input class="form-control" asp-for="@Model.ValueFactor" />
<span asp-validation-for="ValueFactor" class="text-danger"></span>

Answer 1

I found a solution, the thing is in the regional settings of my computer, where the decimal symbol is a comma. Server side wants dot for decimal separator, but my client side wants comma as you can see in picture, that's why there is inconsistency, for resolving this just you need to change Decimal symbol type as shown in picture.

Answer 2

Column attribute is Code First Data Annotation

For validation of decimal you need a combination of regex and range validations like below:

[RegularExpression(@"^\d+\.\d{6}$")]
[Range(0, 9999999999.999999)]

RegularExpression attribute above will accept ' any number of digits, follwed by dot(.) and then 6 digits'. So following numbers are accepted: 1.000000, 500000.000000 etx.

Range attribute accepts a number of type decimal(16,6) between 0 and 9999999999.999999

Answer 3

Try something like this on server side.

public class PersonModel
{
    [Required(ErrorMessage = "Required Decimal Number")]
    [RegularExpression(@"^[0-9]+(\.[0-9]{1,100})$", ErrorMessage = "Valid Decimal number with maximum  decimal places.")]
    public string Expenses { get; set; }
}

Answer 4

My model

    [Column(TypeName = "decimal(18,2)")]
    public Decimal Bonus { get; set; }

I created a view model.

    [Display(Name="Ek Ücret")]
    [RegularExpression(@"^(\d+),(\d{2})$", ErrorMessage = "Tutar 0,00 - 9999999999,99 aralığında olmalıdır. ")]
    public string Bonus { get; set; }