In Startup.cs I have this code:

public void ConfigureServices(IServiceCollection services)
{
    ...

    services.Configure<RequestLocalizationOptions>(options =>
    {
         CultureInfo en_GB = new CultureInfo("en-GB");
         en_GB.NumberFormat.NumberDecimalSeparator = ".";
         en_GB.NumberFormat.NumberGroupSeparator = ",";

         CultureInfo[] supportedCultures = new[]
         {
             en_GB
         };

         options.DefaultRequestCulture = new RequestCulture(en_GB, en_GB);

         options.SupportedCultures = supportedCultures;
         options.SupportedUICultures = supportedCultures;
    });

    ...
}

And then when I return a decimal value from backend to a view

@model decimal

<span>@Model</span>

it renders the number (for example 123456789.012) as:

123456789.012

Whereas instead it should've been:

123,456,789.012

And I know that some of you will say that I can convert it to string in the view, for example:

@model decimal

@{
    var numberFormatter = new CultureInfo("en-GB").NumberFormat;
    numberFormatter.NumberDecimalSeparator = ".";
    numberFormatter.NumberGroupSeparator = ",";
    var myFormattedNumber = Model.ToString("#,###.###", numberFormatter);
}

<span>@Model</span>

And yes, this will show:

123,456,789.012

But I need a solution where I am not forced to convert the numbers manually to string in order to show the right format. Isn't there a possibility to do so automatically? Also, why is only NumberDecimalSeparator working properly (I can even use any other character instead of "." and it works, for example "~" or ";") but NumberGroupSeparator doesn't work at all. I also think there are similar issues with the other attributes of NumberFormat such as NumberDecimalDigits or NumberGroupSizes etc.

CodePudding user response：

When you configure Localization in startup.cs, You also need to use Standard numeric format strings to format data in the View.

For Example:

I configure localization like this:

var app = builder.Build();
   
//i am using RequestLocalization middleware to configure localization in .Net 6
var defaultDateCulture = "en-GB";
var ci = new CultureInfo(defaultDateCulture);
ci.NumberFormat.NumberDecimalSeparator = "!";
ci.NumberFormat.NumberGroupSeparator = "~";

// Configure the Localization middleware
app.UseRequestLocalization(new RequestLocalizationOptions
{
    DefaultRequestCulture = new RequestCulture(ci),
    SupportedCultures = new List<CultureInfo>
    {
        ci,
    },
    SupportedUICultures = new List<CultureInfo>
    {
        ci,
    }
});

//..other middleware.... 

In the View, I use N key word to format common numeric type.

@model decimal

<h1>@Model.ToString("N")</h1>

Result:

You can see the format of decimal is what we set in localization.

Refer to this Docs to check more Standard numeric format strings.