Set Cultureinfo in ASP.NET Core to Have a . as Currencydecimalseparator Instead of ,

Set CultureInfo in Asp.net Core to have a . as CurrencyDecimalSeparator instead of ,

This is what solves it for me:

Setting the following in StartUp.Configure

var cultureInfo = new CultureInfo("en-US");
cultureInfo.NumberFormat.CurrencySymbol = "€";

CultureInfo.DefaultThreadCurrentCulture = cultureInfo;
CultureInfo.DefaultThreadCurrentUICulture = cultureInfo;

.NET Core localization globalization

you can use bellow code

Startup.ConfigureServices

CultureInfo[] supportedCultures = new[]
       {
        new CultureInfo("ar"),
        new CultureInfo("fa"),
        new CultureInfo("en")
    };

    services.Configure<RequestLocalizationOptions>(options =>
    {
        options.DefaultRequestCulture = new RequestCulture("ar");
        options.SupportedCultures = supportedCultures;
        options.SupportedUICultures = supportedCultures;
        options.RequestCultureProviders = new List<IRequestCultureProvider>
            {
                new QueryStringRequestCultureProvider(),
                new CookieRequestCultureProvider()
            };

    });

Startup.Configure

app.UseRequestLocalization();

change language:

[HttpPost]
public IActionResult SetLanguage(string culture, string returnUrl)
{
    Response.Cookies.Append(
        CookieRequestCultureProvider.DefaultCookieName,
        CookieRequestCultureProvider.MakeCookieValue(new     RequestCulture(culture)),
    new CookieOptions { Expires = DateTimeOffset.UtcNow.AddYears(1) }
    );

    return LocalRedirect(returnUrl);
}

More Details: here

Trying to set the decimal separator for the current language, getting Instance is read Only

You need to create a new culture and you can use the current culture as a template and only change the separator.
Then you must set the current culture to your newly created one as you cannot change the property within current culture directly.

string CultureName = Thread.CurrentThread.CurrentCulture.Name;
CultureInfo ci = new CultureInfo(CultureName);
if (ci.NumberFormat.NumberDecimalSeparator != ".")
{
    // Forcing use of decimal separator for numerical values
    ci.NumberFormat.NumberDecimalSeparator = ".";
    Thread.CurrentThread.CurrentCulture = ci;
 }

Using NumberFormat property in ASP.NET Core

You can add UseRequestLocalization to the Configure() method in Startup.cs:

    public void Configure(IApplicationBuilder app)
    {
        app.UseIISPlatformHandler();
        app.UseRequestLocalization(new RequestCulture(new CultureInfo("es")));
        app.Run(async (context) =>
        {
            context.Response.ContentType = "text/html";
            await context.Response.WriteAsync(HtmlEncoder.Default.HtmlEncode(1000.5f.ToString("C")));
        });
    }

Result:

1.000,50 €

Also, more to the point of the original question:

    public void Configure(IApplicationBuilder app)
    {
        app.UseIISPlatformHandler();

        var modified = new CultureInfo(CultureInfo.DefaultThreadCurrentCulture.DisplayName);
        modified.NumberFormat.CurrencySymbol = "RM";
        modified.NumberFormat.CurrencyDecimalDigits = 2;
        modified.NumberFormat.CurrencyDecimalSeparator = ".";
        modified.NumberFormat.CurrencyGroupSeparator = ",";

        app.UseRequestLocalization(new RequestCulture(modified));
        app.Run(async (context) =>
        {
            context.Response.ContentType = "text/html";
            await context.Response.WriteAsync(HtmlEncoder.Default.HtmlEncode(1000.5f.ToString("C")));
        });
    }

Result:

RM1,000.50

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