Dotnet core decimal model binder problem fix

InvariantDecimalModelBinder.cs

using System;
using System.Globalization;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc.ModelBinding;
using Microsoft.AspNetCore.Mvc.ModelBinding.Binders;

namespace BA.ECommerce.Client.Utility
{
    public class InvariantDecimalModelBinderProvider : IModelBinderProvider
    {
        public IModelBinder GetBinder(ModelBinderProviderContext context)
        {
            if (context == null) throw new ArgumentNullException(nameof(context));

            if (!context.Metadata.IsComplexType && (context.Metadata.ModelType == typeof(decimal) || context.Metadata.ModelType == typeof(decimal?)))
            {
                return new InvariantDecimalModelBinder(context.Metadata.ModelType);
            }

            return null;
        }
    }

    public class InvariantDecimalModelBinder : IModelBinder
    {
        private readonly SimpleTypeModelBinder _baseBinder;

        public InvariantDecimalModelBinder(Type modelType)
        {
            _baseBinder = new SimpleTypeModelBinder(modelType);
        }

        public Task BindModelAsync(ModelBindingContext bindingContext)
        {
            if (bindingContext == null) throw new ArgumentNullException(nameof(bindingContext));

            var valueProviderResult = bindingContext.ValueProvider.GetValue(bindingContext.ModelName);

            if (valueProviderResult != ValueProviderResult.None)
            {
                bindingContext.ModelState.SetModelValue(bindingContext.ModelName, valueProviderResult);

                var valueAsString = valueProviderResult.FirstValue;
                decimal result;

                // Use invariant culture
                if (decimal.TryParse(valueAsString, NumberStyles.AllowDecimalPoint | NumberStyles.AllowLeadingSign, CultureInfo.InvariantCulture, out result))
                {
                    bindingContext.Result = ModelBindingResult.Success(result);
                    return Task.CompletedTask;
                }
            }

            // If we haven't handled it, then we'll let the base SimpleTypeModelBinder handle it
            return _baseBinder.BindModelAsync(bindingContext);
        }
    }
}

Startup

            services.AddMvc(options =>
            {
                options.ModelBinderProviders.Insert(0, new InvariantDecimalModelBinderProvider());
            });