Code required to create a model binder that sets or empty or no strings to empty string during binding

NoNullString.cs

//In Startup.cs file
services.AddMvc(config =>
    config.ModelBinderProviders.Insert(0, new NoNullStringModelBinderProvider())    
);

//model binder provider
public class NoNullStringModelBinderProvider : IModelBinderProvider
{
    public IModelBinder GetBinder(ModelBinderProviderContext context)
    {
        if (context == null) throw new ArgumentNullException(nameof(context));

        if (!context.Metadata.IsComplexType)
        {
            var propName = context.Metadata.PropertyName;
            var propInfo = context.Metadata.ContainerType.GetProperty(propName);

            if (propInfo.PropertyType == typeof(string))
                return new NoNullStringModelBinder(context.Metadata.ModelType);
        }

        return null;
    }
}

//model binder
public class NoNullStringModelBinder : IModelBinder
{
    private SimpleTypeModelBinder _baseBinder;

    public NoNullStringModelBinder(Type type)
    {
        _baseBinder = new SimpleTypeModelBinder(type);
    }

    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);
            object result = null;
            var valueAsString = valueProviderResult.FirstValue;
            var success = false;
            if (string.IsNullOrEmpty(valueAsString))
            {
                success = true;
                result = string.Empty;
            }
            if (success)
            {
                bindingContext.Result = ModelBindingResult.Success(result);
                return Task.CompletedTask;
            }
        }

        return _baseBinder.BindModelAsync(bindingContext);
    }
}