C# trim string binder (MVC)

ConfigureMvcOptions.cs

using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Infrastructure;
using Microsoft.Extensions.Options;

public class ConfigureMvcOptions : IConfigureOptions<MvcOptions>
{
    private readonly IHttpRequestStreamReaderFactory readerFactory;

    public ConfigureMvcOptions(IHttpRequestStreamReaderFactory readerFactory)
    {
        this.readerFactory = readerFactory;
    }

    public void Configure(MvcOptions options)
    {
        options.ModelBinderProviders.Insert(0, new TrimStringsBinderProvider(options.InputFormatters, this.readerFactory));
    }
}

Startup.cs

// ...

public class Startup
{
    // ...
    
    public void ConfigureServices(IServiceCollection services)
    {    
        // ...
        
        services.AddSingleton<IConfigureOptions<MvcOptions>, ConfigureMvcOptions>();

        // ...
    }
    
    // ...
}

TrimStringsBinder.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Threading.Tasks;

using Microsoft.AspNetCore.Mvc.Formatters;
using Microsoft.AspNetCore.Mvc.Infrastructure;
using Microsoft.AspNetCore.Mvc.ModelBinding;
using Microsoft.AspNetCore.Mvc.ModelBinding.Binders;

public class TrimStringsBinder : IModelBinder
{
    private readonly BodyModelBinder bodyModelBinder;

    public TrimStringsBinder(IList<IInputFormatter> formatters, IHttpRequestStreamReaderFactory readerFactory)
    {
        this.bodyModelBinder = new BodyModelBinder(formatters, readerFactory);
    }

    public async Task BindModelAsync(ModelBindingContext bindingContext)
    {
        await this.bodyModelBinder.BindModelAsync(bindingContext).ConfigureAwait(false);

        if (bindingContext.Result.IsModelSet && bindingContext.Result.Model != null)
        {
            object model = bindingContext.Result.Model;

            IEnumerable<PropertyInfo> stringProperties = model.GetType().GetProperties()
                .Where(info => info.PropertyType == typeof(string) && !info.GetCustomAttributes<DoNotTrimAttribute>().Any()).ToList();

            foreach (PropertyInfo stringProperty in stringProperties)
            {
                try
                {
                    string? value = (stringProperty.GetValue(model) as string)?.Trim();

                    stringProperty.SetValue(model, value);
                }
                catch (Exception)
                {
                    // swallow
                }
            }
        }
    }
}

TrimStringsBinderProvider.cs

using System.Collections.Generic;

using Microsoft.AspNetCore.Mvc.Formatters;
using Microsoft.AspNetCore.Mvc.Infrastructure;
using Microsoft.AspNetCore.Mvc.ModelBinding;
using Microsoft.AspNetCore.Mvc.ModelBinding.Binders;

public class TrimStringsBinderProvider : IModelBinderProvider
{
    private readonly BodyModelBinderProvider bodyModelBinderProvider;
    private readonly IList<IInputFormatter> formatters;
    private readonly IHttpRequestStreamReaderFactory readerFactory;

    public TrimStringsBinderProvider(IList<IInputFormatter> formatters, IHttpRequestStreamReaderFactory readerFactory)
    {
        this.formatters = formatters;
        this.readerFactory = readerFactory;
        this.bodyModelBinderProvider = new BodyModelBinderProvider(formatters, readerFactory);
    }

    public IModelBinder? GetBinder(ModelBinderProviderContext context)
    {
        IModelBinder? modelBinder = this.bodyModelBinderProvider.GetBinder(context);

        if (modelBinder != null)
        {
            modelBinder = new TrimStringsBinder(this.formatters, this.readerFactory);
        }

        return modelBinder;
    }
}