如何创建用于加密webapi响应的自定义中间件？

using Microsoft.AspNetCore.Http;
using System;
using System.IO;
using System.Text;
using System.Threading.Tasks;

public class EncryptionMiddleware
{
    private readonly RequestDelegate _next;
    private readonly IEncryptionService _encryptionService;

    public EncryptionMiddleware(RequestDelegate next, IEncryptionService encryptionService)
    {
        _next = next;
        _encryptionService = encryptionService;
    }

    public async Task Invoke(HttpContext context)
    {
        var originalBodyStream = context.Response.Body;

        try
        {
            using (var responseBody = new MemoryStream())
            {
                context.Response.Body = responseBody;

                await _next(context);

                // Encrypt the response body
                responseBody.Seek(0, SeekOrigin.Begin);
                var responseBodyText = await new StreamReader(responseBody).ReadToEndAsync();
                var encryptedBodyText = _encryptionService.Encrypt(responseBodyText);

                // Update the response body with the encrypted content
                context.Response.Body = originalBodyStream;
                await context.Response.WriteAsync(encryptedBodyText, Encoding.UTF8);
            }
        }
        finally
        {
            context.Response.Body = originalBodyStream;
        }
    }
}

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
    // ...

    app.UseMiddleware<EncryptionMiddleware>();

    // ...
}