.netcore3.1 多次获取请求body报 System.ObjectDisposedException: Cannot access a disposed object. Object name: 'FileBufferingReadStream'.

　　开发中遇到 Cannot access a disposed object错误，大多数是多次读取请求Body流造成的，需要换一种获取请求Body流方法，不能使用StreamRreader方式，使用Body.CopyTo(ms)方法

• • 　配置可以同步请求读取流数据

 public void ConfigureServices(IServiceCollection services)
        {
  //配置可以同步请求读取流数据
            services.Configure<KestrelServerOptions>(x => x.AllowSynchronousIO = true)
                .Configure<IISServerOptions>(x => x.AllowSynchronousIO = true);

• • 在Startup配置中添加EnableBuffering

　　

public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {

          app.Use(next => context =>
            {
                context.Request.EnableBuffering();
                return next(context);
            });    

• • 在过滤器中，获取Post请求Body的Context使用下面方式获取　　　　　

   public override async Task OnResultExecutionAsync(ResultExecutingContext context, ResultExecutionDelegate next)
        {
  　　　　　　　　　　 context.HttpContext.Request.EnableBuffering();
                    context.HttpContext.Request.Body.Position = 0;
                    string bodyStr = string.Empty;
                    //using (var reader = new StreamReader(context.HttpContext.Request.Body, Encoding.UTF8))
                    //{
                    // var bodyRead = reader.ReadToEndAsync();
                    // bodyStr = bodyRead.Result;  //把body赋值给bodyStr
                    // needKey = JsonConvert.DeserializeAnonymousType
　　　　　　　　　　　　//(bodyRead.Result, new Dictionary<string, object>())[dependencySource].ToString();
                    //}
                    using (var ms = new MemoryStream())
                    {
                        context.HttpContext.Request.Body.CopyTo(ms);
                        var b = ms.ToArray();
                        bodyStr = Encoding.UTF8.GetString(b); //把body赋值给bodyStr
                        var  dicObj= JsonConvert.DeserializeAnonymousType(bodyStr, new Dictionary<string, object>());
                    }