server/aspnetapp/Helper/FileStreamingHelper.cs

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using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Http.Features;
using Microsoft.AspNetCore.Mvc.ModelBinding;
using Microsoft.AspNetCore.WebUtilities;
using Microsoft.Net.Http.Headers;
using System;
using System.Globalization;
using System.IO;
using System.Text;
using System.Threading.Tasks;

namespace aspnetapp.Helper
{
    public static class FileStreamingHelper
    {
        private static readonly FormOptions _defaultFormOptions = new FormOptions();

        public static async Task<FormValueProvider> StreamFiles(this HttpRequest request)
        {
            if (request == null)
            {
                throw new Exception("request is null");
            }
            if (!MultipartRequestHelper.IsMultipartContentType(request.ContentType))
            {
                throw new Exception($"Expected a multipart request, but got {request.ContentType}");
            }

            // Used to accumulate all the form url encoded key value pairs in the 
            // request.
            var formAccumulator = new KeyValueAccumulator();

            var boundary = MultipartRequestHelper.GetBoundary(
                MediaTypeHeaderValue.Parse(request.ContentType),
                _defaultFormOptions.MultipartBoundaryLengthLimit);
            var reader = new MultipartReader(boundary, request.Body);

            //用于读取Http请求中的第一个section数据
            var section = await reader.ReadNextSectionAsync().ConfigureAwait(false);
            while (section != null)
            {
                ContentDispositionHeaderValue contentDisposition;
                var hasContentDispositionHeader = ContentDispositionHeaderValue.TryParse(section.ContentDisposition, out contentDisposition);

                if (hasContentDispositionHeader)
                {
                    /*
                    用于处理表单键值数据的section
                    -----------------------------99614912995
                    Content - Disposition: form - data; name = "SOMENAME"

                    Formulaire de Quota
                    -----------------------------99614912995
                    */
                    if (MultipartRequestHelper.HasFormDataContentDisposition(contentDisposition))
                    {
                        // Content-Disposition: form-data; name="key"
                        //
                        // value