尝试接受具有大文件的模型时出现.netAPI错误

c#

c#-4.0

我有一个 API 方法，当一个大文件传递给它时，它会接收一个空模型参数。
我创建了一个测试客户端来测试这个端点。测试客户端和 API 都具有相同的模型，并且都使用 .NET 4.5：

public class FilingPostModel
    {
        public string Id { get; set; }
        public string TypeId { get; set; }
        public string FirstName { get; set; }
        public string MiddleName { get; set; }
        public string LastName { get; set; }
        public string Suffix { get; set; }
        public string Line1 { get; set; }
        public string Line2 { get; set; }
        public string City { get; set; }
        public string State { get; set; }
        public string PostalCode { get; set; }
        public string Country { get; set; }
        public string Email { get; set; }
        public string PhoneNumber { get; set; }
        public string Comment { get; set; }
        public string DateSubmitted { get; set; }
        public string Summary { get; set; }
        public List<FilePostModel> FileData { get; set; }
    }

    public class FilePostModel
    {
        public string FileId { get; set; }
        public string FileName { get; set; }
        public string ContentType { get; set; }
        public string FileContent { get; set; }
        public string DateSubmitted { get; set; }
        public string ClassificationId { get; set; }     
    }

测试客户端正在提交此模型：

City: "j"
Comment: null
Country: "United States"
Email: "test@test.tst"
FileData: Count = 1
TypeId: "f94e264a-c8b1-44aa-862f-e6f0f7565e19"
FirstName: "fname"
Id: null
LastName: "lname"
Line1: "testdrive 1"
Line2: null
MiddleName: null
PhoneNumber: "3748923798"
PostalCode: "12345"
State: "Pennsylvania"
Suffix: null
Summary: null

FileData 组件有一项：

FileContent: "xY+v6sC8RHQ19av2LpyFGu6si8isrn8YquwGRAalW/6Q..."
ClassificationId: null
ContentType: "text/plain"
FileName: "large.txt"

这是用于创建和发送 API 请求的测试客户端方法

public async Task<ActionResult> PostNewFiling(FilingPostModel model)
{
    Dictionary<string, string> req = new Dictionary<string, string>
        {
            {"grant_type", "password"},
            {"username", "some user name"},
            {"password", "some password"},
        };
    FilingApiPostModel postModel = new FilingApiPostModel(model);
    using (HttpClient client = new HttpClient())
    {
        client.Timeout = TimeSpan.FromMinutes(15);
        client.BaseAddress = new Uri(baseUrl);
        var resp = await client.PostAsync("Token", new FormUrlEncodedContent(req));
        if (resp.IsSuccessStatusCode)
        {
            TokenModel token = JsonConvert.DeserializeObject<TokenModel>(await resp.Content.ReadAsStringAsync());
            if (!String.IsNullOrEmpty(token.access_token))
            {
                foreach (HttpPostedFileBase file in model.Files)
                {
                    if (file != null)
                    {                                    
                        FilePostModel fmodel = new FilePostModel();
                        fmodel.FileName = file.FileName;
                        fmodel.ContentType = file.ContentType;
                        byte[] fileData = new byte[file.ContentLength];
                        await file.InputStream.ReadAsync(fileData, 0, file.ContentLength);
                        fmodel.FileContent = Convert.ToBase64String(fileData);
                        fmodel.ClassificationId = model.Classification1;
                        postModel.FileData.Add(fmodel);
                    }
                }
                
                client.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", token.access_token);
                var response = await client.PostAsJsonAsync("api/Filing/PostFiling", postModel);    
                var responseBody = await response.Content.ReadAsStringAsync();

                if (response.IsSuccessStatusCode)
                    return Json(new { responseBody });
                else
                    return Json(new { error = true, message = "Error Uploading", obj = responseBody });
            }
        }
        return Json(new { error = true, message = "Error Uploading" });
    }
}

这是接收此客户端请求的 API 方法：

public async Task<StatusModel> PostFiling(FilingPostModel model)

这是 web.config 中的 maxAllowedContentLength 设置：

<system.webServer>
    <security>
      <requestFiltering>
        <requestLimits maxAllowedContentLength="4294967295" />
      </requestFiltering>
    </security>
  </system.webServer>

API 模型始终null在此测试场景中。我收到两种类型的错误：

1. Newtonsoft.Json - 数组尺寸超出支持范围
2. Newtonsoft.Json - 解析值时遇到意外字符：x。路径 'FileData[0].Bytes'，第 1 行，位置 517

此测试文件的文件大小为 560 MB。我使用Dummy File Creator来创建它。以下是内容示例：

ůêÀ¼Dt5õ«ö.œ…Ȭ®ªìD¥[þ6hW åz·cʾYP¸‡>•;,–@Ó¶ÿm™­fø@ÃNÇIäÀ¿Y4~ëÆÃc¥EWÀ_÷õ9%«éÀG!WBÍ*G2P×æŸ7ú‚{ÓêRúÅîµMZSªšpt6ä”Òø˜H

我也尝试使用“fsutil file createnew”来创建一个测试文件，但收到类似的错误。

使用 256 MB 文件进行测试时，一切正常。

感谢您的帮助。