c#之尝试使用 HttpClient 上传文件时来自 Web Api 的 RequestEntityTooLarge 响应_编程设计

我正在尝试创建一个 Web 服务以使用 Asp.Net Web Api 通过 Post 上传文件。这些分别是 Client 和 Web Api 的实现:

客户:

using (var client = new HttpClient()) { 
    client.BaseAddress = new Uri("https://127.0.0.1:44444/"); 
    using (var content = 
       new MultipartFormDataContent("Upload----" + DateTime.Now.ToString(CultureInfo.InvariantCulture))) { 
       content.Add(new ByteArrayContent(File.ReadAllBytes(filepath))); 
       content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream"); 
       var response = await client.PostAsync("api/Synchronization", content); 
 
       if (response.IsSuccessStatusCode) 
           eventLog1.WriteEntry("Synchronization has been successful", EventLogEntryType.Information); 
       else  
           eventLog1.WriteEntry(response.StatusCode + ":" + response.ReasonPhrase, EventLogEntryType.Error); 
 
      } 
}

服务器:

public class SynchronizationController : ApiController { 
 
    public HttpResponseMessage SynchronizeCsv() { 
        var task = this.Request.Content.ReadAsStreamAsync(); 
        task.Wait(); 
        Stream requestStream = task.Result; 
 
        try { 
            Stream fileStream = File.Create(HttpContext.Current.Server.MapPath(path)); 
            requestStream.CopyTo(fileStream); 
            fileStream.Close(); 
            requestStream.Close(); 
        } 
        catch (IOException) { 
            return Request.CreateErrorResponse(HttpStatusCode.InternalServerError, "A generic error occured. Please try again later."); 
        } 
 
        HttpResponseMessage response = new HttpResponseMessage(); 
        response.StatusCode = HttpStatusCode.Created; 
        return response; 
    } 
}

网络配置:

<system.web> 
    <compilation debug="true" targetFramework="4.5" /> 
    <httpRuntime targetFramework="4.5" maxRequestLength="2097152" /> 
  </system.web> 
  <system.webServer> 
    <security> 
      <requestFiltering> 
        <requestLimits maxAllowedContentLength="2147483648" /> 
      </requestFiltering> 
    </security> 
    <handlers> 
      <remove name="ExtensionlessUrlHandler-Integrated-4.0" /> 
      <remove name="OPTIONSVerbHandler" /> 
      <remove name="TRACEVerbHandler" /> 
      <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="*" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" /> 
    </handlers> 
  </system.webServer>

我正在尝试上传一个 5Mb 的文件，每次尝试调用该服务时，我都会收到 413 Http 错误请求实体太大。如果文件很小(例如 40kb)，一切正常。

通过互联网查看我尝试对 web.config 进行一些修改，但似乎没有任何工作正常。我做错了什么？

请您参考如下方法:

我通过这个解决方案解决了这个问题:http://www.smartdigitizers.com/net-development-tips/iis-7-how-to-resolve-error-https-413-request-entity-too-large/

启动“Internet 信息服务 (IIS) 管理器”
选择您在其下托管网络应用程序的网站。
在功能部分，双击“配置编辑器”
在“部分”下选择:system.webServer 然后是 serverRuntime
将“uploadReadAheadSize”部分修改为 20MB(以字节为单位的值)
点击应用