无法使用Windows.Web.Http将文件从UWP应用发送到WebAPI Web服务控制器

本文介绍了无法使用Windows.Web.Http将文件从UWP应用发送到WebAPI Web服务控制器的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我在Windows 10 UWP应用中具有以下代码，用于将文件发送到WebAPI Web服务.

I have the following code on my Windows 10 UWP app to send a file to a WebAPI web service.

public async void Upload_FileAsync(string WebServiceURL, string FilePathToUpload) { //prepare HttpStreamContent IStorageFile storageFile = await StorageFile.GetFileFromPathAsync(FilePathToUpload); IRandomAccessStream stream=await storageFile.OpenAsync(FileAccessMode.Read); Windows.Web.Http.HttpStreamContent streamContent = new Windows.Web.Http.HttpStreamContent(stream); //send request var myFilter = new Windows.Web.Http.Filters.HttpBaseProtocolFilter(); myFilter.AllowUI = false; var client = new Windows.Web.Http.HttpClient(myFilter); Windows.Web.Http.HttpResponseMessage result = await client.PostAsync(new Uri(WebServiceURL), streamContent); string stringReadResult = await result.Content.ReadAsStringAsync(); }

这是我要在Web服务中尝试使用的控制器，但 myFileBytes 始终具有空值.我尝试添加具有相同结果的 [FromBody] 和 [FromForm] .

Here is the controller that I am trying to use in the web service but myFileBytes always has a null value. I tried adding [FromBody] and [FromForm] with the same result.

public class MyController : Controller { [HttpPost] public async Task<bool> Upload_File(byte[] myFileBytes) { //... } }

我还尝试使用 IFormFile 获得相同的结果.

I also tried using IFormFile with the same result.

public class MyController : Controller { [HttpPost] public async Task<bool> Upload_File(IFormFile myFileBytes) { //... } }

如何将文件获取到Web服务中的控制器?请帮忙！

How can I get the file to the controller in the web service? Please help!

推荐答案

承诺！我用的是什么:

• asp核心
• uwp

在asp核心中，我有一个看起来像这样的控制器:

in the asp core i have a controller that looks like:

[Route("api/[controller]")] public class ValuesController : Controller { [HttpPost("Bytes")] public void Bytes([FromBody]byte[] value) { } [HttpPost("Form")] public Task<IActionResult> Form([FromForm]List<IFormFile> files) { // see docs.microsoft/en-us/aspnet/core/mvc/models/file-uploads return Task.FromResult<IActionResult>(Ok()); } }

在UWP中使用它来发送图像:

in UWP use this to send the image:

var file =等待StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appx:///Assets/LockScreenLogo.png"));

var file = await StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appx:///Assets/LockScreenLogo.png"));

try { var http = new HttpClient(); var formContent = new HttpMultipartFormDataContent(); var fileContent = new HttpStreamContent(await file.OpenReadAsync()); fileContent.Headers.ContentType = new Windows.Web.Http.Headers.HttpMediaTypeHeaderValue("image/png"); formContent.Add(fileContent, "files", "lockscreenlogo.png"); var response = await http.PostAsync(new Uri("localhost:15924/api/values/Form"), formContent); response.EnsureSuccessStatusCode(); } catch(Exception ex) { }

formContent.Add(fileContent，"files"，"lockscreenlogo.png"); 很重要.使用此特定的替代

the formContent.Add(fileContent, "files", "lockscreenlogo.png"); is important. Use this specific override