无法使用Windows.Web.Http将文件从UWP应用发送到WebAPI Web服务控制器 [英] Cannot get file sent from UWP app using Windows.Web.Http to WebAPI web service controller
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.net核心
- uwp
在asp.net核心中,我有一个看起来像这样的控制器:
in the asp.net 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 https://docs.microsoft.com/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("http://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
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