Question

我的Windows 10 UWP应用程序上有以下代码，用于将文件发送到WebAPI Web服务。

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();
}

以下是我尝试在Web服务中使用的控制器，但myFileBytes始终具有空值。我尝试使用相同的结果添加[FromBody]和[FromForm]。

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

我也尝试使用IFormFile，结果相同。

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

如何将文件传送到Web服务中的控制器？请帮忙！

Answer 1

如同承诺的那样！我用过的东西：

asp.net core
UWP

在asp.net核心中，我有一个看起来像的控制器：

[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());
        }
    }

UWP中的

使用它来发送图像：

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。使用此特定覆盖

无法使用Windows.Web.Http从UWP应用程序发送文件到WebAPI Web服务控制器

1 个答案: