在 ASP.NET Core Web Api 中发布流

问题描述：

你好，Stack Overflow 可爱的人们.从昨天开始，我遇到了问题，从那时起我就一直在浏览 SO.我有一个 UWP 客户端和 ASP.NET Core Web Api.我只是想向我的 web api 发送一个流，但这确实比我想象的要困难得多.

Hello lovely people of Stack Overflow. Since yesterday I have a problem and I have been browsing SO since then. I have a UWP Client and ASP.NET Core Web Api. I just want to send a stream to my web api but indeed this occurred to be harder task than i thought.

我有一个只有一个属性的类.Stream 属性，如下所示:

I have a class which I have only one property. The Stream property as you can see below:

public class UploadData
{
    public Stream InputData { get; set; }
}

然后这是我的 Web Api 代码:

Then Here is my code from my Web Api:

// POST api/values
[HttpPost]
public string Post(UploadData data)
{
    return "test";
}

我试图从 body 中读取流，但结果是一样的.我可以点击 post 方法 UploadData is not null 但我的 InputData 总是 null.

I have tried to read the stream From body but the result is same. I can hit the post method UploadData is not null but my InputData is always null.

这是我的 UWP 发布请求代码.

Here is my UWP's code for post request.

private async void PostStreamButton_OnClick(object sender, RoutedEventArgs e)
{
    using (var client = new HttpClient())
    {
        var dummyBuffer = new UnicodeEncoding().GetBytes("this is dummy stream");
        var dummyStream = new MemoryStream(dummyBuffer).AsRandomAccessStream().AsStream();

        var requestContent = new MultipartFormDataContent();
        var inputData = new StreamContent(dummyStream);
        inputData.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
        requestContent.Headers.ContentType = new MediaTypeHeaderValue("application/json");

        requestContent.Add(inputData, "inputData");

        HttpResponseMessage response = client.PostAsync("url", inputData).Result;
    }
}

我尝试了各种内容类型，但它们似乎都不起作用，我不知道为什么.我真的很感激所有的帮助.

I have tried various of content types which none of them seems to work and I have no idea why. I would really appreciate all the help.

答

在客户端发送流内容而不是整个模型.

On client side send the stream content not the whole model.

private async void PostStreamButton_OnClick(object sender, RoutedEventArgs e) {
    using (var client = new HttpClient()) {
        var dummyBuffer = new UnicodeEncoding().GetBytes("this is dummy stream");
        var dummyStream = new MemoryStream(dummyBuffer).AsRandomAccessStream().AsStream();

        var inputData = new StreamContent(dummyStream);

        var response = await client.PostAsync("url", inputData);
    }
}

注意:不要将 .Result 阻塞调用与异步调用混用.这些往往会导致死锁.

NOTE: Do not mix .Result blocking calls with async calls. Those tend to cause deadlocks.

在服务器更新操作

// POST api/values
[HttpPost]
public IActionResult Post() {
    var stream = Request.Body;
    return Ok("test");
}

在 ASP.NET Core Web Api 中发布流

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