无法从 C# Rest 服务获取 WebClient.UploadFile

Question

我目前正在尝试将一些 aspx 页面迁移到 C# Rest 服务中。 我不能改变调用者，只能改变被调用的服务。

我是这样称呼的：

var myWebClient = new WebClient();
// here I'm dealing with cookie but not sure it is worth explaining how I pass it cause it isn't the problem
var response = myWebClient.UploadFile(sURL, fileFulName); // fileFulName is the path of my local file

在 aspx 中，文件可以这样获取：

HttpPostedFile file = Request.Files[0];

首先我尝试了同样的代码：

var file = HttpContext.Current.Request.Files[0];

这会引发我可以通过将其添加到 web.config（appSettings 部分）来管理的异常：

<add key="wcf:serviceHostingEnvironment:useClassicReadEntityBodyMode" value="true" />

但是现在，它没有抛出异常，而是一个空数组。 这是我的端点方法：

[OperationContract]
 [WebInvoke(
        Method = "POST",
        BodyStyle = WebMessageBodyStyle.Bare,
        ResponseFormat = WebMessageFormat.Xml,
        UriTemplate = "/upload?myParam={myGetParam}]
void Upload(Stream fileStream, string myGetParam);

我不知道如何让它工作。我尝试使用字节数组作为输入，但响应是 400 Bad Request。然后我尝试查看 fileStream 中的内容，但它不包含我的文件，只有几个字符。

我不知道如何获取上传的文件。

Answer 1

以下是创建可将文件上传到 .NET 核心 REST API 服务的路由的方法：

[HttpPost]
[Route("api/upload")]
public async Task<IActionResult> Post(List<IFormFile> files)
{
    foreach (var formFile in files)
    {
        if (formFile.Length > 0)
        {
            using (var reader = new StreamReader(formFile.OpenReadStream()))
            {
                 // do something with the file content.
            }
        }
    }

    return Ok();
}

Answer 2

你可以查看我的上传文件功能的代码：

public void UploadFile(string fileName, Stream fileContents)

        {

            byte[] buffer = new byte[10000];

            int bytesRead, totalBytesRead = 0;

            do

            {

                bytesRead = fileContents.Read(buffer, 0, buffer.Length);

                totalBytesRead += bytesRead;

            } while (bytesRead > 0);

            Console.WriteLine("Service: Received file {0} with {1} bytes", fileName, totalBytesRead);

        }

 

The service contract:

 

   [ServiceContract] 

    public interface IReceiveData 

    { 

        [WebInvoke(UriTemplate = "UploadFile/{fileName}")] 

        void UploadFile(string fileName, Stream fileContents); 

    }

The main function:

 

static void Main(string[] args) 

        { 

            string baseAddress = "http://" + Environment.MachineName + ":8000/Service"; 

            ServiceHost host = new ServiceHost(typeof(RawDataService), new Uri(baseAddress)); 

            host.AddServiceEndpoint(typeof(IReceiveData), new WebHttpBinding(), "").Behaviors.Add(new WebHttpBehavior()); 

            host.Open(); 

            Console.WriteLine("Host opened"); 

  

            HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(baseAddress + "/UploadFile/Test.txt"); 

            req.Method = "POST"; 

            req.ContentType = "text/plain"; 

            Stream reqStream = req.GetRequestStream(); 

            byte[] fileToSend = new byte[12345]; 

            for (int i = 0; i < fileToSend.Length; i++) 

            { 

                fileToSend[i] = (byte)('a' + (i % 26)); 

            } 

            reqStream.Write(fileToSend, 0, fileToSend.Length); 

            reqStream.Close(); 

            HttpWebResponse resp = (HttpWebResponse)req.GetResponse(); 

            Console.WriteLine("Client: Receive Response HTTP/{0} {1} {2}", resp.ProtocolVersion, (int)resp.StatusCode, resp.StatusDescription); 

            host.Close(); 

  

        } 

结果如下：

更多信息可以参考这个链接：

https://docs.microsoft.com/en-us/dotnet/framework/wcf/feature-details/create-a-service-arbitrary-data-using-wcf