Empty HttpContext.Current.Request.Files in WCF Service

问题

I'm trying to upload files form a html5 page to a WCF Service but the Files object in the HttpContext.Current.Request is empty.

Any Idea?

my WCF Service:

[ServiceContract(Namespace = "")]
[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
public class FileUploader
{
    // test file uploader
    [OperationContract]
    [WebGet]
    public string UploadFile()
    {
        string fileName = "no file selected";

        HttpContext context = HttpContext.Current;
        if (context != null)
        {
            if (context.Request.Files.Count > 0)
            {
                fileName = context.Request.Files[0].FileName;
            }
        }

        return fileName;
    }
}

The calling javascript is:

function UploadFile() {

    FileUploader.UploadFile(HandleUploadResponse);
}

Thanks

来源：https://stackoverflow.com/questions/8065105/empty-httpcontext-current-request-files-in-wcf-service