ajax - 将图像数据从 Ajax 发布到 WebAPI

Question

我正在尝试使用我在此处找到的示例代码将图像数据传递给 Web API 方法 http://www.asp.net/web-api/overview/working-with-http/sending-html-form-data,-part-2我发现 MultipartFormDataStreamProvider.FileData 总是空的。为什么会这样？另外，这是正确的方法吗？有选择吗？我试图只传递一张图片。

召唤

var t = new FormData();
t.append('file-', file.id);
t.append('filename', file.name);
t.append('Size', file.size);

$.ajax({
    url: sf.getServiceRoot('mySite') + "upload/PostFormData",
    type: "POST",
    data: t,
    contentType: false,
    processData: false,
    beforeSend: sf.setModuleHeaders
}).done(function (response, status) {
    alert(response);
}).fail(function (xhr, result, status) {
    alert("error: " + result);
});

});

public async Task<HttpResponseMessage> PostFormData()
    {
        // Check if the request contains multipart/form-data.
        if (!Request.Content.IsMimeMultipartContent())
        {
            throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType);
        }

        string root = HttpContext.Current.Server.MapPath("~/App_Data");
        var provider = new MultipartFormDataStreamProvider(root);

        try
        {
            // Read the form data.
            await Request.Content.ReadAsMultipartAsync(provider);

            // This illustrates how to get the file names.
            foreach (MultipartFileData file in provider.FileData)
            {
                Trace.WriteLine(file.Headers.ContentDisposition.FileName);
                Trace.WriteLine("Server file path: " + file.LocalFileName);
            }
            return Request.CreateResponse(HttpStatusCode.OK);
        }
        catch (System.Exception e)
        {
            return Request.CreateErrorResponse(HttpStatusCode.InternalServerError, e);
        }
    }

Answer 1

通过表单发布时我可以正确获取文件数据，

如示例所示@ WebAPI upload error. Expected end of MIME multipart stream. MIME multipart message is not complete

祝你好运，