我正在构建一个 Android 应用程序，该应用程序具有用户可以为项目发布图像的表单。所以 post 数据是一个 int 字段和一个图像。
我使用 MvvmCross Network 插件发布并得到以下错误。我是初学者，我不知道我做错了什么：移动应用程序代码或 API 控制器代码？
error = {System.Net.WebException: The remote server returned an error: (500) Internal Server Error.
at System.Net.HttpWebRequest.CheckFinalStatus (System.Net.WebAsyncResult result) [0x00000] in <filename unknown>:0
at System.Net.HttpWebRequest.SetResponseData ...
这是移动应用程序代码：
这是选择图像代码：
protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
{
if ((requestCode == PickImageId) && (resultCode == Result.Ok) && (data != null))
{
_imgUri = data.Data;
_imgPath = GetPathToImage(_imgUri);
_contentType = ContentResolver.GetType(_imgUri);
}
}
然后点击提交按钮
private void btnSubmit_Click(object sender, EventArgs e)
{
MemoryStream stream = new MemoryStream();
ContentResolver.OpenInputStream(_imgUri).CopyTo(stream);
_vm.Submit(_imgPath, _contentType, stream);
}
这是提交功能：
public void Submit(string fileName, string contentType, MemoryStream stream) {
//Post data
int itemId = 1;
List<MvxMultiPartFormRestRequest.IStreamForUpload> streams = new List<MvxMultiPartFormRestRequest.IStreamForUpload>();
streams.Add(new MvxMultiPartFormRestRequest.MemoryStreamForUpload("userFile", fileName, contentType, stream));
var client = Mvx.Resolve<IMvxJsonRestClient>();
var r = new MvxMultiPartFormRestRequest("https://.../api/ItemUserImage");
r.FieldsToSend.Add("itemId", itemId.ToString());
r.StreamsToSend.AddRange(streams);
client.MakeRequestFor<MyResponse>(r, (result) =>
{
Mvx.Resolve<IUserInteraction>().Alert(result.Result.ResponseText, null, TitleInformation);
}, (error) =>
{
//I met error here
});
这是我的 API 控制器：
public class ItemUserImageController : ApiController
{
public async Task<HttpResponseMessage> PostFormData()
{
Response response = new Response();
response.ResponseCode = 1;
response.ResponseText = "step0-";
// Check if the request contains multipart/form-data.
if (!Request.Content.IsMimeMultipartContent())
{
response.ResponseText += "step1-";
throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType);
}
response.ResponseText += "step2-";
string root = HttpContext.Current.Server.MapPath("~/App_Data");
var provider = new MultipartFormDataStreamProvider(root);
response.ResponseText += "step3-";
try
{
// Read the form data.
await Request.Content.ReadAsMultipartAsync(provider);
response.ResponseText += "step4-";
foreach (var key in provider.FormData.AllKeys)
{
foreach (var val in provider.FormData.GetValues(key))
{
response.ResponseText += string.Format("{0}: {1}-", key, val);
}
}
response.ResponseText += "step5-";
// This illustrates how to get the file names.
foreach (MultipartFileData file in provider.FileData)
{
response.ResponseText += string.Format("{0} - Server file path: {1}-", file.Headers.ContentDisposition.FileName, file.LocalFileName);
}
return Request.CreateResponse(HttpStatusCode.OK, response);
}
catch (System.Exception e)
{
return Request.CreateErrorResponse(HttpStatusCode.InternalServerError, response.ResponseText ,e);
}
}
}
请帮忙。谢谢你。