该模型：
public class UploadFileModel
{
public int Id { get; set; }
public string FileName { get; set; }
public HttpPostedFileBase File { get; set; }
}
控制器：
public void Post(UploadFileModel model)
{
// never arrives...
}
我收到了一个错误
“No MediaTypeFormatter is available to read an object of type ‘UploadFileModel’ from content with media type ‘multipart/form-data’.”
有没有办法解决？
解决方法
这不容易. Web API中的模型绑定与MVC根本不同,您必须编写一个MediaTypeFormatter,它将文件流读入您的模型,并另外绑定可能相当具有挑战性的原语.
最简单的解决方案是使用某种类型的MultipartStreamProvider从请求中获取文件流,并使用该提供程序使用FormData名称值集合的其他参数
示例 – http://www.asp.net/web-api/overview/working-with-http/sending-html-form-data,-part-2：
public async Task<HttpResponseMessage> PostFormData()
{
if (!Request.Content.IsMimeMultipartContent())
{
throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType);
}
string root = HttpContext.Current.Server.MapPath("~/App_Data");
var provider = new MultipartFormDataStreamProvider(root);
try
{
await Request.Content.ReadAsMultipartAsync(provider);
// Show all the key-value pairs.
foreach (var key in provider.FormData.AllKeys)
{
foreach (var val in provider.FormData.GetValues(key))
{
Trace.WriteLine(string.Format("{0}: {1}",key,val));
}
}
return Request.CreateResponse(HttpStatusCode.OK);
}
catch (System.Exception e)
{
return Request.CreateErrorResponse(HttpStatusCode.InternalServerError,e);
}
}