如何为多部分/表单数据设置Web API控制器
我正在尝试解决这个问题。我的代码没有得到任何有用的错误消息,因此我使用了其他东西来生成东西。错误消息后,我已附加了该代码。我已经找到了有关它的教程,但是我不知道如何使用现有的方法来实现它。这是我目前拥有的:
public async Task<object> PostFile() {
if (!Request.Content.IsMimeMultipartContent())
throw new Exception();
var provider = new MultipartMemoryStreamProvider();
var result = new { file = new List<object>() };
var item = new File();
item.CompanyName = HttpContext.Current.Request.Form["companyName"];
item.FileDate = HttpContext.Current.Request.Form["fileDate"];
item.FileLocation = HttpContext.Current.Request.Form["fileLocation"];
item.FilePlant = HttpContext.Current.Request.Form["filePlant"];
item.FileTerm = HttpContext.Current.Request.Form["fileTerm"];
item.FileType = HttpContext.Current.Request.Form["fileType"];
var manager = new UserManager<ApplicationUser>(new UserStore<ApplicationUser>(new ApplicationDbContext()));
var user = manager.FindById(User.Identity.GetUserId());
item.FileUploadedBy = user.Name;
item.FileUploadDate = DateTime.Now;
await Request.Content.ReadAsMultipartAsync(provider)
.ContinueWith(async (a) =>
{
foreach (var file in provider.Contents)
{
if (file.Headers.ContentLength > 1000)
{
var filename = file.Headers.ContentDisposition.FileName.Trim('\"');
var contentType = file.Headers.ContentType.ToString();
await file.ReadAsByteArrayAsync().ContinueWith(b => { item.FilePdf = b.Result; });
}
}
}).Unwrap();
db.Files.Add(item);
db.SaveChanges();
return result;
}
错误:
对象{消息:此资源不支持请求实体的媒体类型’multipart / form-
data’。”,异常消息:“没有MediaTypeFormatter可用于读取媒体类型为’multipart / form-
data’的对象内容。“,exceptionType:“
System.Net.Http.UnsupportedMediaTypeException”,stackTrace:“在System.Net.Http.HttpContentExtensions.ReadAs…atterLogger,CancellationToken取消令牌)”}
exceptionMessage:“没有MediaTypeFormatter可用于读取类型为’ ”。ExceptionType:“
System.Net.Http.UnsupportedMediaTypeException”消息:“此资源不支持请求实体的媒体类型“ multipart
/ form-data”。”堆栈跟踪: ”在System.Net.Http.HttpContentExtensions.ReadAsAsync
[T](HttpContent内容,类型,IEnumerable
1 formatters, IFormatterLogger
formatterLogger, CancellationToken cancellationToken) ↵ at
System.Net.Http.HttpContentExtensions.ReadAsAsync(HttpContent content, Type
type, IEnumerable1个格式化程序,IFormatterLogger
formatterLogger,CancellationToken取消Token)
用于生成错误消息的代码:
[HttpPost] public string UploadFile(HttpPostedFileBase file)
{
if (file.ContentLength > 0)
{
var fileName = Path.GetFileName(file.FileName);
var path = Path.Combine(HttpContext.Current.Server.MapPath("~/uploads"), fileName);
file.SaveAs(path);
}
return "/uploads/" + file.FileName;
}
类:
public class File{
public int FileId { get; set; }
public string FileType { get; set; }
public string FileDate { get; set; }
public byte[] FilePdf { get; set; }
public string FileLocation { get; set; }
public string FilePlant { get; set; }
public string FileTerm { get; set; }
public DateTime? FileUploadDate { get; set; }
public string FileUploadedBy { get; set; }
public string CompanyName { get; set; }
public virtual ApplicationUser User { get; set; }
}
回答:
我通常只在 参数。在处理
时, 尝试检查 属性是否包含传入文件: *
[HttpPost]public string UploadFile()
{
var file = HttpContext.Current.Request.Files.Count > 0 ?
HttpContext.Current.Request.Files[0] : null;
if (file != null && file.ContentLength > 0)
{
var fileName = Path.GetFileName(file.FileName);
var path = Path.Combine(
HttpContext.Current.Server.MapPath("~/uploads"),
fileName
);
file.SaveAs(path);
}
return file != null ? "/uploads/" + file.FileName : null;
}
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