这里提出了类似的问题： getting error while download the file in mvc2 但有一个答案并没有解决我的问题，我怀疑它解决了另一个人的问题......
这是我的问题： 我试图通过WebAPI公开pdf，xlsx，tif或任何类型的文档，这是我目前在API上的代码：
public HttpResponseMessage Download(string documentId, string contactId)
{
var path = DocumentSource + "\\";
var document = DocumentDomain.GetDocument(new Guid(contactId), new Guid(documentId));
if (ReferenceEquals(document, null) && ReferenceEquals(document.FileName, null))
{
return new HttpResponseMessage(HttpStatusCode.NotFound);
}
else
{
try
{
MemoryStream responseStream = new MemoryStream();
Stream fileStream = new FileStream(Path.Combine(path,
document.PortfolioId == null ? "" : document.PortfolioId.ToString(), document.FileName), FileMode.Open);
bool fullContent = true;
if (this.Request.Headers.Range != null)
{
fullContent = false;
RangeItemHeaderValue range = this.Request.Headers.Range.Ranges.First();
// From specified, so seek to the requested position.
if (range.From != null)
{
fileStream.Seek(range.From.Value, SeekOrigin.Begin);
// In this case, actually the complete file will be returned.
if (range.From == 0 && (range.To == null || range.To >= fileStream.Length))
{
fileStream.CopyTo(responseStream);
fullContent = true;
}
}
if (range.To != null)
{
// 10-20, return the range.
if (range.From != null)
{
long? rangeLength = range.To - range.From;
int length = (int)Math.Min(rangeLength.Value, fileStream.Length - range.From.Value);
byte[] buffer = new byte[length];
fileStream.Read(buffer, 0, length);
responseStream.Write(buffer, 0, length);
}
// -20, return the bytes from beginning to the specified value.
else
{
int length = (int)Math.Min(range.To.Value, fileStream.Length);
byte[] buffer = new byte[length];
fileStream.Read(buffer, 0, length);
responseStream.Write(buffer, 0, length);
}
}
// No Range.To
else
{
// 10-, return from the specified value to the end of file.
if (range.From != null)
{
if (range.From < fileStream.Length)
{
int length = (int)(fileStream.Length - range.From.Value);
byte[] buffer = new byte[length];
fileStream.Read(buffer, 0, length);
responseStream.Write(buffer, 0, length);
}
}
}
}
// No Range header. Return the complete file.
else
{
fileStream.CopyTo(responseStream);
}
fileStream.Close();
responseStream.Position = 0;
HttpResponseMessage response = new HttpResponseMessage();
response.StatusCode = fullContent ? HttpStatusCode.OK : HttpStatusCode.PartialContent;
response.Content = new StreamContent(responseStream);
return response;
}
catch (IOException)
{
throw new HttpResponseException( HttpStatusCode.InternalServerError);
}
}
}
然后我有一个单独的MVC应用程序，我在控制器中有以下代码，它试图下载指定的文件：
public ActionResult DownloadDocument(string documentId, string documentName)
{
var currentMember = Members.GetCurrentMember();
if (currentMember != null)
{
var contactId = currentMember.GetProperty("contactID").Value.ToString();
try
{
HttpWebRequest req = (HttpWebRequest)WebRequest.Create(ConfigurationManager.AppSettings["APIBaseUrl"] + "/api/document/downloadExcel?documentId=" + documentId + "&contactId=" + contactId);
//req.Method = "GET";
var response = (HttpWebResponse)req.GetResponse();
byte[] data;
using (Stream s = response.GetResponseStream())
{
data = StreamToByteArray(s);
}
var mimeType = System.Web.MimeMapping.GetMimeMapping(documentName);
Response.AppendHeader("Content-Disposition", "inline; filename=" + documentName);
return File(data, mimeType);
}
catch (Exception ex)
{
return Json(new { Message = ex.ToString() });
}
}
return null;
}
以下是我得到的错误，我很肯定它与建议的JsonRequestBehaviour无关，因为我没有从API返回json：
此请求已被阻止，因为敏感信息可能是
当在GET请求中使用它时向第三方网站公开。 要允许GET请求，请将JsonRequestBehavior设置为AllowGet。堆栈追踪：
[InvalidOperationException: This request has been blocked because sensitive information could be disclosed to third party web sites when这用于GET请求。要允许GET请求，请设置 JsonRequestBehavior to AllowGet。] System.Web.Mvc.JsonResult.ExecuteResult（ControllerContext context） +292 System.Web.Mvc.ControllerActionInvoker.InvokeActionResult（ControllerContext controllerContext，ActionResult actionResult）+39
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive（IList的1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +1161 filters，Int32 filterIndex，ResultExecutingContext preContext， ControllerContext controllerContext，ActionResult actionResult）+529
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive（IList的1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +5291 filters，Int32 filterIndex，ResultExecutingContext preContext， ControllerContext controllerContext，ActionResult actionResult）+529
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive（IList1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +5291个过滤器，ActionResult actionResult）+106
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList
System.Web.Mvc.Async＆LT;＆GT; c__DisplayClass2b.b__1c（） +321 System.Web.Mvc.Async。＆lt;＆gt; c__DisplayClass21.b__1e（IAsyncResult） asyncResult）+185
System.Web.Mvc.Async.WrappedAsyncResult1.CallEndDelegate(IAsyncResult asyncResult) +421.End（）+133
System.Web.Mvc.Async.WrappedAsyncResultBase
System.Web.Mvc.Async.AsyncResultWrapper.End（IAsyncResult asyncResult， 对象标签）+56
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction（IAsyncResult的 asyncResult）+40
System.Web.Mvc.Controller.b__1d（IAsyncResult的 asyncResult，ExecuteCoreState innerState）+34
System.Web.Mvc.Async.WrappedAsyncVoid1.CallEndDelegate(IAsyncResult asyncResult) +701.End（）+133
System.Web.Mvc.Async.WrappedAsyncResultBase
System.Web.Mvc.Async.AsyncResultWrapper.End（IAsyncResult asyncResult， 对象标签）+56
System.Web.Mvc.Async.AsyncResultWrapper.End（IAsyncResult asyncResult， 对象标签）+37
System.Web.Mvc.Controller.EndExecuteCore（IAsyncResult asyncResult）+44 System.Web.Mvc.Controller.b__15（IAsyncResult的 asyncResult，控制器控制器）+39
System.Web.Mvc.Async.WrappedAsyncVoid1.CallEndDelegate(IAsyncResult asyncResult) +621.End（）+133
System.Web.Mvc.Async.WrappedAsyncResultBase
System.Web.Mvc.Async.AsyncResultWrapper.End（IAsyncResult asyncResult， 对象标签）+56
System.Web.Mvc.Async.AsyncResultWrapper.End（IAsyncResult asyncResult， 对象标签）+37 System.Web.Mvc.Controller.EndExecute（IAsyncResult asyncResult）+39
System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute（IAsyncResult的 asyncResult）+39
System.Web.Mvc.MvcHandler.b__5（IAsyncResult的 asyncResult，ProcessRequestState innerState）+39
System.Web.Mvc.Async.WrappedAsyncVoid1.CallEndDelegate(IAsyncResult asyncResult) +701.End（）+133
System.Web.Mvc.Async.WrappedAsyncResultBase
System.Web.Mvc.Async.AsyncResultWrapper.End（IAsyncResult asyncResult， 对象标签）+56
System.Web.Mvc.Async.AsyncResultWrapper.End（IAsyncResult asyncResult， 对象标签）+37
System.Web.Mvc.MvcHandler.EndProcessRequest（IAsyncResult asyncResult） +40 System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest（IAsyncResult） 结果）+38
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute（） +9765121 System.Web.HttpApplication.ExecuteStep（IExecutionStep step，Boolean＆amp; completedSynchronously）+155
答案 0 :(得分：0)
您正在id行动中在MVC应用程序的try catch块的catch部分返回Json。这可能就是你收到错误的原因。
尝试
DownloadDocument