0
Windows 2008 R2 Server
IIS 7.5
ASP.Net 4.5.1
web.config <httpRuntime requestValidationMode="2.0" />
我有一個用於從查詢字符串，形式或Cookies集合返回一個整數ID的功能。它工作得很好，99％的時間，下面是正在使用的代碼：
Function get_id() as Integer
Const k_fld_name as String = "id"
Dim ok As Boolean
Dim id as Integer
Dim fld_val As String
Dim cookie as HttpCookie
Dim req As System.Web.HttpRequest
' Attempt to get ID ...
id = 0
fld_val = Nothing
' Get current request (if any) ...
' NOTE: https://msdn.microsoft.com/en-us/library/system.web.httpcontext.request(v=vs.110).aspx
' ASP.NET will throw an exception if you try to use this property when the HttpRequest object
' Is Not available. For example, this would be true in the Application_Start method of the Global.asax file,
' Or in a method that Is called from the Application_Start method. At that time no HTTP request
' has been created yet ...
Try
req = System.Web.HttpContext.Current.Request
Catch
req = Nothing
End Try
If (req Is Nothing) Then
Return id
End If
Try
' Check in querystring ...
fld_val = req.Unvalidated.QueryString(k_fld_name)
' If not found, check in form ...
If (String.IsNullOrEmpty(fld_val)) Then
fld_val = req.Unvalidated.Form(k_fld_name)
' If not found, check in cookie ...
If (String.IsNullOrEmpty(fld_val)) Then
cookie = req.Unvalidated.Cookies(k_fld_name)
If (cookie isNot Nothing) Then
fld_val = cookie.Value
End If
End If
End If
Catch ex As Exception
error_log(ex.ToString())
End Try
[ other logic to convert to Integer ]
Return id
End Function
但每隔一段時間，以下異常被記錄：
System.Web.HttpException (0x80004005): An error occurred while communicating with the remote host. The error code is 0x800703E3. ---> System.NotSupportedException: Specified method is not supported.
at System.Web.HttpResponseStream.get_Position()
at System.Drawing.UnsafeNativeMethods.ComStreamFromDataStream.Seek(Int64 offset, Int32 origin)
at System.Web.Hosting.IIS7WorkerRequest.RaiseCommunicationError(Int32 result, Boolean throwOnDisconnect)
at System.Web.Hosting.IIS7WorkerRequest.ReadEntityCoreSync(Byte[] buffer, Int32 offset, Int32 size)
at System.Web.Hosting.IIS7WorkerRequest.ReadEntityBody(Byte[] buffer, Int32 size)
at System.Web.HttpRequest.GetEntireRawContent()
at System.Web.HttpRequest.FillInFormCollection()
at System.Web.HttpRequest.EnsureForm()
at System.Web.UnvalidatedRequestValues.get_Form()
爲什麼System.Drawing中被顯示出來超越了我。我想知道根據異常消息不支持什麼方法？
我需要檢查，如果.Unvalidated屬性不爲null，以及任何其他的集合，即：
If (req.Unvalidated isNot Nothing) Then
...
If (req.Unvalidated.Form isNot Nothing) Then
...
End If
End If
不幸的是，MS文檔沒有說明上述性質是否是始終存在（有一個值）或不是（是空的）。
任何建議或想法，將不勝感激，因爲我對這一個磚牆。
在此先感謝。