安全例外

Question

我有一個用於上傳視頻和圖像的Web應用程序。在運行正常的本地服務器中。但是當我將其上傳到Web服務器時出現錯誤，我無法上傳文件。錯誤是

Security Exception 
Description: The application attempted to perform an operation not allowed by the security policy.  To grant this application the required permission please contact your system administrator or change the application's trust level in the configuration file. 

Exception Details: System.Security.SecurityException: Request for the permission of type 'System.Security.Permissions.FileIOPermission, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.

Source Error: 

The source code that generated this unhandled exception can only be shown when compiled in debug mode. To enable this, please follow one of the below steps, then request the URL:

1. Add a "Debug=true" directive at the top of the file that generated the error. Example:

  <%@ Page Language="C#" Debug="true" %>

or:

2) Add the following section to the configuration file of your application:

<configuration>
   <system.web>
       <compilation debug="true"/>
   </system.web>
</configuration>

Note that this second technique will cause all files within a given application to be compiled in debug mode. The first technique will cause only that particular file to be compiled in debug mode.

Important: Running applications in debug mode does incur a memory/performance overhead. You should make sure that an application has debugging disabled before deploying into production scenario.  

我正在使用代碼進行上傳。

Dim connectionstring As String = ConfigurationManager.ConnectionStrings("UploadConnectionString").ConnectionString
                    connection = New SqlConnection(connectionstring)
                    Dim cmd As New SqlCommand("insert into FileM (FileName,[File],FilePath,FileSize)" + "values(@FileName,@File,@FilePath,@FileSize)", connection)
                    cmd.Parameters.Add("@FileName", SqlDbType.NVarChar, buffer.Length).Value = FileUpload1.FileName
                    cmd.Parameters.Add("@File", SqlDbType.VarBinary).Value = buffer
                    cmd.Parameters.Add("@FileSize", SqlDbType.BigInt).Value = file.ContentLength
                    cmd.Parameters.Add("@FilePath", SqlDbType.VarChar).Value = path
                    Using connection
                        connection.Open()
                        Dim i As Integer = cmd.ExecuteNonQuery

                    End Using

這種上傳類型有任何問題，還是想通過業務邏輯層插入表中？

Answer 1

該錯誤可能是由於以下事實造成的：您的應用程序所運行的帳戶沒有權限寫入要存儲文件的目錄。