无法从IIS服务器将大于4KB的BLOB映像插入或更新到Oracle数据库，但可以在我的本地计算机上工作

如何解决无法从IIS服务器将大于4KB的BLOB映像插入或更新到Oracle数据库，但可以在我的本地计算机上工作

我的控制器：

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult EditUserDetails(AuthorizedUser user,HttpPostedFileBase file)
{
     try
     {
       var allowedExtensions = new[] { ".img",".png",".gif",".jpg",".tiff",".bmp",".jpeg" };
                user.Username = user.Username.Replace("-",@"\");
                AuthorizedUser userDetails;
                if (file != null && file.ContentLength > 0)
                {// extract only the fieldname
                    var fileName = Path.GetFileName(file.FileName);
                    // store the file inside ~/Content/reweb/images/signature folder
                    //var path = Path.Combine(Server.MapPath("~/Content/reweb/images/signature"),fileName);
                    //file.SaveAs(path);
                    var checkextension = Path.GetExtension(file.FileName).ToLower();
                    TempData["notice"] = "";
                    if (!allowedExtensions.Contains(checkextension))

                    {
                        TempData["notice"] = "Please select a image file (with extension of img,png,gif,jpg,tiff,bmp,jpeg)!";
                        return View(user);
                    }
                    if (file.ContentLength > 1000000)
                    {
                        TempData["notice"] = "the file size can't be excceded 1000kb!";
                        return View(user);
                    }

                    user.Signature = new byte[file.ContentLength];
                    file.InputStream.Seek(0,SeekOrigin.Begin);
                    file.InputStream.Read(user.Signature,System.Convert.ToInt32(file.ContentLength));
                    TempData["notice"] = System.Convert.ToInt32(file.ContentLength);
                    file.InputStream.Close();
                }
                else
                {
                    userDetails = starkUserRoleManager.GetUserDetails(user.Username);
                    user.Signature = userDetails.Signature;
                }
              
                if (ModelState.IsValid)
                {
                    starkUserRoleManager.EditUser(user.Username,user.Email,user.Fullname,user.Signature);
                
                }
                return RedirectToAction("Index");
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

我的代码保存到数据库：

public void EditUser(string username,string email,string fullname,byte[] signature)
        {
            if(username == null || username == "")
            {
                throw new Exception("The username cannot be null or empty.");
            }
            
            using(OracleConnection conn = new OracleConnection(connectionString))
            using (OracleCommand cmd = new OracleCommand())
            using (OracleParameter p_username = new OracleParameter("p_username",OracleDbType.Varchar2,ParameterDirection.Input),p_email = new OracleParameter("p_email",p_fullname = new OracleParameter("p_fullname",p_signature = new OracleParameter("p_signature",OracleDbType.Blob,ParameterDirection.Input))
            {
                cmd.Connection = conn;
                cmd.CommandType = CommandType.StoredProcedure;
                cmd.CommandText = "SC_RE_WEB_API.app_users_update";
                cmd.BindByName = true;

                p_username.Value = username.ToUpper();
                cmd.Parameters.Add(p_username);
                p_email.Value = email == null ? (object)DBNull.Value : email;
                cmd.Parameters.Add(p_email);
                p_fullname.Value = fullname== null ? (object)DBNull.Value : fullname;
                cmd.Parameters.Add(p_fullname);
                p_signature.Value = signature == null ? (object)DBNull.Value : signature;
                cmd.Parameters.Add(p_signature);
                try
                {
                    conn.Open();
                    cmd.ExecuteNonQuery();
                }
                catch(Exception ex)
                {
                    throw ex;
                }
  }
}

保存后的错误消息：

ORA-64219：遇到无效的LOB定位器 说明：执行当前Web请求期间发生未处理的异常。请查看堆栈跟踪，以获取有关错误及其在代码中起源的更多信息。

异常详细信息：Oracle.ManagedDataAccess.Client.OracleException：ORA-64219：遇到无效的LOB定位器

源错误：

在执行当前Web请求期间生成了未处理的异常。可以使用下面的异常堆栈跟踪来标识有关异常的来源和位置的信息。

堆栈跟踪：

[OracleException（0xfadb）：ORA-64219：遇到无效的LOB定位器] C：\ Users \ jxliu \ Source \ Repos \ RealEstateWeb \ RealEstateWeb \ Controllers \ AuthorizationController.cs：167中的RealEstateWeb.Controllers.AuthorizationController.EditUserDetails（AuthorizedUser用户，HttpPostedFileBase文件） lambda_method（Closure，ControllerBase，Object []）+191 System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod（ControllerContext controllerContext，ActionDescriptor actionDescriptor，IDictionary 2 parameters) +35 System.Web.Mvc.Async.<>c.<BeginInvokeSynchronousActionMethod>b__9_0(IAsyncResult asyncResult,ActionInvocation innerInvokeState) +39 System.Web.Mvc.Async.WrappedAsyncResult 2.CallEndDelegate（IAsyncResult asyncResult）+77 System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod（IAsyncResult asyncResult）+42 System.Web.Mvc.Async。 c__DisplayClass11_0.b__0（）+80 System.Web.Mvc.Async。 c__DisplayClass11_2.b__2（）+387 System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters（IAsyncResult asyncResult）+42 System.Web.Mvc.Async。 c__DisplayClass3_6.b__4（）+50 System.Web.Mvc.Async。 c__DisplayClass3_1.b__1（IAsyncResult asyncResult）+188 System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction（IAsyncResult asyncResult）+38 System.Web.Mvc。 c.b__152_1（IAsyncResult asyncResult，ExecuteCoreState innerState）+26 System.Web.Mvc.Async.WrappedAsyncVoid 1.CallEndDelegate(IAsyncResult asyncResult) +73 System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +52 System.Web.Mvc.Async.WrappedAsyncVoid 1.CallEndDelegate（IAsyncResult asyncResult）+39 System.Web.Mvc.Controller.EndExecute（IAsyncResult asyncResult）+38 System.Web.Mvc。 c.b__20_1（IAsyncResult asyncResult，ProcessRequestState innerState）+40 System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate（IAsyncResult asyncResult）+73 System.Web.Mvc.MvcHandler.EndProcessRequest（IAsyncResult asyncResult）+38 System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute（）+602 System.Web.HttpApplication.ExecuteStepImpl（IExecutionStep步骤）+195 System.Web.HttpApplication.ExecuteStep（IExecutionStep步骤，布尔值并已完成同步）+128