动态加载用户控制

我的代码如下

 string[] keys = { "myCustomUserControl.ascx", "myCustomUserControl.ascx.cs", "myCustomUserControl.ascx.designer.cs" };
            string customUserControlName = CommonDataCalls.GetCustomUserControlName(keys);
            UserControl objUserControl = (UserControl)this.LoadControl("~/UserControls/" + userControlName);
            userControlPlaceHolder.Controls.Add(objUserControl);

GetCustomUserControlName的定义如下

public string GetCustomUserControlName(string[] keys)
    {
        try
        {
            string userConrolsPhysicalPtah = System.Web.HttpContext.Current.Server.MapPath("~/UserControls/");
            DataTable objDataTable = new DataTable();
            foreach (string key in keys)
            {
                objRequestVO.addObject("ACA_KEY", key);
                CResponseVO objResponseVO = (CResponseVO)objGateway.ExecuteBusinessService(CConstant.ADMIN, CConstant.ASSEMBLY_INFO, CConstant.SELECT, objRequestVO);
                DataSet objDataSet = (DataSet)objResponseVO.getObject("RES_DS");
                cUserTrce objGeneral = new cUserTrce();
                if (!objGeneral.IsNullOrEmptyDataset(objDataSet))
                {
                    if (objDataTable.Rows.Count == 0)
                    {
                        objDataTable = objDataSet.Tables[0].Clone();
                    }
                    objDataTable.Rows.Add(objDataSet.Tables[0].Rows[0].ItemArray);
                }
            }
            if (objDataTable != null && objDataTable.Rows.Count == 3)
            {                
                string containerName = "usercontrols";
                foreach (DataRow dr in objDataTable.Rows)
                {
                    string userControlFileBlobUrl = dr["ACA_ASSEMBLY_PATH"].ToString();
                    string userControlFileName = dr["ACA_CLASS_NAME"].ToString();
                    Storage.Blob blobHandler = new Storage.Blob();
                    Stream blobstream = blobHandler.GetBlob(userControlFileBlobUrl, containerName);
                    if (!(File.Exists(userConrolsPhysicalPtah + userControlFileName)))
                    {
                        MemoryStream ms = (MemoryStream)blobstream;
                        FileStream outStream = File.OpenWrite(userConrolsPhysicalPtah + userControlFileName);
                        ms.WriteTo(outStream);
                        outStream.Flush();
                        outStream.Close();
                    }
                }

                string customUserControlName = (from DataRow row in objDataTable.Rows
                                                where row["ACA_KEY"].ToString() == keys[0]
                                                select row["ACA_CLASS_NAME"].ToString()).First();
                return customUserControlName;
            }
            else
            {
                return null;
            }
        }
        catch
        {
            return null;
        }
    }

该方法基本上在运行时将用户控件复制到虚拟路径。

在aspx.cs页面我尝试动态加载它。

但是我可以看到文件被复制到虚拟路径，但是这个。加载控制给了我一个异常，说不能加载类型'myCustomUserControl'。

我正在使用azure web角色