C#相对虚拟路径怎样修改

System.Configuration.Configuration config = System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration("C:\Users\source\repos\dingding\dingding\App.config");
报错提示此处禁止使用相对虚拟路径，应该怎样修改？

File.Path(../)
strPath = this.Server.MapPath(Request.PhysicalApplicationPath);
https://blog.csdn.net/ClearLoveQ/article/details/80774367