c# - 无法调用 HttpRuntime.Cache.Insert

Question

我正在尝试在 HttpRumtimeCache 中插入一个值。

 System.Web.HttpRuntime.Cache.Insert("key", "value", null, DateTime.Now.AddSeconds(3200), TimeSpan.Zero);

但我得到这个错误：

'Dictionary<string, string>' does not contain a definition for 'Insert' and no accessible extension method 'Insert' accepting a first argument of type 'Dictionary<string, string>' could be found (are you missing a using directive or an assembly reference?)    

你能就此提出建议吗？