c# - 缓存 WCF 服务的问题 - "AspNetCacheProfileAttribute can only be used with GET operations"

Question

我有一个 WCF 服务，它确实可以工作，但确实需要缓存响应。 我遵循了一些在线指导，但收到以下错误:

AspNetCacheProfileAttribute can only be used with GET operations.

我已经在 Postman 中检查了这一点，以完全确定我的客户端代码没有以错误的方式发出请求，结果相同。

界面如下所示:

public interface INavbar
{
    [OperationContract]
    [WebInvoke(Method = "GET", ResponseFormat = WebMessageFormat.Json, BodyStyle = WebMessageBodyStyle.Bare)]        
    List<Navbar.simpleNav> getNavList();
}

服务返回一个 JSON 对象列表，我尝试添加缓存时所做的 2 个更改是将 AspNetCacheProfile 属性添加到类中，并将缓存配置文件详细信息添加到我的 web.config 中。

类的属性:

[AspNetCacheProfile("CacheFor180Seconds")]

网络配置:

<caching>
  <outputCacheSettings>
    <outputCacheProfiles>
      <add name="CacheFor180Seconds" duration="180" varyByParam="none"/>
    </outputCacheProfiles>
  </outputCacheSettings>
</caching>

据我所知，这都是非常标准的东西，但可能我正在尝试以错误的方式执行此操作，因此我们将不胜感激。

非常感谢

Answer 1

您需要使用WebGet而不是WebInvoke

差异很微妙但很重要:

WebInvoke

Represents an attribute indicating that a service operation is logically an invoke operation and that it can be called by the WCF REST programming model.

WebGet

Represents an attribute indicating that a service operation is logically a retrieval operation and that it can be called by the WCF REST programming model.

再往下，在 WebInvoke 的备注部分:

The WebInvokeAttribute attribute is applied to a service operation … and associates the operation with a UriTemplate as well as an underlying transport verb that represents an invocation (for example, HTTP POST, PUT, or DELETE). … The WebInvokeAttribute determines what HTTP method that a service operation responds to. By default, all methods that have the WebInvokeAttribute applied respond to POST requests. The Method property allows you to specify a different HTTP method. If you want a service operation to respond to GET, use the WebGetAttribute instead.