如何使用带有多个参数的 VaryByParam？

在 ASP.NET MVC2中，我使用 OutputCache和 VaryByParam属性。我使用一个参数就可以很好地工作，但是当我在方法上有多个参数时，正确的语法是什么呢？

[OutputCache(Duration=30, VaryByParam = "customerId"]
public ActionResult Index(int customerId)
{
//I've got this one under control, since it only has one parameter
}


[OutputCache(Duration=30, VaryByParam = "customerId"]
public ActionResult Index(int customerId, int languageId)
{
//What is the correct syntax for VaryByParam now that I have a second parameter?
}

如何使用这两个参数让它缓存页面？是否输入两次添加属性？或者写“ customerId，language ageId”作为值? ？

53580

小开

最佳答案

Valid values for VaryByParam are one of the following:

The literal string * (asterisk), which varies by all parameters of the action method.
The literal string none (case-insensitive), which varies by no parameters of the action method.
A string containing the semicolon-separated names of the parameters you wish to vary by.

In your case, you'd want the first option:

[OutputCache(Duration = 30, VaryByParam = "*")]
public ActionResult Index(int customerId, int languageId)
{
}

If, however, you had some params you want to vary by and some that you don't, then you'd use the third option:

[OutputCache(Duration = 30, VaryByParam = "customerId;languageId")] // foo is omitted
public ActionResult Index(int customerId, int languageId, int foo)
{
}

Reference.