如何向管线参数添加约束?

这个问题以前有人问过。见:

Constraint Question

本质上,使用正则表达式:

routes.MapRoute(
    "Search",                                               // Route name
    "Search/{affiliateId}",                                 // URL with parameters
    new { controller = "Syndication", action = "Search" },   // Parameter defaults
    new { affiliateId = "SOME REGEX TO TEST GUID FORMAT" } // constraints
);