ActionResult AcceptVerbsAttribute默认的HTTP方法是什么？

Question

我知道您可以通过添加一个ActionResult方法来限制特定的AcceptVerbsAttribute方法响应哪些HTTP方法。

[AcceptVerbs(HttpVerbs.Get)]
public ActionResult Index() {
    ...
}

但是我想知道:如果没有显式的AcceptVerbs(...)属性，ActionResult方法将接受哪些HTTP方法？

我猜想是GET，HEAD和POST，但我只是想再查一遍。

谢谢。

Answer 1

没有AcceptVerbsAttribute，您的Action将接受任何HTTP方法的请求。顺便说一句，您可以在RouteTable中限制HTTP方法：

routes.MapRoute(
    "Default",                                              // Route name
    "{controller}/{action}/{id}",                           // URL with parameters
    new { controller = "Home", action = "Index", id = "" }, // Parameter defaults
    new { HttpMethod = new HttpMethodConstraint(
        new[] { "GET", "POST" }) }                          // Only GET or POST
);

Answer 2

它将接受所有HTTP方法。

查看来自ActionMethodSelector.cs的稍微格式化的片段(ASP.NET MVC源代码可以下载这里)：

private static List<MethodInfo> RunSelectionFilters(ControllerContext 
    controllerContext, List<MethodInfo> methodInfos) 
{
    // remove all methods which are opting out of this request
    // to opt out, at least one attribute defined on the method must 
    // return false

    List<MethodInfo> matchesWithSelectionAttributes = new List<MethodInfo>();
    List<MethodInfo> matchesWithoutSelectionAttributes = new List<MethodInfo>();

    foreach (MethodInfo methodInfo in methodInfos) 
    {
        ActionMethodSelectorAttribute[] attrs = 
            (ActionMethodSelectorAttribute[])methodInfo.
                GetCustomAttributes(typeof(ActionMethodSelectorAttribute), 
                    true /* inherit */);

        if (attrs.Length == 0) 
        {
            matchesWithoutSelectionAttributes.Add(methodInfo);
        }
        else 
            if (attrs.All(attr => attr.IsValidForRequest(controllerContext, 
                methodInfo))) 
            {
                matchesWithSelectionAttributes.Add(methodInfo);
            }
    }

    // if a matching action method had a selection attribute, 
    // consider it more specific than a matching action method
    // without a selection attribute
    return (matchesWithSelectionAttributes.Count > 0) ? 
        matchesWithSelectionAttributes : 
        matchesWithoutSelectionAttributes;
}

因此，如果没有更好的匹配操作方法与显式属性，将使用没有属性的动作方法。