ASP.NET教程:网页表单多个按钮完成不同功能

以下为引用的内容：

[HttpPost]
[MultiButton(Name = "delete", Argument = "id")]
public ActionResult Delete(string id)
{
    var response = System.Web.HttpContext.Current.Response;
    response.Write("Delete action was invoked with " + id);
    return View();
}

以下为引用的内容：

<input type="submit" value="not important" name="delete" />
<input type="submit" value="not important" name="delete:id" />

以下为引用的内容：

[AttributeUsage(AttributeTargets.Method, AllowMultiple = false, Inherited = true)]
public class MultiButtonAttribute : ActionNameSelectorAttribute
{
    public string Name { get; set; }
    public string Argument { get; set; }

    public override bool IsValidName(ControllerContext controllerContext, string actionName, MethodInfo methodInfo)
    {
        var key = ButtonKeyFrom(controllerContext);
        var keyIsValid = IsValid(key);

        if (keyIsValid)
        {
            UpdateValueProviderIn(controllerContext, ValueFrom(key));
        }

        return keyIsValid;
    }

    private string ButtonKeyFrom(ControllerContext controllerContext)
    {
        var keys = controllerContext.HttpContext.Request.Params.AllKeys;
        return keys.FirstOrDefault(KeyStartsWithButtonName);
    }

    private static bool IsValid(string key)
    {
        return key != null;
    }

    private static string ValueFrom(string key)
    {
        var parts = key.Split(":".ToCharArray());
        return parts.Length < 2 ? null : parts[1];
    }

    private void UpdateValueProviderIn(ControllerContext controllerContext, string value)
    {
        if (string.IsNullOrEmpty(Argument)) return;
        controllerContext.Controller.ValueProvider[Argument] = new ValueProviderResult(value, value, null);
    }

    private bool KeyStartsWithButtonName(string key)
    {
        return key.StartsWith(Name, StringComparison.InvariantCultureIgnoreCase);
    }
}