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我有一个可以像一个友好的URL如何检查是否RouteData.Values是不是在asp.net web表单
例如:
www.abc.com/news/
www.abc.com/news/year/
如果URL与出一年,然后我展示最新的20个新闻,否则我会让记者从日在微粒年
if (!string.IsNullOrEmpty(HttpContext.Current.Request.RequestContext.RouteData.Values["YEAR"].ToString())) {
_Year = int.Parse(HttpContext.Current.Request.RequestContext.RouteData.Values["YEAR"].ToString());
}
上面的代码生成以下错误
[System.NullReferenceException] = {"Object reference not set to an instance of an object."}
我不知道如何解决这个错误。我如何检查路由值是否为空,以便我可以相应地执行代码。
的Global.asax代码
routes.MapPageRoute("news", "news/", "~/news.aspx", false,
new RouteValueDictionary {
{
"path", "page-not-found"
}, {
"pagename", "page-not-found"
}
});
routes.MapPageRoute("news_YearWise", "news/{YEAR}", "~/news.aspx", false,
new RouteValueDictionary {
{
"YEAR", "0"
}
},
new RouteValueDictionary {
{
"YEAR", "[0-9]{1,8}"
},
});
解决:
if (RouteData.Values["YEAR"] != null)
{ _Year = int.Parse(RouteData.Values["YEAR"].ToString()); }