我的法典如下。
RssFeedReader rss = (RssFeedReader)this.ParentToolPane.SelectedWebPart;
我的问题只是在时候才知道这是否如此。 家长ToolPane.SlectWebPart是RsFeedReader或RssCoun
我将如何检查物体类型,并把它带上 app子?
很多 感谢
你可以这样做:
if (this.ParentToolPane.SelectedWebPart is RssFeedReader)
//...
检查是否属于某种类型。 或者,你可以把它当作一种类型,如果它不是这种类型,那将是无效的。
RssFeedReader reader = this.ParentToolPane.SelectedWebPart as RssFeedReader;
if (reader != null)
{
//...
}
你可以说
RssFeedReader rss;
rss = this.ParentToolPane.SelectedWebPart as RssFeedReader;
if(rss != null) {
// an RssFeedReader
}
RssCountry rc;
rc = this.ParentToolPane.SelectedWebPart as RssCountry;
if(rc != null) {
// an RssCountry
}
或
if(this.ParentToolPane.SelectedWebPart is RssFeedReader) {
// an RssFeedReader
RssFeedReader rss = (RssFeedReader)this.ParentToolPane.SelectedWebPart;
}
if(this.ParentToolPane.SelectedWebPart is RssCountry) {
// an RssCountry
RssCountry rc = (RssCountry)this.ParentToolPane.SelectedWebPart;
}
但必须警告。 几乎在你逻辑上以这种逻辑为依据的任何时候,都是一种坏的设计ell!
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