以編程方式限制加載時顯示的列表框項目的數量

Question

我有一個 Silverlight 2.0 列表框，它從自定義列表中讀取數據@ SharePoint 2007。如何限制在加載 Page.Z44CC44B81911F4BA4581C725DA61 時顯示的項目數量？

在這里我有@ Page.xaml.cs：

private void ProcessResponse()
        {
            XDocument results = XDocument.Parse(_responseString);

            _StaffNews = (from item in results.Descendants(XName.Get("row", "#RowsetSchema"))

                        //where !item.Element("NewsThumbnail").Attribute("src").Value.EndsWith(".gif")
                        select new StaffNews()
                        {                   
                            Title = item.Attribute("ows_Title").Value,
                            NewsBody = item.Attribute("ows_NewsBody").Value,
                            NewsThumbnail = FormatImageUrl(item.Attribute("ows_NewsThumbnail").Value),
                            DatePublished = item.Attribute("ows_Date_Published").Value,
                            PublishedBy = item.Attribute("ows_PublishedBy").Value,
                        }).ToList();
            this.DataContext = _StaffNews;
            //NewsList.SelectedIndex = -1;            
        }

Answer 1

您可以將.Take(20)放在ToList() ) 后面，以僅從列表中獲取 20 個項目。

Answer 2

Take方法允許您對項目設置限制。 它只會迭代集合，直到達到最大計數。 您可以只使用它而不是ToList()或者如果_StaffNews被定義為List<T> ，只需將它們組合起來.Take(items).ToList();

private void ProcessResponse()
{    
            var items = 10;
            XDocument results = XDocument.Parse(_responseString);

            _StaffNews = (from item in results.Descendants(XName.Get("row", "#RowsetSchema"))

                    //where !item.Element("NewsThumbnail").Attribute("src").Value.EndsWith(".gif")
                    select new StaffNews()
                    {                   
                        Title = item.Attribute("ows_Title").Value,
                        NewsBody = item.Attribute("ows_NewsBody").Value,
                        NewsThumbnail = FormatImageUrl(item.Attribute("ows_NewsThumbnail").Value),
                        DatePublished = item.Attribute("ows_Date_Published").Value,
                        PublishedBy = item.Attribute("ows_PublishedBy").Value,
                    }).Take(items);
            this.DataContext = _StaffNews;
            //NewsList.SelectedIndex = -1;            
}