【正文】 Eval方法接受以前覆蓋的 ； 它根據(jù)情況改變，根據(jù)表達式推算出字段的具體細節(jié)并且將它顯示出來。 % ( ) % 頁實例屬性值被顯示。它指向數(shù)據(jù)源處的一個數(shù)據(jù)項目如表中的一個數(shù)據(jù)行或者是列表中的某個元素的值。s window title is populated using a method call. In addition, the ItemIndex property of the DataItem is used to display a row number. The ItemIndex property begins with zero, so one is added before it is displayed. Listing B contains the equivalent code. The main difference is the use of parentheses as opposed to brackets in C. Also, the casting of the rows is not necessary with . Using the object can be tedious, since you must be aware of the data type and convert it accordingly for use. Microsoft does provide the DataBinder class to further simplify development. Microsoft documentation (on MSDN) states the DataBinder class uses reflection to parse and evaluate a data binding expression against an object at runtime. This method allows RAD designers, such as Visual Studio .NET, to easily generate and parse data binding syntax. This method can also be used declaratively on a Web form39。 j++) { var coverLayer:MapLayer = [j] 。本文討論了 的主要對象 , 并深入分析了其訪問 SQL SERVER 的過程。 DataTable 會負責維護每一筆數(shù)據(jù)行保留它的初始狀態(tài)和當前的狀態(tài) , 以解決數(shù)據(jù)庫的 并發(fā)訪問問題。 j++){var coverLayer:MapLayer= [j]。s data architecture which doesn39。 selectedRegion=new Array()。可以使用相同的方式來操作從不同數(shù)據(jù)來源取得的數(shù)據(jù) , 不管底層的數(shù)據(jù)庫是 SQL Server 還是 Oracle, DataSet 的行為都是一致的。同理 , 也可以對底層數(shù)據(jù)保存體進行數(shù)據(jù)的添加、刪除或 修改操作。 selectedRegion=new Array () 。re using C, the syntax is a bit different. The following list includes the corresponding C code for each line in the previous list. Notice the basic syntax is the same, but it changes when property values are returned and converted to the appropriate data type. % % % ((DataRowView))[PropertyName] % % ((ObjectType)).PropertyName % % ((ObjectType)).() % Syntax is consistent when working with page level properties and methods. The syntax remains the same as long as string values are returned. The following list provides some examples: % propertyName %The value for a page level property is returned. asp:ListBox id=lstValues datasource=39。 同樣地，相同的句法可以用在列表控件之外。 如下則是提供了一些例子： % propertyName % 一頁面屬性值被返回。在 Visual Studio .NET 中， 這方法讓 RAD設計者很容易對數(shù)據(jù)捆綁的句法作語法分析。 但同時，當時間和資源隨著系統(tǒng)調(diào)用元素項并決定調(diào)用返回數(shù)據(jù)類型而慢慢耗盡時，就必須謹慎的使用。 它從 SQL 服務器 Northwind雇員表中選擇雇員名稱和電話號碼。 下面的表達式是用 況，讓我們來 快速的回顧下。如下 ,我們一起來談論它。 i++) { var Region:MapRegion = MapRegion ( ary [i]) 。 stageWidth = width。例如 , 一個鏈接 (Connection) 用傳統(tǒng)的 ADO Recordset 對象去讀 1000 行數(shù)據(jù)庫的記錄 , 則必須為這 1000 行記錄將內(nèi)存分配給這個鏈接直至這個鏈接的生命周期結(jié)束。 i++){var Region:MapRegion=MapRegion( [i])。 layers=new Array()。 } //create object Map = new FlashMap( stagewidth, stagehight, Mapx, Mapy)。 一、 的主要對象 中有很多對象與 ADO 中的對象功能相似 , 但 中對象的功能更強大。 DataAdapter 對象 : 通過 DataAdapter 對象建立、初始化數(shù)據(jù)表 , 從而和 DataSet 對象結(jié)合起來在內(nèi)存中存放數(shù)據(jù)。 //裝載地圖 function initMap () { () 。s discuss it together. If you are familiar with classic ASP, the declarative data binding syntax introduced in will be familiar to you even though the functionality is vastly different. Data binding expressions are the code you see between % and % characters in an ASPX file. The expressions allow you to easily bind controls to data sources, as well as properties, expressions, and results from method calls exposed by the page. While this feature is easy to use, it often causes some confusion about what is allowed and whether it should be employed. Data binding basics Data binding expressions link page properties, server control properties, and data s