外文翻譯---aspnet介紹以及內(nèi)聯(lián)代碼和共享-jsp程序-免費(fèi)閱讀
【正文】 Import Namespace=MyCustomNamespace .NET Framework 提供了表示 Framework 的各個(gè)部件的大量類庫程序集。 默認(rèn)情況下， App_Code 目錄只能包含同一種語言的文件。 盡管可以將代碼 放在站點(diǎn)的每個(gè)頁上（使用上一節(jié)中所述的內(nèi)聯(lián)或代碼隱藏分離模型），但有時(shí)您將希望在站點(diǎn)中的多個(gè)頁之間共享代碼。代碼隱藏模型非常適用于此類環(huán)境。但是，當(dāng)客戶端在 TextBox 中鍵入了一個(gè)值并單擊了 Button 后，該頁會(huì)回發(fā)到服務(wù)器，然后該頁使用頁中的代碼處理此單擊事件，動(dòng)態(tài)地更新 Label 控件的 Text 屬性。例如，下面的示例演示如何使用 asp:adrotator 控件在頁上動(dòng)態(tài)顯示循環(huán)廣告。內(nèi)部 HTML 標(biāo)記由 命名空間中的某個(gè)控件處理。 除了代碼和標(biāo)記之外， 頁還可以包含服務(wù)器控件，這些控件是可編程的服務(wù)器端對象，通常表示頁中的用戶界面元素，如文本框或圖像等。這包括對 % % 代碼呈現(xiàn)塊的支持，這些塊可以與 .aspx 文件中的 HTML 內(nèi)容混用。當(dāng)瀏覽器客戶端請求 .aspx 資源時(shí)， 運(yùn)行庫會(huì)對目標(biāo)文件進(jìn)行分析并將其編譯為 .NET Framework 類。t explicitly map to one of the controls is assigned the type of . Important: Note that these server controls automatically maintain any cliententered values between round trips to the server. This control state is not stored on the server (it is instead stored within an input type=hidden form field that is roundtripped between requests). Note also that no clientside script is required. In addition to supporting standard HTML input controls, enables developers to utilize richer custom controls on their pages. For example, the following sample demonstrates how the asp:adrotator control can be used to dynamically display rotating ads on a page. Each server control is capable of exposing an object model containing properties, methods, and events. developers can use this object model to cleanly modify and interact with the page. Note, however, how much cleaner and easier the code is in this new servercontrolbased version. As we will see later in the tutorial, the page Framework also exposes a variety of pagelevel events that you can handle to write code to execute a specific time during the processing of the page. Examples of these events are Page_Load and Page_Render. The example below demonstrates a simple page with three server controls, a TextBox, Button, and a Label. Initially these controls just render their HTML form equivalents. However, when a value is typed in the TextBox and the Button is clicked on the client, the page posts back to the server and the page handles this click event in the code of the page, dynamically updating the Text property of the Label control. The page then rerenders to reflect the updated text. This simple example demonstrates the basic mechanics behind the server control model that has made one of the easiest Web programming models to learn and master. Note that in the preceding example the event handler for the Button was located between tags in the same page containing the server controls. calls this type of page programming codeinline, and it is very useful when you want to maintain your code and presentation logic in a single file. However, also supports another way to factor your code and presentation content, called the codebehind model. When using codebehind, the code for handling events is located in a physically separate file from the page that contains server controls and markup. This clear delineation between code and content is useful when you need to maintain these separately, such as when more than one person is involved in creating the application. It is often mon in group projects to have designers working on the U
畢業(yè)設(shè)計(jì)相關(guān)推薦
鄂ICP備17016276號-1