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📜  ASP.Net Web表单简介

📅  最后修改于: 2020-12-27 13:21:53             🧑  作者: Mango

ASP.NET Web表单

Web表单是基于ASP.NET技术构建的网页。它在服务器上执行并生成输出到浏览器。它与任何浏览器兼容.NET公共语言运行时支持的任何语言。它很灵活，允许我们创建和添加自定义控件。

我们可以使用Visual Studio创建ASP.NET Web窗体。它是一个IDE(集成开发环境)，允许我们将服务器控件拖放到Web表单中。它还允许我们设置控件的属性，事件和方法。要编写业务逻辑，我们可以选择任何.NET语言，例如：Visual Basic或Visual C＃。

Web窗体由两个组件组成：可视部分(ASPX文件)和窗体后面的代码(位于单独的类文件中)。

图：此图显示了ASP.NET的组件

Web窗体的主要目的是克服ASP的局限性以及将视图与应用程序逻辑分开。

ASP.NET提供了各种控件，例如：服务器控件和Web窗体的HTML控件。我们在下面列出了所有这些控件。

服务器控件

下表包含Web窗体的服务器端控件。

Control Name Applicable Events Description
Label None It is used to display text on the HTML page.
TextBox TextChanged It is used to create a text input in the form.
Button Click, Command It is used to create a button.
LinkButton Click, Command It is used to create a button that looks similar to the hyperlink.
ImageButton Click It is used to create an imagesButton. Here, an image works as a Button.
Hyperlink None It is used to create a hyperlink control that responds to a click event.
DropDownList SelectedIndexChanged It is used to create a dropdown list control.
ListBox SelectedIndexCnhaged It is used to create a ListBox control like the HTML control.
DataGrid CancelCommand, EditCommand, DeleteCommand, ItemCommand, SelectedIndexChanged, PageIndexChanged, SortCommand, UpdateCommand, ItemCreated, ItemDataBound It used to create a frid that is used to show data. We can also perform paging, sorting, and formatting very easily with this control.
DataList CancelCommand, EditCommand, DeleteCommand, ItemCommand, SelectedIndexChanged, UpdateCommand, ItemCreated, ItemDataBound It is used to create datalist that is non-tabular and used to show data.
Repeater ItemCommand, ItemCreated, ItemDataBound It allows us to create a non-tabular type of format for data. You can bind the data to template items, which are like bits of HTML put together in a specific repeating format.
CheckBox CheckChanged It is used to create checkbox.
CheckBoxList SelectedIndexChanged It is used to create a group of check boxes that all work together.
RadioButton CheckChanged It is used to create radio button.
RadioButtonList SelectedIndexChanged It is used to create a group of radio button controls that all work together.
Image None It is used to show image within the page.
Panel None It is used to create a panel that works as a container.
PlaceHolder None It is used to set placeholder for the control.
Calendar SelectionChanged, VisibleMonthChanged, DayRender It is used to create a calendar. We can set the default date, move forward and backward etc.
AdRotator AdCreated It allows us to specify a list of ads to display. Each time the user re-displays the page.
Table None It is used to create table.
XML None It is used to display XML documents within the HTML.
Literal None It is like a label in that it displays a literal, but allows us to create new literals at runtime and place them into this control.

HTML控件

这些控件由浏览器呈现。我们还可以将HTML控件作为服务器控件。我们将在本教程的进一步内容中对此进行讨论。

Controls Name Description
Button It is used to create HTML button.
Reset Button Resets all other HTML form elements on a form to a default value
Submit Button Automatically POSTs the form data to the specified page listed in the Action attribute in the FORM tag
Text Field Gives the user an input area on an HTML form
Text Area Used for multi-line input on an HTML form
File Field Places a text field and a Browse button on a form and allows the user to select a file name from their local machine when the Browse button is clicked
Password Field An input area on an HTML form, although any characters typed into this field are displayed as asterisks
CheckBox Gives the user a check box that they can select or clear
Radio Button Used two or more to a form, and allows the user to choose one of the controls
Table Allows you to present information in a tabular format
Image Displays an image on an HTML form
ListBox Displays a list of items to the user. You can set the size from two or more to specify how many items you wish show. If there are more items than will fit within this limit, a scroll bar is automatically added to this control.
Dropdown Displays a list of items to the user, but only one item at a time will appear. The user can click a down arrow from the side of this control and a list of items will be displayed.
Horizontal Rule Displays a horizontal line across the HTML page