QueryExtender 类

定义

允许在数据源中没有显式 Where 子句的情况下筛选数据源中的数据。Enables data from a data source to be filtered without an explicit Where clause in the data source.

public ref class QueryExtender : System::Web::UI::Control
[System.Drawing.ToolboxBitmap(typeof(System.Web.UI.WebControls.QueryExtender), "QueryExtender.bmp")]
public class QueryExtender : System.Web.UI.Control
type QueryExtender = class
    inherit Control
Public Class QueryExtender
Inherits Control
继承
QueryExtender
属性

示例

下面的示例演示如何使用QueryExtender控件在网页中提供搜索函数。The following example shows how to use the QueryExtender control to provide a search function in a Web page. 控件使用在TextBoxSearch控件中输入的文本来搜索 ProductName 和供应商的内容。产品表在从LinqDataSource控件返回的数据中的列。 QueryExtenderThe QueryExtender control uses the text that is entered in the TextBoxSearch control to search for contents in the ProductName and Supplier.CompanyName columns of a Products table in the data that is returned from the LinqDataSource control. SearchExpression对象用于执行搜索。The SearchExpression object is used to perform the search. DataFields属性指定要搜索的数据字段。The DataFields property specifies the data fields to search. SearchType属性指定要执行的搜索类型。The SearchType property specifies the type of search to perform. ControlParameter元素指定包含要用于搜索的文本的控件。The ControlParameter element specifies the control that contains the text to use for the search. 此代码示例是在演练中提供的一个更大示例的一部分:使用声明性语法筛选网页中的数据。This code example is part of a larger example that is provided in Walkthrough: Filtering Data in a Web Page Using Declarative Syntax.

<asp:LinqDataSource ID="dataSource" runat="server"   
    TableName="Products">  
</asp:LinqDataSource>  
<asp:QueryExtender TargetControlID="dataSource" runat="server">  
  <asp:SearchExpression DataFields="ProductName, Supplier.CompanyName"   
        SearchType="StartsWith">  
    <asp:ControlParameter ControlID="TextBoxSearch" />  
  </asp:SearchExpression>  
</asp:QueryExtender>  

下面的示例演示如何使用QueryExtender控件在网页中搜索指定范围内的值。The following example shows how to use the QueryExtender control to search a Web page for values in a specified range. 控件使用在TextBoxFrom LinqDataSourceTextBoxTo控件中输入的值来搜索 ProductName 和供应商. 中的值。 Products 表在从控件返回的数据中的列QueryExtender.The QueryExtender control uses the values that are entered in the TextBoxFrom and TextBoxTo controls to search for values in the ProductName and Supplier.CompanyName columns of a Products table in the data that is returned from the LinqDataSource control. ControlParameter元素指定文本框控件, 这些控件包含用于搜索范围的最小值和最大值。The ControlParameter element specifies the text box controls that contain the minimum and maximum values to use for searching the range. MinTypeMaxType属性指定在返回的数据中必须包含最小值和最大值。The MinType and MaxType properties specify that the minimum and maximum values must be included in the data that is returned. 此代码示例是演练中提供的一个更大示例的一部分:使用声明性语法筛选网页中的数据。This code example is part of a larger example provided in Walkthrough: Filtering Data in a Web Page Using Declarative Syntax.

<asp:LinqDataSource ID="dataSource" runat="server"   
    TableName="Products">  
</asp:LinqDataSource>  
<asp:QueryExtender TargetControlID="dataSource" runat="server">  
  <asp:RangeExpression DataField="UnitPrice" MinType="Inclusive"   
        MaxType="Inclusive">  
    <asp:ControlParameter ControlID="TextBoxFrom" />  
    <asp:ControlParameter ControlID="TexBoxTo" />  
  </asp:RangeExpression>  
</asp:QueryExtender>  

注解

本主题内容:In this topic:

介绍Introduction

控件用于为从数据源检索的数据创建筛选器, 而无需在数据源中使用Where显式子句。 QueryExtenderThe QueryExtender control is used to create filters for data that is retrieved from a data source, without using an explicit Where clause in the data source. QueryExtender控件可用于通过声明性语法指定筛选。The QueryExtender control can be used to specify filtering by using declarative syntax.

背景Background

筛选只显示满足指定条件的记录, 从数据源中排除数据。Filtering excludes data from a data source by displaying only the records that meet specified criteria. 通过筛选, 您可以显示数据集中的数据的不同视图, 而不会影响数据集中的数据。Filtering enables you to present different views of the data that is in a data set without affecting the data in the data set.

筛选通常要求您创建一个Where要应用于查询数据源的命令的子句。Filtering typically requires that you create a Where clause to apply to the command that queries the data source. 但是, 数据Where源控件的属性可能不会公开可用的完整功能。However, the Where property of the data source control might not expose the full functionality that is available. 例如, QueryExtender 控件使您可以通过在数据字段的开头、结尾或任意位置搜索字符串来查询表。For example, the QueryExtender control enables you to query a table by searching for strings at the beginning, end or anywhere in .data field.

为了公开 LINQ 中提供的完整功能并使筛选数据更容易, ASP.NETASP.NET QueryExtender提供控件。To expose the full functionality that is available in LINQ and to make filtering data easier, ASP.NETASP.NET provides the QueryExtender control. QueryExtender控件具有以下优势:The QueryExtender control has the following benefits:

  • 它提供比编写Where子句更丰富的筛选体验。It provides a richer filtering experience than writing a Where clause. 例如, 您可以使用PropertyExpression筛选器在 Products 表中搜索布尔值, 而无需编写查询。For example, you can search a Products table for Boolean values by using the PropertyExpression filter without writing a query.

  • 它允许您通过对LinqDataSourceEntityDataSource控件以及您可能使用的任何其他数据源控件使用相同的语法来指定筛选器。It lets you specify filters by using the same syntax for the LinqDataSource and EntityDataSource controls and for any other data source controls that you might use.

  • 它可以与LinqDataSource控件一起使用, EntityDataSource也可以与控件一起使用, 也可以与第三方数据源一起使用。It can be used with LinqDataSource control, with a EntityDataSource control, or with third-party data sources.

筛选器选项Filter Options

QueryExtender控件支持多种选项, 这些选项可用于筛选数据。The QueryExtender control supports a variety of options that you can use to filter data. 控件使您可以搜索字符串, 在指定范围内搜索数字值, 并将表中的属性值与指定的值进行比较。The control lets you search strings, search numeric values in a specified range, and compare a property value in a table to a specified value. 该控件还使您能够对数据进行排序并提供自定义查询。The control also lets you sort the data and provide custom queries.

这些选项在QueryExtender控件中作为 LINQ 表达式提供。These options are provided as LINQ expressions in the QueryExtender control. QueryExtender控件还支持特定于ASP.NETASP.NET动态数据应用程序的表达式。The QueryExtender control also supports expressions that are specific to ASP.NETASP.NET Dynamic Data applications.

下表列出了可用于在QueryExtender控件中筛选数据的选项。The following table lists the options that you can use to filter data in the QueryExtender control.

表达式Expression 说明Description
ControlFilterExpression (仅动态数据)使用在源数据绑定控件中选择的数据键来生成数据库查询。(Dynamic Data only) Builds a database query by using the data key that is selected in a source data-bound control.

有关如何使用此筛选器选项的信息, 请参阅如何:使用动态数据中的父表中的值筛选表行。For information about how to use this filter option, see How to: Filter Table Rows Using Values from a Parent Table in Dynamic Data.
CustomExpression 指定数据源的用户定义表达式。Specifies a user-defined expression for a data source. 可以在事件处理程序中调用自定义 LINQ 表达式。The custom LINQ expression can be invoked in an event handler.
DynamicFilterExpression (仅动态数据)使用指定DynamicFilter的控件生成数据库查询。(Dynamic Data only) Builds a database query by using the specified DynamicFilter control.

有关如何使用此筛选器选项的信息, 请参阅如何:使用动态数据中的外键筛选表行。For information about how to use this filter option, see How to: Filter Table Rows Using Foreign Key in Dynamic Data.
MethodExpression 为数据源指定用户定义的 LINQ 表达式。Specifies a user-defined LINQ expression for a data source. 表达式在方法中调用。The expression is invoked in a method.
OrderByExpression 将排序表达式IQueryable应用于数据源对象。Applies a sort expression to an IQueryable data source object. 应用OrderByExpression值后, 可以通过ThenByExpressions指定值来应用其他排序操作。After you apply the OrderByExpression value, you can apply additional sort operations by specifying a ThenByExpressions value.
PropertyExpression 比较在WhereParameters集合中指定的数据字段和属性值的属性。Compares the properties the data field and property values that are specified in the WhereParameters collection.
RangeExpression 确定值是大于还是小于指定值, 或者值是否介于两个值之间。Determines whether a value is greater than or less than a specified value, or whether a value is between two values.
SearchExpression 将一个或多个字段中的值与指定的字符串值进行比较。Compares values in a field or fields to a specified string value.

可以单独使用这些QueryExtender选项, 也可以将它们组合在一起提供网页中的复杂筛选。You can use these QueryExtender options individually or you can combine them to provide complex filtering in a Web page. 有关详细信息, 请参阅QueryExtender Web 服务器控件概述For more information, see QueryExtender Web Server Control Overview. 演练:使用声明性语法筛选网页中的数据Walkthrough: Filtering Data in a Web Page Using Declarative Syntax

任务Tasks

下表列出了演示如何使用QueryExtender控件来筛选数据的任务。The following table lists tasks that show how to use the QueryExtender control to filter data.

DocumentDocument 任务Task
演练:使用声明性语法筛选网页中的数据Walkthrough: Filtering Data in a Web Page Using Declarative Syntax 演示如何使用QueryExtender控件提供的筛选选项。Shows how to use the filter options that the QueryExtender control provides.

声明性语法Declarative Syntax

<asp:QueryExtender   
    EnableViewState="True|False"  
    ID="string"  
    OnDataBinding="DataBiding event handler"  
    OnDisposed="Disposed event handler"  
    OnInit="Init event handler  
    OnLoad="Load event handler"  
    OnPreRender="PreRender event handler"  
    OnUnload="UnLoad event handler"  
    Runat="server"  
    TargetControlID="string"  
    Visible="True|False"  
>  
        <asp:ControlFilterExpression   
            ControlD="string"  
            Column="string">   
        </asp:ControlFilterExpression>  
        <asp:DynamicFilterExpression  
            ControlD="string"  
        </asp:DynamicFilterExpression>  
        <asp:CustomExpression="string"  
            OnQuerying="OnQuerying event handler">  
        </asp:CustomExpression>  
        <asp:OrderByExpression="string"  
            DataField="string"  
            Direction="string">  
            <asp:ThenByExpression  
                 DataField="string"  
                 Direction="string"  
            </asp:ThenBy>  
        </asp:OrderByExpression>  
        <asp:PropertyExpression="string">  
                <!-- child controls -->  
        </asp:PropertyExpression  
        >  
        <asp:RangeExpression="integer"  
            Datafield="string"  
            MaxType="Exclusive|Inclusive|None"  
            MinType="Exclusive|Inclusive|None">  
                <!--child controls-->  
        </asp:RangeExpression>  
        <asp:SearchExpression="string"  
            ComparisonType="CurrentCulture|CurrentCultureIgnoreCase|  
                InvariantCulture|InvariantCultureIgnoreCase|  
                Ordinal|OrdinalIgnoreCase"  
            DataField="string"  
            SearchType="Contains|EndsWith|StartsWith">  
                <!--child controls-->  
        </asp:SearchExpression>  
</asp:QueryExtender>  

构造函数

QueryExtender()

初始化 QueryExtender 类的新实例。Initializes a new instance of the QueryExtender Class.

属性

Adapter

获取控件的浏览器特定适配器。Gets the browser-specific adapter for the control.

(继承自 Control)
AppRelativeTemplateSourceDirectory

获取或设置包含该控件的 PageUserControl 对象的应用程序相对虚拟目录。Gets or sets the application-relative virtual directory of the Page or UserControl object that contains this control.

(继承自 Control)
BindingContainer

获取包含该控件的数据绑定的控件。Gets the control that contains this control's data binding.

(继承自 Control)
ChildControlsCreated

获取一个值,该值指示是否已创建服务器控件的子控件。Gets a value that indicates whether the server control's child controls have been created.

(继承自 Control)
ClientID

获取由 ASP.NET 生成的 HTML 标记的控件 ID。Gets the control ID for HTML markup that is generated by ASP.NET.

(继承自 Control)
ClientIDMode

获取或设置用于生成 ClientID 属性值的算法。Gets or sets the algorithm that is used to generate the value of the ClientID property.

(继承自 Control)
ClientIDSeparator

获取一个字符值,该值表示 ClientID 属性中使用的分隔符字符。Gets a character value representing the separator character used in the ClientID property.

(继承自 Control)
Context

为当前 Web 请求获取与服务器控件关联的 HttpContext 对象。Gets the HttpContext object associated with the server control for the current Web request.

(继承自 Control)
Controls

获取 ControlCollection 对象,该对象表示 UI 层次结构中的指定服务器控件的子控件。Gets a ControlCollection object that represents the child controls for a specified server control in the UI hierarchy.

(继承自 Control)
DataItemContainer

如果命名容器实现 IDataItemContainer,则获取对命名容器的引用。Gets a reference to the naming container if the naming container implements IDataItemContainer.

(继承自 Control)
DataKeysContainer

如果命名容器实现 IDataKeysControl,则获取对命名容器的引用。Gets a reference to the naming container if the naming container implements IDataKeysControl.

(继承自 Control)
DataSource

获取要用于查询的数据源控件(IDataSource 对象)。Gets the data source control (IDataSource object) to use for the query.

DesignMode

获取一个值,该值指示是否正在使用设计图面上的一个控件。Gets a value indicating whether a control is being used on a design surface.

(继承自 Control)
EnableTheming

获取或设置一个值,该值指示主题是否应用于该控件。Gets or sets a value indicating whether themes apply to this control.

(继承自 Control)
EnableViewState

获取或设置一个值,该值指示服务器控件是否向发出请求的客户端保持自己的视图状态以及它所包含的任何子控件的视图状态。Gets or sets a value indicating whether the server control persists its view state, and the view state of any child controls it contains, to the requesting client.

(继承自 Control)
Events

获取控件的事件处理程序委托列表。Gets a list of event handler delegates for the control. 此属性为只读。This property is read-only.

(继承自 Control)
Expressions

获取应用于 IDataSource 控件的表达式的集合。Gets the collection of expressions that are applied to the IDataSource control.

HasChildViewState

获取一个值,该值指示当前服务器控件的子控件是否具有任何已保存的视图状态设置。Gets a value indicating whether the current server control's child controls have any saved view-state settings.

(继承自 Control)
ID

获取或设置分配给服务器控件的编程标识符。Gets or sets the programmatic identifier assigned to the server control.

(继承自 Control)
IdSeparator

获取用于分隔控件标识符的字符。Gets the character used to separate control identifiers.

(继承自 Control)
IsChildControlStateCleared

获取一个值,该值指示该控件中包含的控件是否具有控件状态。Gets a value indicating whether controls contained within this control have control state.

(继承自 Control)
IsTrackingViewState

获取一个值,用于指示服务器控件是否会将更改保存到其视图状态中。Gets a value that indicates whether the server control is saving changes to its view state.

(继承自 Control)
IsViewStateEnabled

获取一个值,该值指示是否为该控件启用了视图状态。Gets a value indicating whether view state is enabled for this control.

(继承自 Control)
LoadViewStateByID

获取一个值,该值指示控件是否通过 ID 而不是索引参与加载其视图状态。Gets a value indicating whether the control participates in loading its view state by ID instead of index.

(继承自 Control)
NamingContainer

获取对服务器控件的命名容器的引用,此引用创建唯一的命名空间,以区分具有相同 ID 属性值的服务器控件。Gets a reference to the server control's naming container, which creates a unique namespace for differentiating between server controls with the same ID property value.

(继承自 Control)
Page

获取对包含服务器控件的 Page 实例的引用。Gets a reference to the Page instance that contains the server control.

(继承自 Control)
Parent

获取对页 UI 层次结构中服务器控件的父控件的引用。Gets a reference to the server control's parent control in the page control hierarchy.

(继承自 Control)
RenderingCompatibility

获取一个值,该值指定呈现的 HTML 将与之兼容的 ASP.NET 版本。Gets a value that specifies the ASP.NET version that rendered HTML will be compatible with.

(继承自 Control)
Site

获取容器信息,该容器在呈现于设计图面上时承载当前控件。Gets information about the container that hosts the current control when rendered on a design surface.

(继承自 Control)
SkinID

获取或设置要应用于控件的外观。Gets or sets the skin to apply to the control.

(继承自 Control)
TargetControlID

获取或设置用于查询的 IDataSource 控件的 ID。Gets or sets the ID of the IDataSource control to use for the query.

TemplateControl

获取或设置对包含该控件的模板的引用。Gets or sets a reference to the template that contains this control.

(继承自 Control)
TemplateSourceDirectory

获取包含当前服务器控件的 PageUserControl 的虚拟目录。Gets the virtual directory of the Page or UserControl that contains the current server control.

(继承自 Control)
UniqueID

获取服务器控件的唯一的、以分层形式限定的标识符。Gets the unique, hierarchically qualified identifier for the server control.

(继承自 Control)
ValidateRequestMode

获取或设置指示控件是否检查来自浏览器的客户端输入是否具有潜在危险值的值。Gets or sets a value that indicates whether the control checks client input from the browser for potentially dangerous values.

(继承自 Control)
ViewState

获取状态信息的字典,这些信息使您可以在同一页的多个请求间保存和还原服务器控件的视图状态。Gets a dictionary of state information that allows you to save and restore the view state of a server control across multiple requests for the same page.

(继承自 Control)
ViewStateIgnoresCase

获取一个值,该值指示 StateBag 对象是否不区分大小写。Gets a value that indicates whether the StateBag object is case-insensitive.

(继承自 Control)
ViewStateMode

获取或设置此控件的视图状态模式。Gets or sets the view-state mode of this control.

(继承自 Control)
Visible

获取或设置一个值,该值指示服务器控件是否作为 UI 呈现在页上。Gets or sets a value that indicates whether a server control is rendered as UI on the page.

(继承自 Control)

方法

AddedControl(Control, Int32)

在子控件添加到 Controls 对象的 Control 集合后调用。Called after a child control is added to the Controls collection of the Control object.

(继承自 Control)
AddParsedSubObject(Object)

通知服务器控件,分析了一个元素(XML 或 HTML),并将该元素添加到服务器控件的 ControlCollection 对象中。Notifies the server control that an element, either XML or HTML, was parsed, and adds the element to the server control's ControlCollection object.

(继承自 Control)
ApplyStyleSheetSkin(Page)

将页样式表中定义的样式属性应用到控件。Applies the style properties defined in the page style sheet to the control.

(继承自 Control)
BeginRenderTracing(TextWriter, Object)

开始输出数据的设计时追踪。Begins design-time tracing of rendering data.

(继承自 Control)
BuildProfileTree(String, Boolean)

收集有关服务器控件的信息并将该信息发送到 Trace 属性,在启用页的跟踪功能时将显示该属性。Gathers information about the server control and delivers it to the Trace property to be displayed when tracing is enabled for the page.

(继承自 Control)
ClearCachedClientID()

将缓存的 ClientID 值设置为 nullSets the cached ClientID value to null.

(继承自 Control)
ClearChildControlState()

删除服务器控件的子控件的控件状态信息。Deletes the control-state information for the server control's child controls.

(继承自 Control)
ClearChildState()

删除服务器控件的所有子控件的视图状态和控件状态信息。Deletes the view-state and control-state information for all the server control's child controls.

(继承自 Control)
ClearChildViewState()

删除服务器控件的所有子控件的视图状态信息。Deletes the view-state information for all the server control's child controls.

(继承自 Control)
ClearEffectiveClientIDMode()

将当前控件实例和任何子控件的 ClientIDMode 属性设置为 InheritSets the ClientIDMode property of the current control instance and of any child controls to Inherit.

(继承自 Control)
CreateChildControls()

由 ASP.NET 页框架调用,以通知服务器控件在准备回发或呈现时使用基于撰写的实现来创建其所包含任何子控件。Called by the ASP.NET page framework to notify server controls that use composition-based implementation to create any child controls they contain in preparation for posting back or rendering.

(继承自 Control)
CreateControlCollection()

创建一个新 ControlCollection 对象来保存服务器控件的子控件(包括文本控件和服务器控件)。Creates a new ControlCollection object to hold the child controls (both literal and server) of the server control.

(继承自 Control)
DataBind()

将数据源绑定到调用的服务器控件及其所有子控件。Binds a data source to the invoked server control and all its child controls.

(继承自 Control)
DataBind(Boolean)

将数据源绑定到调用的服务器控件及其所有子控件,同时可以选择引发 DataBinding 事件。Binds a data source to the invoked server control and all its child controls with an option to raise the DataBinding event.

(继承自 Control)
DataBindChildren()

将数据源绑定到服务器控件的子控件。Binds a data source to the server control's child controls.

(继承自 Control)
Dispose()

使服务器控件得以在从内存中释放之前执行最后的清理操作。Enables a server control to perform final clean up before it is released from memory.

(继承自 Control)
EndRenderTracing(TextWriter, Object)

结束输出数据的设计时追踪。Ends design-time tracing of rendering data.

(继承自 Control)
EnsureChildControls()

确定服务器控件是否包含子控件。Determines whether the server control contains child controls. 如果不包含,则创建子控件。If it does not, it creates child controls.

(继承自 Control)
EnsureID()

为尚未分配标识符的控件创建标识符。Creates an identifier for controls that do not have an identifier assigned.

(继承自 Control)
Equals(Object)

确定指定对象是否等于当前对象。Determines whether the specified object is equal to the current object.

(继承自 Object)
FindControl(String)

在当前的命名容器中搜索带指定 id 参数的服务器控件。Searches the current naming container for a server control with the specified id parameter.

(继承自 Control)
FindControl(String, Int32)

使用指定的 idpathOffset 参数(该参数有助于搜索)中指定的整数在当前命名容器中搜索服务器控件。Searches the current naming container for a server control with the specified id and an integer, specified in the pathOffset parameter, which aids in the search. 不应重写此版本的 FindControl 方法。You should not override this version of the FindControl method.

(继承自 Control)
Focus()

为控件设置输入焦点。Sets input focus to a control.

(继承自 Control)
GetDesignModeState()

获取控件的设计时数据。Gets design-time data for a control.

(继承自 Control)
GetHashCode()

用作默认哈希函数。Serves as the default hash function.

(继承自 Object)
GetRouteUrl(Object)

获取与一组路由参数对应的 URL。Gets the URL that corresponds to a set of route parameters.

(继承自 Control)
GetRouteUrl(RouteValueDictionary)

获取与一组路由参数对应的 URL。Gets the URL that corresponds to a set of route parameters.

(继承自 Control)
GetRouteUrl(String, Object)

获取与一组路由参数以及某个路由名称对应的 URL。Gets the URL that corresponds to a set of route parameters and a route name.

(继承自 Control)
GetRouteUrl(String, RouteValueDictionary)

获取与一组路由参数以及某个路由名称对应的 URL。Gets the URL that corresponds to a set of route parameters and a route name.

(继承自 Control)
GetType()

获取当前实例的 TypeGets the Type of the current instance.

(继承自 Object)
GetUniqueIDRelativeTo(Control)

返回指定控件的 UniqueID 属性的前缀部分。Returns the prefixed portion of the UniqueID property of the specified control.

(继承自 Control)
HasControls()

确定服务器控件是否包含任何子控件。Determines if the server control contains any child controls.

(继承自 Control)
HasEvents()

返回一个值,该值指示是否为控件或任何子控件注册事件。Returns a value indicating whether events are registered for the control or any child controls.

(继承自 Control)
IsLiteralContent()

确定服务器控件是否只包含文字内容。Determines if the server control holds only literal content.

(继承自 Control)
LoadControlState(Object)

SaveControlState() 方法保存的上一个页请求还原控件状态信息。Restores control-state information from a previous page request that was saved by the SaveControlState() method.

(继承自 Control)
LoadViewState(Object)

加载必须保持的 QueryExtender 控件中的值的状态。Loads the state of the values in the QueryExtender control that must be persisted.

MapPathSecure(String)

检索虚拟路径(绝对的或相对的)映射到的物理路径。Retrieves the physical path that a virtual path, either absolute or relative, maps to.

(继承自 Control)
MemberwiseClone()

创建当前 Object 的浅表副本。Creates a shallow copy of the current Object.

(继承自 Object)
OnBubbleEvent(Object, EventArgs)

确定服务器控件的事件是否沿页的 UI 服务器控件层次结构向上传递。Determines whether the event for the server control is passed up the page's UI server control hierarchy.

(继承自 Control)
OnDataBinding(EventArgs)

引发 DataBinding 事件。Raises the DataBinding event.

(继承自 Control)
OnInit(EventArgs)

初始化 QueryExtender 类的新实例后发生。Occurs when a new instance of the QueryExtender class is initialized.

OnLoad(EventArgs)

引发 Load 事件。Raises the Load event.

(继承自 Control)
OnPreRender(EventArgs)

引发 PreRender 事件。Raises the PreRender event.

(继承自 Control)
OnUnload(EventArgs)

引发 Unload 事件。Raises the Unload event.

(继承自 Control)
OpenFile(String)

获取用于读取文件的 StreamGets a Stream used to read a file.

(继承自 Control)
RaiseBubbleEvent(Object, EventArgs)

将所有事件源及其信息分配给控件的父级。Assigns any sources of the event and its information to the control's parent.

(继承自 Control)
RemovedControl(Control)

Controls 对象的 Control 集合移除子控件后调用。Called after a child control is removed from the Controls collection of the Control object.

(继承自 Control)
Render(HtmlTextWriter)

将服务器控件内容发送到给定的 HtmlTextWriter 对象,该对象可编写将在客户端呈现的内容。Sends server control content to a provided HtmlTextWriter object, which writes the content to be rendered on the client.

(继承自 Control)
RenderChildren(HtmlTextWriter)

将服务器控件子级的内容输出到提供的 HtmlTextWriter 对象,该对象可写入要在客户端上呈现的内容。Outputs the content of a server control's children to a provided HtmlTextWriter object, which writes the content to be rendered on the client.

(继承自 Control)
RenderControl(HtmlTextWriter)

将服务器控件内容输出到所提供的 HtmlTextWriter 对象,如果启用了跟踪,则还将存储有关该控件的跟踪信息。Outputs server control content to a provided HtmlTextWriter object and stores tracing information about the control if tracing is enabled.

(继承自 Control)
RenderControl(HtmlTextWriter, ControlAdapter)

使用提供的 HtmlTextWriter 对象将服务器控件内容输出到提供的 ControlAdapter 对象。Outputs server control content to a provided HtmlTextWriter object using a provided ControlAdapter object.

(继承自 Control)
ResolveAdapter()

获取负责呈现指定控件的控件适配器。Gets the control adapter responsible for rendering the specified control.

(继承自 Control)
ResolveClientUrl(String)

获取浏览器可以使用的 URL。Gets a URL that can be used by the browser.

(继承自 Control)
ResolveUrl(String)

将 URL 转换为在请求客户端可用的 URL。Converts a URL into one that is usable on the requesting client.

(继承自 Control)
SaveControlState()

保存将页面回发到服务器之后发生的所有服务器控件状态更改。Saves any server control state changes that have occurred since the time the page was posted back to the server.

(继承自 Control)
SaveViewState()

保存 QueryExtender 控件的当前视图状态。Saves the current view state of the QueryExtender control.

SetDesignModeState(IDictionary)

为控件设置设计时数据。Sets design-time data for a control.

(继承自 Control)
SetRenderMethodDelegate(RenderMethod)

分配事件处理程序委托,以将服务器控件及其内容呈现到父控件中。Assigns an event handler delegate to render the server control and its content into its parent control.

(继承自 Control)
SetTraceData(Object, Object)

使用跟踪数据键和跟踪数据值,为呈现数据的设计时追踪设置跟踪数据。Sets trace data for design-time tracing of rendering data, using the trace data key and the trace data value.

(继承自 Control)
SetTraceData(Object, Object, Object)

使用跟踪对象、跟踪数据键和跟踪数据值,为呈现数据的设计时追踪设置跟踪数据。Sets trace data for design-time tracing of rendering data, using the traced object, the trace data key, and the trace data value.

(继承自 Control)
ToString()

返回表示当前对象的字符串。Returns a string that represents the current object.

(继承自 Object)
TrackViewState()

跟踪 QueryExtender 控件的视图状态更改,以使这些更改可以存储在该控件的 StateBag 对象中。Tracks view-state changes of the QueryExtender control so that the changes can be stored in the StateBag object for the control.

事件

DataBinding

当服务器控件绑定到数据源时发生。Occurs when the server control binds to a data source.

(继承自 Control)
Disposed

当从内存释放服务器控件时发生,这是请求 ASP.NET 页时服务器控件生存期的最后阶段。Occurs when a server control is released from memory, which is the last stage of the server control lifecycle when an ASP.NET page is requested.

(继承自 Control)
Init

当服务器控件初始化时发生;初始化是控件生存期的第一步。Occurs when the server control is initialized, which is the first step in its lifecycle.

(继承自 Control)
Load

当服务器控件加载到 Page 对象中时发生。Occurs when the server control is loaded into the Page object.

(继承自 Control)
PreRender

在加载 Control 对象之后、呈现之前发生。Occurs after the Control object is loaded but prior to rendering.

(继承自 Control)
Unload

当服务器控件从内存中卸载时发生。Occurs when the server control is unloaded from memory.

(继承自 Control)

显式接口实现

IControlBuilderAccessor.ControlBuilder

有关此成员的说明,请参阅 ControlBuilderFor a description of this member, see ControlBuilder.

(继承自 Control)
IControlDesignerAccessor.GetDesignModeState()

有关此成员的说明,请参阅 GetDesignModeState()For a description of this member, see GetDesignModeState().

(继承自 Control)
IControlDesignerAccessor.SetDesignModeState(IDictionary)

有关此成员的说明,请参阅 SetDesignModeState(IDictionary)For a description of this member, see SetDesignModeState(IDictionary).

(继承自 Control)
IControlDesignerAccessor.SetOwnerControl(Control)

有关此成员的说明,请参阅 SetOwnerControl(Control)For a description of this member, see SetOwnerControl(Control).

(继承自 Control)
IControlDesignerAccessor.UserData

有关此成员的说明,请参阅 UserDataFor a description of this member, see UserData.

(继承自 Control)
IDataBindingsAccessor.DataBindings

有关此成员的说明,请参阅 DataBindingsFor a description of this member, see DataBindings.

(继承自 Control)
IDataBindingsAccessor.HasDataBindings

有关此成员的说明,请参阅 HasDataBindingsFor a description of this member, see HasDataBindings.

(继承自 Control)
IExpressionsAccessor.Expressions

有关此成员的说明,请参阅 ExpressionsFor a description of this member, see Expressions.

(继承自 Control)
IExpressionsAccessor.HasExpressions

有关此成员的说明,请参阅 HasExpressionsFor a description of this member, see HasExpressions.

(继承自 Control)
IParserAccessor.AddParsedSubObject(Object)

有关此成员的说明,请参阅 AddParsedSubObject(Object)For a description of this member, see AddParsedSubObject(Object).

(继承自 Control)

扩展方法

FindDataSourceControl(Control)

返回与指定控件的数据控件关联的数据源。Returns the data source that is associated with the data control for the specified control.

FindFieldTemplate(Control, String)

返回指定控件的命名容器中指定列的字段模板。Returns the field template for the specified column in the specified control's naming container.

FindMetaTable(Control)

返回包含数据控件的元表对象。Returns the metatable object for the containing data control.

适用于

另请参阅