AccessDataSourceDesigner 类

定义

public ref class AccessDataSourceDesigner : System::Web::UI::Design::WebControls::SqlDataSourceDesigner

public class AccessDataSourceDesigner : System.Web.UI.Design.WebControls.SqlDataSourceDesigner

type AccessDataSourceDesigner = class
    inherit SqlDataSourceDesigner

Public Class AccessDataSourceDesigner
Inherits SqlDataSourceDesigner

继承

Object

ComponentDesigner

HtmlControlDesigner

ControlDesigner

DataSourceDesigner

SqlDataSourceDesigner

AccessDataSourceDesigner

示例

本部分提供两个代码示例。 第一个示例演示如何扩展 AccessDataSourceDesigner 类。 第二个示例演示如何派生类的副本 AccessDataSource 并将其与设计器相关联。

下面的代码示例演示如何扩展 AccessDataSourceDesigner 类。 该代码更改在设计图面上表示控件的占位符，并将属性添加到 “属性” 网格。

// Shadow control properties with design time properties.
protected override void PreFilterProperties(IDictionary properties)
{
    // Call the base class method first.
    base.PreFilterProperties(properties);

    // Add the ConnectionString property to the property grid.
    PropertyDescriptor property =
        (PropertyDescriptor)properties["ConnectionString"];
    Attribute[] attributes = new Attribute[]
    {
        new BrowsableAttribute(true),
        new ReadOnlyAttribute(true)
    };
    properties["ConnectionString"] = TypeDescriptor.CreateProperty(
        GetType(), property, attributes);
}

' Shadow control properties with design time properties.
Protected Overrides Sub PreFilterProperties(ByVal properties As IDictionary)

    ' Call the base class method first.
    MyBase.PreFilterProperties(properties)

    ' Add the ConnectionString property to the property grid.
    Dim prop As PropertyDescriptor
    prop = CType(properties("ConnectionString"), PropertyDescriptor)

   Dim atts(1) As Attribute
    atts(0) = New BrowsableAttribute(True)
    atts(1) = New ReadOnlyAttribute(True)

    properties("ConnectionString") = TypeDescriptor.CreateProperty( _
        prop.GetType(), prop, atts)
End Sub

下面的代码示例演示如何派生 类的副本 AccessDataSource ，并将其与前面示例中定义的设计器相关联。

// Create a control and bind it to the ExampleAccessDataSourceDesigner.
[AspNetHostingPermission(System.Security.Permissions.SecurityAction.Demand,
    Level = AspNetHostingPermissionLevel.Minimal)]
[AspNetHostingPermission(System.Security.Permissions.SecurityAction.InheritanceDemand,
    Level = AspNetHostingPermissionLevel.Minimal)]
[Designer(typeof(CustomControls.Design.ExampleAccessDataSourceDesigner))]
public class ExampleAccessDataSource : AccessDataSource
{
    // Does nothing extra
}

' Create a control and bind it to the ExampleAccessDataSourceDesigner.
<AspNetHostingPermission(System.Security.Permissions.SecurityAction.Demand, _
    Level:=System.Web.AspNetHostingPermissionLevel.Minimal)> _
<AspNetHostingPermission(System.Security.Permissions.SecurityAction.InheritanceDemand, _
    Level:=System.Web.AspNetHostingPermissionLevel.Minimal)> _
<Designer("CustomControls.Design.ExampleAccessDataSourceDesigner")> _
Public Class ExampleAccessDataSource
    Inherits AccessDataSource

    ' Does nothing extra
End Class

注解

在可视化设计器中，从“源”视图切换到“设计”视图时，将分析描述控件的 AccessDataSource 标记源代码，并在设计图面上创建控件的设计时版本，该版本只是一个占位符。 切换回“源”视图时，设计时控件（包括 “属性” 网格中属性的值）将保留到标记源代码中，并编辑为网页的标记。

构造函数

属性

方法

事件

显式接口实现

适用于

另请参阅

• AccessDataSource
• SqlDataSourceDesigner
• DataSourceDesigner
• ASP.NET 控件设计器简介
• 演练：为 Web 服务器控件创建基本控件设计器