AccessDataSourceDesigner 類別

定義

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

繼承

Object

ComponentDesigner

HtmlControlDesigner

ControlDesigner

DataSourceDesigner

SqlDataSourceDesigner

AccessDataSourceDesigner

範例

本節提供兩個程式碼範例。 第一個示範如何擴展 AccessDataSourceDesigner 課程。 第二項示範如何衍生該類別的副本 AccessDataSource 並將其與設計師關聯。

以下程式碼範例示範如何擴充該 AccessDataSourceDesigner 類別。 程式碼會修改代表設計表面控制項的佔位符，並在 屬性 網格中新增屬性。

// 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

以下程式碼範例示範如何衍生該 AccessDataSource 類別的副本，並將其與前述範例中定義的設計器關聯。

// 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

備註

在視覺設計器中，當你從原始碼視圖切換到設計視圖時，描述控制項的標記原始碼 AccessDataSource 會被解析，並在設計表面建立一個設計時版本，僅作為佔位符。 當你切回原始碼視圖時，設計時控制項（包含 屬性 格子中屬性的值）會持續存在於標記原始碼，並編輯到網頁的標記中。

另請參閱

• AccessDataSource
• SqlDataSourceDesigner
• DataSourceDesigner
• ASP.NET 控制設計師簡介
• 攻略：建立網頁伺服器控制的基本控制設計器