11: Adding Client Capabilitie s to Ser ver Controls Using the A SPNET AJA X Control Toolkit in VS .NET

Creation EAN / UCC - 13 in VS .NET 11: Adding Client Capabilitie s to Ser ver Controls Using the A SPNET AJA X Control Toolkit
11: Adding Client Capabilitie s to Ser ver Controls Using the A SPNET AJA X Control Toolkit
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reasons to switch get greater The use of the toolkit can be compared to the use of the ActiveX Template Library (ATL) that was used to create ActiveX controls in C++ The template provided a ton of base classes and Visual Studio templates that made creating them a lot easier
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Figure 113 Extender Control Wizard
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Adding Design-Time Support to Your Extender Control
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The introduction of the Extender Wizard in Visual Studio 2008 has enhanced the design-time experience with regard to working with extender controls, and this section explains how to add design-time features of your own to give your controls that professional feel that users have become accustomed to
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Adding De sign-Time Support to Your Extender Control
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Default Design-Time Experience The ImageRotatorDesigner class shown in Listing 112 provides everything we need to get a basic design-time experience for our extender control The ExenderControlBaseDesigner<T> that it inherits from makes it possible for the properties of our extender control to show up in the Properties window while the design-time focus is on the image control we are extending Figure 114 shows the RotationInterval and ImageList properties that appear in the Properties window while the image control has focus in the designer This default feature addresses one issue, which is being able to work with the ImageRotator properties in an integrated way, but still does not address the issue of data entry for the properties themselves and how that experience can be enhanced
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Figure 114 Extender properties on the image control
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11: Adding Client Capabilitie s to Ser ver Controls Using the A SPNET AJA X Control Toolkit
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Adding Designers and Editors to Properties In this section, we look at how to extend the design-time behavior of our ImageRotator ImageList property The ImageList property that we worked with in 5 was rudimentary and prone to errors as a user entered in the values In this version of the extender, we want to extend the functionality to support design-time editing and HTML source editing The road to these modi cations requires a few steps as we add the functionality:
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1 Add attributes to the class 2 Add attributes to the property 3 Add editors to assist in assigning values 4 Create a type converter to support serialization
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Add Attributes to the Class
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Most users expect when adding multiple entries to a control to be able to add them in the body of the HTML element This is the experience we have when adding web service references or script references to the Script Manager and one we want to have in our control The ParseChildren attribute enables us to add multiple entries inside our ImageRotator HTML tag and treat those entries as a single property assignment By setting the ChildrenAsProperties property to true and the DefaultProperty to ImageList, as in Listing 116, we are effectively telling the designer that we want to have all the items contained in the body of our ImageRotator tag parsed and assigned to the ImageList property The HTML fragment in Listing 117 shows what this looks like when the HTML editor is opened and the ImageRotator tag has entries
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Listing 116 ParseChildren Attribute Assignment
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[ParseChildren(true, "ImageList")] public class ImageRotatorExtender : ExtenderControlBase { }
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Adding De sign-Time Support to Your Extender Control
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Listing 117 ImageList Assignment in HTML
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<asp:Image ID="BannerImage" runat="server" ImageUrl="~/images/1jpg" /> <cc2:ImageRotatorExtender ID="BannerImage_ImageRotatorExtender" runat="server" Enabled="True" TargetControlID="BannerImage"> <cc2:ImageUrl Url="~/images/2jpg" /> <cc2:ImageUrl Url="~/images/3jpg" /> <cc2:ImageUrl Url="~/images/4jpg" /> </cc2:ImageRotatorExtender>
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NOTE
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ASPNET Server Control Designer References
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The addition of designer features to your extenders requires some knowledge of how designers work MSDN has some great information about this at http://msdn2microsoftcom/en-us/ library/aa719973%28VS71%29aspx that covers adding design-time support to ASPNET server controls
Add Attributes to the Property
To fully implement the ability to add nested image entries to our Image Rotator extender, we need to add a couple of attributes, as shown in Listing 118, to our ImageList property, which provides hooks for the designer to integrate with our property and properly assign the image values The DesignerSerializationVisibility attribute is added to the property to ensure that the designer will serialize the contents of the property during design time The setting of DesignerSerializationVisibility Content instructs the designer to generate code for the contents of the tag and not the tag itself The PersistenceMode attribute is the other piece to this puzzle and is responsible for adding the <ImageUrl /> entries inside our ImageRotator tag as we add values to the property in the Properties window The setting of PersistenceModeInnerProperty speci es that the property is persisted as a nested tag inside the ImageRotator, as shown in Listing 117