qr code generator for c# public class RssWebPart : WebPart, IWebEditable in Visual C#

Printer QR Code ISO/IEC18004 in Visual C# public class RssWebPart : WebPart, IWebEditable

public class RssWebPart : WebPart, IWebEditable
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This interface exposes one property and one method and tells SharePoint and ASP.NET that this control exposes custom Editor Parts. The property is called
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Custom Editor Parts
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WebBrowsableObject and should return a reference to the Web Part or control that s going to be edited by the Editor Part controls. The method called CreateEditorParts returns a collection of EditorPart controls. A Web Part can have several Editor Parts,
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which can be useful if you want to group or organize your configuration for a better user experience. To see how a class or interface is defined, you can use Visual Studio to show you the definition by selecting the class or interface. Then press the F12 key or right-click and select Go To Definition. If you do this on IWebEditable in your Web Part class definition, you ll see the definition of the property and method.
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To implement the property and method, right-click on IWebEditable in your class definition and select Implement Interface > Implement Interface Explicitly. Visual Studio will then create the implementation of the interface at the end of your Web Part source code file. Listing 5.8 shows how the WebBrowsableObject property returns the Web Part object. As you can see, the CreateEditorParts creates a collection of Editor Parts and returns the collection.
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Listing 5.8 Implementation of the IWebEditable interface
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EditorPartCollection IWebEditable.CreateEditorParts() { List<EditorPart> editors = new List<EditorPart>(); RssWebPartEditorPart editorPart = new RssWebPartEditorPart(); editorPart.ID = this.ID + "_editorPart"; editors.Add(editorPart); return new EditorPartCollection(editors); } object IWebEditable.WebBrowsableObject { get { return this; } }
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ID must be set
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In the CreateEditorParts method, you have to create a List<EditorPart> object to add your custom Editor Parts. You have to specify a unique identifier for each Editor Part B. A good convention is to use the id of the Web Part and append _editorPart. The EditorPart object is added to the list and finally returned from the method. The WebBrowsableObject is used by the Editor Part to get a reference to the Web Part that s being edited. This method needs to return the object itself. The ASP.NET Web Part definition already exposes this interface. Instead of explicitly implementing this interface, you could just override the CreateEditorParts method. I ll show you the explicit method here so you ll see how the interface works. Now your Editor Part is associated with the Web Part. Build and deploy the solution to SharePoint so that you can add the Web Part to a page. When the Web Part
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Making Web Parts customizable
appears on the page, you can edit its properties. Your custom Editor Part will appear on the right and look like figure 5.6. In figure 5.6, you can also see that the automatically generated interface is still available. To remove the properties from that category, you need to modify the WebBrowsable attribute so that it has the value set to false or remove the attribute from the property. Once that s done, you can once again deploy your project and test the Web Part.
Validating properties You can further enhance your custom Editor Part with validation. Validation ensures that users enter a correct value to avoid error messages in the Web Parts. If you have a percentage input, you could validate the property so that its value is between 0 Figure 5.6 Adding an Editor Part to the and 100. Not only does the validation avoid unnecWeb Part allows the developer to control essary error messages, it also improves the overall the logic in the tool pane. The properties user experience. may appear both in a custom Editor Part You should use validation when it s applicaand in the default interface if the WebBrowsable attribute is present on ble, but you shouldn t rely on it. The validation the property declaration. is only used when users are editing the Web Part in the web interface using the custom Editor Part. If they re editing the Web Part in code or manually editing it with SharePoint Designer, the custom Editor Part and its validation won t be used. As usual, you always need good error handling in your Web Part. 8 explains how to implement good exception handling and error messages. In the RSS Web Part, the RSS feed URL should be validated so that it s a valid URL. You accomplish this by adding a regular expression validation control. Add the control in the CreateChildControls method, directly after adding the feed URL text box:
RegularExpressionValidator regValidator = new RegularExpressionValidator { ControlToValidate = m_feedUrl.ID, ValidationExpression = @"([^:]+)://(([^:@]+)(:([^@]+)) @) ([^:/ #]+)(:([d]+)) ([^ #]+) (\ ([^#]+)) (#(.*)) ", ErrorMessage = "Please provide a valid Url" }; this.Controls.Add(regValidator);
Because you also created a text box for entering the number of items to fetch, you have to make sure that the user is entering an integer. For that validation, add a range validator:
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