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Web Part Security
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Web parts are a bit like building blocks; users can build whatever they like with them However, left unchecked, users can potentially build resource-hogging monstrosities that can kill a site for all other users To prevent this and to give administrators some control over the web parts that can be included on a page, SharePoint requires that all controls be registered as safe before they are allowed to be included Safe controls are specified using a series of SafeControl elements within the site s webconfig file In addition to requiring controls to be explicitly specified as safe for a given site, web parts can also make use of code access security to restrict the actions of web part code even more
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User Interface Customization
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Creating a Web Part
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To demonstrate how web parts can be created and used within a SharePoint page, let s work through an example We ll create a simple web part that accepts two property values: a color and the name of a SharePoint list The web part will display a list of items in the list using the selected colors Although this is a trivial example, it will illustrate the key elements that are used when building more useful web parts 1 In Visual Studio, choose File | New | Project In the New Project dialog, select Empty SharePoint Project Name the project 7WebPart, as shown:
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2 Set the local site to use for debugging to the demo site that we created earlier (http://<server name>/sites/Section1) and select the Deploy As Farm Solution option 3 Choose Project | Add New Item In the Add New Item dialog, select Web Part Name the web part DemoWebPart 4 In the file DemoWebPartcs, add the following code:
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[ToolboxItemAttribute(false)] public class DemoWebPart : SystemWebUIWebControlsWebPartsWebPart { private ColorEnum _textColor = ColorEnumBlack; private string _listName = stringEmpty; public enum ColorEnum { Red, Green, Blue, Black, White }
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Part II
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PART II
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Presentation Layer
[Personalizable(true), WebBrowsable(true), WebDescription("Select the font color used to display text"), WebDisplayName("Text Color") , SPWebCategoryName("Color")] public ColorEnum TextColor { get { return _textColor; } set { _textColor = value; } } [Personalizable(true), WebBrowsable(true), WebDescription("Select the list name from which text will be retrieved"), WebDisplayName("List Name")] public string ListName { get { return _listName; } set { _listName = value; } } protected override void CreateChildControls() { HtmlGenericControl div = new HtmlGenericControl("div"); SPList list=SPContextCurrentWebListsTryGetList(ListName); if (list != null) { SPQuery query = new SPQuery(); queryRowLimit = 50; SPListItemCollection items = listGetItems(query); StringBuilder sb = new StringBuilder(); sbAppend("<ul style=\"color:" + SystemEnumGetName(typeof(ColorEnum), TextColor) + "\";>"); foreach (SPListItem item in items) { sbAppend("<li>" + itemTitle + "</li>"); } sbAppend("</ul>"); } divInnerHtml = sbToString();
7
else { divInnerHtml = "List not found"; } thisControlsAdd(div); } }
User Interface Customization
5 To see how the web part works on a page, select Deploy 7WebPart from the Build menu 6 In the browser, navigate to the home page of the demo site that we set up earlier, and then choose Site Actions | Edit Page From the Insert tab on the ribbon, select Web Part 7 From the Custom category, select DemoWebPart, and then click Add:
8 Since we haven t configured a list, the web part will display List not found To edit the web part properties, right-click the arrow to the right of the web part and select Edit Web Part from the context menu, as shown:
Part II
We re querying the configured list and creating an unordered list of the title of the top 50 items Notice that the attributes that are applied to the TextColor and ListName properties For the property to be visible in the Property Editor pane, WebBrowsable must be set to true
PART II
Presentation Layer
9 Our custom properties appear in the Color section and the Miscellaneous section, as configured by the attributes that we applied to the properties By placing the cursor over the property name, you ll see the description text that we added as a tooltip In the List Name text box, enter Web Part Gallery as the name of the list, and then click OK
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