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Part VII: Developing Web Parts in Visual Studio .NET
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As Figure 20-1 illustrated, the output of the SiteLinks Web Part is a two-column HTML table. In most rows, the left column identifies the type of site, and the right column displays a clickable site name. For clarity, however, some rows display separator lines that span both columns. A different custom method will create each of these row types.
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Is the method that formats normal table rows. It accepts these six
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A pointer to the HTML table that will contain the new row. The type of site, such as Portal, Root, Home, or Subweb. (Home designates the home page of the current site.) The site s URL. The site s title, as a team member would specify under Site Settings, Change Site Title and Description. The AddTblRow method uses this as the hyperlink text.
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The position where the new row should reside. If this argument is negative, the method adds a row to the end of the table. If the argument is positive, the new row appears after the given position, and ahead of any existing rows. (Suppose, for example, that the table contains 6 rows. Inserting a row after position 4 would place it in position 5, and the former rows 5 and 6 would occupy positions 6 and 7.)
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AddTblSeparator
Is the method that formats separator rows. It accepts one argument: a pointer to the HTML table that will contain the new row. Furthermore, it takes care not to display a separator in either of these conditions:
The separator would be the first row in the table. The separator would immediately follow an existing separator.
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Including these provisions in the AddTblSeparator method simplifies program logic elsewhere. Later sections will explain how to develop the AddTblRow and AddTblSeparator methods. For now, return to the CreateChildControls override method and proceed as follows.
1 Create a new HtmlTable object named tblGrid that displays no cell padding. In other words, add the following statements after the code from the previous section.
HtmlTable tblGrid = new HtmlTable(); tblGrid.CellPadding = 0;
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The site s name, which is normally the relative path from its top-level site. If the site s title is blank, the AddTblRow method uses this argument as the hyperlink text.
Part VII: Developing Web Parts in Visual Studio .NET
Microsoft Windows SharePoint Services Inside Out
2 If an administrator has configured a site collection to connect with a portal site, the portal s URL and name will appear in the SPSite object s PortalUrl and PortalName properties. So, if the root collection s PortalUrl is non-blank, display a link to the given portal site, and then a separator line.
if (spsRoot.PortalUrl != "") { AddTblRow(tblGrid, "Portal", spsRoot.PortalUrl, spsRoot.PortalName, spsRoot.PortalName, -1); AddTblSeparator(tblGrid); }
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Note that this code uses the AddTblRow and AddTblSeparator methods just explained. The code specifies spsRoot.PortalName for both the title and name arguments because there s no such property as spsRoot.PortalTitle.
3 Display a link to the virtual server s root site, but only if the root site is different from the current site. (Later code will display the current site.)
if (spwCurr.ID != spsRoot.RootWeb.ID) { AddTblRow(tblGrid, "Root", spsRoot.Url, spsRoot.RootWeb.Title, spsRoot.RootWeb.Name, -1); }
Recall that Windows SharePoint Services assigns a unique ID value to each site it creates. Thus, if the ID properties of two SPWeb objects are different, they represent different sites.
4 If the current top-level site isn t the top-level site at the server s root (that is, if the values of the spwTpLv.ID and spsRoot.RootWeb.ID properties are unequal), then display links to the current collection s portal site (if any) and to the current collection s top-level site. This requires the following code, next in sequence.
if (spwTpLv.ID != spsRoot.RootWeb.ID){ if (spsColl.PortalUrl != "") { AddTblRow(tblGrid, "Portal", spsColl.PortalUrl, spsColl.PortalName, spsColl.PortalName, -1); AddTblSeparator(tblGrid); } if (spwCurr.ID != spwTpLv.ID) { AddTblRow(tblGrid, "Top", spwTpLv.Url, spwTpLv.Title, spwTpLv.Name, -1); } }
The code within the if statement basically repeats that in steps 1 and 2, except that is specifies spsColl rather than spsRoot, and spwTpLv rather than spsRoot.RootWeb.
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