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using Microsoft.SharePoint.WebControls; using System.Web.UI.HtmlControls;
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6 If the site contains any SharePoint lists but the ddlLists drop-down list is empty, iterate through the site s Lists collection and create a drop-down list item for each SharePoint list. Then, select the drop-down list s first item and configure the drop-down list to immediately submit the form whenever the visitor changes the selection. Finally, call a method named DisplayList, which displays the contents of the current list. All together, this requires the code shown below in bold.
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protected override void CreateChildControls () { spwCurr = SPControl.GetContextWeb(Context); ddlLists = new DropDownList(); ddlLists.SelectedIndexChanged += new EventHandler(ListsChange); Controls.Add(ddlLists); if ((spwCurr.Lists.Count > 0) && (ddlLists.Items.Count < 1)) { foreach (SPList list in spwCurr.Lists) { ddlLists.Items.Add(new ListItem(list.Title)); } ddlLists.SelectedIndex=0;
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Part VII: Developing Web Parts in Visual Studio .NET
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ddlLists.AutoPostBack = true; DisplayList(); } }
Once the drop-down list is loaded with list names, the ASP.NET ViewState mechanism will restore the values during each subsequent execution. This explains why the dropdown list might contain items immediately after you create it.
7 The ListsChange event handler will run whenever a team member changes the selection in the drop-down list. At that point, the event handler needs to refresh the display, using the same method that created the original display. To do this, add the following code within the ListBrowser class but outside any other method or structure:
private void ListsChange (object sender, EventArgs e) { DisplayList(); }
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8 Declare the DisplayList method, again within the ListBrowser class but outside any other method or structure. Also declare a variable that will point to an ASP.NET DataGrid object.
private void DisplayList() { DataGrid grdCurList; // Code to create and load the DataGrid will go here. }
9 Replace the comment in step 8 with code that makes sure the CreateChildControls method has finished running, and that creates an SPList object that points to the selected list.
EnsureChildControls(); SPList splCurList = spwCurr.Lists[ddlLists.SelectedItem.Text];
To understand the second statement, recall that:
The spwCurr variable points to an SPWeb object that describes the current site. The Lists collection of an SPWeb object includes an SPList object for each list. By design in step 6, each item in the ddlLists drop-down list (including the selected item) contains the name of a list.
10 Create a generic paragraph tag with a zero margin, make it display the number of items in the current list, and add it to the Web Part s Controls collection for eventual output. In other words, add the following code next in sequence.
HtmlGenericControl parCount = new HtmlGenericControl("p"); parCount.Style.Add("margin", "0"); parCount.InnerText = splCurList.Items.Count + " items."; Controls.Add(parCount);
Part VII: Developing Web Parts in Visual Studio .NET
Creating Basic Web Parts
11 If the list contains any items, establish a pointer named licCurList that points to the list s Items collection. Then, create a DataGrid object and set its visual properties. Finally, render the list s Items collection as an ASP.NET DataTable, assign the DataTable as the DataGrid s data source, bind the data into the DataGrid, and add the DataGrid to the Web Part s Controls collection. Here s the code.
if (splCurList.Items.Count > 0) { SPListItemCollection licCurList = splCurList.Items; grdCurList = new DataGrid(); grdCurList.BorderWidth = 0; grdCurList.CellSpacing = 0; grdCurList.CellPadding = 2; grdCurList.HeaderStyle.CssClass = "ms-vh2"; grdCurList.ItemStyle.CssClass = "ms-vb2"; grdCurList.AlternatingItemStyle.CssClass = "ms-vb2 ms-alternating"; grdCurList.EnableViewState = false; grdCurList.DataSource = licCurList.GetDataTable(); grdCurList.DataBind(); Controls.Add(grdCurList); } }
The CSS class names ms-vh2, ms-vb2, and ms-alternating are all standard elements of SharePoint style sheets. This ensures that the Web Part s appearance will always match that of the surrounding site. Because the GetDataTable method creates an ADO.NET DataTable, it needs methods from the System.Data namespace. Therefore, add the following reference to the list of using statements at the top of the source file.
using System.Data;
12 Change the template-provided RenderWebPart method to agree with the following. As in previous examples, this sends the browser the HTML from all the objects in the Web Part s Controls collection.
protected override void RenderWebPart(HtmlTextWriter output) { RenderChildren(output); }
You can find the complete code for this example in the List Browser.cs class in the \WebParts\WssIso project on the companion CD. To build, install, and test the Web Part, follow the same procedures you used earlier for the Welcome Web Part.
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