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ADVENTURE WORKS
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At the end of chapter 1 we created a portal for Adventure Works Cycles. In that exercise we created two parts: a part to display a listing of departments, and a part to display a listing of employees. In this exercise we will apply our new knowledge of connections to join these two parts to one another, so that the employee list can be filtered by a selected department in the department list. Figure 3.15 shows how the two web parts will appear when this connection has been made. The image shows the Finance department as the selected department with the employees for that department shown in the employees list. The IT department at Adventure Works has decided that, whenever possible, we should increase the extensibility of our controls and use the standard connection interfaces that work with the pre-defined ASP.NET transformers. To do this we will ensure that the DepartmentListing web part exposes its data via the IWebPartRow provider interface, and have the EmployeeListingPart web part consume the department identifier via the IWebPartField consumer interface.
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If you don t have a copy of the project from chapter 2 you can grab it from the chapter 2 section of the resources website for this book at http://manning.com/neimke.
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Adding the provider endpoint We ll start the process of implementing the standard transformer interfaces within our application by altering the DepartmentListingPart.ascx control to make it expose a connection endpoint based on the IWebPartRow interface. Open that control
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Figure 3.15 Adding a connection between the two web parts will allow the user to make a selection in the Departments web part and have the employees for that department be automatically displayed in the Employees web part.
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in design view, and configure the GridView to allow users to select items and modify them so that the fill color of the selected row is highlighted. You can do this by adding the attributes listed in the following code to the GridView control declaration:
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AutoGenerateSelectButton="True" SelectedRowStyle-BackColor="Yellow"
Now switch the control into source code view and add the IWebPartRow interface definition to it. At this point the code for your class should look like this:
public partial class DepartmentListingPart : UserControl, IWebPartRow { public void GetRowData(RowCallback callback) { // implementation goes here } public PropertyDescriptorCollection Schema { get { // implementation goes here } } }
The Schema property requires us to return a collection of PropertyDescriptor objects for each property that we want to expose to the transformer; in other words, how many properties do we want to expose for dynamic configuration We could expose just the ID of the selected department which is all that is needed for this example; but in the future, we may create other parts that can utilize other properties of a department, such as its name or description. So let s return a PropertyDescriptor for each property of the selected Department item to keep things uncomplicated. The code to accomplish this turns out to be simple, as seen in the following listing. The TypeDescriptor class already knows how to extract these descriptors based on a type, so we can relegate the hard work to it.
public PropertyDescriptorCollection Schema { get { PropertyDescriptorCollection props = TypeDescriptor.GetProperties(typeof(Department)); return props; } }
The logic for our provider is contained within the GetRowData method. This is the method that will be called by the transformer when it needs to get the data to send to the consumer. This method is responsible for creating the data we described in our Schema property, and passing it back to the caller via the callback that is passed to the method. The code to do this follows:
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