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Figure 8-5. Complex binding to a DataView To make this work, you use two properties. The DataSource property is exposed by every control that uses complex binding. It accepts the data object, which must implement IList or one of its derived interfaces, as described earlier. The DisplayMember property names the field name that you want to display. The DisplayMember property is required in simple list controls, because they can show only one piece of information at a time. In this example, the code appears to bind to a DataTable object, but it actually binds to the DataTable.DefaultView property. This property provides a DataView object that implements the required IList interface. For the most part, you can ignore this lower-level reality unless you want to use the DataView object to customize the displayed data. For example, the code that follows doesn t change the actual information in the DataTable, but it does ensure that only a subset of it will be shown in the list control:

Note If you enter an incorrect password, or you don t enter a password in the two boxes, you receive an

DataTable dt = Program.StoreDB.GetProducts(); // Only include rows with a UnitCost value less than 5. dt.DefaultView.RowFilter = "UnitCost < 5"; lstModelName.DataSource = dt; lstModelName.DisplayMember = "ModelName"; Figure 8-6 shows the filtered list.

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Imagine instead of displaying the types of a tuple that you wanted to display the values that make up the tuple. To do this, you would use reflection over values, and you would need to use the function FSharpValue.GetTupleFields to get an array of objects that are the values that make up the tuple. These objects could be tuples, or other F# types, so you could recursively call the function to print out the objects value. However, in this case, you know there are fundamental values from the BCL library, so you simply use the F# printfn function to print them out. The F# printf module is described later in the chapter. The following example implements such a function:

Figure 8-6. Binding to a filtered DataView The DataView class provides other properties that allow you to implement sorting, and to specify whether the data-bound collection allows deletions, additions, and modifications (which don t apply to the list control because it never allows the modification of a bound data source). Taken together, these options (listed in Table 8-1) provide an extra layer of indirection that allows your code to be more flexible.

A string that allows you to filter the results based on any field. This string works like a tiny snippet of SQL code, meaning that string values must be enclosed in single quotes, and you can use the operators like =, <, and >. A combination of the values from DataViewRowState enumeration. This allows you to display rows that have been scheduled for deletion in the DataSet pending the next update (deleted rows are usually hidden). Allows you to configure the sort order for the DataView. You can enter a combination of columns, separated by commas (as in "CategoryID, ModelName"). Append a space and the letters DESC after a column name to indicate descending (reverse) sort order. The DataTable object that contains the data used by this DataView.

error stating that the parameter is incorrect. Don t worry; enter the passwords again in the relevant boxes and click Retry.

open Microsoft.FSharp.Reflection let printTupleValues (x: obj) = if FSharpType.IsTuple(x.GetType()) then let vals = FSharpValue.GetTupleFields x printf "(" vals |> Seq.iteri (fun i v -> if i <> Seq.length vals - 1 then printf " %A, " v else printf " %A" v) printfn " )" else printfn "not a tuple" printTupleValues ("hello world", 1) The result of this code, when compiled and executed, is as follows:

Tip As you might imagine, you can even create multiple DataView objects, allowing you to show data from

You also can bind through a DataSet instead of the DataTable. In this case, you need to supply the table name and the field name for the DisplayMember property, as shown here: lstModelName.DataSource = ds; lstModelName.DisplayMember = "Products.ModelName"; The end result is the same, but a DataSet.DefaultViewManager is used for the data binding. This property contains a DataViewManager object for the entire DataSet.

Binding to a Grid (Complex Binding)

6. Your password on the Windows computer will then be changed for you, and you should see a confirmation of this event, as shown in Figure 6-27. Click Close to finish.

( "hello world", 1 )

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