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Data Binding and the DataGridView
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The DataGridView control, unlike the controls you saw in the previous section, can display more than one column; the data must be formatted in such a way that the data grid knows which columns to display. You can achieve this in two ways. One is to bind the DataGridView to a DataTable. The other is to bind the grid to a list of objects that have properties; the various properties will become the grid s columns. Binding to a DataSet is the simpler solution, as in the next example: #light #r "Microsoft.Practices.EnterpriseLibrary.Data.dll";; open System open System.Collections.Generic open System.Data open System.Windows.Forms open Microsoft.Practices.EnterpriseLibrary.Data let database = DatabaseFactory.CreateDatabase() let dataSet = database.ExecuteDataSet (CommandType.Text, "select top 10 * from Person.Contact") let form = let temp = new Form() let grid = new DataGridView(Dock = DockStyle.Fill) temp.Controls.Add(grid) grid.DataSource <- dataSet.Tables.Item(0) temp Application.Run(form) Figure 9-3 shows the results from this example.
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Figure 9-3. A data-bound data grid An alternative to using a DataSet is to use an F# record type; to do this, you would generally create a generic function that uses reflection to create and populate your strongly typed collection. Here s an example of such a function: #light #r "Microsoft.Practices.EnterpriseLibrary.Data.dll";; open open open open open System System.Collections.Generic System.Data System.Windows.Forms Microsoft.Practices.EnterpriseLibrary.Data
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let execCommand<'a> commandString : seq<'a> = let opener() = let database = DatabaseFactory.CreateDatabase() database.ExecuteReader(CommandType.Text, commandString) let generator (reader : IDataReader) = if reader.Read() then let t = (type 'a) let props = t.GetProperties() let types = props |> Seq.map (fun x -> x.PropertyType) |> Seq.to_array let cstr = t.GetConstructor(types) let values = Array.create reader.FieldCount (new obj()) reader.GetValues(values) |> ignore
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let values = values |> Array.map (fun x -> match x with | : DBNull -> null | _ -> x) Some (cstr.Invoke(values) : > 'a) else None Seq.generate_using opener generator The first line of the sample uses a technique that you have not met before. Here you explicitly declare your function s type parameter: let execCommand<'a> commandString : seq<'a> You do this so you can explicitly give the generic argument 'a. This is used later in the function to create a type object that you then reflect over: let t = (type 'a) The function is designed to work with an F# record type, whose fields exactly match the fields resulting from the query. If this precondition is not met, then the code will fail, but such preconditions are typical in applications that use reflection in this way. The function execCommand you have defined is generic and can be used with any query and matching record type. The following example shows how to apply it: type Contact = { ContactID : Nullable<int> ; NameStyle : Nullable<bool> ; Title : string ; FirstName : string ; MiddleName : string ; LastName : string ; Suffix : string ; EmailAddress : string ; EmailPromotion : Nullable<int> ; Phone: string ; PasswordHash : string ; PasswordSalt : string ; AdditionalContactInfo : string ; rowguid : Nullable<Guid> ; ModifiedDate : Nullable<DateTime> ; }
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let form = let temp = new Form() let grid = new DataGridView(Dock = DockStyle.Fill) temp.Controls.Add(grid) let contacts = execCommand<Contact> "select top 10 * from Person.Contact" let contactsArray = contacts |> Seq.to_array grid.DataSource <- contactsArray temp Application.Run(form) The most important point is as follows: let contacts = execCommand<Contact> "select top 10 * from Person.Contact" Here you have explicitly declared the type parameter for the generic function execCommand. The results from this example are the same as the previous example and are shown in Figure 9-3.
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ADO.NET has been successful at providing a set of bases classes and interfaces that others have been able to implement to provide access to their relational database, so most relational databases can be accessed from F# with little effort. You have already met most of these classes, or at least classes that implement the functionality they are intended to provide, and Table 9-2 summarizes the key ones. Table 9-2. The Key Classes in ADO.NET
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