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Note Once again, this option isn t available with complex binding. Some controls provide support with their own events for example, the DataGridView fires a CellFormatting event for each cell where you can perform similar adjustments. The ListBox has no such support.

You can use a similar technique to handle more interesting conversions. For example, you could convert a column value to an appropriate string representation, straighten out issues of case, or ensure the correct locale-specific format for dates and times. Here s one example that compares hard-coded integers from the database against an enumeration: private void ConstantToString(object sender, ConvertEventArgs e) { if (e.DesiredType == typeof(string)) { switch ((ProjectStatus)e.Value) { case ProjectStatus.NotStarted: e.Value = "Project not started."; break; case ProjectStatus.InProgress: e.Value = "Project in progress."; break;

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// expose the inputs text box public TextBox Input { get { return input; } } } } It is then very straightforward to reference the C# .dll from F# and create an instance of the form and use it. The following example demonstrates the code you use to do this: open System.Windows.Forms open Strangelights.Forms // an infinite sequence of Fibonacci numbers let fibs = (1,1) |> Seq.unfold (fun (n0, n1) -> Some(n0, (n1, n0 + n1))) // a function to get the nth fibonacci number let getFib n = Seq.nth n fibs let form = // create a new instance of the form let temp = new FibForm() // add an event handler to the form's click event temp.Calculate.Click.Add (fun _ -> // convert input to an integer let n = int temp.Input.Text // caculate the apropreate fibonacci number let n = getFib n // display result to user temp.Result.Text <- string n) temp Application.Run(form) You can use both techniques to produce similar results, so the question remains: which is best to use for which occasions The problem with a C# form calling F# is that you will inevitably end up writing quite a bit of C# to glue everything together. It can also be difficult to use some F# types, such as union types, from C#. Given these two facts, I generally create a C# forms library and use this from F#. You can learn more about making F# libraries ready for use with other .NET languages in 14.

4. You will then be presented with a list of all of the available backups for the computer you selected, as in the example in Figure 7-46. Select the backup to restore. Chances are that you will want to restore the latest available backup, so just make sure you select that before continuing.

case ProjectStatus.Complete: e.Value = "Project is complete."; break; } } }

Note Be warned this approach can lead you to mingle too many database details into your code. A better

but it s not a great option overall because it means the user can take little advantage of your reactive GUI. A better option is to create a system capable of displaying multiple results, along with their initial parameters. Ensuring that the user knows what a given result means. This example uses a data grid view to display the results: open open open open open Strangelights.Extensions System System.ComponentModel System.Windows.Forms System.Numerics

approach is to handle the problem at the database level, if you can. For example, if you use a list of numeric constants, create a table in the database that maps the numbers to text descriptions. Then, make this information available to your form either through a separate method in your data access class or by using a JOIN query when retrieving the data.

5. If you want to see additional details about any of the available backups, just click the backup, and then click the Details button. This will bring up additional information about the backup, including when the backup took place and which files were excluded from the backup, as shown in Figure 7-47. Click OK after you have reviewed the backup details to return to the backup selection screen.

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