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So far you ve looked only at a script style of programming, where you use an existing form and controls to put forms together quickly. This style of programming is great for the rapid development of singleform applications, but it has some limitations in cases where you want to create applications composed of multiple forms quickly, or you want to create libraries of forms for use with other .NET languages. In these cases, you must take a more component-oriented approach. Typically, you want to use some forms repeatedly when you create a large WinForms application; furthermore, you typically want these forms to be able to communicate with each other by adjusting each other s properties and calling each other s methods. You usually do this by defining a new form class that derives from System.Windows.Forms. Listing 8-4 shows a simple example of this, using the class syntax introduced in 5. Listing 8-4. A Demonstration of Creating a New Type of Form open System open System.Windows.Forms // a class that derives from "Form" and add some user controls type MyForm() as x = inherit Form(Width=174, Height=64) // create some controls to add the form let label = new Label(Top=8, Left=8, Width=40, Text="Input:") let textbox = new TextBox(Top=8, Left=48, Width=40) let button = new Button(Top=8, Left=96, Width=60, Text="Push Me!") // add a event to the button do button.Click.Add(fun _ -> let form = new MyForm(Text=textbox.Text) form.Show()) // do do do add the controls to the form x.Controls.Add(label) x.Controls.Add(textbox) x.Controls.Add(button)

This example leaves out one detail how do you save the survey data once the form is complete Because the controls are created dynamically, you can t make use of any form-level references. Instead, you need to iterate through the Controls collection, looking for input controls (in this case, the TextBox, RadioButton, and CheckBoxList). Each time you find one of these controls, you can record the Name property (which reflects the id set in the survey file) and the usersupplied data.

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} The slight change is the addition of the keyword override to indicate that the ConvertTo() and ConvertFrom() methods in HotelCurrencyTrader and ActiveCurrencyTrader override the functionality in CurrencyTrader While you have seen all of the technical aspects, the bigger question is why you would do this in the first place Let s go back to the implementation of ActiveCurrencyTrader, which has no abstract method implementations To use the class and the method ConvertTo(), you would write the following code..

One interesting application of the FlowLayoutPanel is to lay out multiple modules in a portalstyle application. For example, you might have an application that provides different features or data views to different users, depending on their roles or their preferences. You can implement each feature using a separate user control, and then show the appropriate group of user controls in a FlowLayoutPanel. (Depending on the way you want to arrange these controls, you might alternatively choose to use a TableLayoutPanel with defined columns.) Figure 21-22 shows an example that puts several CollapsiblePanel controls (from 12) into a FlowLayoutPanel.

Figure 21-22. A portal-style application with layout panels What s interesting about this example is the way it s modular: You can hide individual panels, and the interface will reflow seamlessly. To help demonstrate this, the form presents a list of all the currently displayed modules. When the form first loads, it scans through the FlowLayoutPanel looking for panels and adds them to the list: Private Sub ModularPortal_Load(ByVal sender As Object, _ ByVal e As EventArgs) Handles MyBase.Load For Each ctrl As Control In flowLayoutPanel1.Controls If TypeOf ctrl Is Panel Then lstModules.Items.Add(ctrl.Text, True) End If Next End Sub A single click in the list is all you need to hide or show a panel: Private Sub lstModules_ItemCheck(ByVal sender As Object, _ ByVal e As ItemCheckEventArgs) Handles lstModules.ItemCheck For Each ctrl As Control In flowLayoutPanel1.Controls If ctrl.Text = lstModules.Text Then If e.NewValue = CheckState.Checked Then ctrl.Visible = True

// expose the text box as a property member x.Textbox = textbox // create an new instance of our form let form = let temp = new MyForm(Text="My Form") temp.Textbox.Text <- "Next!" temp [<STAThread>] do Application.Run(form)

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