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19: User-Interface Components
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By making proper use of dialog boxes, you can ensure that your application will retain some consistency between programs You also save yourself a lot of valuable time by not reinventing the wheel (or, in this case, the dialog box)
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Working with Controls at Run Time
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Although it is very easy to add controls to your application at design time by making use of the Windows Forms Designer, it is imperative to understand how to add controls at run time Very often, you will need to create a control on the fly, in response to the circumstances during the running of your application We will look at the ControlsCollection and talk about the Controls property, which let you do this EXAM TIP Microsoft will not likely ask you to add controls at design time using a visual editor you will need to know the properties and events that we have just covered in this chapter However, it is a good idea to have a firm grasp on adding controls at run time, since there will be direct questions on adding controls in this fashion
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The Collection Object
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All the controls on a Windows Form (or in a container control like the Panel) are part of a collection object The object itself is of type ControlCollection The ControlCollection object represents a collection of control objects buttons, list boxes, and so on You can access the controls by using the Controls property The following list demonstrates some of the capabilities of the collection object: You can add or remove controls from the collection You can iterate through the collection by using the GetEnumerator() method By calling the Contains() method, you can check whether a particular control is part of the collection You can use the Count property to return the number of controls in the collection To test whether a particular control is part of the collection, try the following example code:
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if (form1ControlsContains (btnClickMe)) { MessageBoxShow("We found the button"); }
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You can also clear the full collection by using this line:
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form1ControlsClear();
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Any control that acts as a container has the Controls collection If we wanted to clear the controls from a TabPage, we would code this line:
tabPage1ControlsClear();
Adding a Control at Run Time
We are able to create a customized version of our application by allowing users to add and remove controls at run time By adding the following code section to our college application, teachers can access a few more controls than students can In Figure 19-7, we have added a button that, when clicked, displays a text box on the tab page asking for a password The text box is not part of the form until someone clicks on the If You Are a
Figure 19-7
Adding a control at run time
19: User-Interface Components
Teacher, Click Here button Once the password is validated, we can then add more functionality via extra controls for a teacher The new code looks like this:
private void btnTeacher_Click (object sender, SystemEventArgs e) { TextBox t = new TextBox(); tText = "Enter your password "; tWidth = 200; tLeft = 250; tTop = 320; tabCoursesControlsAdd (t); }
This code section will add the new control to the Controls collection on the tab page the next step is, of course, to add the extra functionality This section has introduced the typical controls with which any Windows programmer will work Experiment with each one of them Microsoft expects you to have a full understanding of their functionality
Working with Menus
Now that we ve discussed all the common controls, it s time to move into another big arena for visual presentation of your application Nearly every Windows Forms program has a menu attached to it menus give the user a list of options that are available within the application There are two types of menus in the NET world the regular menu that you see attached to the top of any application window, and the menu that appears when you right-click on something The first type is a MainMenu, while the right-click menu is a ContextMenu We will start this section of the chapter by looking at the MainMenu object and then conclude the section discussing the ContextMenu
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