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In the query, pay special attention to the select clause :

select new EmailAddress(entryName, entryEmail);

REPLACING THE TOOLBAR Our toolbar was designed to interact with the menu bar for our MainForm class, and not the merged menu in our MDI application. As a result, it is no longer appropriate for our purposes. As a simple solution to this problem, we will simply hide the toolbar when the MainForm object is an MDI child form. While we are at it, we can create a very simple toolbar in the ParentForm class to demonstrate such a control in an MDI application. Figure 16.6 shows our application after these changes have been made.

It creates a new EmailAddress object that contains the name and e-mail address obtained from a ContactInfo object in the contacts array The key point is that new EmailAddress objects are created by the query in its select clause, during the query s execution

Figure 16.6 The toolbar here must locate the appropriate event handler for the active child form whenever a button is clicked.

Part I:

A query can contain more than one from clause Thus, a query can contain nested from clauses One common use of a nested from clause is found when a query needs to obtain data from two different sources Here is a simple example It uses two from clauses to iterate over two different character arrays It produces a sequence that contains all possible combinations of the two sets of characters

Set the version number of the MyPhotos application to 16.4. HIDE THE TOOLBAR IN OUR CHILD FORM Action 1 2 Locate the OnLoad method in the MainForm.cs code window. Update this method to hide the toolbar when this form is an MDI child form. Result

// Use two from clauses to create a list of all // possible combinations of the letters A, B, and C // with the letters X, Y, and Z using System; using SystemLinq;

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protected override void OnLoad(EventArgs e) { if (IsMdiChild) { menuExit.Text = "&Close"; toolBarMain.Visible = false; } base.OnLoad(e); }

holds the result of the query { First; Second;

public ChrPair(char c, char c2) { First = c; Second = c2; } } class MultipleFroms { static void Main() { char[] chrs = { 'A', 'B', 'C' }; char[] chrs2 = { 'X', 'Y', 'Z' }; // Notice that the first from iterates over chrs and // the second from iterates over chrs2 var pairs = from ch1 in chrs from ch2 in chrs2 select new ChrPair(ch1, ch2); ConsoleWriteLine("All combinations of ABC with XYZ: "); foreach(var p in pairs) ConsoleWriteLine("{0} {1}", pFirst, pSecond); } }

Not very exciting, but it does the job. A similar argument could be made for the status bar. In this case, since the status bar is still accurate and provides some useful information related to the displayed album, we will simply leave this control alone. As for a Toolbar control in the parent form, we will create a simple control with five buttons to demonstrate how this is done. Our buttons will correspond to the New, Open, Save, Previous, and Next menu items in our merged menu. The one 544

The output is shown here:

change from what we saw in chapter 13 when creating our original toolbar is that the Save, Previous, and Next buttons must operate on the active child form, rather than the parent form. The ActiveMdiChild property in the Form class is used to identify the active child for a form. We will use this to implement our toolbar buttons in the parent form. We will also use the C# internal keyword here to expose some of our MenuItem objects in the MainForm class to other classes in our assembly, and in particular to our ParentForm class. This keyword is an access modifier like public or protected, and permits any other class in the same assembly to have access to the class member. Let s see how these constructs are used by creating the Toolbar control for our parent form. Since toolbars were discussed in chapter 13, we will simply highlight the required changes without too much detailed discussion.

19: