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return false; }

This constraint ensures that only types that implement IComparable are valid type arguments for IsIn( ) The following program demonstrates IsIn( ) It also shows how IComparable can be easily implemented by a class:

Update the Tag property for the appropriate object. Note: When the object is a list item, this updates the corresponding node as well.

// Demonstrate IComparable using System; class MyClass : IComparable { public int Val; public MyClass(int x) { Val = x; } // Implement IComparable public int CompareTo(object obj) { return Val - ((MyClass) obj)Val; } } class CompareDemo { // Require IComparable interface public static bool IsIn<T>(T what, T[] obs) where T : IComparable { foreach(T v in obs) if(vCompareTo(what) == 0) // now OK, uses CompareTo() return true; return false; } // Demonstrate comparisons static void Main() { // Use IsIn() with int int[] nums = { 1, 2, 3, 4, 5 }; if(IsIn(2, nums)) ConsoleWriteLine("2 is found"); if(IsIn(99, nums)) ConsoleWriteLine("This won t display");

// Update the appropriate Tag property if (item != null) { item.Tag = newFileName; if (node != null) node.Text = newName; } else if (node != null) node.Tag = newFileName; return true; }

Part I:

private bool UpdatePhotoCaption (string caption, object obj) { ListViewItem item = obj as ListViewItem; TreeNode node = obj as TreeNode; // Determine the album index int index = -1; if ((item != null) && (item.Tag is int)) { index = (int)item.Tag; node = FindNode(_album[index].FileName, false); } else if (node != null) { index = node.Index; }

string[] strs = { "one", "two", "Three"}; if(IsIn("two", strs)) ConsoleWriteLine("two is found"); if(IsIn("five", strs)) ConsoleWriteLine("This won t display");

// Use IsIn with MyClass MyClass[] mcs = { new MyClass(1), new MyClass(2), new MyClass(3), new MyClass(4) }; if(IsIn(new MyClass(3), mcs)) ConsoleWriteLine("MyClass(3) is found"); if(IsIn(new MyClass(99), mcs)) ConsoleWriteLine("This won t display"); } }

a. Change the second parameter to an object rather than a ListViewItem. b. Convert the given object to both a list item and a tree node. c. Determine the album index for the appropriate object. d. If the object is a list view item, also find the node corresponding to this item. 10 Return false if the caption cannot be updated.

The output is shown here:

if ((caption.Length == 0) || (index < 0)) { MessageBox.Show("Invalid caption value."); return false; }

Although the preceding program is correct, there is still one potential trouble spot Notice how CompareTo( ) is implemented by MyClass:

public int CompareTo(object obj) { return Val - ((MyClass) obj)Val; }

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SUPPORT EDITING OF TREE NODE LABELS (continued) Action 11 Update the photograph s caption, and save the changes to the album. Note: When the object is a list item, this updates the corresponding node as well.

Because the parameter to CompareTo( ) must be of type object, obj must be explicitly cast to MyClass in order for Val to be accessed However, it s precisely this type of thing that generics were designed to eliminate! To solve this problem, C# provides a generic version of IComparable, which is declared like this: public interface IComparable<T> In this version, the type of data being compared is passed as a type argument to T This causes the declaration of CompareTo( ) to be changed, as shown next: int CompareTo(T obj) Now, the parameter to CompareTo( ) can be specified as the proper type and no cast from object is needed IComparable<T> is also implemented by all built-in types Here is an improved version of MyClass that implements IComparable<T>:

// Update caption _album[index].Caption = caption; if (item != null && node != null) { // Update node text as well node.Text = caption; } // Save the changes to the album . . .

// This version of MyClass implements IComparable<T> class MyClass : IComparable<MyClass> { public int Val;

18: