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// Create a node for each album file foreach (string s in Directory.GetFiles( PhotoAlbum.DefaultDir, "*.abm")) { String baseName = Path.GetFileNameWithoutExtension(s); TreeNode albumNode = new TreeNode(baseName) defaultRoot.Nodes.Add(albumNode); // Open the album PhotoAlbum album = OpenAlbum(s); if (album == null) { // Bad album, so adjust the image index settings albumNode.ImageIndex = ErrorIndex; albumNode.SelectedImageIndex = ErrorIndex; continue; } // Create a node for each photo in this album foreach (Photograph p in album) { string text = album.GetDisplayText(p); TreeNode photoNode = new TreeNode(text, PhotoIndex, SelectedPhotoIndex); albumNode.Nodes.Add(photoNode); } album.Dispose(); } treeViewMain.EndUpdate(); }

class Test<T> where T : new() {

18:

Instead, we will take an as-needed approach to our tree nodes. Initially we will create only the album nodes, and then add the photographs for an album only when the user expands that album s node. To begin this process, we need to modify our OnLoad method to create the initial tree structure.

Because of the new( ) constraint, any type argument must supply a parameterless constructor Next, examine the Test constructor, shown here:

MODIFY THE ONLOAD METHOD Action 1 In the MainForm.cs code window, update the OnLoad method to initialize the tree view control before the form is displayed. Result

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Jun 9, 2015 · A GS1 Parser for C#. Contribute to ... http://stackoverflow.com/questions/9721718/ean128-or-gs1-128-decode-c-sharp/28854802#28854802.

public Test() { // This works because of the new() constraint obj = new T(); // create a T object }

A new object of type T is created and a reference to it is assigned to obj This statement is valid only because the new( ) constraint ensures that a constructor will be available To prove this, try removing the new( ) constraint and then attempt to recompile the program As you will see, an error will be reported In Main( ), an object of type Test is instantiated, as shown here:

12:

protected override void OnLoad(EventArgs e) { . . . // Initialize the tree and list controls InitTreeData(); LoadAlbumData(PhotoAlbum.DefaultDir); }

Test<MyClass> x = new Test<MyClass>();

The InitTreeData method will clear the nodes we created with the TreeNode Editor and add the top-level default node and set of albums from the default album directory. This table continues the steps from the previous table.

Notice that the type argument is MyClass, and that MyClass defines a parameterless constructor Thus, it is valid for use as a type argument for Test It must be emphasized that it was not necessary for MyClass to explicitly declare a parameterless constructor Its default constructor would also satisfy the constraint However, if a class needs other constructors in addition to a parameterless one, then it would be necessary to also explicitly declare a parameterless version, too There are three important points about using new( ) First, it can be used with other constraints, but it must be the last constraint in the list Second, new( ) allows you to construct an object using only the parameterless constructor, even when other constructors are available In other words, it is not permissible to pass arguments to the constructor of a type parameter Third, you cannot use new( ) in conjunction with a value type constraint, described next

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do it yourself by creating a bitmap image with bars and spaces computed using the rules in the standard. What way do you want to go ?

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