make barcode with vb.net 18: Creating Windows Applications in C#

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18: Creating Windows Applications
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Now you can use the IComparer interface. Return to GetFileList( ), and add the following code to instantiate the IComparer reference and pass it to the Sort( ) method of fileList:
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IComparer<FileInfo> comparer = ( IComparer<FileInfo> ) new FileComparer( ); fileList.Sort( comparer );
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With that done, you can return fileList to the calling method by adding this line:
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return fileList;
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The calling method was btnCopy_Click. Remember, you went off to GetFileList( ) in the first line of the event handler:
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protected void btnCopy_Click (object sender, System.EventArgs e) { List<FileInfo> fileList = GetFileList( );
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At this point, you ve returned with a sorted list of File objects, each representing a file selected in the source TreeView. You can now iterate through the list, copying the files and updating the UI. Add the following foreach loop to btnCopy_Click to accomplish that:
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foreach ( FileInfo file in fileList ) { try { lblStatus.Text = "Copying " + txtTargetDir.Text + "\\" + file.Name + "..."; Application.DoEvents( ); // copy the file to its destination location file.CopyTo( txtTargetDir.Text + "\\" + file.Name, chkOverwrite.Checked ); } catch ( Exception ex ) { MessageBox.Show( ex.Message ); } } lblStatus.Text = "Done.";
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The first thing this loop does is write the progress to the lblStatus label. You output a message, Copying , followed by whatever is currently showing in txtTargetDir, which must be the target directory the user selected. Then you add a backslash and the filename being copied. Next, the loop calls Application.DoEvents( ) to give the UI an opportunity to redraw; if you didn t, your status message would never show up. Then the loop calls CopyTo( ) on the file, passing in the target directory (again, obtained from the txtTargetDir), and a Boolean flag indicating whether the file should be overwritten if it already exists. CopyTo( ) is a method of the FileInfo class that takes a FileInfo object and a Boolean.
Creating a Real-World Application |
The copy is wrapped in a try block because you can anticipate any number of things going wrong when copying files the file might be in use, the target directory might become unavailable, the target disk could be full, or many other things. In a commercialgrade application, you d create custom exceptions to handle all of these possibilities. For now, though, if any exception is thrown, you ll pop up a dialog box showing the error. That s it; you ve implemented file copying! Not so hard, was it The CopyTo( ) method does most of the work. You re not done yet, though; there are still two more buttons to handle.
Handling the Delete button event
The code to handle the Delete event is simple, but it will give us an opportunity to show you how message boxes work. Double-click the Delete button to create the handler. The very first thing you do is ask the user whether she is sure she wants to delete the files. Copy this code to the btnDelete_Click handler:
private void btnDelete_Click( object sender, System.EventArgs e ) { // ask them if they are sure System.Windows.Forms.DialogResult result = MessageBox.Show( "Are you quite sure ", // msg "Delete Files", // caption MessageBoxButtons.OKCancel, // buttons MessageBoxIcon.Exclamation, // icons MessageBoxDefaultButton.Button2 ); // default button
You can use the MessageBox class s static Show( ) method, passing in five parameters: first, the message you want to display, as a string; second, the title for the message box as a string, which will be Delete Files in this case. The rest of the parameters are flags, as follows: MessageBox.OKCancel indicates that you want the message box to have two buttons: OK and Cancel. You don t need to write any code for these buttons; they work automatically. The MessageBox.IconExclamation flag specifies the icon that you want to appear in the message box: an exclamation mark in this case. Finally, the MessageBox.DefaultButton.Button2 flag sets which of the buttons you asked for should be the default choice. In this case, you re choosing the second button (Cancel). Notice that you re not just displaying the dialog box here; you re capturing the user s choice in a variable called result. When the user chooses OK or Cancel, the result is passed back as a System.Windows.Forms.DialogResult enumerated value. You can test this value to see whether the user selected OK; add this line to the event handler:
if ( result == System.Windows.Forms.DialogResult.OK ) {
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