Bài giảng Lập trình trên Windows với Microsoft.NET - Phần 8

Lập trình trên Windows với Microsoft® .NET	 Giảng viên : Hồ Hoàn Kiếm 
SDI Application 
SDI (1) 
New 
Document 
An SDI application can have only one active window at a time 
Active Window 
Closed 
MDI Application 
MDI (2) 
Inner Window (or) 
Child Window 
Outer Window (or) 
Parent Window 
MDI Application 
Designing an MDI application 
IsMdiContainer 
= true 
MDI Application 
Activating and Deactivating Windows 
Deactivate child window 
Active child window 
MDI Application 
Types of Menu 
MainMenu 
ContextMenu 
As in MDI form during design 
As with the control at runtime 
Main Menu 
Displays a menu at runtime 
MainMenu can be created in two ways: 
Using the MainMenu control, and menu designer at design time 
Creating an instance of the MainMenu class at runtime 
1 
2 
MainMenu myMainMenu = new MainMenu(); 
this.Menu = myMainMenu; 
Main Menu 
PROPERTIES 
EVENTS 
Select 
Popup 
Click 
Text 
ShortCut 
PerformSelect 
Parent 
PerformClick 
METHODS 
Index 
ShowShortCut 
MenuItems 
Context Menu 
Context menus give users access to frequently used commands by clicking the right mouse button 
Context menus are created with the help of the ContextMenu control 
ToolBar 
It is situated immediately below the menu bar 
The buttons in a ToolBar are analogous to the items in a menu 
 Different button appearance options: 
 DropDownButton 
 Separator 
 ToggleButton 
ToolBar control icon as in ToolBox 
Form Level and Control Level Validations 
Validate data in all the fields in the form 
Enable and Disable controls based on user input 
Main Events 
KeyPress 
KeyDown 
KeyUp 
Errors 
Description 
Syntax Error 
Occurs when we enter an incorrect line of code such as a mistake in typing a keyword, missing punctuation, or an incorrectly specified variable. 
Run-time Error 
Occurs when a command attempts to perform an invalid action. 
Logic Error 
Occurs when an application executes without syntax errors or run-time errors, but the results are not which were intended. 
Types of Errors 
ErrorProvider Control 
Properties 
Methods 
BlinkRate 
GetError 
BlinkStyle 
SetError 
ContainerControl 
Icon 
ErrorProvider control can be used to display an error icon when the user enters invalid data. 
Exception Handling 
throw 
try 
catch 
finally 
Exceptions can be handled with the help of :