ColorDialog FontDialog OpenFileDialog Common Dialog Boxes
5.4.1 ColorDialog
The ColorDialog component displays a dialog box that allows the user to choose a color. After the user clicks OK, the chosen color is available in the ColorDialog objects Color property. The Color property can also be set prior to showing the dialog box. This causes the dialog box to initially display the given color. Figur e 5- 14 shows an example of the ColorDialog dialog box. Figure 5-14. The ColorDialog dialog box5.4.2 FontDialog
The FontDialog component displays a dialog box that allows the user to choose a font. After the user clicks OK, the chosen font is available in the FontDialog objects Font property. The Font property can also be set prior to showing the dialog box. This causes the dialog box to initially display the given font. Figur e 5- 15 shows an example of the FontDialog dialog box. Figure 5-15. The FontDialog dialog box 2125.4.3 OpenFileDialog
The OpenFileDialog component displays a dialog box that allows the user to choose a file to open. After the user clicks OK, the name of the file including the path is available in the OpenFileDialog objects FileName property. The FileName property can be set prior to showing the dialog box. This causes the dialog box to initially display the given filename. Figur e 5- 16 shows an example of the OpenFileDialog dialog box. Figure 5-16. The OpenFileDialog dialog box In most cases, your applications should set the InitialDirectory, Filter, and FilterIndex properties prior to calling ShowDialog. This is not necessary for proper functioning of the dialog box, but it will give your application a more professional look and feel. The InitialDirectory property determines which directory is shown when the dialog box first appears. The default is an empty string, which causes the dialog box to display the users My Documents directory. The Filter property holds a String value that controls the choices in the Files of type drop-down list. The purpose of this drop-down list is to let the user limit the files shown in the dialog box based on filename extension. A typical example is shown in Figur e 5- 17 . Figure 5-17. A typical Files of type drop-down list Even though the Files of type list can include many items and each item can represent many filename extensions, a single String property represents the whole thing. Heres how it works: • Each item in the drop-down list is represented by a substring having two parts separated by the vertical bar character | . The first part is the description that appears in the drop-down list e.g., All Files . . The second part is the corresponding filter e.g., . . Taking them together and adding the vertical bar character, the first item in the list in Figur e 5- 17 is represented by the substring: All Files .|. 213 • If a given item has multiple filters, the filters are separated by semicolons ; . The second item in the list in Figur e 5- 17 is therefore represented by: Executable Files .exe; .dll|.exe;.dll • The value to assign to the Filter property is the concatenation of all the substrings thus attained, again separated by the vertical bar character. Therefore, the Filter property value that produced the drop-down list in Figur e 5- 17 is: All Files .|.|Executable Files .exe; .dll|.exe;.dll The default value of the Filter property is an empty string, which results in an empty Files of type drop-down list. The FilterIndex property determines which filter is in force when the dialog box is initially shown. This is a 1-based index that refers to the Filter string. For example, referring again to Figur e 5- 17 , if the FilterIndex property is set to 1 , the All Files item will be selected when the dialog box is shown. If the FilterIndex is set to 2 , the Executable Files item will be shown. The default value is 1 .5.4.4 PageSetupDialog
Parts
» VB.NET - (O'Reilly) Programming Visual Basic NET
» What Is the Microsoft .NET Framework?
» hello, world An Example Visual Basic .NET Program
» Hello, Windows An Example Visual Basic .NET Program
» Hello, Browser An Example Visual Basic .NET Program
» Source Files Identifiers The Visual Basic .NET Language
» Numeric Literals String Literals Character Literals
» Date Literals Boolean Literals Nothing Summary of Literal Formats
» Custom Types Collections Types
» The Namespace Statement The Imports Statement
» Symbolic Constants Scope The Visual Basic .NET Language
» Access Modifiers Assignment The Visual Basic .NET Language
» Unary Operators Arithmetic Operators
» Relational Operators Operators and Expressions
» String-Concatenation Operators Bitwise Operators
» Logical Operators Operator Precedence
» Call Exit Branching Statements
» Goto If RaiseEvent Branching Statements
» Return Select Case Branching Statements
» For Each Iteration Statements
» Object Instantiation and New Constructors
» Handling Events Inheritance Classes
» Passing arrays as parameters
» Variable-length parameter lists Main method
» Implementing interface methods Overriding inherited methods
» Overloading Overloading inherited methods
» The MyBase Keyword Nested Classes Destructors
» Interfaces The Visual Basic .NET Language
» Enumerations The Visual Basic .NET Language
» Exceptions The Visual Basic .NET Language
» Delegates The Visual Basic .NET Language
» Using Events and Delegates Together
» Creating Custom Attributes Attributes
» Standard Modules Conditional Compilation
» Summary The Visual Basic .NET Language
» Common Language Infrastructure CLI and Common Language Runtime CLR
» Global Assembly Cache GAC Comparison of Assemblies, Modules, and Namespaces
» Application Domains Common Language Specification CLS
» Intermediate Language IL and Just-In-Time JIT Compilation Metadata
» Finalize Memory Management and Garbage Collection
» Dispose Memory Management and Garbage Collection
» A Brief Tour of the .NET Framework Namespaces
» Configuration File Format Configuration
» Configuration Section Groups The appSettings Section
» Adding event handlers Creating a Form in Code
» Handling Form Events Windows Forms I: Developing Desktop Applications
» Relationships Between Forms Windows Forms I: Developing Desktop Applications
» Merging Menus MDI Applications
» Detecting MDI Child Window Activation
» Component Attributes Windows Forms I: Developing Desktop Applications
» The Graphics Class 2-D Graphics Programming with GDI+
» The Pen Class 2-D Graphics Programming with GDI+
» The Brush Class 2-D Graphics Programming with GDI+
» System colors The Color Structure
» Alpha Blending 2-D Graphics Programming with GDI+
» Antialiasing 2-D Graphics Programming with GDI+
» The PrintPageEventArgs Class Printing
» The OnBeginPrint and OnEndPrint Methods Choosing a Printer
» The PageSettings Class Printing
» The PrinterSettings Class Printing
» Page Setup Dialog Box Print Preview
» Summary Windows Forms I: Developing Desktop Applications
» The Button Class The CheckBox Class The ComboBox Class
» The DateTimePicker Class The GroupBox Class The ImageList Class
» The Label Class The LinkLabel Class
» The ListBox Class Common Controls and Components
» The ListBox.ObjectCollection Class
» The ListView Class Common Controls and Components
» The MonthCalendar Class Common Controls and Components
» The Panel Class The PictureBox Class
» The RadioButton Class Common Controls and Components
» The TextBox Class The Timer Class
» Other Controls and Components
» Control Events Windows Forms II: Controls, Common Dialog Boxes, and Menus
» The Anchor Property Form and Control Layout
» Controlling dock order The Dock Property
» The Splitter control The Dock Property
» ColorDialog FontDialog OpenFileDialog Common Dialog Boxes
» PageSetupDialog PrintDialog PrintPreviewDialog SaveFileDialog
» Adding Menus in the Visual Studio .NET Windows Forms Designer
» Programmatically Creating Menus Menus
» Building Controls from Other Controls
» Building Controls That Draw Themselves Building Nonrectangular Controls
» Summary Windows Forms II: Controls, Common Dialog Boxes, and Menus
» Setting control properties using attributes Adding event handlers
» AutoEventWireup Handling Page Events
» The Button control Web Controls
» The CheckBox control The DropDownList control
» The Image control The Label control
» The ListBox control Web Controls
» The RadioButton control Web Controls
» The Table control Web Controls
» The TextBox control Web Controls
» Other web controls Web Controls
» HTML Controls Handling Control Events
» Programmatically Instantiating Controls More About Server Controls
» More About Validation-Control Tag Attributes
» Using Validation-Control Properties Providing a Summary View of Validation Failures
» Performing Custom Validation Adding Validation
» Using Directives to Modify Web Page Compilation
» The Server Object ASP.NET Objects: Interacting with the Framework
» The Application Object The Session Object The Cache Object The Request Object
» The Response Object ASP.NET Objects: Interacting with the Framework
» Discovering Browser Capabilities ASP.NET and Web Forms: Developing Browser-Based Applications
» The Session Object Maintaining State
» The Application Object Maintaining State
» Session and Application Startup and Shutdown global.asax Compiles to a Class
» Adding Global Objects Application-Level Code and global.asax
» ASP.NET authorization Authorization
» Windows NTFS authorization Code-access authorization
» IUSR_ComputerName Impersonation Accessing Network Resources
» User Controls Designing Custom Controls
» Creating a custom server control using Visual Studio .NET
» Creating a custom server control in code Using a custom server control in Visual Studio .NET
» Summary ASP.NET and Web Forms: Developing Browser-Based Applications
» The WebService Attribute The WebMethod Attribute
» Testing a Web Service with a Browser
» Consuming a Web Service in Visual Studio .NET
» Consuming a Web Service in Notepad
» Synchronous Versus Asynchronous Calls
» Web-Service Descriptions Web-Service Discovery
» Limitations of Web Services Summary
» A Brief History of Universal Data Access Managed Providers
» Connecting to a SQL Server Database
» Connecting to an OLE DB Data Source
» The DataSet Class Finding Tables
» Finding Column Values Finding Column Definitions Changing, Adding, and Deleting Rows
» Writing Updates Back to the Data Source
» Relations Between DataTables in a DataSet
» The DataSets XML Capabilities
» Binding a DataSet to a Windows Forms DataGrid
» Binding a DataSet to a Web Forms DataGrid
» Typed DataSets ADO.NET: Developing Database Applications
» Reading Data Using a DataReader
Show more