1.c# Forms and controls

1. Partial

Partial is the meaning of "partial". In C #, for easy code management and editing, you can use the Pritial keyword to separate code for the same class into multiple files. Each file is a part of the class code, also known as the distribution class, will be treated as a class by the compiler

1      Public Partial classLogin:form2     {3         //code block4     }5 6 7      Partial classLogin8     {9         //code blockTen     } One  A //two files are merged at compile time

2.form

The form is. The NET Framework defines a most basic form class that has some of the most basic properties and methods of a form, which can be obtained by (colon): Inheriting form classes to get the properties and methods of a form class defined common properties

Property	Description
Name	The name of the form object that is used in the code to identify
BackColor	Background color of the form
BackgroundImage	Background picture of a form
FormBorderStyle	Form's border style, with seven optional values, default to sizable
MaximizeBox	Determines if there is a maximum box in the upper-right corner of the form bar, which defaults to True
ShowInTaskbar	Determines whether the form appears in the window taskbar, which defaults to True
StartPosition	Determine the initial position of the form
Text	The title of the form
Topmost	Indicates whether the form displays on top of all forms that are not set to true on this property, false by default
WindowState	Confirm the initial visual state of the form, including normal (normal), maxximized (maximized), Minimized (minimized) defaults to normal

These properties can be modified in the view design, and Visual Studio generates the appropriate code in the form's designer when modified

For example:

//set Form object background color This. BackColor =System.Drawing.SystemColors.Info;//set a background picture for a form This. BackgroundImage = ((System.Drawing.Image) (resources. GetObject ("$this. BackgroundImage")) ; Set the name of the form object This. Name ="Log";//set Border is not draggable This. FormBorderStyle =System.Windows.Forms.FormBorderStyle.Fixed3D;//sets whether the upper-right corner of the initial form displays a maximized box, by default True This. MaximizeBox =false;//sets whether the form appears in the window taskbar, by default True This. ShowInTaskbar =false;//set the initial position of the form This. StartPosition =System.Windows.Forms.FormStartPosition.CenterScreen;//set the initial size of the form This. WindowState = System.Windows.Forms.FormWindowState.Maximized;

Common methods for form classes

Method	Property
Close ()	Close the form
Show ()	Show form
ShowDialog ()	Modal Display Form
Hide ()	Hide Form

Use of basic controls

1. Commonly used properties for tags (label)

Property	Description
Image	Display a picture on a label
Text	The text on the label

2. Common Properties for text boxes (textbox)

            //Instantiate a text box objectTextBox TB =NewTextBox (); //maximum length that can be entered in a text boxTb. MaxLength = the; //whether multiple lines can be enteredTb. Multiline =false; //set the echo characterTb. PasswordChar ='*'; //set read-onlyTb. ReadOnly =true; //text associated with the text boxTb. Text ="This is the text of the text box";

3. Combo Box (ComboBox)

Property	Description
Items	Items in a combo box
DropDownStyle	Define the style of the combo box
Text	Text associated with a combo box
Slectedindex	Occurs when a control is clicked
Slectedchanged	Gets the current selected item
Event	Description
Click	Occurs when a control is clicked
SelectedChanged	Occurs after the selected property is modified

4. Key properties and events for buttons (button)

Button Property Usage

1.c# Forms and controls