Winform form (2) -- controls and winform controls

Winform form (2) -- controls and winform controls

I,Form event

Each form has an event.Code that is executed after the form is loaded

Location: 1) Right-click Properties → events → load double-click to enter

2) double-click any position in the form to enter

Delete event: Delete the events on the event page, and then delete the events in the background code.

Namespace WindowsFormsApplication2 {public partial class Form1: Form {public Form1 () // constructor {InitializeComponent ();} private void Form1_Load (object sender, EventArgs e) // sender (event source): Who triggers the event, who is Form1, and e (event data) {// write event}Event

 

※Find the control in the toolbox and double-click it to add it. You can also drag it in.

※Each tool, control, and form has a name, which is equivalent to an id used to identify the name of the object. The name value cannot be repeated.

Ii. Controls

1,Label -- text display tool

Text: the Text to be displayed-attributes

Label Value assignment:

Private void Form1_Load (object sender, EventArgs e) {label1.Text = "Ah hahaha"; MessageBox. Show (label1.Text );}Label

 

2. TextBox -- text box

TextBox Value assignment:

Private void Form1_Load (object sender, EventArgs e) {textBox1.Text = "Enter the user name"; MessageBox. Show (textBox1.Text );}TexBox

 

3. RichTextBox -- text field

You can adjust the size at will.

Some attributes:

Dock: defines the border of the control to be bound to the container.

Multiline: controls whether the text of the editing control can span multiple lines.

ReadOnly: controls whether to change the text in the editing control. The default value is False. If it is set to True, the value is read-only.

Enabled: indicates whether the control is Enabled.

Visible: Determine whether the control is Visible or hidden.

※The usage is the same as that of TextBox.

 

4. Button -- Button

Text: Modify the text displayed by the button

Name: id

FlatStyle: determines the display of the control when you move the mouse over the control and click

※Click event: Double-click a button to display certain time features.

 

5. radioButton -- Single-choice button

Text: text

Checked: whether to select

Multiple Single-choice buttons are mutually exclusive. winform does not have the group attribute, So it depends on their parent-level containers (only the upper-level containers). If the same parent-level container is the same group

If you want to group, put the buttons in the same group under the same container and use Panel

Select a value:

Each tool is a class. For example, radiobutton is a radiobutton class.

Each form is inherited from the form class. All tools also inherit from one parent class, that is, Control.

Private void button2_Click (object sender, EventArgs e) {// from all tools (objects) in form1 foreach (Control ctr in panel1.Controls) // all the tools under the container are a set {// determine whether the ctr of the object belongs to the subclass radiobutton if (ctr is RadioButton) {// if yes, the device type is RadioButton rd = ctr as RadioButton; if (rd. checked) {MessageBox. show (rd. text );}}}}Radiobutton -- Obtain the selected value

Set a selected item:

Private void button3_Click (object sender, EventArgs e) {// traverses the foreach (Control ctr in panel1.Controls) tool in form1 {// determines whether it is a subclass radiobutton if (ctr is RadioButton) {// if the conversion is RadioButton rd = ctr as RadioButton; if (rd. text = "female") {rd. checked = true ;}}}}Radiobutton -- set selected

※Use the code to add a tool to the container:

Private void Form1_Load (object sender, EventArgs e) {// create the tool's object RadioButton radiobutton4 = new RadioButton (); // assign the value radiobutton4.Text = "ha "; // There is a parent class in the brackets, and the rdsx principle is panel1.Controls. add (radiobutton4 );}Code adding Tool

 

6. checkbox -- check box Group

Checked attribute: whether to select

Tag attribute: You can store custom numbers.

Select a value:

Private void button4_Click (object sender, EventArgs e) {foreach (Control ctr in panel2.Controls) {if (ctr is CheckBox) {CheckBox ck = ctr as CheckBox; if (ck. checked) {MessageBox. show (ck. text );}}}}Checkbox -- get the selected value

Read access customization:MessageBox. Show (ck. Tag. ToString ());

Set a selected item:

Private void button5_Click (object sender, EventArgs e) {foreach (Control ctr in panel2.Controls) {if (ctr is CheckBox) {CheckBox ck = ctr as CheckBox; if (ck. text = "Han") {ck. checked = true ;}}}}Checkbox -- set the selected

Select All:

Private void checkBox3_CheckedChanged (object sender, EventArgs e) {foreach (Control ctr in panel2.Controls) {if (ctr is CheckBox) {CheckBox ck = ctr as CheckBox; ck. checked = checkBox3.Checked ;}}}Select All or all

 

7. listbox -- list box

Items: the value in the list box is a set that is generally added by reading data from the database.

SelectionMode: indicates whether the list box will be selected individually.

Add data from the database:

First, establish a database connection (three classes, the class creation program is omitted), and then use the following program to add;

Private void formationload (object sender, EventArgs e) {NationDA da = new NationDA (); // specify the data source listBox1.DataSource = da for listbox. select (); // specify the displayed value listBox1.DisplayMember = "Name"; // specify the background value listBox1.ValueMember = "Code ";}Add data from database

Take the value of multiple selected values:

Private void button6_Click (object sender, EventArgs e) {foreach (Nation data in listBox1.SelectedItems) // SelectedItems obtains the set of currently selected items {MessageBox. Show (data. Code );}}Obtain the value of multiple selected items

Take the selected value:

MessageBox. Show (listNation. SelectedValue. ToString ())

Select an item:(The object is obtained)

Nation data = listbox1.SelectedItem as Nation; MessageBox. Show (data. Code );

Set a selected item:

Private void button7_Click (object sender, EventArgs e) {// Method 1: // listBox1.SelectedIndex = 1; // set the index of the currently selected item starting from 0 // Method 2: listBox1.SelectedValue = "n005"; // set the value of the specified member attribute}Set two methods for selecting an item

 

8. combobox -- drop-down list

All usage is the same as listbox:

Private void formationload (object sender, EventArgs e) {NationDA da = new NationDA (); // select Nation data = new Nation (); data. code = "qxz"; data. name = "select"; List <Nation> list = da. select (); list. add (data); comboBox1.DataSource = list; comboBox1.DisplayMember = "Name"; comboBox1.ValueMember = "Code ";}Add database information and add another item.

 

9. DataTimePicker-date Selection Control
Select Settings:

Private void button8_Click (object sender, EventArgs e) {// define a time string sj = "2016-1-1 1-1"; // Method 1: // dateTimePicker1.Value = Convert. toDateTime (sj); // Method 2: dateTimePicker1.Text = sj ;}Set Time 2 Method

Select a value:

Private void button7_Click (object sender, EventArgs e) {MessageBox. Show (dateTimePicker1.Value. ToString ("yyyy MM dd HH: mm: ss: ms "));}Select time

 

10. PictureBox

Appearance. You can select the Image path for the Image.

Behavior. SizeMode allows you to set the image size layout mode.

 

11. Imagelist-image set

ImageList1.Images [n];

 

12. notifyicon-Tray Icon Tool
Text: The Text displayed with the mouse
Icon: tray Icon
Visible: Visible or hidden
ContextMenuStrip: shortcut menu associated with the icon

 

13. MenuStrip-menu Tool
Set the hotkey: enter (& F) during editing)
Set Shortcut Keys: Select menu items -- Right-click Properties -- ShortCutKeys -- set shortcut keys
Set the separation line: Enter the minus sign (-) when entering (-)

 

14. ContextMenuStrip-shortcut menu

 

15. ToolTip -- move the mouse into the prompt box

ToolTipTitle: the title of the prompt

Error: Error icon

Info: information icon

None: not a standard icon

Warning: Warning Icon

In miscellaneous of other controls, select

 

16. ProgressBar -- progress bar
Value: to set the progress of the progress bar.

MarqueeAnimationSpeed: subtitle animation speed in milliseconds

Maximum: Maximum used range

 

17. Timer-clock Tool

Enabled: unavailable
Interval: Interval
Tick event: Events EXECUTED AT INTERVALS

※Tick events and progress bars are used in combination.

Private void timerjavastick (object sender, EventArgs e) {if (progressBar1.Value <100) {progressBar1.Value = progressBar1.Value + 10;} label1.Text = DateTime. now. toString ("HH: mm: ss ");}Union

 

※In the preceding settings and the selected values, the Click Event of the Button is used!