C application interface development foundation - form control (3) - file control

File control

One 、 Label control

1、Label Control settings

There are two ways ： The first is directly in Label Control in the property panel Text attribute ; The second is to set up through code Text attribute .

label1.Text=" user name ：";

2、Label Control

（1）Size attribute ： The size of the control （ In pixels ）.

（2）Location attribute ： The position of the label in the form .

（3）Visible attribute ： Visibility of labels , by True Visible when , by False It's not visible .

（4）BackColor attribute ： Used to get or set the background color of the control . When the attribute value Set to Color

（5）ClientSize attribute ： Get or set the size of the workspace .

（6）Location attribute ： The position of the label in the form .

Programming , Realization “ You run after me ”.

The code is as follows ： 

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void label1_Click(object sender, EventArgs e)
        {
            MessageBox.Show("(T.T) You caught me ！！！");
        }

        private void label1_MouseEnter(object sender, EventArgs e)
        {
            int x = this.ClientSize.Width - label1.Width;
            int y = this.ClientSize.Height - label1.Height;
            Random r = new Random();
            label1.Location = new Point(r.Next(0, x + 1), r.Next(0, y + 1));
        }
    }
}

The operation results are as follows ：

Two 、 Button control

Button controls are the most commonly used controls , This control is mainly used to write the Click Events and MouseEnter Event code .

1、 Respond to the click event of the button

After the double-click , Put it in the right place .

stay Text Attribute input click the button

button Adjust the size , Placement position , Text changes . 

  trigger Click event

  Double click later

Enter the code ：

  The code is as follows ：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Click(object sender, EventArgs e)
        {
            MessageBox.Show(" You triggered Click event ");
        }
    }
}

Running results ：

  After clicking ：

No response .

The code is as follows ： 

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Click(object sender, EventArgs e)
        {
            
        }

        private void button1_Click(object sender, EventArgs e)
        {
            MessageBox.Show(" You triggered Click event ");
        }
    }
}

2、 Button settings

 

 

The code is as follows ：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            this.AcceptButton = button1;
            this.CancelButton = button2;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            MessageBox.Show(" ha-ha ！ I'm kidding you ", " You believe it ");
        }

        private void button2_Click(object sender, EventArgs e)
        {
            Close();
        }
    }
}

 

3、 ... and 、 Text box control

C# Text controls are often used to receive user input or display in forms Text , With this control, users can enter text 、 Password and other information , It can also control Length of user input 、 Type, etc .

1、TextBox Control

（1）Backclock attribute ： Set background color .

（2）BorderStyle attribute ： Set up TextBox The type of border is enumeration value , There are three values ：None（ No borders ）、FixedSingle（ One side border ）、Fixed3D（ Three dimensional frame ）.

（3）Font attribute ： Set up TextBox The font of , Include font name 、 size 、 Is it bold 、 Is it italicized 、 Whether there is a lower line, etc .

（4）Forecolor attribute ： The foreground , That is, the color of the font .

（5）MaxLength attribute ： Control the number of characters that can be entered in the text box .

（6）Multiline attribute ： Set up TextBox Control allows multiple lines of input .

（7）PasswordChar attribute ： If you want to let TextBox Enter the password without displaying the original characters , You can specify a character to replace the original character .

（8）ReadOnly attribute ： Control can be changed TextBox The text in the , The default is False, That is, you can modify , If True, Then the user cannot modify the text inside .

（9）Text attribute ： For reading or setting TextBox The text in the .

（10）TextAlign attribute ： Alignment of text , There are three values ：Left、Center or Right, The default is Left.

（11）Visible attribute ： Used to set whether the control is hidden or displayed , If set to False, The control is invisible when the program runs .

（12）WordWrap attribute ： When Multiline Property is set to True when , This attribute works , Used to indicate whether the control wraps lines .

2、TextBox Control

（1）AppendText()： The method TextBox Control to append text .

（2）Clear()： Clear the contents of the text box .

（3）Copy()： Copy the contents of the text box to the clipboard .

（4）Focus()： Make the text box focus .

（5）Paste()： Replace the specified content in the text box with the content in the clipboard .

（6）Resettext()： Reset the contents of the text box to the default value .

（7）Select()： Select the text specified in the text box .

（8）Selectall()： Select all the text in the text box .

（9）Undo()： Undo the last modification of the text box .

3、TextBox Use of control

11 individual Label Control 、5 individual TextBox Control 、2 individual Button Control

Four 、 Formatted text control

1、 Show scroll bar

There are two kinds of scrollbars ： level （Horizontal） Scroll bar and vertical （Vertical） Scroll bar , adopt RichTextBox Of ScrollBars Property to set how the scroll bar is displayed .

ScrollBars Attribute value and description of

attribute	explain
Both	Only if the text exceeds RichTextBox The width or length of , The horizontal scroll bar or vertical scroll bar is displayed , Or both scrollbars
None	Do not display any type of scroll bar
Horizontal	Only if the text exceeds RichTextBox The width of , The horizontal scroll bar is displayed
Vertical	Only if the text exceeds RichTextBox Altitude time , The vertical scroll bar is displayed
ForceHorizontal	When WordWrap Property is set to false when , Show horizontal scroll bar . In the text no more than RichTextBox The width of , The scroll bar is light gray
ForcedVertical	Always show vertical scroll bar . In the text no more than RichTextBox When the length of the , The scroll bar is light gray
ForcedBoth	Always show vertical scroll bar . In the text no more than RichTextBox Property is set to false when , Show horizontal scroll bar . In the text no more than RichTextBox The width or length of , Both scrollbars are gray .

2、 Set font properties

There are two ways ：

（1） Select Font Property settings RichTextBox Control font size and typeface ;

（2） adopt RichTextBox Of SelectionFont Properties and SelectionColor Property to set the font size and color .

3、 take RichTextBox Control is displayed as a hyperlink style

4、 Format paragraph