C form application of C (27)

Start today C# forms .

（ One ）： First create a form application

file -> newly build -> project

（ Two ）： Buttons and labels in forms （button/label）

Click toolbox , Fix it on the screen .

When setting button and label properties , Remember to modify it NAME attribute And Text attribute

/**
         *  Method of event 
         */
        private void MyButton_Click(object sender, EventArgs e)
        {
            //  Dialogue window display 
            MessageBox.Show("HELLO  My first form ");
        }
 
        /**
         *  How to label 
         */
        private void label1_Click(object sender, EventArgs e)
        {
 
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            //  The attribute of this object is equal to 
            answer_label.Text = " answer ： The eight trigrams of yin and Yang , Opposites attract ";
        }

（ 3、 ... and ）： Hyperlink label （linklabel）

1：Linkcolor： The default color of hyperlinks .:

2：Activelinkcolor： The color of the hyperlink when it is clicked

3：Visitedlinkcolor： The color of hyperlinks that have been visited .

4：Linkbehavior： Hyperlink underline style

5： event ：

/**
         *  Hyperlink event 
         */
        private void linkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
        {
            //  Set the link color after clicking 
            oneLink.LinkVisited = true;
            //  open C disc （@ Is output as is ）
            System.Diagnostics.Process.Start(@"C:/");
        }
 
        private void linkLabel1_LinkClicked_1(object sender, LinkLabelLinkClickedEventArgs e)
        {
            //  Set the link color after clicking 
            linkTwo.LinkVisited = true;
            //  Open the web page 
            System.Diagnostics.Process.Start("chrome","https://guanchao.site");
        }
 
        private void Form1_Load(object sender, EventArgs e)
        {
 
        }
 
        private void linkLabel1_LinkClicked_2(object sender, LinkLabelLinkClickedEventArgs e)
        {
            //  Set the link color after clicking 
            linkTwo.LinkVisited = true;
            //  Open application 
            System.Diagnostics.Process.Start("Notepad");
        }

（ Four ）： The text box （textbox）

1： attribute

multiline： Controls whether text can span lines .

AcceptsReturn： Whether the multiline edit control allows the input of carriage return .

AcceptsTab： Whether the multiline edit control allows input Tab key .

ReadOnly： read-only

ScrollBars： For multiline controls , Show scroll bar or not .

TabIndex： Confirm that the secondary control applies Tab Indexes

PasswordChar： Display password characters

AcceptsButton： Pressing enter is equal to pressing OK （ Form event ）

2： event

Textchange event ： amount to javascript Medium Change event .

3： Method

Clear： Clear everything in the text box

Copy： Copy the selection

Cut： Cut the selected content

Paste： Replace the selected text with the cut text

ResetText： take text Property is reset to the default value

Redo： Repeat the previous operation

Redo： Undo last action

private void but_Click(object sender, EventArgs e)
        {
            string ques_str = quesBox.Text;
            string pass_str = passBox.Text;
            if (ques_str == "gc" && pass_str == "123456")
            {
                MessageBox.Show(" Successful operation ");
            }
            else {
                MessageBox.Show(" Wrong password ");               
            }
        }

（ Four ）： Radio button （RadioButton）

1： attribute ：

Checked： Whether the radio button has been selected .

C# Radio button in NAME Attributes do not need to be the same

//  Define a variable to store gender 
        public string sex;
        //  Choose male , Assign a value to the tag 
        private void boy_radio_CheckedChanged(object sender, EventArgs e)
        {
            sex = " male ";
        }
        //  Choose women , Assign a value to the tag 
        private void gr_radio_CheckedChanged(object sender, EventArgs e)
        {
            sex = " Woman ";
        }
        //  Click the confirm button to leave the event 
        private void button1_Click_1(object sender, EventArgs e)
        {
            if (boy_radio.Checked == false && gr_radio.Checked == false)
            {
                MessageBox.Show(" Please choose gender ");
            }
            else {
                MessageBox.Show(" Your difference is ："+sex);
            }
        }

（ 5、 ... and ）： Check box （CheckBox）

1： attribute ：

Checked： Whether the check button is selected .

CheckState： Component state （ Three states ）;

Check boxes are similar to radio boxes , There is no example here , Refer to the radio box .

（ 6、 ... and ）： Digital input box （NumericUpDown）

1： attribute

Increment： Click the plus sign behind once to increase the number

MiniMum： Input box minimum

MaxMum： Input box maximum

Value： The default value is

2： event

ValueChanged： Default event （ Value change ）

public int num;
        private void numericUpDown1_ValueChanged(object sender, EventArgs e)
        {
            num = Convert.ToInt32(numUpOne.Text);
            Font ff = new Font(" In black ", num);
            label4.Font = ff;
        }
 
        private void num_button_Click(object sender, EventArgs e)
        {
            int nums = num + 1;
            MessageBox.Show(" The number you entered is " + nums);
        }

（ 7、 ... and ）： Group box （GroupBox）

This is nothing , It is a partition function .

Put the functional partitions of each part .

[ Failed to transfer the external chain picture , The origin station may have anti-theft chain mechanism , It is suggested to save the pictures and upload them directly (img-iEh41uFh-1655864539618)(https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/8286432aab1e40a78f5d5d874df51090~tplv-k3u1fbpfcp-zoom-1.image#pic_center)]

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