c#：基础杂项

ylbtech_c#

1,C#弹出对话框

 MessageBox.Show(this, "请输入一个数字", "提示", MessageBoxButtons.OK, MessageBoxIcon.Stop);
                txt1.Focus();
                txt1.SelectAll();//文本框中的内容全选

MessageBox.Show(this, "留言记录添加成功，要查看留言吗？", "选择一个选项", MessageBoxButtons.YesNoCancel,MessageBoxIcon.Question);

MessageBox.Show("这里是信息");
MessageBox.Show(this, "显示的内容", "标题", MessageBoxButtons.YesNoCancel);
MessageBox.Show(this, "显示的内容", "标题", MessageBoxButtons.YesNoCancel,MessageBoxIcon.Information);

2,C#多文档窗体

MDI窗体(多文档窗体)

是否为多文档窗体
Form属性：IsMdiContainer  true|false

Form2 frm = new Form2();
            frm.MdiParent = this;//设置MDI的父窗体
            frm.Show();

3,C#枚举

ArrayList list = new ArrayList();
            list.Add("第一");
            list.Add("第二");

            //获得一个ArrayList的枚举对象
            IEnumerator ie = list.GetEnumerator();
            while (ie.MoveNext())
            {
                //ie.Current;//返回当前枚举的对象
                Console.WriteLine(ie.Current.ToString());
            }

4,C#默认画笔

Graphics g = this.CreateGraphics();//画笔

            Font f = new Font("隶书", 30, FontStyle.Bold);//字体

            LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, 10, 10), Color.Blue, Color.Blue, 1.3f);//笔刷

            g.DrawString("你好", f, brush, 100, 200);//画字符串

            g.FillEllipse(brush, 100, 100, 200, 50);//椭圆

            g.FillRectangle(brush, 200, 200, 200, 50);//矩形

            g.DrawLine(new Pen(Color.Red), 10, 10, 300, 300);//线段

5,C#随机数

Random r = new Random();
        int num = 0;//要猜的数

6,C#-图片动画

private void button1_Click(object sender, EventArgs e)
        {
            pb.Image = img.Images[0];
        }

        private void button2_Click(object sender, EventArgs e)
        {
            pb.Image = img.Images[1];
        }

 private void timer1_Tick(object sender, EventArgs e)
        {
            pb.Image = imgList.Images[index];
            index++;
            if (index > 6)
                index = 0;
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            pb.Image = imgList.Images[index];
            index++;
            if (index > 6)
                index = 0;
        }

7,C#线程

using System.Threading;//线程

private void Form1_Load(object sender, EventArgs e)
        {
            t.Start();//启动线程
        }
        public static void hello()
        {
            while (true)
            {
                Thread.Sleep(1000);
            }
        }

8,C#右键菜单事件

//ContextMenuStrip
private void Form1_MouseUp(object sender, MouseEventArgs e)
        {
            if(e.Button == MouseButtons.Right)
                cm.Show(this, e.Location);
        }

9,C#自动画笔

 public partial class Form1 : Form
    {
        LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, 10, 10), Color.Blue, Color.Blue, 1.3f);
        int x, y, width, height;
        bool isPress = false;//是否按下鼠标
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Paint(object sender, PaintEventArgs e)
        {

        }

        private void Form1_MouseDown(object sender, MouseEventArgs e)
        {
            //获得起始点(鼠标坐标)
            x = e.X;
            y = e.Y;
            isPress = true;
        }

        private void Form1_MouseMove(object sender, MouseEventArgs e)
        {
            if (isPress)
            {
                width = e.X - x;
                height = e.Y - y;

                Graphics g = this.CreateGraphics();
                g.Clear(Color.White);//清空画板，并填充颜色
                g.FillEllipse(brush, x, y, width, height);
            }
        }

        private void Form1_MouseUp(object sender, MouseEventArgs e)
        {
            isPress = false;
        }
    }

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