C#笔记

入门

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Test{
    class Program{
        static void Main(string[] args){
            string s=string.Empty;
            Console.Title="Title"; //控制台标题
            Console.WriteLine("Hello World!");
            s=Console.ReadLine();
        }
    }
}

Char类常用方法

IsDigit IsLetter IsLetterOrDigit IsLower IsNumber IsPunctuation IsSeparator IsUpper IsWhiteSpace Parse ToLower ToString ToUpper TryParse

多级转义

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Console.WriteLine(@"..."); //不需要转义字符进行转义

动态常量

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class Program{
    readonly int Price;
    Programe(){
        Price=368;
    }
    static void Main(string[] args){}
}

Convert类常用方法

ToBoolean ToByte ToChar ToDateTime ToDecimal ToDouble ToInt32 ToInt64 ToSByte ToSingle ToString ToUInt32 ToUInt64

数组

一维数组

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int[] arr=new int[5];
for(int i=0;i<arr.Length;i++){
    arr[i]=i+1;
}

二维数组

以下两种方法均可。

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int[,] a=new int[2,4];

int[][] a=new int[2][];
a[0]=new int[2];
a[1]=new int[3];

foreach

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string[] roles={"a","b",...};
foreach(string role in roles){
    Console.WriteLine(role+" ");
}

List

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List<string> list=new List<string>();
list.Add("...");

Sort

从小到大，只能为一维数组。

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public static void Sort(Array array)
public static void Sort(Array array,int index,int length)
/*
    index:排序范围内的起始索引
    length:排序范围内的元素数
*/

int[] arr=new int[]{3,9,27,6,18,12,21,15};
Array.Sort(arr);

Reverse

用法同上。

字符串

IndexOf

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public int IndexOf(char value)
public int IndexOf(string value)
public int IndexOf(char value,int startIndex)
public int IndexOf(string value,int startIndex)
public int IndexOf(char value,int startIndex,int count)
public int IndexOf(string value,int startIndex,int count)
/*
    value:要检索的字符或字符串
    startindex:搜索起始位置
    count:要检查的字符位置数
*/

string str="We are the world";
int size=str.IndexOf('e'); //1

string str="We are the world";
int firstIndex=str.IndexOf("r");
int secondIndex=str.IndexOf("r",firstIndex+1);
int thirdIndex=str.IndexOf("r",secondIndex+1);

LastIndexOf

用法同上。

StartsWith

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public bool StartsWith(string value)
public bool StartsWith(string value,bool ignoreCase,CultureInfo culture)
/*
    value:要比较的字符串
    ignoreCase:忽略大小写为true，否则false
    culture:确定如何对字符串与value进行比较的区域性信息
*/

string str="Keep on ...";
bool result=str.StartsWith("keep",true,null);

Equals

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public bool Equals(string value)
public static bool Equals(string a,string b)

string pwd=Console.ReadLine();
if(pwd.Equals("aaa")){
    //...
}

ToUpper/ToLower

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Console.WriteLine(str.ToUpper());
Console.WriteLine(str.ToLower());

Format

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Console.WriteLine(string.Format("aaa{0:D}",1234));//1234
Console.WriteLine(string.Format("aaa{0:C}",5201));//货币形式 不包括小数 0表示第1个参数 ￥5,201.00
Console.WriteLine(string.Format("aaa{0:E}",120000.1));//科学计数法 1.200001E+005
Console.WriteLine(string.Format("aaa{0:N0}",12800));//分隔符显示 第2个0表示保留0位小数点 12,800
Console.WriteLine(string.Format("aaa{0:F2}",Math.PI));//小数点后2位 3.14
Console.WriteLine(string.Format("aaa{0:X4}",33));//16进制 0021
Console.WriteLine(string.Format("aaa{0:P0}",0.01))//百分号 1%
int money=1298;
Console.WriteLine(money.ToString("C"));
    
DateTime strDate=DateTime.Now;
Console.WriteLine(string.Format("{0:d}",strDate));//短日期
Console.WriteLine(string.Format("{0:D}",strDate));//长日期
Console.WriteLine(string.Format("{0:f}",strDate));//长日期短时间
Console.WriteLine(string.Format("{0:F}",strDate));//长日期长时间
Console.WriteLine(string.Format("{0:g}",strDate));//短日期短时间
Console.WriteLine(string.Format("{0:G}",strDate));//短日期短时间
Console.WriteLine(string.Format("{0:M}",strDate));//月日 或m
Console.WriteLine(string.Format("{0:t}",strDate));//短时间
Console.WriteLine(string.Format("{0:T}",strDate));//长时间
Console.WriteLine(string.Format("{0:Y}",strDate));//年月 或y
DateTime dTime=DateTime.Now;
Console.WriteLine(dTime.ToString("Y"));

Substring

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public string Substring(int startIndex);
public string Substring(int stratIndex,int length);

string strFile="Program.cs";
string strFileName=strFile.Substring(0,strFile.IndexOf('.'));
string strExtension=strFile.Substring(strFile.IndexOf('.'));

Split

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char[] separator={','};
string[] splitStrings=str.Split(separator,StringSplitOptions.RemoveEmptyEntries);
for(i=0;i<splitStirng.Length;i++){
    Console.WriteLine(splitStirng[i]);
}

Trim

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string shortStr=str.Trim();

Replace

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string strOld="...";
string strNew1=strOld.Replace(',','*');
string strNew2=strOld.Replace("one","One");

StringBuilder

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StringBuilder SBuilder=new StringBuilder("...");
int Num=368;
SBuilder.Append("...");//追加
SBuilder.AppendFormat("{0:C0}",Num);
SBuilder.Insert(0,"...");//开头追加
SBuilder.Remove(14,SBuilder.Length-14);//删除索引14以后的字符串
SBuilder.Replace("...","...");
Console.WriteLine(SBuilder);

OOP

类的属性

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class Program{
    private int age;
    public int Age{
        get{
            return age;
        }
        set{
            if(value>0&&value<70)
                age=value;
            else
                Console.WriteLine("非法");
        }
    }
    public string FullName{ //使用自动实现属性
        get;set;
    }
    static void Main(string[] args){
        Program p=new Program();
        while(true)
            p.Age=Convert.ToInt16(Console.ReadLine());
    }
}

构造/析构函数

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public class Program{
    static Program(){//只能访问静态变量
        Console.WriteLine("a");
    }
    private Program(){
        Console.WriteLine("b");
    }
    static void Main(string[] args){
        Program p1=new Program(); //调用静态构造函数 只调用一次
        Program p2=new Program(); //调用第二个构造函数
    }
    ~Program(){}
}

方法参数

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class Program{
    private int Add(int x,int y){
        x=x+y;
        return x;
    }
    private int Add(ref int x,int y){
        x=x+y;
        return x;
    }
    private int Add(int x,int y,out int z){
        z=x+y;
        return z;
    }
    private int Add(params int[] x){
        int result=0;
        for(int i=0;i<x.Length;i++)
            result+=x[i];
        return result;
    }
    static void Main(string[] args){
        Program pro=new Program();
        int x=30,y=40,z;
        Console.WriteLine(pro.Add(x,y)); //x y不改变
        Console.WriteLine(pro.Add(ref x,y)); //x被改变为70
        Console.WriteLine(pro.Add(x,y,out z)); //z的值被改变 与ref不同 z可以定义后没有赋初始值
        Console.WriteLine(pro.Add(20,30,40,50,60)); //多个参数打包为数组
        return;
    }
}

继承/重写

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class Computer{
    public string sayHello(){
        return "a";
    }
}
class Pad:Computer{ //Pad继承于Computer 不支持多类继承
    public new string sayHello(){
        return base.sayHello()+"b"; //调用基类方法
    }
}
class Program{
    static void Main(string[] args){
        //两者sayHello不同
        Computer pc=new Computer();
        Pad ipad=new Pad();
    }
}

虚方法及其重写

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class Vehicle{
    string name;
    private int value;
    public string Name{
        get{return name;}
        set{name=value;}
    }
    public virtual void Move(){
        Console.WriteLine("{0}a",Name);
    }
}
class Train:Vehicle{
    public override void Move(){
        Console.WriteLine("{0}b",Name);
    }
}
class Car:Vehicle{
    public override void Move(){
        Console.WriteLine("{0}c",Name);
    }
}
class Program{
    static void Main(string[] args){
        Vehicle vehicle=new Vehicle();
        Train train=new Train();
        Car car=new Car();
        vehicle[] vehicles={vehicle,train,car};
        vehicle.Name="1";
        train.Name="2";
        car.Name="3";
        vehicle[0].Move(); //1a
        vehicle[1].Move(); //2b
        vehicle[2].Move(); //3c
        return;
    }
}

抽象/接口

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public abstract class Market{
    public string Name{get;set;}
    public string Goods{get;set;}
    public abstract void Shop();
}
interface Information{
    string Code{get;set;}
    string Name{get;set;}
    void ShowInfo();
}
比较项 抽象类 接口
方法 可以有非抽象方法 所有方法都是抽象方法
属性 属性中可以有非静态变量 所有属性都是静态变量
构造函数 有构造函数 没有构造函数
继承 一个类只能继承一个父类 一个类可以同时实现多个接口
被继承 一个类可以被多个子类继承 一个接口可以同时继承多个接口

Windows控件

窗体

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Application.Run(new Form1()); //启动窗体

Form2 frm2=new Form2();
frm2.Show();
this.Hide();

MDI窗体

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Form2 frm2=new Form2();
frm2.MdiParent=this;
frm2.Show();
Form3 frm3=new Form3();
frm3.MdiParent=this;
frm3.Show();
LayoutMdi(MdiLayout.TileHorizontal); //水平平铺
LayoutMdi(MdiLayout.TileVertical); //垂直平铺
LayoutMdi(MdiLayout.Cascade); //层叠排列

//FormChild实现不重复打开同一个子窗体
FormChild formChild=new ForChild();
bool isOpened=false;
foreach(Form form in this.MdiChildren){ //循环所有已打开的子窗口
    if(formChild.Name==form.Name){ //如果已经打开
        formChild.Activate(); //激活该子窗口
        formChild.StartPosition=FormStartPosition.CenterParent;
        formChild.WindowState=FormWindowState.Normal;
        isOpened=true;
        formChild.Dispose(); //销毁FormChild实例 以防被再次遍历到
        break;
    }
}
if(!isOpened){ //没打开
    formChild.MdiParent=this;
    formChild.Show();
}

Label

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label1.Text="...";
label1.Visible=true;

TextBox

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textBox1.ReadOnly=true;
textBox1.PasswordChar='*';
textBox1.Multiline=true;
label1.Text=textBox1.Text;

RadioButton

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radioButton1_CheckedChanged(...)

if(radioButton1.Checked){
    //...
}

CheckBox

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string strPop="";
foreach(Control ctrl in this.Controls){
    if(ctrl.GetType().Name=='CheckBox'){
        CheckBox cBox=(CheckBox)ctrl;
        if(cBox.Checked){
            strPop+="\n"+cBox.Text;
        }
    }
}
MessageBox.Show(strPop);

RichTextBox

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richTextBox1.Multiline=true; //多行显示
richTextBox1.ScrollBar=RichTextBoxScrollBars.Vertical; //其他：Both None Horizontal Vertical ForcedHorizontal ForcedVertical ForcedBoth
richTextBox1.SelectionFont=new Font("楷体",12,FontStyle.Bold);
richTextBox1.SelectionColor=System.Drawing.Color.Red;
richTextBox1.SelectionBullet=true; //添加项目列表符号

private void Form1_Load(object sender,EventArgs e){
    richTextBox1.Text="http://www.baidu.com";
}
private void richTextbox1_LinkClicked(object sender,LinkClickedEventArgs e){
    System.Diagnostics.Process.Start(e.LinkText);
}

ComboBox

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private void Form1_Load(object sender,EventArgs e){
    combox1.DropDownStyle=ComboBoxStyle.DropDownList; //下拉且不能直接编辑 其他选项： Simple列表部分总可见 DropDown下拉可直接编辑
    string[] str=new string[]{"a","b","c","d","e","f"};
    comboBox1.DataSource=str;
    comboBox1.SelectedIndex=0;
    return;
}
private void comboBox1_SelectedIndexChanged(object sender,EventArgs e){
    label2.Text=comboBox1.SelectedItem;
}

ListBox

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listBox1.Items.Add("aaa");
listBox1.Items.Remove("aaa");
listBox1.HorizontalScrollbar=true;
listBox1.ScrollAlwaysVisible=true;
listBox1.SelectionMode=SelectionMode.MultiExtended; //可选用Shift/Ctrl+方向键选择多项 其他：MultiSimple可选多项 None无法选择 One只选一项

GroupBox

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groupBox1.Text="aaa"; //设置控件标题

ListView

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listView1.Items.Add("aaa");
listView1.Items.RemoveAt(listView1.SelectedItems[0].Index); //移除选中项
listView1.Items.Clear();
listView1.Items[2].Selected=true;
listView1.LargeImageList=imageList1; //imageList1为一个ImageList控件
listView1.SmallImageList=imageList1;
listView1.Items[0].ImageIndex=0; //第一项图标索引为imageList1中第0个
listView1.Items[1].ImageIndex=1;

listView1.Groups.Add(new ListViewGroup("aaa",_HorizontalAlignment.Left));
listView1.Groups.RemoveAt(1);
listView1.Groups.Clear();
listView1.Items[0].Group=listView1.Groups[0]; //第一项分配到第一组中

TreeView/ContextMenuStrip

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private void Form1_Load(object sender,EventArgs e){
    treeView1.ContextMenuStrip=contextMenuStrip1; //contextMenuStip1是个ContextMenuStrip控件 设置右键快捷菜单
    TreeNode TopNode=treeView1.Nodes.Add("a"); //顶级节点
    TreeNode ParentNode1=new TreeNode("b"); //基础节点
    TopNode.Nodes.Add(ParentNode1);
    TreeNode ChildNode1=new TreeNode("c"); //子节点
    ParentNode1.Nodes.Add(ChildNode1);
    imageList1.Images.Add(Image.FromFile("1.png"));
    imageList1.Images.Add(Image.FromFile("2.png"));
    treeView1.ImageList=imageList1;
    imageList1.ImageSize=new Size(16,16);
    treeView1.ImageIndex=0;
    treeView1.SelectedImageIndex=1;
    return;
}
private void treeView1_AfterSelect(object sender,TreeViewEventArgs e){
    label1.Text=e.Node.Text;
}
private void 全部展开ToolStripMenuItem_Click(object sender,EventArgs e){
    treeView1.ExpandAll();
}
private void 全部折叠ToolStripMenuItem_Click(object sender,EventArgs e){
    treeView1.CollapseAll();
}

Timer

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if(timer1.Enabled){ //是否正在运行
    //...
}
timer1.Interval=1; //间隔1ms
timer1.Start(); //启动计时器
timer1.Stop(); //停止计时器
private void timer1_Tick(object sender,EventArgs e){ //触发一次
    Random rnd=new Random();
    label1.Text=rnd.Next(1,33).ToString("00");
    return;
}

MessageBox

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DialogResult ret=MessageBox.Show("aaa","bbb",MessageBoxButtons.YesNo,MessageBoxIcon.Warning);

MessageBoxButtons枚举值：MessageBoxButtons.OK MessageBoxButtons.OKCancel MessageBoxButtons.AbortRetryIgnore MessageBoxButtons.YesNoCancel MessageBoxButtons.YesNo MessageBoxButtons.RetryCancel

MessageBoxIcon枚举值：MessageBoxIcon.None MessageBoxIcon.Question MessageBoxIcon.Exclaimation MessageBoxIcon.Asterisk MessageBoxIcon.Stop MessageBoxIcon.Error MessageBoxIcon.Warning MessageBoxIcon.Information

DialogResult枚举值：DialogResult.None DialogResult.OK DialogResult.Cancel DialogResult.Abort DialogResult.Retry DialogResult.Ignore DialogResult.Yes DialogResult.No

OpenFileDialog

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openFileDialog1.InitialDirectory="C:\\";//初始目录
openFileDialog1.Filter="bmp文件(*.bmp)|*.bmp|gir文件(*.gif)|*.gif";//文件名筛选器
openFileDialog1.ShowDialog();
string strName=openFileDialog1.Filename;
其他属性 描述
AddExtension 用户省略扩展名时是否在文件名中添加扩展名。
DefaultExt 默认文件扩展名。
FileNames 获取所有选定文件的文件名。
Multiselect 是否允许选择多个文件。
RestoreDirectory 对话框关闭前是否还原当前目录。
其他方法 描述
OpenFile 以只读模式打开选择的文件。

SaveFileDialog

同上。

FolderBrowserDialog

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folderBrowserDialog1.ShowNewFolderButton=false;//不显示新建文件夹按钮
if(folderBrowserDialog1.ShowDialog()==DialogResult.OK){
    textBox1.Text=folderBrowserDialog1.SelectedPath;
}
其他属性 说明
Description 显示的说明文本。
RootFolder 开始浏览的根文件夹。

I/O

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using System.IO;

File

Exists

确定指定的文件是否存在。权限不够也返回false。

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bool ret=File.Exists("C:\\Test.txt");

Create

创建文件。

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File.Create("C:\\Test.txt");

Copy

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File.Copy("C:\\Test.txt","D:\\Test.txt");

Move

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File.Move("C:\\Test.txt","D:\\Test.txt");

Delete

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File.Delete("C:\\Test.txt");

FileInfo

Exists

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FileInfo finfo=new FileInfo("C:\\Test.txt");
if(finfo.Exists){
    //...
}

Create

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FileInfo finfo=new FileInfo("C:\\Test.txt");
finfo.Create();

CopyTo

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FileInfo finfo=new FileInfo("C:\\Test.txt");
finfo.CopyTo("D:\\Test.txt",true);//true表示存在则改写

MoveTo

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FileInfo finfo=new FileInfo("C:\\Test.txt");
finfo.MoveTo("D:\\Test.txt");

Delete

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FileInfo finfo=new FileInfo("C:\\Test.txt");
finfo.Delete();

详细信息

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private void button1_Click(object sender,EventArgs e){
    if(openFileDialog1.ShowDialog()==DialogResult.OK){
        textBox1.Text=openFileDialog1.Filename;
        FileInfo finfo=new FileInfo(textBox1.Text);
        string strCTime=finfo.CreateionTime.ToShortDateString();
        string strLATime=finfo.LastAccessTime.ToShortDateString();
        string strLWTime=finfo.LastWriteTime.ToShortDateString();
        string strName=finfo.Name;
        string strFName=finfo.FullName;
        string strDName=finfo.DirectoryName;
        string strISRead=finfo.IsReadOnly.ToString();
        long lgLength=finfo.Length;
    }
}

Directory

Exists

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Directory.Exists("C:\\Test");

CreateDirectory

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DirectoryInfo.CreateDirectory("C:\\Test")

Move

只能在同一盘根目录下。

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Directory.Move("C:\\Test","C:\\aaa\\Test");

Delete

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Directory.Delete("C:\\Test");

DirectoryInfo

Exists

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DirectoryInfo dinfo=new DirectoryInfo("C:\\Test");
if(dinfo.Exists){
    //...
}

CreateDirectory

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DirectoryInfo dinfo=new DirectoryInfo("C:\\Test");
dinfo.Create();

MoveTo

只能在同一盘根目录下。

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DirectoryInfo dinfo=new DirectoryInfo("C:\\Test");
dinfo.MoveTo("C:\\aaa\\Test");

Delete

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DirectoryInfo dinfo=new DirectoryInfo("C:\\Test");
dinfo.Delete();

FileSystemInfo

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DirectoryInfo dinfo=new DirectoryInfo("...");
FileSystemInfo[] fsinfos=dinfo.GetFileSystemInfos();
foreach(FileSystemInfo fsinfo in fsinfos){
    if(fsinfo is DirecotryInfo){
        DirectoryInfo dirinfo=new DirectoryInfo(fsinfo.Fullname);
        //...
    }
    else{
        FileInfo finfo=new FileInfo(fsinfo.FullName);
        //...
    }
}

StreamWriter/StreamReader

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StreamWriter sw=new StreamWriter("...",true);
sw.WriteLine("...");
sw.Close();

StreamReader sr=new StreamReader("...");
string str=sr.ReadToEnd();
sr.Close();

GDI+

Image

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private void Form1_Paint(object sender,PaintEventArgs e){
    Image myImage=Image.FromFile("*.jpg");
    Graphics myGraphics=this.CreateGraphics();
    myGraphics.DrawImage(myImage,50,20,90,92);
}

Bitmap

绘制出的图像可以自动刷新。

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Bitmap bmp=new Bitmap(120,80);
Graphics g=Graphics.FromImage(bmp);
Pen myPen=new Pen(Color.Green,3);
g.DrawEllipse(myPen,50,10,120,80);
this.BackgroundImage=bmp;

异常处理

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static int MyInt(string a,string b){
    int int1,int2,num;
    try{
        int1=int.Parse(a);
        int2=int.Parse(b);
        if(int2==0){
            throw new DivideByZeroException();
        }
        num=int1/int2;
        return num;
    }
    catch(DivideByZeroException de){
        Console.WriteLine(de.Message);
    }
    catch(Exception ex){
        Console.WriteLine(ex);
    }
    finally{
        return 0;
    }
}

Socket

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using System.Net;

Dns/IPAddress/IPHostEntry

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string localname=Dns.GetHostName();//获取本机名
IPAddress[] ips=Dns.GetHostAddresses(localname);//获取本机所有IP
foreach(IPAddress ip in ips)
    if(!ip.IsIPv6SiteLocal)//不是IPv6地址
        localip=ip.ToString();//获取本机IP地址

try{
    IPHostEntry host=Dns.GetHostEntry("192.168.1.50");
    name=host.HostName.ToString();//目标主机名
}
catch(Exception ex{
    MessageBox.Show(ex.Message);
}

TcpClient/TcpListener实战

Server:

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namespace Server{
    class Program{
        static void Main(){
            int port=888;
            TcpClient tcpClient;
            IPAddress[] serverIP=Dns.GetHostAddresses("127.0.0.1");
            IPAddress localAddress=serverIP[0];
            TcpListener tcpListener=new TcpListener(localAddress,port);
            tcpListener.Start();
            //服务器启动成功
            while(true){
                try{
                    tcpClient=tcpListener.AcceptTcpClient();
                    NetworkStream networkStream=tcpClient.GetStream();
                    BinaryReader reader=new BinaryReader(networkStream);
                    BinaryWriter writer=new BinaryWriter(networkStream);
                    while(true){
                        try{
                            string strReader=reader.ReadString();
                            string[] strReaders=strReader.Split(new char[]{' '});//strReaders[0]为客户端IP [1]为消息
                            //...
                            writer.Write("...");//发送消息
                        }
                        catch{
                            break;
                        }
                    }
                }
                catch{
                    break;
                }
            }
        }
    }
}

Client:

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namespace Client{
    class Program{
        static void Main(string[] args){
            TcpClient tcpClient=new TcpClient();
            tcpClient.Connect("127.0.0.1",888);//连接服务器IP地址及端口
            if(tcpClient!=null){
                //连接成功
                NetworkStream networkStream=tcpClient.GetStream();
                BinaryReader reader=new BinaryReader(networkStream);
                BinaryWriter writer=new BinaryWriter(networkStream);
                string localip="127.0.0.1";
                IPAddress[] ips=Dns.GetHostAddresses(Dns.GetHostName());
                foreach(IPAddress ip in ips)
                    if(!ip.IsIPv6SiteLocal)
                        localip=ip.ToString();
                writer.Write(localip+" ...");//发送消息
                while(true){
                    try{
                        string strReader=reader.ReadString();
                        if(strReader!=null)
                            Console.WriteLine(strReader);//接收到的消息
                    }
                    catch{
                        break;
                    }
                }
            }
            //连接失败
        }
    }
}

UdpClient

Server:

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namespace Server{
    class Program{
        static UdpClient udp=new UdpClient();
        static void Main(string[] args){
            udp.Connect("127.0.0.1",888);
            while(true){
                Thread thread=new Thread(()=>{
                    try{
                        Byte[] sendBytes=Encoding.Default.GetBytes("("+DateTime.Now.ToLongTimeString()+")...");//发送消息
                        udp.Send(sendBytes,sendByes.Length);
                    }
                    catch(Exception ex){
                        Console.WriteLine(ex.Message);
                    }
                });
                thread.Start();
                Thread.Sleep(1000);
            }
        }
    }
}

Client:

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namespace Client{
    public partial class Form1:Form{
        public Form1(){
            InitializeComponent();
            CheckForIllegalCrossThreadCalls=false;//其他线程中可以调用主窗体控件
        }
        bool flag=true;
        UdpClient udp;
        Thread thread;
        private void button1_Click(object sender,EventArgs e){
            udp=new UdpClient(888);
            flag=true;
            IPEndPoint ipendpoint=new IPEndPoint(IPAddress.Any,888);
            thread=new Thread((=>{
                while(flag){
                    try{
                        if(udp.Available<=0)//是否有网络数据
                            continue;
                        if(udp.Client==null)
                            return;
                        byte[] bytes=udp.Recieve(ref ipendpoint);
                        string str=Encoding.Default.GetString(bytes);//接收到的消息
                    }
                    catch(Exception ex){
                        MessageBox.Show(ex.Message);
                    }
                    Thread.Sleep(1000);
                }
            }));
            thread.Start();
        }
        private void button2_Click(object sender,EventArgs e){
            flag=false;
            if(thread.ThreadState==ThreadState.Running)
                thread.Abort();
            udp.Close();
        }
    }
}

Thread

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using System.Threading;

Start

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public partial class Form1:Form{
    public Form1(){
        InitializeComponent();
        CheckForIllegalCrossThreadCalls=false;
    }
    void Roll(){
        Thread.Sleep(1000);//线程休眠1000ms
        th2.Join();//线程th1暂停th2开始
        //th2.Join(1000); 等待线程th2退出或1000ms后自动退出
        lock(this){//线程同步法一
            //...
        }
        Monitor.Enter(this);//法二
        //...
        Monitor.Exit(this);
        Mutex myMutex=new Mutex(this);//法三
        myMutex.WaitOne();
        //...
        myMutex.ReleaseMutex();
        //...
    }
    private void Form1_Load(object sender,EventArgs e){
        Thread th1=new Thread(new ThreadStart(Roll));
        th1.Name="线程一";
        th1.Priority=ThreadPriority.Lowest;//BelowNormal Normal AboveNormal Highest
        th1.Start();
        //Thread th2=...;
        //th2.Start();
        th1.Suspend();//挂起
        th1.Resume();//恢复挂起的进程
    }
     private void Form1_FormClosing(object sender,EventArgs e){
         if(th1.ThreadState==ThreadState.Running)
             th1.Abort();
     }
}