文件操作：
private void button1_Click(object sender, EventArgs e)
{
FileStream fs;
if (File.Exists("E:\\gui_down\\gui.txt"))
fs= File.Create("E:\\gui_down\\gui.txt");
}
private void button2_Click(object sender, EventArgs e)
{
//
File.Encrypt("E:\\gui_down\\gui.txt");//加密文件,表其他用户不能访问
File.Decrypt("E:\\gui_down\\gui.txt");//解密文件
System.Security.AccessControl.FileSecurity fileScrt = new System.Security.AccessControl.FileSecurity();
File.SetAccessControl("E:\\gui_down\\gui.txt", fileScrt);//增加某个文件的访问权限，增加安全性
}
private void button3_Click(object sender, EventArgs e)
{
FileInfo file = new FileInfo("E:\\gui_down\\gui.txt");//实例化文件类，指定的文件路径作为参数
file.Create();//文件创建
}
private void button4_Click(object sender, EventArgs e)
{
string path;
DialogResult result = openFileDialog1.ShowDialog();//打开对话框
if (result == DialogResult.OK)
{
path = openFileDialog1.FileName;
textBox1.Text = path;
}
}
private void fileSystemWatcher1_Changed(object sender, FileSystemEventArgs e)//文件监视器
{
MessageBox.Show("E:\\gui_down\\gui.txt"+" changed");
}
private void button5_Click(object sender, EventArgs e)
{
FileStream fs = File.Create("E:\\gui_down\\feg.bin");//创建文件 返回的是文件流
string line = "this is a test line.";
UnicodeEncoding ue = new UnicodeEncoding();//编码类
byte[] str = ue.GetBytes(line);//获取二进制流
fs.Write(str, 0, str.Length);//用文件流对文件 读写
fs.Close();//关闭文件流
}
private void button6_Click(object sender, EventArgs e)
{
FileStream fs = new FileStream("E:\\gui_down\\feg.bin", FileMode.Open,FileAccess.ReadWrite);
byte[] str = new byte[1024];
fs.Read(str, 0, str.Length);//将文件读取到流中
fs.Close();
UnicodeEncoding ue = new UnicodeEncoding();
string line = ue.GetString(str);
MessageBox.Show(line);
}
private void button7_Click(object sender, EventArgs e)
{
FileStream fs = new FileStream("E:\\gui_down\\gui.txt", FileMode.Append, FileAccess.Write);
BufferedStream bs = new BufferedStream(fs);
UnicodeEncoding ue = new UnicodeEncoding();
byte[] str = new byte[1024];
string line = "你好";
str = ue.GetBytes(line);
//加密,sha不可逆加密
System.Security.Cryptography.SHA1Managed sha = new System.Security.Cryptography.SHA1Managed();
byte[] shastr = new byte[1024];
shastr = sha.ComputeHash(str);
bs.Write(shastr,0,shastr.Length);
bs.Close();
fs.Close();
}
private void button8_Click(object sender, EventArgs e)
{
FileStream fs = new FileStream("E:\\gui_down\\gui.txt", FileMode.Append, FileAccess.Write);
BufferedStream bs = new BufferedStream(fs);//缓冲流
StreamWriter sw = new StreamWriter(bs);//写入流
string line = "你好";
// UnicodeEncoding ue = new UnicodeEncoding();
// byte[] str = new byte[1024];
// str = ue.GetBytes(line);
sw.WriteLine(line);
sw.Close();
bs.Close();
fs.Close();
}
private void button9_Click(object sender, EventArgs e)
{
FileStream fs = new FileStream("E:\\gui_down\\g.txt",FileMode.Open,FileAccess.Write);
DeflateStream deflate = new DeflateStream(fs,CompressionMode.Compress);//deflate文件压缩
System.IO.Compression.GZipStream gzip = new GZipStream(fs, CompressionMode.Compress);//gzip文件压缩
}
private void button10_Click(object sender, EventArgs e)
{
ArrayList at = new ArrayList();
for(int i = 0;i<100;i++)
at.Add(i);
FileStream fs = File.Create("E:\\gui_down\\g1.txt");
//二进制序列化，目的是将内存中的内容存入本地
System.Runtime.Serialization.Formatters.Binary.BinaryFormatter bf = new BinaryFormatter();
bf.Serialize(fs,at);
fs.Close();
}
private void button11_Click(object sender, EventArgs e)
{
FileStream fs = File.Open("E:\\gui_down\\g1.txt", FileMode.Open);
BinaryFormatter bin = new BinaryFormatter();
ArrayList list;
list = (ArrayList)bin.Deserialize(fs);
fs.Close();
MessageBox.Show(list.Count.ToString());
MessageBox.Show(list[2].ToString());
}
private void button12_Click(object sender, EventArgs e)
{
FileStream fs = File.Create("E:\\gui_down\\g2.xml");
ArrayList at = new ArrayList();
for (int i = 0; i < 100; i++)
at.Add(i);
System.Runtime.Serialization.Formatters.Soap.SoapFormatter soap = new SoapFormatter();//soap序列化
soap.Serialize(fs, at);
fs.Close();
}
private void button13_Click(object sender, EventArgs e)
{
FileStream fs = File.Create("E:\\gui_down\\g3.xml");
ArrayList at = new ArrayList();
for (int i = 0; i < 100; i++)
at.Add(i);
System.Xml.Serialization.XmlSerializer xml= new XmlSerializer(typeof(ArrayList));//xml序列化
xml.Serialize(fs,at);
fs.Close();
}
private void button14_Click(object sender, EventArgs e)
{
Employee emp = new Employee("gui", 21, 20000);
FileStream fs = File.Create("E:\\gui_down\\g4.xml");
SoapFormatter soap = new SoapFormatter();//必须对指定可序列化的对象而言，若是自己创建的类，可以在类开头申明为可序列化
soap.Serialize(fs, emp);//序列化只对指定的类的数据成员进行
fs.Close();
}
private void button15_Click(object sender, EventArgs e)
{
Employee emp;
FileStream fs = File.Open("E:\\gui_down\\g4.xml", FileMode.Open);
SoapFormatter soap = new SoapFormatter();
emp = (Employee)soap.Deserialize(fs);//反序列化 除了要知道文件路径以外，还要知道被序列化的类型(Employee)
fs.Close();
MessageBox.Show(emp.Name);
//对于soap序列化的问题，可以在设计方法上用接口实现仅被序列化的类，使得引用中其他的类不公开
}
[SerializableAttribute]//可序列化
public class Employee
{
private string name;
public string Name
{
get { return name; }
set { name = value; }
}
private int age;
[NonSerialized]//该数据成员部能被序列化
private int saray;
public Employee(string n,int a,int s)
{
this.name =n;
this.age = a;
this.saray = s;
}
}
