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1. 获取“我的文档”等一些系统文件夹路径
MessageBox.Show(Environment.GetFolderPath(Environment.SpecialFolder.Personal));
2. 确定当前运行的系统
OperatingSystem os = Environment.OSVersion;
MessageBox.Show(os.Version.ToString());
MessageBox.Show(os.Platform.ToString());
3. 模拟触发buttonclick事件
button1.PerformClick();
4. 创建一个可改变大小没有标题栏的窗体
form1.Test = string.Empty;
form1.ControlBox = false;
5. 如何在.NET的Windows窗体上启用XP主题集？（How to use XP Themes with Windows Forms using the .NET?）
确认你的控件中FlatStyle属性已经修改为System，再修改Main方法。
static void Main()
{
Application.EnableVisualStyles();
Application.DoEvents();
Application.Run(new Form1());
}
6. 为一个窗体设置一个默认按钮
form1.AcceptButton = button1;
7. 为一个窗体设置一个取消按钮
form1.CancelButton = button1;
8. 用现有可用字体绑定到ComboBox控件
comboBox1.Items.AddRange(FontFamily.Families);
9. 清理语句
private bool Disposed;
private void Disposed()
{
if(Disposed)
return;
Disposed = true;
GC.SuppressFinalize(this);
}
10. 声明索引属性
public String this[String name]
{
get
{
retrun (String) lookuptable[name];
}
}
11. 访问索引属性
String s = Request.QueryString["Name"];
String value = Request.Cookies["Key"];
12. 声明简单属性
public string name
{
get
{
....
return......;
}
set
{
.......=value;
}
}
13. 声明和使用枚举
// Declare the Enumeration
public enum MessageSize
{
Small = 0,
Medium =1,
Large = 2
}
// Creat a Field or Property
public MessageSize msgsize;
// Assign to the property using the Enumeration values
msgsize = Small;
14. 枚举集合
foreach (String s in coll) {
}
15. 声明和使用方法
// Declare a void return function
void voidfunction() {
.......
}
// Declare a function tha retruns a value
String stirngfunction() {
.............
return (String) val;
}
// Declare a function that takes and returns values
String parmfunction(String a , String b) {
.........
return (String) (a + b);
}
// Use the Functions
voidfunction();
String s1 = stringfunction();
String s2 = parmfunction("Hello","World!");
16. 自定义特性
// Stand-alone attribute
[STAThread]
// Attribute with parameters
[DllImport("ADVAPI32.DLL"]
// Attribute with named parameters
[DllImport("KERNEL32.DLL",CharSet = CharSet.Auto)]
17. 数组
String[] a = new String[3];
a[0] ="1";
a[1] ="2";
a[2] = "3";
String[][] a = new String[3][3];
a[0][0] = "1";
a[1][0] = "2";
a[2][0] = "3";
18. 初始化
String s= "Hello , World!";
int i = 2;
double[] a = {3.00,4.00,5.00};
19. If 语句
if(Request .QueryString != null) {
......
}
20. Case语句
switch (FirstName) {
case "John" :
......
break;
case"Paul" :
..........
break;
case"Ringo" :
.........
break;
dafault :
...........
break;
}
21. For 循环
for ( int i = 0; i < 3; i++)
a(i) = "test";
22. While 循环
int i = 0;
while( i < 3)
Console.WriteLine(i.ToString());
i += 1;
}
23. 异常处理
try{
// Code that throws exceptions
} catch(OverflowException e) {
//Catch a specific exception
} catch(Exception e) {
// Catch the generic exceptions
} finally {
// Execute some cleanup code
}
24. 字符串处理
// Using Strings
String s1;
String s2 = "hello":
s2 += "World";
s1 = s2 + "!!!!!";
//Using StringBuilder class for performance
StringBuilder s3 = new StringBuilder();
s3.Append("hello");
s3.Append(" world");
s3.Append(" !!!!");
25. 事件处理程序委托
void MyButton_Click(Object sender, EventArgs) {
..............
}
26. 声明事件
// Creat a public event
public event EventHandler MyEvent;
// Creat a method for firing the event
protected void OnMyEvent (EventArgs e) {
MyEvent (this , e);
}
27. 向事件添加事件处理程序或从事件移除事件处理程序
Control .Change += new EventHandler(this.ChangeEventHandler);
Control.Change -= newEventHandler(this.ChangeEventHandler):
28. 强制类型转换
MyObject obj = (MyObject) Session["Some Value"];
IMyObject iobj = obj;
29.转换
int i = 3;
String s = i.ToString();
double d = Double.Parse(s);
30. 带继承的类定义
using System;
namespace MySpace {
public class Foo : Bar {
int x;
public Foo() { x = 4;}
public void Add(int x) { this.x +=x;}
override public int GetNum() { return x; }
}
}
// csc /out : librarycs.dll / t :library
// library.cs
31. 实现接口
public class MyClall : IEnumerable {
...............
IEnumerator IEnumerable.GetEnumerator () {
...............
}
}
32. 带 Main 方法的类定义
using System;
public class ConsoleCS {
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