public static Boolean WriteTextFile(string content, string filepath,string name)
{
FileStream fs;
StreamWriter sw;
if (!System.IO.Directory.Exists(filepath))
{
DirectoryInfo DirInfo = Directory.CreateDirectory(filepath); //创建目录
DirInfo.Attributes = FileAttributes.Normal;
}
string fullpath = filepath + name + ".txt";
if (File.Exists(fullpath))//验证文件是否存在
{
return false;
}
else
{
fs = new FileStream(fullpath, FileMode.Create, FileAccess.Write);
sw = new StreamWriter(fs,System.Text.Encoding.Default);
sw.WriteLine(content);
sw.Close();
fs.Close();
return true;
}
}
在做这个相关工作的时候 还碰到一个问题就是 用一下方法读取中文文本文件时，出现乱码的现象：
public static String ReadTextFile(string fi ......
Label——height：高度
width：宽度
backcolor：背景色
forecolor：前景色
bordercolor：边框色
borderstyle：边框样式
bordersize：边框大小
font：字体
text：label上的文字
visible：是否可见
......
1. 简述 private、 protected、 public、 internal 修饰符的访问权限。答 . private : 私有成员, 在类的内部才可以访问。 protected : 保护成员，该类内部和继承类中可以访问。 public : 公共成员，完全公开，没有访问限制。 internal: 在同一命名空间内可以访问。2 .列举ASP.NET 页面之间传递值的几种方式。 答. 1.使用 QueryString, 如....?id=1; response. Redirect().... 2.使用 Session 变量 3.使用 Server.Transfer3. 一列数的规则如下: 1、1、2、3、5、8、13、21、34...... 求第30位数是多少，用递归算法实现。答：
public class MainClass {
public static void Main() {
Console.WriteLine(Foo(30));
}
public static int Foo(int i){
if (i return 0; else if(i > 0 && i return 1; else return Foo(i -1) + Foo(i - 2);
}
}
4.C#中的委托是什么？事件是不是一种委托？答 ： 委托可以把一个方法作为参数代入另一个方法。委托可以理解为指向一个函数的引用。是，是一种特殊的委托5.override 与重载的区别答 ：override 与重载的区别。重载是方法的名称相同。参数或参数类型不同，进行多次重载以适应 ......
The C# classes that you design will be used by code that you write and possibly by code that
other people write. Your C# classes may be used by a VB.NET application or from within an
ASP.NET page. Moreover, your classes may very well be used alongside other classes
designed by other .NET developers.
Code written in a .NET language references classes by their names, and all of these classes
used together suggests an obvious dilemma: What happens if a developer wants to use two
classes that have the same name?
Suppose you write a C# class that reads records from a database and you name the class
Recordset. Code that wants to use your class may create objects as follows:
Recordset MyRecordset = new Recordset();
Now suppose that you package your classes into a .NET assembly and distribute your
assembly for use by other applications. Furthermore, suppose that someone obtains your
assembly and integrates it into his or her application. What happens if that same application
also ......
The C# classes that you design will be used by code that you write and possibly by code that
other people write. Your C# classes may be used by a VB.NET application or from within an
ASP.NET page. Moreover, your classes may very well be used alongside other classes
designed by other .NET developers.
Code written in a .NET language references classes by their names, and all of these classes
used together suggests an obvious dilemma: What happens if a developer wants to use two
classes that have the same name?
Suppose you write a C# class that reads records from a database and you name the class
Recordset. Code that wants to use your class may create objects as follows:
Recordset MyRecordset = new Recordset();
Now suppose that you package your classes into a .NET assembly and distribute your
assembly for use by other applications. Furthermore, suppose that someone obtains your
assembly and integrates it into his or her application. What happens if that same application
also ......
WebRequest mywebrq;
WebResponse mywebresp;
StreamReader sr;
Streamwriter sw;
Private void Page_Load(object sender,EventArgs e) { mywebreq=WebRequest.Create( http://localhost/Test.aspx ); mywebresp=mywebreq.GetResponse();
sr=new streamReader(mywebresp.GetResponsestream());
strHtml=sr.ReadToEnd();
sw=File.CreateText(server.mappath("Test.htm"));
sw.writeling(strHtml);
sw.close();
Response.writeFile(Server.Mappath("Test.htm"));
} ......
1. 数据库访问性能优化
数据库的连接和关闭
访问数据库资源需要创建连接、打开连接和关闭连接几个操作。这些过程需要多次与数据库交换信息以通过身份验证，比较耗费服务器资源。ASP.NET中提供了连接池(Connection Pool)改善打开和关闭数据库对性能的影响。系统将用户的数据库连接放在连接池中，需要时取出，关闭时收回连接，等待下一次的连接请求。连接池的大小是有限的，如果在连接池达到最大限度后仍要求创建连接，必然大大影响性能。因此，在建立数据库连接后只有在真正需要操作时才打开连接，使用完毕后马上关闭，从而尽量减少数据库连接打开的时间，避免出现超出连接限制的情况。
使用存储过程
存储过程是存储在服务器上的一组预编译的SQL语句，类似于DOS系统中的批处理文件。存储过程具有对数据库立即访问的功能，信息处理极为迅速。使用存储过程可以避免对命令的多次编译，在执行一次后其执行规划就驻留在高速缓存中，以后需要时只需直接调用缓存中的二进制代码即可。另外，存储过程在服务器端运行，独立于ASP.NET程序，便于修改，最重要的是它可以减少数据库操作语句在网络中的传输。
优化查询语句
ASP.NET中ADO连接� ......
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