应用程序，窗体里拖放一个TreeView控件，想把数据库里的数据在这个控件里显示出来
TREEVIEW控件是Winfrom窗体里的 不是ASP．NET里的TREEVIEW
代码如下：
CREATE TABLE CateTable (
[ID] [int] IDENTITY (1, 1) NOT NULL ,
[CateName] [nvarchar] (50) COLLATE Chinese_PRC_CI_AS NOT NULL ,
[RootID] [int] NOT NULL ,
[ParentID] [int] NOT NULL
)
GO
存储过程：
CREATE PROCEDURE CateTable_GetList AS
BEGIN
Select
CateID,
CateName,
RootID,
ParentID
from
&n ......
后台代码：
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.IO;
public partial class User_UpLoadFile : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void UPbutton_Click(object sender, EventArgs e)
{
if (FileUpload1.HasFile)
{
string fileContentType = FileUpload1.PostedFile.ContentType;
if (fileContentType == "image/bmp" || fileContentType == "image/gif" || fileContentType == "image/pjpeg")
{
string name = FileUpload1.PostedFile.FileName; // 客户端文件路径
FileInfo file = new FileInfo(name);
string SavePath = "/upload/";
string fileExes = (System.IO.Path.GetExtension(name)).ToString().ToLower();//文件扩展名
Random ran = new Ran ......
后台代码：
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.IO;
public partial class User_UpLoadFile : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void UPbutton_Click(object sender, EventArgs e)
{
if (FileUpload1.HasFile)
{
string fileContentType = FileUpload1.PostedFile.ContentType;
if (fileContentType == "image/bmp" || fileContentType == "image/gif" || fileContentType == "image/pjpeg")
{
string name = FileUpload1.PostedFile.FileName; // 客户端文件路径
FileInfo file = new FileInfo(name);
string SavePath = "/upload/";
string fileExes = (System.IO.Path.GetExtension(name)).ToString().ToLower();//文件扩展名
Random ran = new Ran ......
微软在其.net战略中，对其主推的Web Service做了大肆的宣扬。现在，Web
Service正如火如荼地发展着，相关的各项新技术层出不穷。Web
Service的发展正构筑着互联网时代美好的明天。在本文中，我将向大家介绍Web Service的一些基本知识、如何用C＃建立一个Web
Service。通过文章，我们还将对WSDL、UDDI以及未来的Web Service有一个大致的了解。
为什么需要Web Service？
以前，分布式的应用程序逻辑需要使用分布式的对象模型，通过使用DCOM、CORBA、RMI之类的基本结构，开发人员仍可拥有使用本地模型所提供的丰富资源和精确性，并可将服务置于远程系统中。
当已经有中意的中间件平台（RMI、Jini、CORBA、DCOM
等等）时，我们为什么还要为Web而烦恼呢？中间件确实提供了强大的服务实现手段，但是，这些系统有一个共同的缺陷，那就是它们无法扩展到互联网上：它们
要求服务客户端与系统提供的服务本身之间必须进行紧密耦合，即要求一个同类基本结构。然而这样的系统往往十分脆弱：如果一端的执行机制发生变化，那么另一
端便会崩溃。例如，如果服务器应用程序的接口发生更改，那么客户端便会崩溃。为了能扩展到互联网运用，我们需要一种松散偶合的基本结构来解� ......
微软.NET战略的一个比较重要的部分就是webservice,利用webservice我们可以创建真正有效的分布式应用程序。
下面，我们对webservice做一些说明。
假设A是客户端，B是webservice服务端，用户通过http协议向服务器发送soap请求，webservice返回客户端XML格式的数据。
现在我们看一看创建一个webservice的大致过程：
服
务端的webservice是必须要建的。中间的soap,xml我们不用去关心，在客户端这边，比较重要的是如何从webservice取得对象？答案
是用的是proxy对象。客户端由代理对象(proxy)负责与webservice的通信。所以在客户端使用webservice，完全和使用一个本地
对象是一样的。
我们现在以一个简单的实例来说明。
打开vs.net,新建工程(asp.net web服务)，在位置中键入http://localhost/webserver,其中webserver就是工程的名字。确定后，出现一个Service1.asmx.cx,双击，出现代码窗口，
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Web;
using System.Web.S ......
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 ......
最新文章 : c#