博客园-beyondjay

Rendering n-column tables using the Repeater control（转载）

Tony Zhou — Tue, 12 Aug 2008 07:31:00 GMT

ref:http://blogs.msdn.com/aribeiro/articles/351439.aspx

Rendering n-column tables using the Repeater control

The ASP.NET Repeater control provides a template-based mechanism for rendering data using Data Binding. A basic usage sample can be found here .

The control uses the tag for declaring HTML that should be rendered for each data item and a tag to put some HTML between items. It also supports an that can useful to render a fancy mixed two-color list or, more seriously, a two-column table. An example:

Page1.aspx

<%# DataBinder.Eval(Container.DataItem, "ProductName") %>

Page1.cs

        protected System.Web.UI.WebControls.Repeater Repeater1;

        private void Page_Load(object sender, System.EventArgs e)
        {
            SqlConnection connection = new SqlConnection("Data Source=(local);Initial Catalog=Northwind;Integrated Security=SSPI;");
            SqlCommand command = new SqlCommand("SELECT TOP 15 ProductId, ProductName FROM Products", connection);

            connection.Open();
            Repeater1.DataSource = command.ExecuteReader(CommandBehavior.CloseConnection);
            Repeater1.DataBind();
        }

Resulting HTML

Alice Mutton	Aniseed Syrup
Boston Crab Meat	Camembert Pierrot
Carnarvon Tigers	Chai
Chang	Chartreuse verte
Chef Anton's Cajun Seasoning	Chef Anton's Gumbo Mix
Chocolade	Côte de Blaye
Escargots de Bourgogne	Filo Mix
Flotemysost

But what if need to render, lets say, a 3-column table?

Alice Mutton	Aniseed Syrup	Boston Crab Meat
Camembert Pierrot	Carnarvon Tigers	Chai
Chang	Chartreuse verte	Chef Anton's Cajun Seasoning
Chef Anton's Gumbo Mix	Chocolade	Côte de Blaye
Escargots de Bourgogne	Filo Mix	Flotemysost

And generically, a n-column table?

There's no tag for this purpose. Yes, you could just programatically render the required HTML, loosing the design-time support. But you can also achieve this using a template-based approach maintaining design time support, using Data Binding events. Here's how.

A 3-column table using a template-based Repeater

To produce a 3-column table, all you need is render a ... for each data item, and render a every 3 items. Besides, you should place a befere the first item and a after the last item.

The difficult part on this is the "render a every 3 items" thing. How can this be achieved using Data Binding? The answer is the ItemDataBound event.

When you invoke DataBind() method on a Data Binding enabled control, you can subscribe an event that is fired when each item is rendered. With some coding on this event, you can programmatically change the presentation of a specific data item. With this in mind, you can just count the items being rendered, and show or hide a separator every three items.

A full example:

Page1.aspx

<%# DataBinder.Eval(Container.DataItem, "ProductName") %>

Page1.cs

        protected System.Web.UI.WebControls.Repeater Repeater1;
        protected int counter = 0;
        protected int columnCount = 3;

        private void Page_Load(object sender, System.EventArgs e)
        {
            SqlConnection connection = new SqlConnection("Data Source=(local);Initial Catalog=Northwind;Integrated Security=SSPI;");
            SqlCommand command = new SqlCommand("SELECT TOP 15 ProductId, ProductName FROM Products", connection);

            connection.Open();
           Repeater1.DataSource = command.ExecuteReader(CommandBehavior.CloseConnection);
            Repeater1.ItemDataBound +=new RepeaterItemEventHandler(Repeater1_ItemDataBound);
            Repeater1.DataBind();
        }

        private void Repeater1_ItemDataBound(object sender, RepeaterItemEventArgs e)
        {
            if (e.Item.ItemType == ListItemType.Separator)
                if((++counter % columnCount) != 0)
                    e.Item.Visible = false;
        }

Cool?To get the full source code for this sample e-mail the author aribeiro@microsoft.com

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jQuery Ajax 全解析（转载）

Tony Zhou — Fri, 01 Aug 2008 10:09:00 GMT

摘要: jQuery Ajax 全解析本文地址: jQuery Ajax 全解析本文作者：QLeelulu转载请标明出处！jQuery确实是一个挺好的轻量级的JS框架，能帮助我们快速的开发JS应用，并在一定程度上改变了我们写JavaScript代码的习惯。废话少说，直接进入正题，我们先来看一些简单的方法，这些方法都是对jQuery.ajax()进行封装以方便我们使用的方法，当然，如果要处理复杂的逻辑，阅读全文

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JQuery手册

Tony Zhou — Fri, 01 Aug 2008 07:11:00 GMT

摘要: 翻译整理：Young.J官方网站：http://jquery.com jQuery是一款同prototype一样优秀js开发库类，特别是对css和XPath的支持，使我们写js变得更加方便！如果你不是个js高手又想写出优秀的js效果，jQuery可以帮你达到目的！下载地址：Starterkit （http://jquery.bassistance.de/jquery-starterkit.zi 阅读全文

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AJAX开发

Tony Zhou — Fri, 01 Aug 2008 07:10:00 GMT

摘要: 七、AJAX开发到这里，已经可以清楚的知道AJAX是什么，AJAX能做什么，AJAX什么地方不好。如果你觉得AJAX真的能给你的开发工作带来改进的话，那么继续看看怎么使用AJAX吧。7.1、AJAX应用到的技术AJAX涉及到的7项技术中，个人认为Javascript、XMLHttpRequest、DOM、XML比较有用。A、XMLHttpRequest对象XMLHttpRequest是XMLHTT 阅读全文

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将windows services制作成MSI安装程序

Tony Zhou — Wed, 09 Jul 2008 02:23:00 GMT

1、创建新的“安装项目”项目；
2、在解决方案资源管理器中添加相应的所有项目文件（在项目上右键“添加”—>“文件”）；
3、在解决方案资源管理器上方点击“自定义操作编辑器”；
4、在“自定义操作”视图中，点击“安装”，右击“添加自定义操作”，在弹出窗口“选择项目中的项”中选择对应的windows service所在的EXE文件，点击确定；
5、在“安装”下点击上一步选择的windows service程序文件，在属性窗口中设置参数(Arguments)为 “/install” ；（这一步可让安装程序MSI自动安装好Windows service）
6、同样在“卸装”项中添加windows service所在的EXE文件，并在属性窗口中设置参数(Arguments)为 “/uninstall” ；（这一步可以在“添加/删除程序”时自动卸装Windows service）
7、生成项目文件就OK了。

o build your service project

In Solution Explorer, right-click your project and select Properties from the shortcut menu. The project's Property Pages dialog box appears.
In the left pane, select the General tab in the Common Properties folder.
From the Startup object list, choose MyNewService. Click OK.
Press Ctrl+Shift+B to build the project.

Now that the project is built, it can be deployed. A setup project will install the compiled project files and run the installers needed to run the Windows service. To create a complete setup project, you will need to add the project output, MyNewService.exe, to the setup project and then add a custom action to have MyNewService.exe installed.

To create a setup project for your service

On the File menu, point to Add Project, and then choose New Project.
In the Project Types pane, select the Setup and Deployment Projects folder.
In the Templates pane, select Setup Project. Name the project MyServiceSetup.

A setup project is added to the solution. Next you will add the output from the Windows service project, MyNewService.exe, to the setup.

To add MyNewService.exe to the setup project

In Solution Explorer, right-click MyServiceSetup, point to Add, then choose Project Output. The Add Project Output Group dialog box appears.
MyNewService is selected in the Project box.
From the list box, select Primary Output, and click OK.
A project item for the primary output of MyNewService is added to the setup project. Now add a custom action to install the MyNewService.exe file.

To add a custom action to the setup project

In Solution Explorer, right-click the setup project, point to View, then choose Custom Actions. The Custom Actions editor appears.
In the Custom Actions editor, right-click the Custom Actions node and choose Add Custom Action. The Select Item in Project dialog box appears.
Double-click the application folder in the list box to open it, select primary output from MyNewService (Active), and click OK. The primary output is added to all four nodes of the custom actions — Install, Commit, Rollback, and Uninstall.
Build the setup project.

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生成repeater分页的页码，可以想datagrid一样分页。需要配合PagedDataSource 。

Tony Zhou — Tue, 17 Jun 2008 09:04:00 GMT

生成repeater分页的页码，可以想datagrid一样点击。需要配合PagedDataSource 。

public string CreatePagerLinks(PagedDataSource objPds, string BaseUrl)
  {
   int totalPageRanger = 3;//set page range is 5, means display five hyperlink for page selection
   int pageRanger = (totalPageRanger-1)/2;

StringBuilder sbPager = new StringBuilder();

   if (!objPds.IsFirstPage)
   {
    // first page link
    sbPager.Append("     sbPager.Append(BaseUrl);
    sbPager.Append("\">|< ");
    if (objPds.CurrentPageIndex != 1)
    {
     // previous page link
     sbPager.Append("      sbPager.Append(BaseUrl);
     sbPager.Append("&page=");
     sbPager.Append(objPds.CurrentPageIndex.ToString());
     sbPager.Append("\" alt=\"Previous Page\"><< ");
    }
   }

int intLow = objPds.CurrentPageIndex + 1 - pageRanger;//pageindex + 1 = pagenumber
int intHigh = objPds.CurrentPageIndex + 1 + pageRanger;//pageindex + 1 = pagenumber

if (intLow < 1) intLow = 1;
if (intHigh > objPds.PageCount) intHigh = objPds.PageCount;

   if (intHigh - intLow < totalPageRanger)
   {
    intHigh = intLow + totalPageRanger - 1;
    if (intHigh > objPds.PageCount)
     intHigh = objPds.PageCount;
   }
   if (intHigh - intLow < totalPageRanger)
   {
    intLow = intHigh - totalPageRanger + 1;
    if (intLow < 1)
     intLow = 1;
   }

   for (int x = intLow; x <= intHigh ; x++)
   {
    // numeric links
    if (x == objPds.CurrentPageIndex + 1) sbPager.Append(x.ToString() + " ");
    else
    {
     sbPager.Append("      sbPager.Append(BaseUrl);
     sbPager.Append("&page=");
     sbPager.Append(x.ToString());
     sbPager.Append("\">");
     sbPager.Append(x.ToString());
     sbPager.Append(" " );
    }
   }
   if (!objPds.IsLastPage)
   {
    if ((objPds.CurrentPageIndex + 2) != objPds.PageCount)
    {
     // next page link
     sbPager.Append("      sbPager.Append(BaseUrl);
     sbPager.Append("&page=");
     sbPager.Append(Convert.ToString(objPds.CurrentPageIndex + 2));
     sbPager.Append("\">>> ");
    }
    // last page link
    sbPager.Append("     sbPager.Append(BaseUrl);
    sbPager.Append("&page=");
    sbPager.Append(objPds.PageCount.ToString());
    sbPager.Append("\">>|");
   }
   // conver the final links to a string and assign to labels
   return sbPager.ToString();
  }

lilPage是一个literal，直接调用上面那个方法赋值就可以。

private void BindRepeater()
  {
   DataSet ds = new DataSet();

    ds = ......

   DataTable dt = ds.Tables[0];

   foreach (DataRow dr in dt.Rows)
   {
    if (dr["RewardImageUrl"]==null||dr["RewardImageUrl"].ToString().Length ==0)
     dr["RewardImageUrl"] = ConfigVar.Get("NO_PIC").ToString();
   }

   PagedDataSource pagedDataSource = new PagedDataSource();
   pagedDataSource.DataSource = ds.Tables[0].DefaultView;
   pagedDataSource.AllowPaging = true;
   pagedDataSource.PageSize = int.Parse(giftPageSize);

   //start paging
   if (GetPage() > -1)
   {
    // subtract 1 because the PagedDataSource uses a zero-based index
    int pageIndex = GetPage() - 1 ;
    // correct for a page index less than 0 or greater than the last page
    if (pageIndex < 0) pageIndex = 0;
    if (pageIndex > pagedDataSource.PageCount)
     pageIndex = pagedDataSource.PageCount - 1;
    pagedDataSource.CurrentPageIndex = pageIndex;
   }
   this.RepGiftList.DataSource = pagedDataSource;
   this.RepGiftList.DataBind();

lilPage.Text = CreatePagerLinks(pagedDataSource, GetAbsolutUri());
}

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用httpmodule自动加密解密query string查询字符串

Tony Zhou — Fri, 06 Jun 2008 09:46:00 GMT

项目中经常遇到query string的加密解密问题，如果在页面或者page base里面处理的话总有点不爽。
所以最近尝试着用httpmodule解决。在网上看到了几篇文章，综合了一下，解决了postback加密过的url丢失的问题。
HttpModule:
#region Using

using System;
using System.IO;
using System.Web;
using System.Text;
using System.Security.Cryptography;

#endregion

///

/// Summary description for QueryStringModule
///

public class QueryStringModule : IHttpModule
{

    #region IHttpModule Members

    public void Dispose()
    {
        // Nothing to dispose
    }

    public void Init(HttpApplication context)
    {
        context.BeginRequest += new EventHandler(context_BeginRequest);
    }

    #endregion

    private const string PARAMETER_NAME = "enc=";
    private const string ENCRYPTION_KEY = "key";

    void context_BeginRequest(object sender, EventArgs e)
    {
        HttpContext context = HttpContext.Current;
        if (context.Request.Url.OriginalString.Contains("aspx") && context.Request.RawUrl.Contains("?"))
        {
            string query = ExtractQuery(context.Request.Url.ToString());
            string path = GetVirtualPath();

            if (query.StartsWith(PARAMETER_NAME, StringComparison.OrdinalIgnoreCase))
            {
                // Decrypts the query string and rewrites the path.
                context.Items["OriginalUrl"] = context.Request.Url.ToString();
                string rawQuery = query.Replace(PARAMETER_NAME, string.Empty);
                string decryptedQuery = Decrypt(rawQuery);
                context.RewritePath(path, string.Empty, decryptedQuery);
            }
            else if (context.Request.HttpMethod == "GET")
            {
                // Encrypt the query string and redirects to the encrypted URL.
                // Remove if you don't want all query strings to be encrypted automatically.
                string encryptedQuery = Encrypt(query);
                context.Items["OriginalUrl"] = path + encryptedQuery;
                context.Response.Redirect(path + encryptedQuery);
            }
        }
    }

    ///

/// Parses the current URL and extracts the virtual path without query string.
///

    /// The virtual path of the current URL.
    private static string GetVirtualPath()
    {
        string path = HttpContext.Current.Request.RawUrl;
        path = path.Substring(0, path.IndexOf("?"));
        path = path.Substring(path.LastIndexOf("/") + 1);
        return path;
    }

    ///

/// Parses a URL and returns the query string.
///

    /// The URL to parse.
    /// The query string without the question mark.
    private static string ExtractQuery(string url)
    {
        int index = url.IndexOf("?") + 1;
        return url.Substring(index);
    }

    #region Encryption/decryption

    ///

/// The salt value used to strengthen the encryption.
///

private readonly static byte[] SALT = Encoding.ASCII.GetBytes(ENCRYPTION_KEY.Length.ToString());

///

/// Encrypts any string using the Rijndael algorithm.
///

    /// The string to encrypt.
    /// A Base64 encrypted string.
    public static string Encrypt(string inputText)
    {
        RijndaelManaged rijndaelCipher = new RijndaelManaged();
        byte[] plainText = Encoding.Unicode.GetBytes(inputText);
        PasswordDeriveBytes SecretKey = new PasswordDeriveBytes(ENCRYPTION_KEY, SALT);

        using (ICryptoTransform encryptor = rijndaelCipher.CreateEncryptor(SecretKey.GetBytes(32), SecretKey.GetBytes(16)))
        {
            using (MemoryStream memoryStream = new MemoryStream())
            {
                using (CryptoStream cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write))
                {
                    cryptoStream.Write(plainText, 0, plainText.Length);
                    cryptoStream.FlushFinalBlock();
                    return "?" + PARAMETER_NAME + Convert.ToBase64String(memoryStream.ToArray());
                }
            }
        }
    }

    ///

/// Decrypts a previously encrypted string.
///

    /// The encrypted string to decrypt.
    /// A decrypted string.
    public static string Decrypt(string inputText)
    {
        RijndaelManaged rijndaelCipher = new RijndaelManaged();
        byte[] encryptedData = Convert.FromBase64String(inputText);
        PasswordDeriveBytes secretKey = new PasswordDeriveBytes(ENCRYPTION_KEY, SALT);

        using (ICryptoTransform decryptor = rijndaelCipher.CreateDecryptor(secretKey.GetBytes(32), secretKey.GetBytes(16)))
        {
            using (MemoryStream memoryStream = new MemoryStream(encryptedData))
            {
                using (CryptoStream cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read))
                {
                    byte[] plainText = new byte[encryptedData.Length];
                    int decryptedCount = cryptoStream.Read(plainText, 0, plainText.Length);
                    return Encoding.Unicode.GetString(plainText, 0, decryptedCount);
                }
            }
        }
    }

    #endregion

}

PageBase:需要继承一下这个pagebase
public class PageBase:Page
    {

        protected override void OnLoadComplete(EventArgs e)
        {
            string originalUrl = Context.Items["OriginalUrl"] as string;

            if (!string.IsNullOrEmpty(originalUrl)) //So this page have been urlrewriten, after the page onloaded, rewrite the url of this page to original url
            {
                string query = string.Empty;
                int pos = originalUrl.IndexOf('?');
                if (pos >= 0)// check if has query paramet
                    query = originalUrl.Substring(pos + 1);
                //                    originalUrl = originalUrl.Substring(0, pos);
                Context.RewritePath(QueryStringModule.GetVirtualPath(), string.Empty, query);
            }
            base.OnLoadComplete(e);
        }
    }

参考
http://msdn.microsoft.com/en-us/library/ms972974.aspx
http://www.webpronews.com/expertarticles/2007/01/25/aspnet-httpmodule-for-query-string-encryption

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NETWORK SERVICE错误

Tony Zhou — Sat, 26 Apr 2008 08:12:00 GMT

启动时出现一个矩形框:

“至少一个服务或应用程序错误”

解决的方法：

1. （点击打开）“开始”\“管理工具”\“事件查看器”\（“应用程序”/“安全”/“系统”中寻找并右击错误行）\“事件详细信息——描述”，（如显示：“来源：DCOM 事件：10016 用户：NETWORK SERVICE　应用程序-特定权限设置未将COM 服务器应用程序(CLSID 为{BA126AD1-2166-11D1-B1D0-00805FC1270E})的本地激活权限授予用户 NT AUTHORITY\NETWORK SERVICE SID (S- 1-5-20)。”，则明白这是错误所在）\（点击关闭。）

2. （点击打开）“开始”／“控制面板”／“管理工具”／“组件服务”。

3. 打开树目录“计算机”／“我的电脑”／“DCOM配置”／右击“netman” ／ “属性”／“安全”／“启动和激活权限” ／“自定义”-“编辑”／“添加-‘ NETWORK SERVICE ’” ／“确定”／“‘本地启动-允许’；‘本地激活-允许’” ／“确定”／“应用”／“确定”（完成）。

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Command模式

Tony Zhou — Tue, 25 Mar 2008 07:40:00 GMT

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

public partial class Design_Pattern_Command : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Controller controller = new Controller();

        Hello hello = new Hello();
        HelloCommand helloCommand = new HelloCommand(hello);
        controller.SetCommand(0, helloCommand);

        Bye bye = new Bye();
        ByeCommand byeCommand = new ByeCommand(bye);
        controller.SetCommand(1, byeCommand);

        Good good = new Good();
        GoodCommand goodCommand = new GoodCommand(good);
        controller.SetCommand(2, goodCommand);

        controller.OnPush(2);
        controller.OnPush(0);
        controller.OnPush(1);

    }
}

public class Hello
{
    public void SayHello()
    {
        System.Web.HttpContext.Current.Response.Write("Hello!");
    }
}

public class Bye
{
    public void SayBye()
    {
        System.Web.HttpContext.Current.Response.Write("Bye!");
    }
}

public class Good
{
    public void SayGood()
    {
        System.Web.HttpContext.Current.Response.Write("Good!");
    }
}

public interface ICommand
{
    void Execute();
}

public class HelloCommand : ICommand
{
    private Hello _hello;

    public HelloCommand(Hello hello)
    {
        this._hello = hello;
    }

    public void Execute()
    {
        this._hello.SayHello();
    }
}

public class ByeCommand : ICommand
{
     private Bye _bye;

     public ByeCommand(Bye bye)
     {
        this._bye = bye;
     }

    public void Execute()
    {
        this._bye.SayBye();
    }
}

public class GoodCommand : ICommand
{
    private Good _good;

    public GoodCommand(Good good)
    {
        this._good = good;
    }

    public void Execute()
    {
        this._good.SayGood();
    }
}

public class Controller
{
    ICommand[] commands = new ICommand[3];

    public void SetCommand(int slot, ICommand command)
    {
        commands[slot] = command;
    }

    public void OnPush(int slot)
    {
        commands[slot].Execute();
    }

}

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Decorator模式

Tony Zhou — Mon, 03 Mar 2008 05:46:00 GMT

根据《Head Of Design Pattern》里面的Java代码改写的Decorator模式

public partial class Design_Pattern_Decorator : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Beverage beverage1 = new Espresso();
        beverage1 = new Mocha(beverage1);
        beverage1 = new Sugar(beverage1);
        Response.Write(beverage1.cost());
        Response.Write(beverage1.GetDescription());
    }
}

public abstract class Beverage
{
protected string description = "Unknown Beverage";

    public virtual string GetDescription()
    {
        return description;
    }

public abstract double cost();
}

public class Espresso : Beverage
{
    public Espresso()
    {
        this.description = "Espresso";
    }

    public override double cost()
    {
        return 1.99;
    }
}

public class HouseBlend : Beverage
{
    public HouseBlend()
    {
        this.description = "House Blend";
    }

    public override double cost()
    {
        return 0.89;
    }
}

public abstract class CondimentDecorator : Beverage
{
public override abstract string GetDescription();
}

public class Mocha : CondimentDecorator
{
Beverage beverage;

    public Mocha(Beverage beverage)
    {
        this.beverage = beverage;
    }

    public override string GetDescription()
    {
        this.description = beverage.GetDescription() + ", Mocha";
        return this.description;
    }

    public override double cost()
    {
        return beverage.cost() + 0.2;
    }
}

public class Sugar : CondimentDecorator
{
Beverage beverage;

    public Sugar(Beverage beverage)
    {
        this.beverage = beverage;
    }

    public override string GetDescription()
    {
        return beverage.GetDescription() + ", Sugar";
    }

    public override double cost()
    {
        return beverage.cost() + 0.12;
    }

}

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