分享一些曾经设计的ASP.NET自定义服务端控件（附源程序下载）

      也算是自己刚毕业时候的作品吧，当时在一家创业公司工作，考虑给公司建立一个公司的控件库，于是也学习过一段时间的控件设计，当时领我入门的是《道不远人》那本控件开发书，觉得谭振宁写的还是相当不错的，推荐一下：）。那么就开始分享我设计的一些控件，并且告诉一些基本的设计思路。

具体实现了这些控件：

CheckTextBox: 可以对于输入TextBox的字符做出判断

HighSlideHyperLink: 点击HyperLink可以弹出相关Div层或者Img图象

ContextMenu: 上下文菜单特效

Menu: 菜单特效

EnablePageDataList: 具有分页功能的DataList

EnablePageRepeater: 具有分页功能的Repeater

GroupDropDownList: 具有分组选项功能的DropDownList

GroupListBox: 具有分组选项功能的ListBox

SearchCloud:Tag云图,可以根据关键词的搜索数量，进行排列

 

1. CheckTextBox

效果图：

 

该控件继承自TextBox控件：

[DefaultProperty("Text")]

[ToolboxData("<{0}:CheckTextBox runat=server>")]

public class CheckTextBox : TextBox

{

...

}

其中 DefaultProperty将Text作为默认属性，代表着在属性窗口中自动被选中的是Text属性； ToolboxData代表你从工具箱拖动控件到设计页面时，会自动在代码中产生该字符串的代码。

 

控件的属性代码：

private TextType _inputType;

[Description(@"文本框输入的类型：

                String------任意文本,

                Upper---------大写,

                Lower---------小写,

                Number--------任意数字,

                FormatNumber--格式化指定的小数,

                Date----------日期,

                ChineseLanguage-中文,

                IP------------IP地址,

                Phone---------固定电话

        ")

]

public TextType InputType

{

    get

    {

        return _inputType;

    }

    set

    {

        if((value < TextType.String) || (value > TextType.Phone))

        {

            throw new ArgumentOutOfRangeException("无效属性值");

        }

        _inputType = value;

    }

}

Description属性将在设计窗口属性中显示出描述：

通过AddAttributesToRender方法实现脚本的注册：

protected override void AddAttributesToRender(HtmlTextWriter writer)

{

...

}

其中InputType包括几种方式以及一些事件发生的脚本：

public static class TextScript

{

    public static string ChineseLanguage = @"/^[\u4E00-\u9FA5]*$/";

    public static string Lower = @"/^[a-z]*$/";

    public static string Number = @"/^[0-9]*$/";

    public static string Phone = @"/^\d{1,4}([-\/](\d{1,8}?)?)?$/";

    public static string IP = @"/^\d{1,3}([.\/](\d{1,3}([.\/](\d{1,3}([.\/](\d{1,3}([.\/](\d{1,3}([.\/](\d{1,3}?)?)?)?)?)?)?)?)?)?)?$/";

    public static string Upper = @"/^[A-Z]*$/";

    public static string OnKeyPress = @"return regInput(this,    {0},String.fromCharCode(event.keyCode))";

    public static string OnPaste = @"return regInput(this,{0},window.clipboardData.getData('Text'))";

    public static string OnDrop = @"return regInput(this,{0},event.dataTransfer.getData('Text'))";

    public static string OnFocusCloseInput = "this.style.imeMode='disabled'";

}

调用服务器控件页面代码：

 

 
   

    
  

    <?xml:namespace prefix = cc1 />
  
    

    
  
    


    
  
    
  
    


    
  
    
  
    


    
  
    
  
    


    
  
    

    
  
    


    
  
    
 
   

 

2. HighSlideHyperLink

效果图：

看到类的头部：

[assembly: WebResource("Conovosoft.Web.UI.WebControls.highslide.css", "text/css")]

[assembly: WebResource("Conovosoft.Web.UI.WebControls.highslide.js", "text/javascript")]

[assembly: WebResource("Conovosoft.Web.UI.WebControls.highslide-html.js", "text/javascript")]

这里控件需要引用一些JS以及CSS的资源文件，highslide作为第三方的JS脚本，为了实现图片放大的效果。

在OnPreRender方法中注册脚本文件：

protected override void OnPreRender(EventArgs e)

{

    RegisterClientCSSResource("Conovosoft.Web.UI.WebControls.highslide.css");

    Page.ClientScript.RegisterClientScriptResource(this.GetType(),

        "Conovosoft.Web.UI.WebControls.highslide.js");

    Page.ClientScript.RegisterClientScriptResource(this.GetType(),

        "Conovosoft.Web.UI.WebControls.highslide-html.js");

    if (!Page.ClientScript.IsStartupScriptRegistered("baseTextScript"))

    {

        if (this.ControlType == InputType.Div)

        {

            if (!string.IsNullOrEmpty(this.DivID))

            {

                this.Page.ClientScript.RegisterStartupScript(this.GetType(), "baseTextScript", @"", false);

            }      

        }

        if (this.ControlType == InputType.Img)

        {

            if (!string.IsNullOrEmpty(this.CaptionID))

            {

                this.Page.ClientScript.RegisterStartupScript(this.GetType(), "baseTextScript", @"", false);

            }

        }

    }

    base.OnPreRender(e);

}

 

调用代码：

<cc1:HighSlideHyperLink NavigateUrl="images/full.jpg" CssClass="highslide" ControlType="img"
ID="HighSlideHyperLink2" runat="server">
<img border="0" src="images/thumb.jpg" />
</cc1:HighSlideHyperLink>

 

 

3. EnablePageRepeater

效果图：

 

控件代码：

using System;

using System.Collections.Generic;

using System.Text;

using System.Web.UI.WebControls;

using System.ComponentModel;

using System.Collections;



namespace Conovosoft.Web.UI.WebControls

{

    public class EnablePageRepeater : Repeater

    {

        private static readonly object EventPageIndexChanged = new object();

        PagedDataSource pagedDataSource;



        [DefaultValue(false), Category("Paging")]

        public virtual bool AllowPaging

        {

            get

            {

                object obj2 = this.ViewState["AllowPaging"];

                if (obj2 != null)

                {

                    return (bool)obj2;

                }

                return false;

            }

            set

            {

                this.ViewState["AllowPaging"] = value;

            }

        }



        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden),

        Browsable(false)]

        public virtual int VirtualItemCount

        {

            get

            {

                object obj2 = this.ViewState["VirtualItemCount"];

                if (obj2 != null)

                {

                    return (int)obj2;

                }

                return 0;

            }

            set

            {

                if (value < 0)

                {

                    throw new ArgumentOutOfRangeException("value");

                }

                this.ViewState["VirtualItemCount"] = value;

            }

        }



        [DefaultValue(10), Category("Paging")]

        public virtual int PageSize

        {

            get

            {

                object obj2 = this.ViewState["PageSize"];

                if (obj2 != null)

                {

                    return (int)obj2;

                }

                return 10;

            }

            set

            {

                if (value < 1)

                {

                    throw new ArgumentOutOfRangeException("value");

                }

                this.ViewState["PageSize"] = value;

            }

        }



        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden),

        Browsable(false)]

        public int PageCount

        {

            get

            {

                if (this.pagedDataSource != null)

                {

                    return this.pagedDataSource.PageCount;

                }

                object obj2 = this.ViewState["PageCount"];

                if (obj2 == null)

                {

                    return 0;

                }

                return (int)obj2;

            }

        }



        [Browsable(false),

       DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]

        public int CurrentPageIndex

        {

            get

            {

                object obj2 = this.ViewState["CurrentPageIndex"];

                if (obj2 != null)

                {

                    return (int)obj2;

                }

                return 0;

            }

            set

            {

                if (value < 0)

                {

                    throw new ArgumentOutOfRangeException("value");

                }

                this.ViewState["CurrentPageIndex"] = value;

                OnPageIndexChanged(new DataGridPageChangedEventArgs(this, value));

            }

        }



        protected virtual void OnPageIndexChanged(DataGridPageChangedEventArgs e)

        {

            DataGridPageChangedEventHandler handler = (DataGridPageChangedEventHandler)Events[EventPageIndexChanged];

            if (handler != null)

                handler(this, e);

        }



        [Category("Action")]

        public event DataGridPageChangedEventHandler PageIndexChanged

        {

            add

            {

                base.Events.AddHandler(EventPageIndexChanged, value);

            }

            remove

            {

                base.Events.RemoveHandler(EventPageIndexChanged, value);

            }

        }



        protected override System.Collections.IEnumerable GetData()

        {

            IEnumerable dataSource = base.GetData();

            if (AllowPaging && dataSource != null)

            {

                pagedDataSource = new PagedDataSource();

                ICollection collection = dataSource as ICollection;

                if (collection != null)

                {

                    pagedDataSource.VirtualCount = collection.Count;

                    VirtualItemCount = pagedDataSource.VirtualCount;



                }

                else if (dataSource is IListSource)

                {

                    pagedDataSource.VirtualCount = (dataSource as IListSource).GetList().Count;

                    VirtualItemCount = pagedDataSource.VirtualCount;

                }

                else if (VirtualItemCount > 0)

                {

                    pagedDataSource.VirtualCount = VirtualItemCount;

                }

                else

                {

                    pagedDataSource = null;

                    return dataSource;

                }

                pagedDataSource.DataSource = dataSource;

                pagedDataSource.CurrentPageIndex = CurrentPageIndex;

                pagedDataSource.PageSize = PageSize;

                pagedDataSource.AllowPaging = true;

                pagedDataSource.AllowCustomPaging = false;

                ViewState["PageCount"] = pagedDataSource.PageCount;

                return pagedDataSource;

            }

            return dataSource;

        }

    }

}

 

实现了带分页的Repeater控件。同理，也可以实现带分页的DataList。

4. GroupDropDownList

效果图：

控件代码：

using System;

using System.Collections.Generic;

using System.Text;



using System.Web.UI.WebControls;

using System.Web.UI;

using System.ComponentModel;

using System.Web;



namespace Conovosoft.Web.UI.WebControls

{

    [ToolboxData("<{0}:GroupDropDownList runat=server>")]

    public class GroupDropDownList : DropDownList

    {

        public GroupDropDownList()

        {

        }



        /// 


        /// 用于添加GroupDropDownList的分组项的ListItem的Value值

        /// 

        [

        Browsable(true),

        Description("用于添加GroupDropDownList的分组项的ListItem的Value值"),

        Category("扩展")

        ]

        public virtual string OptionGroupValue

        {

            get

            {

                string s = (string)ViewState["OptionGroupValue"];



                return (s == null) ? "optgroup" : s;

            }

            set

            {

                ViewState["OptionGroupValue"] = value;

            }

        }



        protected override void RenderContents(HtmlTextWriter writer)

        {

            OptionAndGroupRenderContents(writer);

        }



        /// 


        /// 呈现Option或者OptionGroup

        /// 

        /// 

        private void OptionAndGroupRenderContents(HtmlTextWriter writer)

        {

            // 是否需要呈现OptionGroup的EndTag

            bool writerEndTag = false;



            foreach (ListItem li in this.Items)

            {

                // 如果没有optgroup属性则呈现Option

                if (li.Value != this.OptionGroupValue)

                {

                    // 呈现Option

                    RenderListItem(li, writer);

                }

                // 如果有optgroup属性则呈现OptionGroup

                else

                {

                    if (writerEndTag)

                        // 呈现OptionGroup的EndTag

                        OptionGroupEndTag(writer);

                    else

                        writerEndTag = true;



                    // 呈现OptionGroup的BeginTag

                    OptionGroupBeginTag(li, writer);

                }

            }



            if (writerEndTag)

                // 呈现OptionGroup的EndTag

                OptionGroupEndTag(writer);

        }



        /// 


        /// 呈现Option

        /// 

        /// 

        /// 

        private void RenderListItem(ListItem li, HtmlTextWriter writer)

        {

            writer.WriteBeginTag("option");



            // 写入Option的Value

            writer.WriteAttribute("value", li.Value);



            if (li.Selected)

            {

                // 如果该Option被选中则写入selected

                writer.WriteAttribute("selected", "selected");

            }



            foreach (string key in li.Attributes.Keys)

            {

                // 写入Option的其它属性

                writer.WriteAttribute(key, li.Attributes[key]);

            }



            writer.Write(HtmlTextWriter.TagRightChar);



            // 写入Option的Text

            HttpUtility.HtmlEncode(li.Text, writer);



            writer.WriteEndTag("option");

            writer.WriteLine();

        }



        /// 


        /// 呈现OptionGroup的BeginTag

        /// 

        /// 

        /// 

        private void OptionGroupBeginTag(ListItem li, HtmlTextWriter writer)

        {

            writer.WriteBeginTag("optgroup");



            // 写入OptionGroup的label

            writer.WriteAttribute("label", li.Text);



            foreach (string key in li.Attributes.Keys)

            {

                // 写入OptionGroup的其它属性

                writer.WriteAttribute(key, li.Attributes[key]);

            }



            writer.Write(HtmlTextWriter.TagRightChar);

            writer.WriteLine();

        }



        /// 


        /// 呈现OptionGroup的EndTag

        /// 

        /// 

        private void OptionGroupEndTag(HtmlTextWriter writer)

        {

            writer.WriteEndTag("optgroup");

            writer.WriteLine();

        }

    }

}

注意到RenderContents方法调用了OptionAndGroupRenderContents，通过该方法的逻辑实现Option以及OptionGroup的呈现。

调用代码：

<cc1:GroupDropDownList ID="GroupDropDownList1" runat="server">
</cc1:GroupDropDownList>

后台绑定数据代码：

private void BindGroupDropDownList()

{

    //当ListItem的Value值为optgroup时，默认为分组选项



    ListItem li = new ListItem("研发中心", "optgroup");

    GroupDropDownList1.Items.Add(li);



    li = new ListItem("张三", "1");

    GroupDropDownList1.Items.Add(li);



    li = new ListItem("李四", "2");

    GroupDropDownList1.Items.Add(li);





    li = new ListItem("销售中心", "optgroup");

    GroupDropDownList1.Items.Add(li);



    li = new ListItem("王五", "3");

    GroupDropDownList1.Items.Add(li);



    li = new ListItem("李平", "4");

    GroupDropDownList1.Items.Add(li);



}

protected void Button1_Click(object sender, EventArgs e)

{

    Page.ClientScript.RegisterClientScriptBlock(Page.GetType(),"Message", string.Format("alert('Text：{0}，Value：{1}')", this.GroupDropDownList1.SelectedItem.Text, this.GroupDropDownList1.SelectedValue), true);

}

同样GroupListBox实现代码和GroupDropDownList.cs类似。

 

5. SearchCloud标签云

效果图：

控件代码：

using System;

using System.Collections.Generic;

using System.Text;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.ComponentModel;

using System.Data;

using System.Collections;

using System.Text.RegularExpressions;



namespace Conovosoft.Web.UI.WebControls

{

    [ToolboxData("<{0}:SearchCloud runat=server>")]

    public class SearchCloud : WebControl

    {

        #region "属性"



        #region "Appearance"



        [Bindable(true), Category("Appearance"), Localizable(true)]

        public int MinFontSize

        {

            get

            {

                string s = (string)ViewState["MinFontSize"];

                if (String.IsNullOrEmpty(s))

                    return 10;

                else

                {

                    int result = 10;

                    int.TryParse(s, out result);

                    return result;

                }

            }

            set

            {

                ViewState["MinFontSize"] = value;

            }

        }



        [Bindable(true), Category("Appearance"), Localizable(true)]

        public int MaxFontSize

        {

            get

            {

                string s = (string)ViewState["MaxFontSize"];

                if (String.IsNullOrEmpty(s))

                    return 22;

                else

                {

                    int result = 22;

                    int.TryParse(s, out result);

                    return result;

                }

            }

            set

            {

                ViewState["MaxFontSize"] = value;

            }

        }



        [Bindable(true), Category("Appearance"), Localizable(true)]

        public string FontUint

        {

            get

            {

                string s = (string)ViewState["FontUint"];

                if (String.IsNullOrEmpty(s))

                    return "pt";

                else

                    return s;

            }

            set

            {

                switch (value)

                {

                    case "pt":

                    case "em":

                    case "%":

                    case "px":

                        ViewState["FontUnit"] = value; break;

                    default:

                        ViewState["FontUnit"] = "px"; break;

                }

            }

        }



        [Bindable(true), Category("Appearance"), Localizable(true)]

        public string MaxColor

        {

            get

            {

                string s = (string)ViewState["MaxColor"];



                if (String.IsNullOrEmpty(s))

                    return "#00f";

                else

                    return s;

            }

            set

            {

                ViewState["MaxColor"] = value;

            }

        }



        [Bindable(true), Category("Appearance"), Localizable(true)]

        public string MinColor

        {

            get

            {

                string s = (string)ViewState["MinColor"];



                if (String.IsNullOrEmpty(s))

                    return "#000";

                else

                    return s;

            }

            set

            {

                ViewState["MinColor"] = value;

            }

        }



        #endregion



        #region "Data"



        [Bindable(true), Category("Data"), DefaultValue("")]

        public DataSet DataSource

        {

            get

            {

                return (DataSet)ViewState["DataSource"];

            }

            set

            {

                ViewState["DataSource"] = value;

            }

        }



        [Bindable(true), Category("Data"), DefaultValue(""), Localizable(true)]

        public string DataIDField

        {

            get

            {

                return (string)ViewState["DataIDField"];

            }

            set

            {

                ViewState["DataIDField"] = value;

            }

        }



        [Bindable(true), Category("Data"), DefaultValue(""), Localizable(true)]

        public string DataKeywordField

        {

            get

            {

                return (string)ViewState["DataKeywordField"];

            }

            set

            {

                ViewState["DataKeywordField"] = value;

            }

        }



        [Bindable(true), Category("Data"), DefaultValue(""), Localizable(true)]

        public string DataURLField

        {

            get

            {

                return (string)ViewState["DataURLField"];

            }

            set

            {

                ViewState["DataURLField"] = value;

            }

        }



        [Bindable(true), Category("Data"), DefaultValue(""), Localizable(true)]

        public string DataCountField

        {

            get

            {

                return (string)ViewState["DataCountField"];

            }

            set

            {

                ViewState["DataCountField"] = value;

            }

        }



        [Bindable(true), Category("Data"), Localizable(true)]

        public string KeywordTitleFormat

        {

            get

            {

                string s = (string)ViewState["KeywordTitleFormat"];

                if (String.IsNullOrEmpty(s))

                {

                    return "%k occured %c times";

                }

                else

                {

                    return (string)ViewState["KeywordTitleFormat"];

                }

            }

            set

            {

                ViewState["KeywordTitleFormat"] = value;

            }

        }



        [Bindable(true), Category("Data"), Localizable(true)]

        public string KeywordURLFormat

        {

            get

            {

                return (string)ViewState["KeywordURLFormat"];

            }

            set

            {

                ViewState["KeywordURLFormat"] = value;

            }

        }



        [Bindable(true), Category("Data"), DefaultValue(""), Localizable(true)]

        public string SortBy

        {

            get

            {

                return (string)ViewState["SortBy"];

            }

            set

            {

                ViewState["SortBy"] = value;

            }

        }



        #endregion



        [Bindable(false), Category("Debug"), DefaultValue(false), Localizable(true)]

        public Boolean Debug

        {

            get

            {

                if (ViewState["Debug"] != null)

                {

                    return (Boolean)ViewState["Debug"];

                }

                else

                {

                    return false;

                }

  

            }

            set

            {

                ViewState["Debug"] = value;

            }

        }



        #region Private Properties



        private Hashtable arrAttributes;



        private string CloudHTML

        {

            get

            {

                string s = (string)ViewState["CloudHTML"];

                if (String.IsNullOrEmpty(s))

                {

                    return string.Empty;

                }

                return s;

            }

            set

            {

                ViewState["CloudHTML"] = value;

            }

        }



        private Hashtable KeyAttributes

        {

            get

            {

                return arrAttributes;

            }

            set

            {

                arrAttributes = value;

            }

        }



        #endregion



        #endregion



        protected override void Render(HtmlTextWriter writer)

        {

            if (!String.IsNullOrEmpty(CloudHTML))

            {

                writer.WriteBeginTag("div");



                if (!String.IsNullOrEmpty(CssClass))

                {

                    writer.WriteAttribute("class", CssClass);

                }

                writer.Write(HtmlTextWriter.TagRightChar);

                writer.Write(CloudHTML);

                writer.WriteEndTag("div");

            }

            else

            {

                writer.Write("这儿没有产生HTML,一个未操作错误发生.");

            }

        }



        protected override void OnLoad(EventArgs e)

        {

            if (DataSource == null)

            {

                CloudHTML = "请指定DataSet";

                return;

            }

            if (DataIDField == string.Empty)

            {

                CloudHTML = "请指定一个ID数据段";

                return;

            }

            if (DataKeywordField == string.Empty)

            {

                CloudHTML = "请指定一个关键词数据段";

                return;

            }

            if (DataCountField == string.Empty)

            {

                CloudHTML = "请指定一个关键词数量数据段";

                return;

            }

            if (!Regex.IsMatch(MinColor, "^#([a-f]|[A-F]|[0-9]){3}(([a-f]|[A-F]|[0-9]){3})?$"))

            {

                CloudHTML = "最小颜色必须为十六进制编码并且必须为如: #000 or #ff99cc";

                return;

            }

            if (!Regex.IsMatch(MaxColor, "^#([a-f]|[A-F]|[0-9]){3}(([a-f]|[A-F]|[0-9]){3})?$"))

            {

                CloudHTML = "最小颜色必须为十六进制编码并且必须为如: #000 or #ff99cc";

                return;

            }



            try

            {

                StringBuilder sb = new StringBuilder();

                DataView dv = new DataView(DataSource.Tables[0]);

                //DataRowView row;



                dv.Sort = string.Format("{0} DESC", DataCountField);



                int count = dv.Count;



                if (count == 0)

                {

                    CloudHTML = "没有任何值产生云";

                    return;

                }



                int MaxQty = int.Parse(dv[0].Row[DataCountField].ToString());

                int MinQty = int.Parse(dv[dv.Count - 1].Row[DataCountField].ToString());



                int Spread = MaxQty - MinQty;



                if (Spread == 0)

                    Spread = 1;



                int FontSpread = MaxFontSize - MinFontSize;

                if (FontSpread == 0)

                    FontSpread = 1;



                double FontStep = (double)(FontSpread) / Spread;



                if (!string.IsNullOrEmpty(SortBy))

                {

                    dv.Sort = SortBy;

                }

                else

                {

                    dv.Sort = string.Format("{0} ASC", DataKeywordField);

                }



                foreach (DataRowView row in dv)

                {

                    int sKeyID = int.Parse(row.Row[DataIDField].ToString());

                    string sKeyWord = row.Row[DataKeywordField].ToString();

                    int sKeyCount = int.Parse(row.Row[DataCountField].ToString());

                    string sKeyURL;

                    string ColorRGB;

                    double Weight = MinFontSize + ((sKeyCount - MinQty) * FontStep);

                    int FontDiff = MaxFontSize - MinFontSize;

                    double ColorWeight = Math.Round(99 * (Weight - MinFontSize) / (FontDiff) + 1);



                    if (MinColor == MaxColor)

                    {

                        ColorRGB = MinColor;

                    }

                    else

                    {

                        ColorRGB = Colorize(MinColor, MaxColor, ColorWeight);

                    }



                    if (String.IsNullOrEmpty(DataURLField))

                    {

                        if (!String.IsNullOrEmpty(KeywordURLFormat))

                        {

                            sKeyURL = ReplaceKeyValues(KeywordURLFormat, sKeyID, sKeyWord, "", sKeyCount);

                        }

                        else

                        {

                            sKeyURL = "#";

                        }

                    }

                    else

                    {

                        sKeyURL = row[DataURLField].ToString();

                    }

                    sb.Append(string.Format("{3} ",

                        sKeyURL,

                        Math.Round(Weight),

                        ReplaceKeyValues(KeywordTitleFormat, sKeyID, sKeyWord, sKeyURL, sKeyCount),

                        HttpContext.Current.Server.HtmlEncode(sKeyWord),

                        ColorRGB,

                        FontUint,

                        GenerateAttributes(sKeyWord, sKeyID, sKeyURL, sKeyCount)));

                }

                CloudHTML = sb.ToString();

            }

            catch (Exception ex)

            {

                if (!Debug)

                {

                    CloudHTML = "错误产生";

                }

                else

                {

                    throw ex;

                }

            }

            finally

            {

                base.OnLoad(e);

            }

        }



        public void AddAttribute(string value, string text)

        {

            if (KeyAttributes == null)

            {

                KeyAttributes = new Hashtable();

            }

            KeyAttributes.Add(value, text);

        }



        private string GenerateAttributes(string k, int id, string u, int c)

        {

            if (KeyAttributes == null)

            {

                return string.Empty;

            }



            StringBuilder s = new StringBuilder();

            ICollection keys = KeyAttributes.Keys;



            foreach (object key in keys)

            {

                s.Append(string.Format(" {0}=\"{1}\"", key, ReplaceKeyValues(KeyAttributes[key].ToString(), id, k, u, c)));

            }



            return s.ToString();

        }



        private string ReplaceKeyValues(string txt, int id, string k, string u, int c)

        {

            k = k.Replace("'", "'");



            txt = txt.Replace("%i", id.ToString());

            txt = txt.Replace("%k", HttpContext.Current.Server.HtmlEncode(k));

            txt = txt.Replace("%u", u);

            txt = txt.Replace("%c", c.ToString());



            return txt;

        }



        private string Colorize(string minc, string maxc, double w)

        {

            w = w / 100;

            string rs, gs, bs;

            string r, g, b;

            int minr, ming, minb, maxr, maxg, maxb;



            if (minc.Length == 4)

            {

                rs = minc.Substring(1, 1);

                gs = minc.Substring(2, 1);

                bs = minc.Substring(3, 1);



                minc = "#" + rs + rs + gs + gs + bs + bs;

            }



            if (maxc.Length == 4)

            {

                rs = maxc.Substring(1, 1);

                gs = maxc.Substring(2, 1);

                bs = maxc.Substring(3, 1);



                maxc = "#" + rs + rs + gs + gs + bs + bs;

            }



            minr = Convert.ToInt32(minc.Substring(1, 2), 16);

            ming = Convert.ToInt32(minc.Substring(3, 2), 16);

            minb = Convert.ToInt32(minc.Substring(5, 2), 16);



            maxr = Convert.ToInt32(maxc.Substring(1, 2), 16);

            maxg = Convert.ToInt32(maxc.Substring(3, 2), 16);

            maxb = Convert.ToInt32(maxc.Substring(5, 2), 16);



            r = Convert.ToString(int.Parse(Math.Round(((maxr - minr) * w) + minr).ToString()), 16);

            g = Convert.ToString(int.Parse(Math.Round(((maxg - ming) * w) + ming).ToString()), 16);

            b = Convert.ToString(int.Parse(Math.Round(((maxb - minb) * w) + minb).ToString()), 16);



            if (r.Length == 1)

                r = "0" + r;

            if (g.Length == 1)

                g = "0" + g;

            if (b.Length == 1)

                b = "0" + b;



            string color;

            color = "#" + r + g + b;



            return color;

        }

    }

}

调用代码：

<cc1:SearchCloud ID="SearchCloud1" runat="server" />

后台绑定数据代码：

protected void Page_Load(object sender, EventArgs e)

{

    SqlConnection sqlcn = new SqlConnection(@"server=.\SQL2000;uid=sa;pwd=sa;database=Northwind;");

    DataSet ds = new DataSet();

    string sql = "select b.keyword_id,b.keyword_value,b.keyword_count from Products a, ";

    sql += "(select top 10 [Products].ProductID as keyword_id, ProductName as keyword_value, ";

    sql += "count([Order Details].ProductID) as keyword_count ";

    sql += "from [Order Details],[Products] ";

    sql += "where [Order Details].ProductID = [Products].ProductID ";

    sql += "group by [Products].ProductID,ProductName order by keyword_count desc) as b ";

    sql += "where a.ProductID = b.keyword_id ";

    sql += "order by newid()";

    SqlDataAdapter da = new SqlDataAdapter(sql, sqlcn);

    da.Fill(ds);



    SearchCloud1.DataIDField = "keyword_id";

    SearchCloud1.DataKeywordField = "keyword_value";

    SearchCloud1.DataCountField = "keyword_count";

    SearchCloud1.DataSource = ds;

}

这样就实现了类似博客系统中的标签云。

 

最后附上我的源代码：WebControl.UI.rar，希望能够给大家带来些ASP.NET服务器控件开发上的帮助！