摘要：
今天看到TerryLee的一篇文章http://www.cnblogs.com/Terrylee/archive/2008/02/20/1075764.html，其中有一条ASP.NET Tag/Search Cloud Server Control（导读：在Web2.0时代，Tag成为了一个标志，通常一些网站都会采用Tag云图来显示。有“好事者”干脆开发了一个Tag云的ASP.NET服务器控件），里边的源文件是用vb写的，我就把代码改改，转换成C#的了，代码我直接贴出来吧，大家自己看吧！一个“好演员”简单地开发了一个用于标记云NET服务器控件的ASP）。里面的源文件是用vb编写的。我将更改代码并将其转换为C#。我将直接粘贴代码。让我们自己看看吧！
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></{0}:SearchCloud>")] public class SearchCloud : WebControl
{ "属性"#region "属性" "Appearance"#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 "Data"#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; } } Private Properties#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("<a href=\"{0}\" style=\"font-size:{1}{5};color:{4};\" title=\"{2}\"{6}>{3}</a> ", 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; } }
}