如何在Web网站实现搜索功能

以前曾在一些论坛上帖在搜索功能，不过还是有网友对Insus.NET说起不太会用。另外随着时间的推移，Insus.NET再把Search Utility再重构一下，希望用户能更方便容易应用。重构过的Utility，可以从下面这里下载：http://www.cnblogs.com/insus/articles/1999759.html  下载并解压，把InsusSearchUtility.dll文件放入bin目录即可。

把用户搜索字段与值，组成表过式，下面Insus.NET列出一些较常用的表达式：

InsusSearchUtility objIsu = new InsusSearchUtility();

        string key;
        string value;
        string condition;

        //搜索数据库表的字段
        key = "[MemberName]";
        // 取TextBox的值
        value = this.TextBox1.Text.Trim();  
        //值表过式
        condition = string.Format(" LIKE '%{0}%'", value);
        //存入对象中
        InsusSearchObject sioScrapNumber = new InsusSearchObject(key, value, condition);
        //InsusSearchUtility添加一个对象
        objIsu.Add(sioScrapNumber);

        
        //DropDownList下拉式选择
        if (ddlUnitMeasure.SelectedItem.Value != null)
        {
            key = "[TitleId]";
            value = this.ddlTitle.SelectedItem.Value;
            condition = string.Format(" = '{0}'", value);
            InsusSearchObject sioTitle = new InsusSearchObject(key, value, condition);
            objIsu.Add(sioTitle);
        }

       //日期搜索
        key = "[Birday]";
        //下面这个InsusDateTimeUtility可以从这里下载;http://www.cnblogs.com/insus/articles/1735126.html
        //可以某一天，输入同一天，也可以是一段日期，两个参数，开始日期与结束日期
        value = objInsusDateTimeUtility.GetDateTime(this.DateSelector1.StartDate.Text.Trim(), this.DateSelector1.EndDate.Text.Trim());
        //注意一下这个表达式,没有使用谓词，因为上面这个类别已经带出BETWEEN ... AND ...了。
        condition = string.Format(" {0}", value);
        InsusSearchObject sioBirday = new InsusSearchObject(key, value, condition);
        objIsu.Add(sioBirday);


        //多选,如CheckBox
        key = "[ClassId]";
        value = GetCheckBoxSelectedValue(dlAccuracyClass, "CheckBox1");
        //搜索整形，注意一下表达式,使用IN谓词, 如"1,5,9,3,2"
        condition = string.Format(" IN ({0})", value.Replace("''", "'"));
        InsusSearchObject sioClass = new InsusSearchObject(key, value, condition);
        objIsu.Add(sioClass);


        //多选,如CheckBoxList
        key = "[ComputerName]";       
        value = GetCheckBoxListSelectedValue(this.cblCS);
        //搜索字符串，如"hp,lo,yf,wr"
        condition = string.Format(" IN ('{0}')", value.Replace(",", "','"));
        InsusSearchObject sioComputerName = new InsusSearchObject(key, value, condition);
        objIsu.Add(sioComputerName);       

这个类别，它还有一个函数.SearchCondition()，它会把传入的对象组成一句表达式，即是搜索WHERE的条件语句部分。

objIsu.SearchCondition(objIsu);

执行结果：