DevExpress DXperience 的ASPxFilterControl 组件使用 Linq 模糊查找 Oracle 字符字段不区分大小写终极解决方案
DevExpress 的demo都是用Access及SQL Server做数据库示例，查找字符串都是不区分大小写，但改为用Linq + Oracle后，用户的不区分大小写的模糊匹配查找习惯就跟难满足。Baidu,Google搜索不到答案，DevExpress.com也没相关Q&A，于是琢磨了多天，终于想出完美方案，示例如下：
新建一个WebForm,名称为User.aspx，在窗体中添加一个ASPxFilterControl组件，一个Button及一个GridView
在 Page_Load中加入筛选条件字段，按钮加上筛选事件
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="User.aspx.cs" Inherits="User" %> <%@ Register assembly="DevExpress.Web.v13.1, Version=13.1.8.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" namespace="DevExpress.Web.ASPxEditors" tagprefix="dx" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title></title> </head> <body> <form id="form1" runat="server"> <div> </div> <dx:ASPxFilterControl ID="ASPxFilterControl1" runat="server"> </dx:ASPxFilterControl> <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Filter" /> <br /> <asp:GridView ID="GridView1" runat="server"> </asp:GridView> </form> </body> </html>
1 using System; 2 using System.Diagnostics; 3 using System.Linq; 4 using System.Web.Configuration; 5 using DevExpress.Data.Filtering; 6 using DevExpress.Web.ASPxEditors; 7 using DevExpressEx.Data.Linq.Helpers; 8 using Model; 9 10 public partial class User : System.Web.UI.Page 11 { 12 public Model1Container db = new Model1Container(WebConfigurationManager.ConnectionStrings["OrclConnString"].ToString()); 13 14 protected void Page_Load(object sender, EventArgs e) 15 { 16 if (!IsPostBack) 17 { 18 FilterControlColumn fcc = new FilterControlTextColumn(); 19 fcc.PropertyName = "USER_ID"; 20 fcc.DisplayName = "UserID"; 21 ASPxFilterControl1.Columns.Add(fcc); 22 23 FilterControlColumn fcc2 = new FilterControlTextColumn(); 24 fcc2.PropertyName = "EMAIL"; 25 fcc2.DisplayName = "Email"; 26 ASPxFilterControl1.Columns.Add(fcc2); 27 } 28 29 } 30 protected void Button1_Click(object sender, EventArgs e) 31 { 32 BindData(); 33 } 34 35 public void BindData() 36 { 37 CriteriaOperator coFilter = CriteriaOperator.Parse(ASPxFilterControl1.FilterExpression); 38 39 IQueryable iqQuery = (from u in db.USER_INFO orderby u.USER_ID 40 select new 41 { 42 u.USER_ID, 43 u.EMAIL, 44 }).Where(coFilter).Take(10); 45 46 string sSQL = (iqQuery as System.Data.Objects.ObjectQuery).ToTraceString(); 47 Debug.WriteLine(sSQL); 48 49 GridView1.DataSource = iqQuery; 50 GridView1.DataBind(); 51 } 52 53 }
现在执行程序，查找Email中含有test的用户，全大写，全小写，大小写混合的相关记录都显示。测试成功。
通过
string sSQL = (iqQuery as System.Data.Objects.ObjectQuery).ToTraceString();
Debug.WriteLine(sSQL);
代码可查看到生成的Oracle 语句已含有区分大小写
SELECT * FROM ( SELECT "Project1"."C1" AS "C1", "Project1"."USER_ID" AS "USER_ID", "Project1"."EMAIL" AS "EMAIL" FROM ( SELECT "Extent1"."USER_ID" AS "USER_ID", "Extent1"."EMAIL" AS "EMAIL", 1 AS "C1" FROM "XIMEI"."USER_INFO" "Extent1" WHERE (LOWER("Extent1"."EMAIL") LIKE '%test%') ) "Project1" ORDER BY "Project1"."USER_ID" ASC ) WHERE (ROWNUM <= (10) )
关于 using DevExpressEx.Data.Linq.Helpers; 有兴趣的朋友可到csdn.net 下载
关于ASPxGridView 组件使用 Linq 模糊查找 Oracle 字符字段不区分大小写解决方案，我会尽快抽空完成
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