[Umbraco] Data Type的扩展编程

继续从上面的Data Types的自定义控件说起。前面用到了自定义控件的数据绑定，虽然这使得我们可以调用外部数据了，但这似乎还比较死板，如果再调用其他数据，还得再创建一个控件，那样的话就会出现类似的功能性控件，复用率不高，而且维护起来也不方便，其实有更好的方法实现，

看下面的代码

.ascx file:

<%@ Control Language="C#" AutoEventWireup="true"     CodeBehind="Demo.ascx.cs"     Inherits="UmbracoCreateCustomDatatypeWithWrapper.Demo" %>

<asp:DropDownList ID="control" runat="server"> </asp:DropDownList>

.ascx.cs file (code behind)

 using System;
 using System.Data;
 using System.Web;
 using System.Web.UI.WebControls;
 using umbraco.cms.businesslogic.datatype;
 using umbraco.editorControls.userControlGrapper;
 using Microsoft.ApplicationBlocks.Data; 

 namespace UmbracoCreateCustomDatatypeWithWrapper
 {
     public class Demo :  UserControl,  IUsercontrolDataEditor
     {
         [DataEditorSetting("Connection string")]
         public string ConnectionString { get; set; }

         [DataEditorSetting("Select statement")]
         public string SelectStatement { get; set; }

         [DataEditorSetting("Text column")]
         public string TextColumn { get; set; }

         [DataEditorSetting("Value column")]
         public string ValueColumn { get; set; }

         public string umbracoValue;

         protected void Page_Load(object sender, EventArgs e)
         {
             if (Page.IsPostBack)
             {
                 //onsave
                 value = control.SelectedValue;
             }
             else
             {
                 control.DataSource = SqlHelper.ExecuteReader(
                     ConnectionString,
                     CommandType.Text,
                     SelectStatement);
                 control.DataTextField = TextColumn;
                 control.DataValueField = ValueColumn;
                 control.DataBind();
                 control.Items.Insert(, new ListItem(String.Empty, String.Empty));

                 control.SelectedIndex = ;
                 if (value != null)
                     control.SelectedValue = value.ToString();
             }
         }

         public object value
         {
             get
             {
                 return umbracoValue;
             }
             set
             {
                 umbracoValue = value.ToString();
             }
         }
     }
 }

如下使用

显示效果

这样是不是更好一点呢。