在Asp.net网页中使用接口
在开发Asp.net时,我们会经常有应用MasterPage或是WebUserControl。这样会遇上一个问题,需要在aspx去找MasterPage或是WebUserControl内的对象,或是从aspx传值给它们。比如一个WebUserControl被aspx调用之后,它产生的ID会随着aspx的环境而变化,而不是一成不变的,因为假如使用FindControl()寻找的话,当ID发生变化,在aspx 运行时会发生异常。下面就以一个WebUserControl来演示。
这个WebUserControl会放一个CheckBoxList控件,当这个WebUserControl拉到aspx页面去时,在asps.cs给这个WebUserControl内的CheckBoxList控件绑定数据源。
写一个接口类别IGetable:
IGetable
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI.WebControls;
/// <summary>
/// Summary description for IGetable
/// </summary>
namespace Insus.NET
{
public interface IGetable
{
CheckBoxList GetControl();
}
}
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI.WebControls;
/// <summary>
/// Summary description for IGetable
/// </summary>
namespace Insus.NET
{
public interface IGetable
{
CheckBoxList GetControl();
}
}
WebUserControl实作上面这个接口:
InsusUc
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Insus.NET;
public partial class InsusUc : System.Web.UI.UserControl,IGetable
{
protected void Page_Load(object sender, EventArgs e)
{
}
public CheckBoxList GetControl()
{
return this.CheckBoxList1;
}
}
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Insus.NET;
public partial class InsusUc : System.Web.UI.UserControl,IGetable
{
protected void Page_Load(object sender, EventArgs e)
{
}
public CheckBoxList GetControl()
{
return this.CheckBoxList1;
}
}
最后是页面aspx.cs为WebUserControl的CheckBoxList控件赋值:
View Code
private void Data_Binding()
{
CheckBoxList cbl = ((IGetable)this.InsusUc1).GetControl();
cbl.DataSource = ProductCode;
cbl.DataTextField = "value";
cbl.DataValueField = "key";
cbl.DataBind();
}
{
CheckBoxList cbl = ((IGetable)this.InsusUc1).GetControl();
cbl.DataSource = ProductCode;
cbl.DataTextField = "value";
cbl.DataValueField = "key";
cbl.DataBind();
}
程序运行时的效果:
源程序下载:
地址:http://download.cnblogs.com/insus/ASPDOTNET/InterfaceDemo.rar