Server.Transfer方式(或称HttpContext方式)传值实例

        public   class   QueryPage   :   System.Web.UI.Page
{
protected System.Web.UI.WebControls.TextBox txtStaDate;
protected System.Web.UI.WebControls.TextBox txtEndDate;
...
/// <summary>
/// 开始时间
/// </summary>
public string StaDate
{
get{ return this.txtStaDate.Text;}
set{this.txtStaDate.Text = value;}
}
/// <summary>
/// 结束时间
/// </summary>
public string EndDate
{
get{ return this.txtEndDate.Text;}
set{this.txtEndDate.Text = value;}
}
....
private void btnEnter_Click(object sender, System.EventArgs e)
{
Server.Transfer( "ResultPage.aspx ");
}
} 在显示查询结果页面(ResultPage.aspx):
public class ResultPage : System.Web.UI.Page
{
private void Page_Load(object sender, System.EventArgs e)
{ //转换一下即可获得前一页面中输入的数据
QueryPage queryPage = ( QueryPage )Context.Handler; Response.Write( "StaDate: " );
Response.Write( queryPage.StaDate );
Response.Write( " <br/> EndDate: " );
Response.Write( queryPage.EndDate );
}
} 三、如果有许多查询页面共用一个结果页面的设置方法:
在这种方式中关键在于“ QueryPage queryPage = ( QueryPage )Context.Handler; ”的转换,只有转换不依赖于特定的页面时即可实现。
如果让所有的查询页面都继承一个接口,在该接口中定义一个方法,该方法的唯一作用就是让结果页面获得构建结果时所需的参数,就可实现多页面共享一个结果页面操作! 、先定义一个类,用该类放置所有查询参数:
/// <summary>
/// 结果页面中要用到的值
/// </summary>
public class QueryParams
{
private string staDate;
private string endDate; /// <summary>
/// 开始时间
/// </summary>
public string StaDate
{
get{ return this.staDate;}
set{this.staDate = value;}
}
/// <summary>
/// 结束时间
/// </summary>
public string EndDate
{
get{ return this.endDate;}
set{this.endDate = value;}
}
} 、接口定义:
/// <summary>
/// 定义查询接口。
/// </summary>
public interface IQueryParams
{
/// <summary>
/// 参数
/// </summary>
QueryParams Parameters{get;}
} 、查询页面继承IQueryParams接口(QueryPage.aspx): /// <summary>
///查询页面,继承接口
/// </summary>
public class QueryPage : System.Web.UI.Page, IQueryParams
{
protected System.Web.UI.WebControls.TextBox txtStaDate;
protected System.Web.UI.WebControls.TextBox txtEndDate; private QueryParams queryParams;
...
/// <summary>
/// 结果页面用到的参数
/// </summary>
public QueryParams Parameters
{
get
{
return queryParams;
}
}
....
private void btnEnter_Click(object sender, System.EventArgs e)
{
//赋值
queryParams = new QueryParams();
queryParams.StaDate = this.txtStaDate.Text;
queryParams.EndDate = this.txtEndDate.Text Server.Transfer( "ResultPage.aspx ");
}
}
、别外的页面也如此设置
、接收页面(ResultPage.aspx): public class ResultPage : System.Web.UI.Page
{
private void Page_Load(object sender, System.EventArgs e)
{ QueryParams queryParams = new QueryParams();
IQueryParams queryInterface;
//实现该接口的页面
if( Context.Handler is IQueryParams)
{
queryInterface = ( IQueryParams )Context.Handler;
queryParams = queryInterface.Parameters;
} Response.Write( "StaDate: " );
Response.Write( queryParams.StaDate );
Response.Write( " <br/> EndDate: " );
Response.Write( queryParams.EndDate );
}
}
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