如何在页面基类中执行Page_Load()？

Question

我有以下 PerformanceFactsheet.aspx.cs 页面类

public partial class PerformanceFactsheet : FactsheetBase
{
    protected void Page_Load(object sender, EventArgs e)
    {
        // do stuff with the data extracted in FactsheetBase
        divPerformance.Controls.Add(this.Data);
    }
}

，其中 FactsheetBase 定义为

public class FactsheetBase : System.Web.UI.Page
{
    public MyPageData Data { get; set; } 
    protected void Page_Load(object sender, EventArgs e)
    {
        // get data that's common to all implementors of FactsheetBase
        // and store the values in FactsheetBase's properties
        this.Data = ExtractPageData(Request.QueryString["data"]);            
    }
}

问题是 FactsheetBase 的 Page_Load 未执行。

谁能告诉我我做错了什么？有没有更好的方法来获得我想要的结果？

谢谢

Answer 1

嗯，我可能错了，但我相信这是由于继承造成的：您正在重写派生类中的 FactsheetBase Page_Load 方法。

为了让它执行，你应该做一些类似的事情

public partial class PerformanceFactsheet : FactsheetBase
{
    protected void Page_Load(object sender, EventArgs e)
    {
        base.Page_Load( sender, e );
        // do stuff with the data extracted in FactsheetBase
        divPerformance.Controls.Add(this.Data);
    }
}

编辑：n8wrl 肯定给了你一个更干净的解决方案（我不是 ASPX 程序员）。

Answer 2

试试这个

 public partial class PerformanceFactsheet : FactsheetBase
{
    public PerformanceFactsheet()
    {
        this.Load += new EventHandler(this.Page_Load);
    }

    protected void Page_Load(object sender, EventArgs e)
    {            
        divPerformance.Controls.Add(this.Data);
    }
}

public abstract class FactsheetBase : System.Web.UI.Page
{
    public MyPageData Data { get; set; }
    public FactsheetBase()
    {
        this.Load += new EventHandler(this.Page_Load);
    }

    new protected void Page_Load(object sender, EventArgs e)
    {            
        this.Data = ExtractPageData(Request.QueryString["data"]);
    }
}

Answer 3

试试这个：

     public partial class PerformanceFactsheet : FactsheetBase
{
    protected override void Page_Load(object sender, EventArgs e)
    {
base.Page_Load(sender, e);
        // do stuff with the data extracted in FactsheetBase
        divPerformance.Controls.Add(this.Data);
    }
}

public class FactsheetBase : System.Web.UI.Page
{
    public MyPageData Data { get; set; } 
    protected virtual void Page_Load(object sender, EventArgs e)
    {
        // get data that's common to all implementors of FactsheetBase
        // and store the values in FactsheetBase's properties
        this.Data = ExtractPageData(Request.QueryString["data"]);            
    }
}

Answer 4

使页面加载公开，并从其他页面以如下方式调用它：

this.myPageOrUserControl.Page_Load(null, EventArgs.Empty);

Answer 5

我们遇到了类似的问题，您所需要做的就是在构造函数中注册处理程序。 :)

public class FactsheetBase : System.Web.UI.Page 
{ 

    public FactsheetBase()
    {
        this.Load += new EventHandler(this.Page_Load);
    }

    public MyPageData Data { get; set; }  
    protected void Page_Load(object sender, EventArgs e) 
    { 
        // get data that's common to all implementors of FactsheetBase 
        // and store the values in FactsheetBase's properties 
        this.Data = ExtractPageData(Request.QueryString["data"]);             
    } 
}

另一种方法是重写 OnLoad()，但这种方法不太受欢迎。

public class FactsheetBase : System.Web.UI.Page 
{ 

    public FactsheetBase()
    {
    }

    public MyPageData Data { get; set; }  
    protected override void OnLoad(EventArgs e)
    {
        //your code
        // get data that's common to all implementors of FactsheetBase 
        // and store the values in FactsheetBase's properties 
        this.Data = ExtractPageData(Request.QueryString["data"]);             

        base.OnLoad(e);
    }
}

Answer 6

替代 Page_Load() 方法，重写 OnLoad() 并调用 PerformanceFactsheet 中的 base.OnLoad()