asp.net中的动态控件创建、事件处理和控件属性

我试图解决以下问题：

我有一个需要在另一个控件中动态加载的用户控件。这个动态加载的控件会引发一个事件，据我所知，只有在onload事件期间创建并加载控件时，才会正确处理动态加载控件引发的事件。还有一个约束，我必须考虑当加载控件的动态，这是一个属性在父控件。此属性将确定是否应加载控件

伪代码：

ControlA
  Property ShowControl
  ControlA has a CheckBox(chkShowControlIfSelected)
  OnLoadEvent()
    If chkShowControlIfSelected.checked checked and ShowControlProperty is set
    {
       reate ControlB Dynamically
       ControlB.Event += EventHandler()
       Add ControlB to ControlCollection
    }

我遇到的问题是，如果我在prerender事件中包含加载controlB的代码，那么属性ShowControl设置正确，但没有调用EventHandler（）。如果我在pageLoad事件中动态加载controlB的代码，则尚未设置属性ShowControl，但在这种情况下，正确调用了eventHandler代码

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我是否丢失了某些内容或在错误的事件处理程序中处理代码

以下是工作示例：

ControlA:

public partial class ControlA : System.Web.UI.UserControl
{
    public bool ShowControl
    {
        get
        {
            if (this.ViewState["ShowControl"] == null)
                return false;
            else
                return (bool)this.ViewState["ShowControl"];
        }
        set
        {
            this.ViewState["ShowControl"] = value;
        }
    }
    protected void Page_Load(object sender, EventArgs e)
    {
        if (this.ShowControl)
        {
            var controlB = (ControlB)this.LoadControl("ControlB.ascx");
            controlB.FileUploadingComplete += controlB_FileUploadingComplete;
            this.pnl1.Controls.Add(controlB);
        }
    }

    void controlB_FileUploadingComplete(object sender, EventArgs e)
    {
        //throw new NotImplementedException();
        Trace.Write("file upload completed");
    }
}

public partial class ControlB : System.Web.UI.UserControl
{
    public event EventHandler FileUploadingComplete;
    protected void OnFileUploadingComplete()
    {
        if (this.FileUploadingComplete != null)
            this.FileUploadingComplete(this, EventArgs.Empty);
    }

    protected void btn1_Click(object sender, EventArgs e)
    {
        this.OnFileUploadingComplete();
    }
}

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        this.ControlA1.ShowControl = true;
    }
}

控制B:

public partial class ControlA : System.Web.UI.UserControl
{
    public bool ShowControl
    {
        get
        {
            if (this.ViewState["ShowControl"] == null)
                return false;
            else
                return (bool)this.ViewState["ShowControl"];
        }
        set
        {
            this.ViewState["ShowControl"] = value;
        }
    }
    protected void Page_Load(object sender, EventArgs e)
    {
        if (this.ShowControl)
        {
            var controlB = (ControlB)this.LoadControl("ControlB.ascx");
            controlB.FileUploadingComplete += controlB_FileUploadingComplete;
            this.pnl1.Controls.Add(controlB);
        }
    }

    void controlB_FileUploadingComplete(object sender, EventArgs e)
    {
        //throw new NotImplementedException();
        Trace.Write("file upload completed");
    }
}

public partial class ControlB : System.Web.UI.UserControl
{
    public event EventHandler FileUploadingComplete;
    protected void OnFileUploadingComplete()
    {
        if (this.FileUploadingComplete != null)
            this.FileUploadingComplete(this, EventArgs.Empty);
    }

    protected void btn1_Click(object sender, EventArgs e)
    {
        this.OnFileUploadingComplete();
    }
}

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        this.ControlA1.ShowControl = true;
    }
}

页面（有

ControlA

present）：

public partial class ControlA : System.Web.UI.UserControl
{
    public bool ShowControl
    {
        get
        {
            if (this.ViewState["ShowControl"] == null)
                return false;
            else
                return (bool)this.ViewState["ShowControl"];
        }
        set
        {
            this.ViewState["ShowControl"] = value;
        }
    }
    protected void Page_Load(object sender, EventArgs e)
    {
        if (this.ShowControl)
        {
            var controlB = (ControlB)this.LoadControl("ControlB.ascx");
            controlB.FileUploadingComplete += controlB_FileUploadingComplete;
            this.pnl1.Controls.Add(controlB);
        }
    }

    void controlB_FileUploadingComplete(object sender, EventArgs e)
    {
        //throw new NotImplementedException();
        Trace.Write("file upload completed");
    }
}

public partial class ControlB : System.Web.UI.UserControl
{
    public event EventHandler FileUploadingComplete;
    protected void OnFileUploadingComplete()
    {
        if (this.FileUploadingComplete != null)
            this.FileUploadingComplete(this, EventArgs.Empty);
    }

    protected void btn1_Click(object sender, EventArgs e)
    {
        this.OnFileUploadingComplete();
    }
}

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        this.ControlA1.ShowControl = true;
    }
}

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从何处设置

ShowControl

属性？您是否使用

ViewState

实现了此属性？该属性是从父页面设置的。是的，该属性已使用ViewState实现。非常感谢您的帮助。我会尝试一下并更新帖子。