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我有一个控件:定义按钮的复合控件。在使控件可见之前,该按钮调用一个 Command 事件并设置另一个控件的属性的值。

这两个控件都是事先在容器控件中实例化的。我需要在 CreateChildControls() 方法中获取第二种形式的属性值,但是,这是不可能的,为什么?

设想:

public class Main : CompositeControl
{ 
    #region fields
    private StepPersonal _stepPersonal;
    private StepFinancial _stepFinancial;
    #endregion

    protected override CreateChildControls()
    {
        this._stepPersonal = new StepPersonal { ID = "StepPersonal1", Visible = true };
        this.Controls.Add(this._stepPersonal);
        this._stepFinancial = new StepFinancial { ID = "StepFinancial1", Visible = false };
        this.Controls.Add(this._stepFinancial);
    }

    protected override Render(HtmlTextWriter writer)
    {
        this._stepPersonal.RenderControl(writer);
        this._stepFinancial.RenderControl(writer);
    }
}

步骤个人:

public class StepPersonal : CompositeControl
{
    #region fields
    private Button _checkDetails;
    #endregion

    protected override CreateChildControls()
    {
        this._checkDetails = new Button { ID = "CheckDetailsButton", Text = "CheckDetails", CommandName = "DetailsConfirmation" }
        this._checkDetails.Command += new CommandEventHandler(this.OnCheckDetails);
        this.Controls.Add(this._checkDetails);
    }

    protected override Render(HtmlTextWriter writer)
    {
        this._checkDetail.RenderControl(writer);        
    }

    protected void OnCheckDetails(object sender, CommandEventArgs args)
    {
        string argument = args.CommandArgs.ToString();

        this.Visible = false;
        Main owner = (sender as Button).FindParent<Main>(); // custom extension method
        StepFinancial sf = owner.FindControl<StepFinancial>("StepFinancial1");
        sf.Argument = argument;
        sf.Visible = false;
    }
}

最后,这就是我的问题所在,StepFinancial 控制

public class StepFinancial : CompositeControl
{
    #region fields
    private TextBox _argumentTextBox;
    #endregion

    #region properties
    public string Argument { get; set; }
    #endregion

    protected override CreateChildControls()
    {
        string argument = this.Argument; // this is always null

        // I have buttons in here (not being displayed) who's events are not wiring up
        // if I move this into a method, and call the method in Render(), as it seems
        // to allow me access to the properties there, but I need the value here?
    }

    protected override Render(HtmlTextWriter writer)
    {
        string argument = this.Argument; // this contains the value of the property set previously

        this._argumentTextBox.RenderControl(writer);
    }
}

我已经尝试将值添加到 StateBag,没有。我尝试在 CommandEventHanlder 中添加一个 QueryString,但得到一个集合被锁定的错误消息。我尝试了缓存和会话(会话不起作用,因为这将被部署到 SharePoint),所以这是不可能的。我试过谷歌搜索,Bing'ing 甚至 Yahoo! 这但没有运气。

更新 我没有提到,我无法将控件添加到 OnPreRender 下的集合中,因为它不会连接任何事件。我也不能使用 EnsureChildControls,因为它搞砸了应用程序的其他部分。但是,我可以将这个级别的属性值添加到状态包中,但我觉得这是一种非常糟糕的方式。

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1 回答 1

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我并没有真正解决这个问题,我会觉得很舒服,但我有一个基于此的 NoSQL 解决方案,并将控件之间的值存储在那里,并在应用程序关闭时处理它。

于 2012-03-20T16:56:32.837 回答