Question 85698 in ASP.NET Question posted in
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Accessing parent properties in UserControls from different aspx page – Asp.net

There is a aspx page which makes use of UserControl as follows.

Page1.aspx.cs

public class Page1
{
  public string Code {get;set;}
 ....

}

In the Page1.aspx a user control called "UsrControl"

<@Register TagPrefix="Usr" NameSpace="UsrControl">

I have the following code in UsrControl.

 public class UsrControl : Label
    {
      private Page1 _page1;
      
     protected override void OnInit(EventArgs e)
      {
        _page1 = (Page1)Page;
        string test = _page1.Code;
      }
.....
    }

In the usercontrol , the parent page is harcoded and from there the property of parent page (Page1) is being used .

Now the thing is I have one more aspx page Page2 which has same set of properties as Page1(Code) needed to invoke "UsrControl"

How can I refactor "UsrControl" to have the capability of accepting Page1 and Page2 and execute the code ? Should reflection be used?

Tags:

2

Answers


  1. 0

    It would be easier to turn it around. Set the Code value from the page to the UserControl instead of getting it from the Page.

    So in your UserControl add a property Code

    public string Code { get; set; }

    Then you can set that property from the aspx page of the parent.

    <Usr:WebUserControl1 ID="WebUserControl1" runat="server" Code='<%# Code %>' />

    And then call DataBind(); in Page_Load of the parent page.

    public string Code { get; set; }

protected void Page_Load(object sender, EventArgs e)
{
    Code = "This is a test.";

    DataBind();
}

    You can also add the UserControl programatically on the parent page and set Code from there.

    public WebUserControl1 UsrControl { get; set; }
public string Code { get; set; }

protected void Page_Load(object sender, EventArgs e)
{
    Code = "This is a test.";

    UsrControl = (WebUserControl1)LoadControl("~/WebUserControl1.ascx");
    UsrControl.Code = Code;
    PlaceHolder1.Controls.Add(UsrControl);
}
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  2. 0

    Just make an interface that shapes your data provider

    public class IPageDataProvider
{
  string Code {get;set;}
}

    and implement this interface in both your pages

    public class Page1 : IPageDataProvider
{
  public string Code {get;set;}
  ....

}

public class Page2 : IPageDataProvider
{
  public string Code {get;set;}
  ....

}

    After that, refactor your user control

    public class UsrControl : Label
{
  private IPageDataProvider _pageDataProvider;
  
  protected override void OnInit(EventArgs e)
  {
    this._pageDataProvider = this.Page as IPageDataProvider;
    if ( this._pageDataProvider != null )
    {
      string test = this._pageDataProvider.Code;
    }
    else
    {
      // parent page doesn't implement the interface
    }
  }
}
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