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2006-03-31T07:23:00.000-08:00

Worked more on devlist. Added pages on PHP and java .

Using OOP to pass variables to ASP.NET user controls

2006-03-09T15:57:00.000-08:00

Below is a simple example of using OOP to pass variables into ASP.NET user controls then creating the controls on post back. This code is currently used in http://www.devlist.com/.

namespace DevList.Lists{using System;using System.Data;using System.Drawing;using System.Web;using System.Web.UI.WebControls;using System.Web.UI.HtmlControls;using System.Web.UI;
/// <summary>///        Summary description for ShowList./// </summary>public class ShowList : System.Web.UI.UserControl{    protected System.Web.UI.WebControls.Label lblTitle;    protected System.Web.UI.WebControls.Label lblTable;    protected System.Web.UI.WebControls.Label lblDescription;
    private string _Title;    private string _Description;    protected System.Web.UI.WebControls.Label lblPrintButton;    private string _List;    private string _TableName;
    public string Title    {        get { return _Title; }        set { _Title = value; }    }
    public string Description    {        get { return _Description; }        set { _Description = value; }    }
    public string List    {        get { return _List; }        set { _List = value; }    }
    public string TableName    {        get { return _TableName; }        set { _TableName = value; }    }
    private void Page_Load(object sender, System.EventArgs e)    {
        lblTitle.Text = _Title.ToString();        lblDescription.Text = _Description.ToString();
        string szPrintHeader = _Title.ToString() + " - " + _Description.ToString();            Control cControlHolderPrintButton = this.FindControl("lblPrintButton");        //string szPrintButtonHTML = "<INPUT onclick=\"ShowTableInDocument('" +  _TableName + "','" + szPrintHeader + "');\" type=\"image\" src=\"Images/printer.gif\" value=\"Print\"></td>";        string szPrintButtonHTML = "<INPUT onclick=\"ShowTableInDocument('" +  _TableName + "','" + szPrintHeader + "');\" type=\"button\" value=\"Print\"></td>";        cControlHolderPrintButton.Controls.Add(new LiteralControl( szPrintButtonHTML ));
        Control cControlHolder = this.FindControl("lblTable");        Control c2 = Page.LoadControl(_List);        cControlHolder.Controls.Add(c2);
    }
    #region Web Form Designer generated code    override protected void OnInit(EventArgs e)    {        //        // CODEGEN: This call is required by the ASP.NET Web Form Designer.        //        InitializeComponent();        base.OnInit(e);    }
    /// <summary>    ///        Required method for Designer support - do not modify    ///        the contents of this method with the code editor.    /// </summary>    private void InitializeComponent()    {        this.Load += new System.EventHandler(this.Page_Load);
    }    #endregion}}

The object creation and enbedding is pretty simple:

using System;using System.Collections;using System.ComponentModel;using System.Data;using System.Drawing;using System.Web;using System.Web.SessionState;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.HtmlControls;
namespace DevList.Lists{/// /// Summary description for WebForm1./// 
public class CSharp : System.Web.UI.Page{protected System.Web.UI.WebControls.Label lblControlHolder;protected System.Web.UI.HtmlControls.HtmlForm Form1;
private void Page_Load(object sender, System.EventArgs e){// Put user code to initialize the page hereBuildTables(); //Leave in}
private void BuildTables(){Control cControlHolder = Page.FindControl("lblControlHolder");
ShowList slCSharpKeyWords = (ShowList) Page.LoadControl("Lists/ShowList.ascx");slCSharpKeyWords.Title = "C# Key Words Table";slCSharpKeyWords.Description = "Table of C# keywords and Descriptions";slCSharpKeyWords.List = "Lists/CSharpKeyWords.ascx";slCSharpKeyWords.TableName = "CSharpKeyWordsTable"; //Must match table name.  Will not show print screen correctly if not.cControlHolder.Controls.Add(slCSharpKeyWords);
}
#region Web Form Designer generated codeoverride protected void OnInit(EventArgs e){//// CODEGEN: This call is required by the ASP.NET Web Form Designer.//InitializeComponent();base.OnInit(e);
}
/// /// Required method for Designer support - do not modify/// the contents of this method with the code editor./// 
private void InitializeComponent(){this.Load += new System.EventHandler(this.Page_Load);}#endregion}}

ddw

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Using OOP to pass variables to ASP.NET user controls