C# 動態新增User Control，並設定屬性值與取屬性值

新增一個UserControl
ascx:

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="CustIDName.ascx.cs" Inherits="UserControl_CustIDName" %>
<%@ Register Assembly="Joey" Namespace="Joey" TagPrefix="cc1" %>

.ascx.cs

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class UserControl_CustIDName : System.Web.UI.UserControl
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    public string CustID
    {
        get
        { return this.JoeyTextBox1.mTextBox.Text; }
        set
        { this.JoeyTextBox1.mTextBox.Text = value; }

    }
    public string CustName
    {
        get
        { return this.JoeyTextBox2.mTextBox.Text; }
        set
        { this.JoeyTextBox2.mTextBox.Text = value; }

    }
    public string ValidationGroup
    {
        get
        { return this.JoeyTextBox1.ValidationGroup; }
        set
        { 
            this.JoeyTextBox1.ValidationGroup = value;
            this.JoeyTextBox2.ValidationGroup = value; 
        }
    }
}

接著我們在一個空白頁面上，加入一個panel

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class LoopAddUserControl : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            this.DropDownList1.Items.Add(new ListItem("user control index"));
            for (int i = 0; i < 10; i++)
   {                
                this.DropDownList1.Items.Add(new ListItem(i.ToString()));
   }            
        }

        for (int index = 0; index < 10; index++)
        {
            Control ctlNewTrial = this.Page.LoadControl("UserControl/CustIDName.ascx");
            SetUserControlProperty(ctlNewTrial, "ID", "Usrctrl" + index.ToString());
            SetUserControlProperty(ctlNewTrial, "CustID", index.ToString());
            SetUserControlProperty(ctlNewTrial, "CustName", index.ToString()+":name");

            this.Panel1.Controls.Add(ctlNewTrial);
            Label br = new Label();
            br.Text = "index=" + index.ToString()+ "
";
            this.Panel1.Controls.Add(ctlNewTrial);
            this.Panel1.Controls.Add(br);
        }
    }

    /// 

    /// 設定user control的屬性值
    /// 
    /// usercontrol by page.loadcontrol()
    /// usercontrol's property
    /// setting property value
    /// 
    public void SetUserControlProperty(Control vobjControl, string vstrPropertyName, object vobjValue)
    {
        vobjControl.GetType().GetProperty(vstrPropertyName).SetValue(vobjControl, vobjValue, null);
    }
    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {        
        ASP.usercontrol_custidname_ascx usrctl1 = (ASP.usercontrol_custidname_ascx)this.Panel1.FindControl("Usrctrl" + this.DropDownList1.SelectedValue);
        if (usrctl1 != null)
        {
            this.TextBox1.Text = usrctl1.CustID;
            this.TextBox2.Text = usrctl1.CustName;
        }
        else
        {
            this.TextBox1.Text = string.Empty;
            this.TextBox2.Text = string.Empty;
        }
    }
}

參考文件
[ASP.NET]動態Load UserControl – part 2 - In 91- 點部落
WebUserControl之間值得傳遞(使用Interface) - topcat 姍舞之間的極度凝聚- 點部落
[ASP.NET]動態新增User Control，並設定屬性值與取屬性值 - In 91- 點部落