Please review example below:
<%@ Page Language="C#" %> <html> <head id="Head1" runat="server"> <script runat="server"> public UserControl LoadControl(string UserControlPath, params object[] constructorParameters) { List<Type> constParamTypes = new List<Type>(); foreach (object constParam in constructorParameters) constParamTypes.Add(constParam.GetType()); UserControl ctl = Page.LoadControl(UserControlPath) as UserControl; ConstructorInfo constructor = ctl.GetType() .BaseType.GetConstructor(constParamTypes.ToArray()); if (constructor == null) throw new MemberAccessException("The requested constructor was not found on : " + ctl.GetType().BaseType.ToString()); else constructor.Invoke(ctl, constructorParameters); return ctl; } protected override void OnInit(EventArgs e) { base.OnInit(e); List<Employee> employees = new List<Employee>(); if (!this.IsPostBack) for (int i = 0; i < 10; i++) employees.Add(new Employee() { Id = "Emp" + i, Name = "Employee" + i }); List<object> parameters = new List<object>(); this.phUserControl.Controls.Add(this.LoadControl("~/UserControls/ActiveUserControl.ascx", employees, "Existing Employees")); } protected override void OnLoad(EventArgs e) { this.EnsureChildControls(); base.OnLoad(e); if (!this.IsPostBack) this.phUserControl.DataBind(); } </script> </head> <body> <form id="form1" runat="server"> <asp:PlaceHolder runat="server" ID="phUserControl"></asp:PlaceHolder> </form> </body> </html>
User Control
Markup:
<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="ActiveUserControl.ascx.cs" Inherits="ActiveTest.UserControls.ActiveUserControl" %> <div> <h1><asp:Label runat="server" ID="lblTitle" /></h1> <hr /> <asp:GridView runat="server" ID="grvEmployees" AutoGenerateColumns="false"> <Columns> <asp:TemplateField> <ItemTemplate> <asp:Label runat="server" ID="lblId" Text='<%# Eval("Id") %>'></asp:Label> </ItemTemplate> </asp:TemplateField> <asp:TemplateField> <ItemTemplate> <asp:TextBox runat="server" ID="txtName" Text='<%# Eval("Name") %>'></asp:TextBox> </ItemTemplate> </asp:TemplateField> </Columns> </asp:GridView> </div>
Code:
namespace ActiveTest.UserControls { [ParseChildren(true)] public partial class ActiveUserControl : UserControl { public List<Employee> Employees { get { return (List<Employee>)(ViewState["Employees"] ?? (ViewState["Employees"] = new List<Employee>())); } set { ViewState["Employees"] = value; } } public string Title { get; set; } public ActiveUserControl() { } public ActiveUserControl(List<Employee> employees, string title) { this.Employees = employees; this.Title = title; } public override void DataBind() { this.lblTitle.Text = this.Title; this.grvEmployees.DataSource = this.Employees; this.grvEmployees.DataBind(); } } [Serializable] public class Employee { public string Id { get; set; } public string Name { get; set; } } }
