在运行时在Asp.Net中使用CodeBehind创建UserControl

Question

如何在运行时从源文件创建usercontrol及其代码隐藏并加载到面板中？ 我很确定使用CodeDom可以解决这个问题，但不太确定如何解决这个问题。任何人都可以提供一个简化的例子吗？提前谢谢。

要编译的脚本示例

Option Infer On
Imports System
Imports System.Data
Imports System.Math
Imports System.Web.UI.WebControls
Imports System.Web.UI
Imports System.Web.UI.HtmlControls

Namespace Evaluator

Public Class Evaluator
    Dim Project As New UserControl

    Dim Panel1 As New Panel
    Dim WithEvents Button1 As New Button
    Dim WithEvents TextBox1 As New TextBox

    Public Function GetProject(ByVal ParamArray expr() As Object) As UserControl

        'panel 1
        Panel1.Style.Add("background-color", "#D9E0E8")
        Panel1.Style.Add("padding-top", "5px")
        Panel1.Style.Add("margin-top", "5px")
        Panel1.Style.Add("width", "490px")
        Panel1.Style.Add("height", "30px")
        Project.Controls.Add(Panel1)

        'button 1
        Button1.ID = "Button1"
        Button1.Text = "Add"
        Button1.Width = 100
        AddHandler Button1.Click, AddressOf Button1_Click
        Panel1.Controls.Add(Button1)

        'textbox 1
        TextBox1.ID = "TextBox1"
        TextBox1.Width = 200
        TextBox1.Text = 0
        Panel1.Controls.Add(TextBox1)

        Return Project
    End Function

    Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        TextBox1.Text += 1
    End Sub

End Class

End Namespace

SAMPLE网页（Code Behind）编译它

   Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
    Dim filePath = Server.MapPath("script.vb")
    Dim provider = VBCodeProvider.CreateProvider("VisualBasic")
    Dim opts = New CompilerParameters({"mscorlib.dll", "System.dll", "System.Web.dll", "Microsoft.VisualBasic.dll", "System.Data.dll", "System.Xml.dll", "System.Data.Linq.dll", "System.Core.dll", "System.Drawing.dll", "System.Web.Extensions.dll", "System.Data.DataSetExtensions.dll"})
    opts.CompilerOptions = "/t:library"
    opts.TreatWarningsAsErrors = False
    opts.GenerateExecutable = False
    opts.GenerateInMemory = True
    Dim cr = provider.CompileAssemblyFromFile(opts, New String() {filePath})

    'Check for compile errors
    If cr.Errors.Count > 0 Then
        HttpContext.Current.Session("_evaluator") = Nothing
        For Each err As CompilerError In cr.Errors
            Debug.Print(err.ErrorText, err.Line)
        Next
    Else
        'Create the Assembly and store in memory
        Dim evaluator As Object = Nothing
        evaluator = cr.CompiledAssembly.CreateInstance("Evaluator.Evaluator")
        HttpContext.Current.Session("_evaluator") = evaluator
        HttpContext.Current.Session("MyAssembly") = cr.CompiledAssembly.FullName
    End If

    Panel1.Controls.Clear()
    Call Evaluate()

End Sub

Public Sub Evaluate()

    Try
        'Invoke method
        Dim Evaluator As Object = CType(HttpContext.Current.Session("_evaluator"), Object)
        Dim objResult As Object = Evaluator.GetType.InvokeMember("GetProject", BindingFlags.InvokeMethod + Reflection.BindingFlags.Default, Nothing, Evaluator, Nothing)

        If Not objResult Is Nothing Then
            Panel1.Controls.Add(objResult)
        End If

    Catch ex As Exception
        Debug.Print(ex.Message)
    End Try
End Sub