Vb.net Run Script inside Textbox

Question

I was wondering if there is a way to excute a Script that is in Textbox1 Like you write this code inside textbox1

msgbox("Hello World")

and when you click on the button or press enter it will run the command/script you wrote in Textbox1

Answer 1

Yes, you can. This is a bit messy and was cobbled together from various articles on the web, but you get the general idea...

Imports System.IO
Imports System.Reflection
Imports System.CodeDom
Imports System.CodeDom.Compiler
Imports Microsoft.VisualBasic
Public Class Form1
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        ' read code from textbox
        Dim Code As String = TextBox1.Text
        ' clear output textbox
        TextBox2.Clear()
        ' create fully functional assembly string
        Code = ("Imports System" & vbCrLf &
                "Imports System.Windows.Forms" & vbCrLf &
                "Imports Microsoft.Visualbasic" & vbCrLf &
                "Public Class TempClass" & vbCrLf &
                "Public Sub MyCode(ByVal Textbox2 As TextBox)" & vbCrLf &
                Code & vbCrLf &
                "End Sub" & vbCrLf &
                "End Class")
        ' create the compiler
        Dim vbProv = New VBCodeProvider()
        ' create parameters to pass to the compiler
        Dim vbParams = New CompilerParameters()
        ' add referenced assemblies.  
        vbParams.ReferencedAssemblies.Add("System.dll")
        vbParams.ReferencedAssemblies.Add("System.Windows.Forms.dll")
        vbParams.ReferencedAssemblies.Add("Microsoft.VisualBasic.dll")
        ' generate an assembly in memory
        vbParams.GenerateExecutable = False
        vbParams.GenerateInMemory = True
        ' give it a name
        vbParams.OutputAssembly = "MyCode"
        ' compile the code and get the compiler results
        Dim compResults = vbProv.CompileAssemblyFromSource(vbParams, Code)
        ' check for compile errors  
        If compResults.Errors.HasErrors Then
            Dim ErrorMsg As String = compResults.Errors.Count.ToString & " Errors:"
            For x As Integer = 0 To compResults.Errors.Count - 1
                ErrorMsg = ErrorMsg & vbCrLf & "Line: " & compResults.Errors(x).Line.ToString & " - " + compResults.Errors(x).ErrorText
            Next
            TextBox2.Text = ErrorMsg & vbCrLf & vbCrLf + Code
        Else
            ' create instance of the temporary compiled class
            Dim obj As Object = compResults.CompiledAssembly.CreateInstance("TempClass")
            ' use textbox 2 for output
            Dim args() As Object = {Me.TextBox2}
            Try
                ' execute the code  
                Dim result As Object = obj.GetType().InvokeMember("MyCode", BindingFlags.InvokeMethod, Nothing, obj, args)
            Catch Oops As Exception
                ' oops
                MessageBox.Show(Oops.Message)
            End Try
        End If
    End Sub
End Class

Answer 2

You're looking for CodeDOM. This basically lets you run the compiler from within your program. Be careful, the user could type anything into the box and compromise your program with it.