“的TestString”未声明。它可能无法访问由于其保护水平。 （BC30451） [英] 'TestString' is not declared. It may be inaccessible due to its protection level. (BC30451)

问题描述

我尝试了一些对飞code编译使用 VB codeProvider 类。我希望能够做的就是在我的code组装修改公共变量。

I am trying out some on the fly code compilation using the VBCodeProvider class. What I want to be able to do is modify a public variable in my assembly in the code.

我有一个公开的TestString的String =在我的应用程序。

I have a Public TestString As String = "" in my application.

这是在code我使用编译：

This is the code I am using to compile:

    Dim codeProvider As New VBCodeProvider()
    Dim optParams As New CompilerParameters
    optParams.ReferencedAssemblies.Add("MyAssembly.exe")
    optParams.ReferencedAssemblies.Add("system.windows.forms.dll")
    optParams.CompilerOptions = "/t:library"
    optParams.GenerateInMemory = True
    Dim results As CompilerResults = codeProvider.CompileAssemblyFromSource(optParams, RichTextBox1.Text)

    If results.Errors.Count > 0 Then
        Dim sb As New StringBuilder("Compilation Failed with the following error(s)" + CR_LF + CR_LF)
        For Each CompErr As CompilerError In results.Errors
            sb.Append(String.Format("Line {0} - {1} ({2}){3}", CompErr.Line, CompErr.ErrorText, CompErr.ErrorNumber, CR_LF))
        Next
        MessageBox.Show(sb.ToString, "Compile Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
    Else
        Dim assy As System.Reflection.Assembly = results.CompiledAssembly
        Dim exeinstance As Object = assy.CreateInstance("Script")
        Dim typ As Type = exeinstance.GetType
        Dim method As MethodInfo = typ.GetMethod("Main")
        method.Invoke(exeinstance, Nothing)
    End If

这是在code在我的文本框：

This is the code in my textbox:

Imports System
Imports MyAssembly

Class Script
    Sub Main()
       TestString="foo"' <-- This line fails compilation
    End Sub
End Class

我得到的错误是的TestString未声明。它可能无法访问由于其保护水平。 （BC30451）

推荐答案

就像正常的VB.NET，以及添加一个参考，你必须进口相关命名空间，或完全指定。 （你编辑的问题，现在包括这个。）

Just like normal VB.NET, as well as adding a reference, you have to Imports the relevant namespace, or specify it fully. (You've edited the question to now include this.)

插入你的code到VS2008中的一个新的控制台项目（因为这是我不得不打开），并调整了我的程序集名称后，我看到了一样的你。

After inserting your code into a new Console project in VS2008 (because that's what I had open) and adjusting for my assembly names, I saw the same as you.

我固定它通过添加公开为默认的模块模块1 。

I fixed it by adding Public to the default Module Module1.

这篇关于“的TestString”未声明。它可能无法访问由于其保护水平。 （BC30451）的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！