罗斯林VisualBasic.ScriptEngine犯规承认hostObject写在C＃ [英] Roslyn VisualBasic.ScriptEngine doesnt recognize hostObject written on C#

问题描述

我们的项目需要有一个简单的业务规则的能力，我们的客户可以在Visual Basic脚本。虽然我们的主要项目是写在C＃

哪些客户要EXECUT可能是这样的（我正在考虑的simpliest可能的情况下）的剧本

  VAR vbCode = @
。如果（Row.Code = 12），然后
 Row.MappedCode = 1 
端如果 
  

因此，我创建在C＃中RowData类代码和MappedCode性能

 命名空间ScriptModel 
 {
公共类RowData 
 {
公众诠释代码{搞定;组; } 
公众诠释MappedCode {搞定;组; } 
} 
} 
  

我创建了一个简单的主机对象类像

 命名空间ScriptModel 
 {
公共类HostObjectModel 
 {
公共RowData行{得到;组; } 
 
} 
} 
  

使用Roslyn.Scripting.VisualBasic .ScriptEngine我创建一个引擎，
创建一个会话与HostObjectModel的实例，并进行engine.Execute（vbCode，会话）

  VAR hostObj =新HostObjectModel（）; 
 
 hostObj.Row =新RowData（）; 
 hostObj.Row.Code = 12; 
 
变种引擎=新Roslyn.Scripting.VisualBasic.ScriptEngine（
新议会[] {hostObj.GetType（）。大会}，
新的字符串[] {ScriptModel }）; 
 
 VAR会话= Session.Create（hostObj）; 
 
 engine.Execute（vbCode，会话）; 
  

和它告诉我，

（2,25）：错误BC30451：'行'未声明。这可能是人迹罕至的
由于其保护级别。

但是，如果我在C＃创建类似的代码段

<如果pre> VAR csharpCode = @
（Row.Code == 12）
{
行。 MappedCode = 1;
};;


和使用CSharp.ScriptEngine这一切都会正常工作

那么，什么是一个问题，为什么VisualBasic.ScriptEngine无法看到这是在C＃编译的类，它应该是，我认为，基于相同的MSIL语言或我错了的公共属性？

---

更新：我在VB安装Visual Basic和创建ScriptModel库。我也换成ROW（）函数行物业无论是在类的声明，并在vbCode。没有帮助。 :(似乎VisualBasic.ScriptEngine不工作在所有的时候我从C＃中运行它。

解决方案

有关VB脚本，我发现你有包括在脚本的开头如下：

 进口ScriptModel 
  

我猜你会自动预挂起上面的代码字符串，因此用户不需要记住，包括它。

我一直没能得到，当作为的ScriptEngine创建的一部分添加它的工作也似乎不使用事后工作：

  engine.ImportedNamespaces.Append（ScriptModel）; 
  

这是尽管事后ImportedNamespaces计数为1。用c＃你似乎并不需要在所有导入的命名空间。

Our project need ability to have a simple business rules our customers can script in Visual basic. While our main program is written on C#

The script which customers want to execut could be like this (I am considering the simpliest possible case)

var vbCode = @"
    If (Row.Code = 12) Then 
        Row.MappedCode = 1
    End If";

So I created a RowData class in C# with Code and MappedCode properties

namespace ScriptModel
{
    public class RowData
    {
        public int Code { get; set; }
        public int MappedCode { get; set; }
    }
}

I created a simple host object class like

namespace ScriptModel
{
    public class HostObjectModel
    {
        public RowData Row { get; set; }

    }
}

Using Roslyn.Scripting.VisualBasic.ScriptEngine I create an engine, create a session with an instance of HostObjectModel and perform engine.Execute(vbCode, session)

   var hostObj = new HostObjectModel();

   hostObj.Row = new RowData();
   hostObj.Row.Code = 12;

   var engine = new Roslyn.Scripting.VisualBasic.ScriptEngine(
                    new Assembly[] {hostObj.GetType().Assembly},
                    new string[] {"ScriptModel"} );

   var session = Session.Create(hostObj);

   engine.Execute(vbCode , session); 

And it tells me that

(2,25): error BC30451: 'Row' is not declared. It may be inaccessible due to its protection level.

But if I create the similar code snippet on C#

 var csharpCode = @"
                    if (Row.Code == 12) 
                    {  
                        Row.MappedCode = 1;
                    };";

and use CSharp.ScriptEngine it all will work correctly

So, what is a problem, why VisualBasic.ScriptEngine not able to see public properties of the class which was compiled in C#, it should be, I think, based on the same MSIL language or I am wrong?

---

Update: I installed Visual Basic and created ScriptModel library on VB. I also replaced Row property with Row() function both in class declaration and in vbCode. Neither helped. :( seems that VisualBasic.ScriptEngine doesnt work at all when I run it from C#.

解决方案

For VB scripting I found you have to include the following at the start of the script:

Imports ScriptModel

I guess you could automatically pre-pend the above to the code string so your users don't need to remember to include it.

I have not been able to get it to work when added as part of the ScriptEngine creation. It also doesn't seem to work afterwards by using:

engine.ImportedNamespaces.Append("ScriptModel");

This is despite the fact that afterwards the ImportedNamespaces count is 1. With c# you don't seem to need to import the namespace at all.

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