C#调用JavaScript引擎

下面通过两部分来说明实现以及应用。

一．使用MSScriptControl

到微软的网站上下载Windows Script Control，它是一个ActiveX(R) 控件，所以在.NET中使用我Interop了一下。下载安装完成后，新建一个C#的Windows应用程序项目，在解决方案资源管理器中选中引用节点，右键点击选择添加引用菜单，弹出添加引用对话框，单击浏览找到安装Windows Script Control的目录，选取msscript.ocx文件确定。那么在引用节点下会增加一个MSScriptControl组件，下面是他Interop后的所有对象。

  

using System;

using MSScriptControl;

using System.Text;

namespace ZZ

{

     /// <summary>

     /// 脚本类型

     /// </summary>

     public enum ScriptLanguage

     {

         /// <summary>

         /// JScript脚本语言

         /// </summary>

         JScript,

         /// <summary>

         /// VBscript脚本语言

         /// </summary>

         VBscript,

         /// <summary>

         /// JavaScript脚本语言

         /// </summary>

         JavaScript

     }

     /// <summary>

     /// 脚本运行错误代理

     /// </summary>

     public delegate void RunErrorHandler();

     /// <summary>

     /// 脚本运行超时代理

     /// </summary>

     public delegate void RunTimeoutHandler();

     /// <summary>

     /// ScriptEngine类

     /// </summary>

     public class ScriptEngine

     {

         ******* ScriptControl msc;

         //定义脚本运行错误事件

         public event RunErrorHandler RunError;

         //定义脚本运行超时事件

         public event RunTimeoutHandler RunTimeout;

         /// <summary>

         ///构造函数

         /// </summary>

         public ScriptEngine():this(ScriptLanguage.VBscript)

         {

         }

         /// <summary>

         /// 构造函数

         /// </summary>

         /// <param name="language">脚本类型</param>

         public ScriptEngine(ScriptLanguage language)

         {

              this.msc = new ScriptControlClass();

              this.msc.UseSafeSubset = true;

              this.msc.Language = language.ToString();

              ((DScriptControlSource_Event)this.msc).Error += new DScriptControlSource_ErrorEventHandler(ScriptEngine_Error);

              ((DScriptControlSource_Event)this.msc).Timeout += new DScriptControlSource_TimeoutEventHandler(ScriptEngine_Timeout);

         }

         /// <summary>

         /// 运行Eval方法

         /// </summary>

         /// <param name="expression">表达式</param>

         /// <param name="codeBody">函数体</param>

         /// <returns>返回值object</returns>

         public object Eval(string expression,string codeBody)

         {

              msc.AddCode(codeBody);

              return msc.Eval(expression);

         }

         /// <summary>

         /// 运行Eval方法

         /// </summary>

         /// <param name="language">脚本语言</param>

         /// <param name="expression">表达式</param>

         /// <param name="codeBody">函数体</param>

         /// <returns>返回值object</returns>

         public object Eval(ScriptLanguage language,string expression,string codeBody)

         {

              if(this.Language != language)

                   this.Language = language;

              return Eval(expression,codeBody);

         }

         /// <summary>

         /// 运行Run方法

         /// </summary>

         /// <param name="mainFunctionName">入口函数名称</param>

         /// <param name="parameters">参数</param>

         /// <param name="codeBody">函数体</param>

         /// <returns>返回值object</returns>

         public object Run(string mainFunctionName,object[] parameters,string codeBody)

         {

              this.msc.AddCode(codeBody);

              return msc.Run(mainFunctionName,ref parameters);

          }

         /// <summary>

         /// 运行Run方法

         /// </summary>

         /// <param name="language">脚本语言</param>

         /// <param name="mainFunctionName">入口函数名称</param>

         /// <param name="parameters">参数</param>

         /// <param name="codeBody">函数体</param>

         /// <returns>返回值object</returns>

         public object Run(ScriptLanguage language,string mainFunctionName,object[] parameters,string codeBody)

         {

              if(this.Language != language)

                   this.Language = language;

              return Run(mainFunctionName,parameters,codeBody);

         }

         /// <summary>

         /// 放弃所有已经添加到 ScriptControl 中的 Script 代码和对象

         /// </summary>

         public void Reset()

         {

              this.msc.Reset();

         }

         /// <summary>

         /// 获取或设置脚本语言

         /// </summary>

         public ScriptLanguage Language

         {

              get{return (ScriptLanguage)Enum.Parse(typeof(ScriptLanguage),this.msc.Language,false);}

              set{this.msc.Language = value.ToString();}

         }

         /// <summary>

         /// 获取或设置脚本执行时间，单位为毫秒

         /// </summary>

         public int Timeout

         {

              get{return this.msc.Timeout;}

              set{this.msc.Timeout = value;}

         }

         /// <summary>

         /// 设置是否显示用户界面元素

         /// </summary>

         public bool AllowUI

         {

              get{return this.msc.AllowUI;}

              set{this.msc.AllowUI = value;}

         }

         /// <summary>

         /// 宿主应用程序是否有保密性要求

         /// </summary>

         public bool UseSafeSubset

         {

              get{return this.msc.UseSafeSubset;}

              set{this.msc.UseSafeSubset = true;}

         }

         /// <summary>

         /// RunError事件激发

         /// </summary>

         private void OnError()

         {

              if(RunError!=null)

                   RunError();

         }

         /// <summary>

         /// OnTimeout事件激发

         /// </summary>

         private void OnTimeout()

         {

              if(RunTimeout!=null)

                   RunTimeout();

         }

         private void ScriptEngine_Error()

         {

              OnError();

         }

         private void ScriptEngine_Timeout()

         {

              OnTimeout();

         }

     }

}

上面的包装定义了一个ScriptLanguage枚举，这样操作起来更方便一点。另外脚本引擎包括了Error事件和Timeout事件，根据实际使用情况可进行注册。

 

二．脚本引擎演示

     我建了个窗体程序，测试包括脚本语言的选择，是否开启AllowUI属性，超时时间的设置，以及脚本引擎调用方法的选择。测试程序代码比较长，下面列出了主要部分：

using System;

using System.Drawing;

using System.Collections;

using System.ComponentModel;

using System.Windows.Forms;

using System.Data;

namespace ZZ

{

     public class Form1 : System.Windows.Forms.Form

     {

         private ScriptEngine scriptEngine;

         private System.Windows.Forms.CheckBox checkBoxAllowUI;

         private System.Windows.Forms.TextBox textBoxResult;

         private System.Windows.Forms.NumericUpDown numericUpDownTimeout;

         private System.Windows.Forms.TextBox textBoxCodeBody;

         private System.Windows.Forms.Button buttonRun;

         private System.Windows.Forms.Button buttonCancel;

         private System.Windows.Forms.ComboBox comboBoxScript;

         private System.Windows.Forms.TextBox textBoxParams;

         private System.Windows.Forms.RadioButton radioButtonEval;

         private System.Windows.Forms.RadioButton radioButtonRun;

         private System.Windows.Forms.TextBox textBoxMethodName;

         private System.ComponentModel.Container components = null;

 

         public Form1()

         {

              InitializeComponent();

              this.comboBoxScript.SelectedIndex = 0;

              this.scriptEngine = new ScriptEngine();

              this.scriptEngine.UseSafeSubset = true;

              this.scriptEngine.RunError += new RunErrorHandler(scriptEngine_RunError);

              this.scriptEngine.RunTimeout += new RunTimeoutHandler(scriptEngine_RunTimeout);

         }

         protected override void Dispose( bool disposing )

         {

              if( disposing )

                   if (components != null)

                       components.Dispose();

              base.Dispose( disposing );

         }

         #region Windows 窗体设计器生成的代码

         private void InitializeComponent()

         {

              //省略

         }

         #endregion

          [STAThread]

         static void Main()

         {

              Application.Run(new Form1());

         }

         //运行脚本

         private void buttonRun_Click(object sender, System.EventArgs e)

         {

              this.scriptEngine.Reset();

              this.scriptEngine.Language = (ScriptLanguage)Enum.Parse(typeof(ScriptLanguage),this.comboBoxScript.SelectedItem.ToString());

              this.scriptEngine.Timeout = (int)this.numericUpDownTimeout.Value;

              this.scriptEngine.AllowUI = this.checkBoxAllowUI.Checked;

              if(this.radioButtonEval.Checked)//执行Eval方法

              {

                   this.textBoxResult.Text = this.scriptEngine.Eval(this.textBoxMethodName.Text+"("+this.textBoxParams.Text+")",this.textBoxCodeBody.Text).ToString();

              }

              else//执行Run方法

              {

                   string[] parameters = (string[])this.textBoxParams.Text.Split(',');

                   object [] paramArray = new object[parameters.Length];

                   for(int i = 0;i<parameters.Length;i++)

                       paramArray[i] = Int32.Parse(parameters[i]);

                   this.textBoxResult.Text = this.scriptEngine.Run(this.textBoxMethodName.Text,paramArray,this.textBoxCodeBody.Text).ToString();

              }

         }

         //退出程序

         private void buttonCancel_Click(object sender, System.EventArgs e)

         {

              this.Close();

         }

         //错误函数

         private void scriptEngine_RunError()

         {

              MessageBox.Show("RunError执行脚本错误!");

         }

         private void scriptEngine_RunTimeout()

         {

              MessageBox.Show("RunTimeout执行脚本超时，引发错误!");

         }

     }

}

 

 

 

 

在文本框中写了一个JavaScript的函数。输入12，输出12000012。

如果把超时时间调整为1毫秒，那么执行该脚本就会跳出下面的超时提醒框，同时激发事件。

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