微软自家的.Net下的JavaScript引擎——ClearScript

最新推荐文章于 2025-05-24 16:13:00 发布

转载最新推荐文章于 2025-05-24 16:13:00 发布 · 1k 阅读

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CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/TianFang/p/3470230.html

文章标签：

#javascript #c# #ViewUI

本文介绍了微软开源的ClearScript JavaScript引擎，该引擎不仅支持JavaScript还支持VBScript，并且提供了丰富的示例代码展示如何使用该引擎与.NET环境进行交互。

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之前我介绍过一个开源的.Net下的Javascript引擎Javascript .NET，今天发现微软自己也开源了一个JavaScript引擎——ClearScript（当然，也支持VB Script）。

由于是微软发布的，基本上没有什么好挑剔的地方，稳定而强大，不过不支持WinRT。下面这个则是官方示例，就不做更多介绍了，感兴趣的朋友可以去CodePlex看下。

 1 using System;
 2 using Microsoft.ClearScript;
 3 using Microsoft.ClearScript.V8;
 4 
 5 // create a script engine
 6 using (var engine = new V8ScriptEngine())
 7 {
 8     // expose a host type
 9     engine.AddHostType("Console", typeof(Console));
10     engine.Execute("Console.WriteLine('{0} is an interesting number.', Math.PI)");
11 
12     // expose a host object
13     engine.AddHostObject("random", new Random());
14     engine.Execute("Console.WriteLine(random.NextDouble())");
15 
16     // expose entire assemblies
17     engine.AddHostObject("lib", new HostTypeCollection("mscorlib", "System.Core"));
18     engine.Execute("Console.WriteLine(lib.System.DateTime.Now)");
19 
20     // create a host object from script
21     engine.Execute(@"
22         birthday = new lib.System.DateTime(2007, 5, 22);
23         Console.WriteLine(birthday.ToLongDateString());
24     ");
25 
26     // use a generic class from script
27     engine.Execute(@"
28         Dictionary = lib.System.Collections.Generic.Dictionary;
29         dict = new Dictionary(lib.System.String, lib.System.Int32);
30         dict.Add('foo', 123);
31     ");
32 
33     // call a host method with an output parameter
34     engine.AddHostObject("host", new HostFunctions());
35     engine.Execute(@"
36         intVar = host.newVar(lib.System.Int32);
37         found = dict.TryGetValue('foo', intVar.out);
38         Console.WriteLine('{0} {1}', found, intVar);
39     ");
40 
41     // create and populate a host array
42     engine.Execute(@"
43         numbers = host.newArr(lib.System.Int32, 20);
44         for (var i = 0; i < numbers.Length; i++) { numbers[i] = i; }
45         Console.WriteLine(lib.System.String.Join(', ', numbers));
46     ");
47 
48     // create a script delegate
49     engine.Execute(@"
50         Filter = lib.System.Func(lib.System.Int32, lib.System.Boolean);
51         oddFilter = new Filter(function(value) {
52             return (value & 1) ? true : false;
53         });
54     ");
55 
56     // use LINQ from script
57     engine.Execute(@"
58         oddNumbers = numbers.Where(oddFilter);
59         Console.WriteLine(lib.System.String.Join(', ', oddNumbers));
60     ");
61 
62     // use a dynamic host object
63     engine.Execute(@"
64         expando = new lib.System.Dynamic.ExpandoObject();
65         expando.foo = 123;
66         expando.bar = 'qux';
67         delete expando.foo;
68     ");
69 
70     // call a script function
71     engine.Execute("function print(x) { Console.WriteLine(x); }");
72     engine.Script.print(DateTime.Now.DayOfWeek);
73 
74     // examine a script object
75     engine.Execute("person = { name: 'Fred', age: 5 }");
76     Console.WriteLine(engine.Script.person.name);
77 }