asp.net C#下如何获取动态代码的值代码

下面是调用(注意调用时特殊字符的转义)

    1 color coor = csharpcodevaluehelper<color>.getcodevalue("color.fromargb(100,100,100)");
    2
    3
    4 image img = csharpcodevaluehelper<image>.getcodevalue("image.fromfile("c:\tu.jpg")");

代码如下
  1 usingmicrosoft.csharp;
  2 usingsystem.reflection;
  3  using system.codedom.compiler;
  4
  5 public static class csharpcodevaluehelper<t>
  6     {
  7         /// <summary>
  8         /// 编译器实例
  9         /// </summary>
10         private static csharpcodeprovider csharpcodeprovider { get; set; }
11
12         /// <summary>
13         /// 编译器参数
14         /// </summary>
15         private static compilerparameters compilerparameters { get; set; }
16
17         /// <summary>
18         /// 构造函数
19         /// </summary>
20         static csharpcodevaluehelper()
21         {
22             csharpcodeprovider = new csharpcodeprovider();
23
24             compilerparameters = new compilerparameters();
25             compilerparameters.referencedassemblies.add("system.dll");
26             compilerparameters.referencedassemblies.add("system.data.dll");
27             compilerparameters.referencedassemblies.add("system.deployment.dll");
28             compilerparameters.referencedassemblies.add("system.drawing.dll");
29             compilerparameters.referencedassemblies.add("system.windows.forms.dll");
30             compilerparameters.referencedassemblies.add("system.xml.dll");
31             compilerparameters.generateexecutable = false;
32             compilerparameters.generateinmemory = true;
33         }
34
35         /// <summary>
36         /// 获取代码的值
37         /// </summary>
38         /// <param name="csharpcode">csharpcode代码</param>
39         /// <returns>动态csharpcode代码的值</returns>
40         public static t getcodevalue(string csharpcode)
41         {
42             compilerresults compilerresults = csharpcodeprovider.compileassemblyfromsource(compilerparameters, createcode(csharpcode));
43
44             if (compilerresults.errors.haserrors)
45             {
46                 string errorstring = string.empty;
47                 errorstring += "编译错误：n";
48                 foreach (compilererror err in compilerresults.errors)
49                 {
50                     errorstring += err.errortext + "n";
51                 }
52                 throw new exception(errorstring);
53             }
54             else
55             {
56                 // 通过反射，调用动态类dynamicclass实例
57                 assembly assembly = compilerresults.compiledassembly;
58                 object dynamicclass = assembly.createinstance("dynamicnamespace.dynamicclass");
59                 methodinfo methodinfo = dynamicclass.gettype().getmethod("getvalue");
60
61                 return (t)methodinfo.invoke(dynamicclass, null);
62             }
63         }
64
65         /// <summary>
66         /// 创建代码
67         /// </summary>
68         /// <param name="csharpcode">csharpcode代码</param>
69         /// <returns>创建完成的代码www.3ppt.com</returns>
70         private static string createcode(string csharpcode)
71         {
72             stringbuilder strbuilder = new stringbuilder();
73             strbuilder.appendline("using system;");
74             strbuilder.appendline("using system.collections.generic;");
75             strbuilder.appendline("using system.componentmodel;");
76             strbuilder.appendline("using system.data;");
77             strbuilder.appendline("using system.drawing;");
78             strbuilder.appendline("using system.text;");
79             strbuilder.appendline("using system.windows.forms;");
80
81             strbuilder.appendline("namespace dynamicnamespace");
82             strbuilder.appendline("{");
83             strbuilder.appendline("      public class dynamicclass");
84             strbuilder.appendline("      {");
85             strbuilder.appendline("          public object getvalue()");
86             strbuilder.appendline("          {");
87             strbuilder.appendline("               return " + csharpcode + ";");
88             strbuilder.appendline("          }");
89             strbuilder.appendline("      }");
90             strbuilder.appendline("}");
91
92             string code = strbuilder.tostring();
93             return code;
94         }
95     }