编译C#代码
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 | using Microsoft.CSharp; using System.CodeDom.Compiler; using System.Reflection; using System.Text; namespace System { public static class CompileCSCAtRuntime { public static void HelloWorld() { string code = @" using System; namespace First { public class Program { public static void Main() { " + "Console.WriteLine(\"Hello, world!\");" + @" } } } " ; CSharpCodeProvider provider = new CSharpCodeProvider(); CompilerParameters parameters = new CompilerParameters(); // Reference to System.Drawing library parameters.ReferencedAssemblies.Add( "System.Drawing.dll" ); // True - memory generation, false - external file generation parameters.GenerateInMemory = true ; // True - exe file generation, false - dll file generation parameters.GenerateExecutable = true ; CompilerResults results = provider.CompileAssemblyFromSource(parameters, code); if (results.Errors.HasErrors) { StringBuilder sb = new StringBuilder(); foreach (CompilerError error in results.Errors) { sb.AppendLine(String.Format( "Error ({0}): {1}" , error.ErrorNumber, error.ErrorText)); } throw new InvalidOperationException(sb.ToString()); } Assembly assembly = results.CompiledAssembly; Type program = assembly.GetType( "First.Program" ); MethodInfo main = program.GetMethod( "Main" ); main.Invoke( null , null ); } public static void TestMeothds() { MethodInfo function = CreateFunction( "x + 2 * y" ); var betterFunction = (Func< double , double , double >)Delegate.CreateDelegate( typeof (Func< double , double , double >), function); Func< double , double , double > lambda = (x, y) => x + 2 * y; DateTime start; DateTime stop; double result; int repetitions = 5000000; start = DateTime.Now; for ( int i = 0; i < repetitions; i++) { result = OriginalFunction(2, 3); } stop = DateTime.Now; Console.WriteLine( "Original - time: {0} ms" , (stop - start).TotalMilliseconds); start = DateTime.Now; for ( int i = 0; i < repetitions; i++) { result = ( double )function.Invoke( null , new object [] { 2, 3 }); } stop = DateTime.Now; Console.WriteLine( "Reflection - time: {0} ms" , (stop - start).TotalMilliseconds); start = DateTime.Now; for ( int i = 0; i < repetitions; i++) { result = betterFunction(2, 3); } stop = DateTime.Now; Console.WriteLine( "Delegate - time: {0} ms" , (stop - start).TotalMilliseconds); start = DateTime.Now; for ( int i = 0; i < repetitions; i++) { result = lambda(2, 3); } stop = DateTime.Now; Console.WriteLine( "Lambda - time: {0} ms" , (stop - start).TotalMilliseconds); } public static double OriginalFunction( double x, double y) { return x + 2 * y; } public static MethodInfo CreateFunction( string function) { string code = @" using System; namespace UserFunctions { public class BinaryFunction { public static double Function(double x, double y) { return func_xy; } } } " ; string finalCode = code.Replace( "func_xy" , function); CSharpCodeProvider provider = new CSharpCodeProvider(); CompilerResults results = provider.CompileAssemblyFromSource( new CompilerParameters(), finalCode); Type binaryFunction = results.CompiledAssembly.GetType( "UserFunctions.BinaryFunction" ); return binaryFunction.GetMethod( "Function" ); } } } |
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