编译C#代码

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");
}
}
}

转载于:https://www.cnblogs.com/babietongtianta/p/6145624.html

• 点赞
• 收藏
• 分享
• 文章举报