将字符串转换为可执行代码性能

Question

我正在寻找将字符串转换为可执行代码的解决方案.我的代码非常慢,并执行4.7 seconds.有没有更快的方法呢？

字符串:"5*5"

产量:25

代码:

class Program {

    static void Main(string[] args) {
        var value = "5 * 5";
        Stopwatch sw = new Stopwatch();
        sw.Start();
        var test = Execute(value);
        sw.Stop();
        Debug.WriteLine($"Execute string at: {sw.Elapsed}");
    }

    private static object Execute(string content) {
        var codeProvider = new CSharpCodeProvider();
        var compilerParameters = new CompilerParameters {
            GenerateExecutable = false,
            GenerateInMemory = true
        };

        compilerParameters.ReferencedAssemblies.Add("system.dll");

        string sourceCode = CreateExecuteMethodTemplate(content);
        CompilerResults compilerResults = codeProvider.CompileAssemblyFromSource(compilerParameters, sourceCode);
        Assembly assembly = compilerResults.CompiledAssembly;
        Type type = assembly.GetType("Lab.Cal");
        MethodInfo methodInfo = type.GetMethod("Execute");

        return methodInfo.Invoke(null, null);
    }

    private static string CreateExecuteMethodTemplate(string content) {
        var builder = new StringBuilder();

        builder.Append("using System;");
        builder.Append("\r\nnamespace Lab");
        builder.Append("\r\n{");
        builder.Append("\r\npublic sealed class Cal");
        builder.Append("\r\n{");
        builder.Append("\r\npublic static object Execute()");
        builder.Append("\r\n{");
        builder.AppendFormat("\r\nreturn {0};", content);
        builder.Append("\r\n}");
        builder.Append("\r\n}");
        builder.Append("\r\n}");

        return builder.ToString();
    }
}

Answer 1

好吧,有一个更简单的黑客:

var _Result = new DataTable().Compute("5*5"); // _Result = 25
var _Result2 = new DataTable().Compute("5+5*5"); // _Result2 = 30

它还有更多选择.请查看文档.