Question

我已经读过几个关于编制动态C#代码的SO员额。例如,。该员额。我理解,可以采取几种方式。

然而,称呼该法典的援引人进展缓慢。我只是一个简单的基准,它比使用本土方法要低大约500X。

我希望能够做的是,相当于装上一部《刑法》,并直接(以“名义”方式)要求采用一种方法,这将给我所希望的速度带来好处。

实现这一目标的最容易的方法是什么? • 将动态守则编成堆,然后装上它? 能否记住?

http://www.ohchr.org。

我不关心汇编时间。只有执行。

<EDIT 2, 3

我写道:

    public static int Execute(int i) { return i * 2; }

    private void button30_Click(object sender, EventArgs e)
    {
        CSharpCodeProvider foo = new CSharpCodeProvider();

        var res = foo.CompileAssemblyFromSource(
            new System.CodeDom.Compiler.CompilerParameters()
            {
                GenerateInMemory = true,
                CompilerOptions = @"/optimize",                    
            },
            @"public class FooClass { public static int Execute(int i) { return i * 2; }}"
        );

        var type = res.CompiledAssembly.GetType("FooClass");
        var obj = Activator.CreateInstance(type);
        var method = type.GetMethod("Execute");
        int i = 0, t1 = Environment.TickCount, t2;
        //var input = new object[] { 2 };

        //for (int j = 0; j < 10000000; j++)
        //{
        //    input[0] = j;
        //    var output = method.Invoke(obj, input);
        //    i = (int)output;
        //}

        //t2 = Environment.TickCount;

        //MessageBox.Show((t2 - t1).ToString() + Environment.NewLine + i.ToString());

        t1 = Environment.TickCount;

        for (int j = 0; j < 100000000; j++)
        {
            i = Execute(j);
        }

        t2 = Environment.TickCount;

        MessageBox.Show("Native: " + (t2 - t1).ToString() + Environment.NewLine + i.ToString());

        var func = (Func<int, int>) Delegate.CreateDelegate(typeof (Func<int, int>), method);

        t1 = Environment.TickCount;

        for (int j = 0; j < 100000000; j++)
        {
            i = func(j);
        }

        t2 = Environment.TickCount;

        MessageBox.Show("Dynamic delegate: " + (t2 - t1).ToString() + Environment.NewLine + i.ToString());

        Func<int, int> funcL = Execute;

        t1 = Environment.TickCount;

        for (int j = 0; j < 100000000; j++)
        {
            i = funcL(j);
        }

        t2 = Environment.TickCount;

        MessageBox.Show("Delegate: " + (t2 - t1).ToString() + Environment.NewLine + i.ToString());
    }

Answer 1

是的,如果你通过<代码>MethodInfo或非特有<代码>Delegate援引,那么,这确实是缓慢的。 trick:don t do that。各种办法:

具体方法,通过基本但型代表,例如Action,或作为通用捕获-all,Func<object[], Object>-和使用Delegate.CreateDelegate,以创建型代表:>
```
Action doSomething = (Action)Delegate.CreateDelegate(typeof(Action), method);
```
another variant of this is to use the Expression API (which has a .Compile() method), or DynamicMethod (which has CreateDelegate()). The key thing: you must get a typed delegate and invoke using typed invoke (not .DynamicInvoke).
更复杂的情况是,你正在产生整个类型,考虑采用你知道的接口,即:
```
IFoo foo = (IFoo)Activator.CreateInstance(...);
```
again; after the initial cast (which is very cheap) you can just use static code:
```
foo.Bar();
```

http://www.ohchr.org。

Answer 2

除了马克建议外,你还可以通过具体说明“优化”汇编者选择:

var res = foo.CompileAssemblyFromSource(
        new System.CodeDom.Compiler.CompilerParameters()
        {
            GenerateInMemory = true,
            CompilerOptions = "/optimize"
        },

Answer 3

值得一提的是,所有可能的选择及其业绩特点如何看待。鉴于以下助手班和职能:

public void Test(Func<int> func)
{        
    var watch = new Stopwatch();
    watch.Start();
    for (var i = 0; i <= 1000000; i++)
    {
        var test = func();
    }
    Console.WriteLine(watch.ElapsedMilliseconds);
}

public class FooClass { public int Execute() { return 1;}}

设立和执行:

using (Microsoft.CSharp.CSharpCodeProvider foo = 
       new Microsoft.CSharp.CSharpCodeProvider())
{
    var res = foo.CompileAssemblyFromSource(
        new System.CodeDom.Compiler.CompilerParameters() 
        {  
            GenerateInMemory = true 
        }, 
        "public class FooClass { public int Execute() { return 1;}}"
    );

    var real = new FooClass();
    Test(() => real.Execute());                   // benchmark, direct call

    var type = res.CompiledAssembly.GetType("FooClass");
    var obj = Activator.CreateInstance(type);    
    var method = type.GetMethod("Execute");
    var input = new object[] { };                
    Test(() => (int)method.Invoke(obj, input));   // reflection invoke  

    dynamic dyn = Activator.CreateInstance(type);  
    Test(() => dyn.Execute());                    // dynamic object invoke

    var action = (Func<int>)Delegate.CreateDelegate(typeof(Func<int>), null, method); 
    Test(() => action());                         // delegate
}

结果是:

8     // direct
771   // reflection invoke
41    // dynamic object invoke
7     // delegate

因此,在你可以不使用代表的情况下(如果你不了解多少),你可以尝试<条码>。

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