c# - CSharpCodeProvider 编译性能

Question

CompileAssemblyFromDom 是否比 CompileAssemblyFromSource 快？

它应该因为它可能会绕过编译器前端。

Answer 1

CompileAssemblyFromDom 编译成 .cs 文件，然后通过普通的 C# 编译器运行。

例子:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.CSharp;
using System.CodeDom;
using System.IO;
using System.CodeDom.Compiler;
using System.Reflection;

namespace CodeDomQuestion
{
    class Program
    {

        private static void Main(string[] args)
        {
            Program p = new Program();
            p.dotest("C:\\fs.exe");
        }

        public void dotest(string outputname)
        {
            CSharpCodeProvider cscProvider = new CSharpCodeProvider();
            CompilerParameters cp = new CompilerParameters();
            cp.MainClass = null;
            cp.GenerateExecutable = true;
            cp.OutputAssembly = outputname;
            
            CodeNamespace ns = new CodeNamespace("StackOverflowd");

            CodeTypeDeclaration type = new CodeTypeDeclaration();
            type.IsClass = true;
            type.Name = "MainClass";
            type.TypeAttributes = TypeAttributes.Public;
            
            ns.Types.Add(type);

            CodeMemberMethod cmm = new CodeMemberMethod();
            cmm.Attributes = MemberAttributes.Static;
            cmm.Name = "Main";
            cmm.Statements.Add(new CodeSnippetExpression("System.Console.WriteLine('f'zxcvv)"));
            type.Members.Add(cmm);

            CodeCompileUnit ccu = new CodeCompileUnit();
            ccu.Namespaces.Add(ns);

            CompilerResults results = cscProvider.CompileAssemblyFromDom(cp, ccu);

            foreach (CompilerError err in results.Errors)
                Console.WriteLine(err.ErrorText + " - " + err.FileName + ":" + err.Line);

            Console.WriteLine();
        }
    }
}

它显示了一个(现在不存在的)临时文件中的错误:

) expected - c:\Documents and Settings\jacob\Local Settings\Temp\x59n9yb-.0.cs:17

; expected - c:\Documents and Settings\jacob\Local Settings\Temp\x59n9yb-.0.cs:17

Invalid expression term ')' - c:\Documents and Settings\jacob\Local Settings\Tem p\x59n9yb-.0.cs:17

所以我猜答案是否定的