c#動態編譯執行對象方法示例運用映射機制創建對象

2020-01-24 02:53:19

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來源：轉載

供稿：網友

C#是一種編譯型的語言，程序執行，首先要經過編譯器編譯，如何讓C#像一種腳本一樣，在要執行的時候，進行編譯，這里，我們可以用Microsoft.CSharp空間下的CSharpCodeProvider提供類，來達到動態編譯的效果。在這里，我新建一個控制臺程序，在Program.cs類里引用using System.CodeDom.Compiler;
using System.Reflection;using Microsoft.CSharp;三大命名空間

復制代碼代碼如下:

#region using directiry
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.CodeDom;
using System.CodeDom.Compiler;
using System.Reflection;
using Microsoft.CSharp;
#endregion
/*==============================================================================
*
* author:lichaoqiang@163.com
* link:http://my.oschina.net/lichaoqiang
*
*
* ============================================================================*/
namespace CodeDom
{
    class Program
    {
        #region 主程序入口
        /// <summary>
        ///主程序入口
        /// </summary>
        /// <param name="args"></param>
        static void Main(string[] args)
        {
            //1>實例化C#代碼服務提供對象
            CSharpCodeProvider provider = new CSharpCodeProvider();
            //2>聲明編譯器參數
            CompilerParameters parameters = new CompilerParameters();
            parameters.GenerateExecutable = false;
            parameters.GenerateInMemory = true;
            try
            {
                //3>動態編譯
                CompilerResults result = provider.CompileAssemblyFromSource(parameters, BuildCSharpCode());
                if (result.Errors.Count > 0)
                {
                    Console.Write("編譯出錯！");
                }
                //4>如果編譯沒有出錯，此刻已經生成動態程序集LCQ.LCQClass
                //5>開始玩C#映射
                Assembly assembly = result.CompiledAssembly;
                object obj = assembly.CreateInstance("LCQ.LCQClass");
                Type type = assembly.GetType("LCQ.LCQClass");
                //6>獲取對象方法
                MethodInfo method = type.GetMethod("Sum");
                object[] objParameters = new object[2] { 1, 5 };
                int iResult = Convert.ToInt32(method.Invoke(obj, objParameters));//喚醒對象，執行行為
                Console.Write(iResult);
                Console.Read();
            }
            catch (System.NotImplementedException ex)
            {
                Console.Write(ex.Message);
            }
            catch (System.ArgumentException ex)
            {
                Console.Write(ex.Message);
            }
            catch (Exception ex)
            {
                Console.Write(ex.Message);
            }
        }
        #endregion

        #region 生成代碼塊
        /// <summary>
        /// 生成代碼塊
        /// </summary>
        /// <returns></returns>
        private static string BuildCSharpCode()
        {
            string fileName = AppDomain.CurrentDomain.BaseDirectory.Replace("Debug", string.Empty).Replace("Release", string.Empty) + "CodeFile.cs";
            string strCodeDom = File.ReadAllText(fileName);
            return strCodeDom;
        }
        #endregion
    }
}