为什么这段代码无法编译?

问题描述

大家好，

谁能解释为什么以下代码无法编译?

Hi Everyone,

Can any one explain why the following code doesn''t compile?

int a = 7;
int b = 5;

dynamic oa = a;
dynamic ob = b;

int c = oa - ob;

在此先感谢您.

Thanks in advance.

推荐答案

using System;

namespace ConsoleTester
    {
    class Program
        {
        static void Main(string[] args)
            {
            int a = 7;
            int b = 5;

            dynamic oa = a;
            dynamic ob = b;

            int c = oa - ob;
            Console.WriteLine(c);
            }
        }
    }

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace SimpleTestCS
{
    class Program
    {
        static void Main(string[] args)
        {
            int a = 7;
            int b = 5;
            dynamic oa = a;
            dynamic ob = b;
            int c = oa - ob;
            Console.WriteLine(c);
        }
    }
}

因此，打开您的项目属性，并检查您是否正在为.Net 4运行时进行构建

问候
Espen Harlinn

So open your project properties and check that you are building for the .Net 4 runtime

Regards
Espen Harlinn

int a = 7;
int b = 5;
dynamic oa = (dynamic)a;
dynamic ob = (dynamic)b;
int c = oa - ob;

如果需要，请在此处查看.< ^ ]更加清晰.

更新:
1.如OriginalGriff所说，如果您使用.NET Framework 4.0，您的代码将可以正常工作
2.基于错误，显然动态不被视为关键字，因此错误
3.查找缺少的参考.可能您未使用.NET Framework 4.0，在此它是动态关键字.

If needed, look here[^] for more clarity.

UPDATE:
1. As already said by OriginalGriff, your code would work fine if you have .NET framework 4.0
2. Based on the error, it''s clear dynamic is not being considered as a keyword and hence an error
3. Look for the missing reference. Probably you are not using .NET framework 4.0, which would be needed here for dynamic keyword.

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