汤姆，

如果您将项目定位到".NET Framework 4"，是否可行?而不是".NET Framework 4客户端配置文件"?如果不起作用，建议您创建一个新项目，然后重试，或在此处发布示例代码.

Is it work if you target your project to ".NET Framework 4" instead of ".NET Framework 4 Client profile"? If doesn't work, I would suggest you create a new project and try again, or post your sample codes here.

谢谢