今天写WCf 时遇到如下报错：
调试过程发现，各个过程都无异常，但是返回给调用端数据时出现如下错误。
Failed to invoke the service. Possible causes: The service is offline or inaccessible; the client-side configuration does not match the proxy; the existing proxy is invalid. Refer to the stack trace for more detail. You can try to recover by starting a new proxy, restoring to default configuration, or refreshing the service.
最后检查，导致此错误的原因是
[DataContract]
public class Student
{
[DataMember]
public int PersonId { get; }
[DataMember]
public string Name { get; set; }
}
改成如下就好了：
[DataContract]
public class Student
{
[DataMember]
public int PersonId { get;private set; }
[DataMember]
public string Name { get; set; }
}
wcf 服务序列化只读属性会出现问题，导致Failed to invoke the service.
WCF Failed to invoke the service. Possible causes: The service is offline or inaccessible
原文：http://www.cnblogs.com/hbb0b0/p/4514904.html