WCF Failed to invoke the service. Possible causes:

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

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