Question

不确定这里有什么问题，但我试图在我创建的界面中使用枚举。

当我尝试实现界面时，我收到错误

可访问性不一致：属性类型'System.Collections.Generic.IList'的可访问性低于属性'BusinessEntities.ICloneMessage.AgentAddresses'

枚举

namespace BusinessEntities
{
    public class AddressTypeValues
    {
        [DataContract(Name = "AddressType")]
        public enum AddressType
        {
            [EnumMember(Value = "Home")]
            Home,
            [EnumMember(Value = "Mailing")]
            Mailing,
            [EnumMember(Value = "Location")]
            Location,
            [EnumMember(Value = "Other")]
            Other
        }
    }
}

接口

namespace BusinessEntities
{
    public interface IAgentAddress
    {
        AddressTypeValues.AddressType AddressType { get; set; }
        String? Street1 { get; set; }
        String? Street2 { get; set; }
        String? Street3 { get; set; }
        String? City { get; set; }
        String? State { get; set; }
        String? ZipCode { get; set; }
    }
}

使用AddresType的类

namespace BusinessEntities
{
    [DataContract]
    public class CloneMessage : ICloneMessage
    {
        [DataMember]
        public AgentTransmission AgentInformation { get; set; }
        [DataMember]
        public IList<AgentAddress> AgentAddresses { get; set; }
        [DataMember]
        public IList<RelationshipCode> RelationshipCodes { get; set; }
        [DataMember]
        public string? ErrorMessages { get; set; }
        public CloneMessage(){}
    }
}
namespace BusinessEntities
{
    [DataContract]
    public class AgentAddress : IAgentAddress
    {
        [DataMember]
        public AddressTypeValues.AddressType AddressType { get; set; }
        [DataMember]
        public string Street1 { get; set; }
        [DataMember]
        public string Street2 { get; set; }
        [DataMember]
        public string Street3 { get; set; }
        [DataMember]
        public string City { get; set; }
        [DataMember]
        public string State { get; set; }
        [DataMember]
        public string ZipCode { get; set; }
    }
}

Answer 1

您的代码中有几处错误。

首先。您的班级AgentAddress未标记为public。这就是你得到错误的原因。可能您的类没有使用任何访问说明符定义，它被视为internal。使您的班级public删除错误。

代码中的第二个问题是您正在使用String?。可能正在尝试将字符串设为Nullable<T>。 String已经是引用类型，它可以保留为null。您需要使用?删除String?。所以你的界面看起来像是：

public interface IAgentAddress
{
    AddressTypeValues.AddressType AddressType { get; set; }
    String Street1 { get; set; }
    String Street2 { get; set; }
    String Street3 { get; set; }
    String City { get; set; }
    String State { get; set; }
    String ZipCode { get; set; }
}

Nullable<T>或带有?的类型用于值类型，因为值类型无法保持null或int?

Nullable<int>

可访问性不一致：类中的属性类型比Interface中的属性类型更难访问

1 个答案: