c# - 将扩展方法限制为仅针对 EF 实体

Question

我制作了一个扩展方法，用于从 EF 实体制作可序列化的字典:

public static class Extensions
{
    public static IDictionary<string, object> ToSerializable(this object obj)
    {
        var result = new Dictionary<string, object>();

        foreach (var property in obj.GetType().GetProperties().ToList())
        {
            var value = property.GetValue(obj, null);

            if (value != null && (value.GetType().IsPrimitive 
                  || value is decimal || value is string || value is DateTime 
                  || value is List<object>))
            {
                result.Add(property.Name, value);
            }
        }

        return result;
    }
}

我是这样使用它的:

using(MyDbContext context = new MyDbContext())
{
    var someEntity = context.SomeEntity.FirstOrDefault();
    var serializableEntity = someEntity.ToSerializable();
}

我想知道是否有任何方法可以将其限制为仅在我的实体上可用，而不是在所有 object:s 上可用。

Answer 1

Patryk 的答案代码:

public interface ISerializableEntity { };

public class CustomerEntity : ISerializableEntity
{
    ....
}

public static class Extensions
{
    public static IDictionary<string, object> ToSerializable(
        this ISerializableEntity obj)
    {
        var result = new Dictionary<string, object>();

        foreach (var property in obj.GetType().GetProperties().ToList())
        {
            var value = property.GetValue(obj, null);

            if (value != null && (value.GetType().IsPrimitive 
                  || value is decimal || value is string || value is DateTime 
                  || value is List<object>))
            {
                result.Add(property.Name, value);
            }
        }

        return result;
    }
}

看到此代码如何与标记接口(interface)一起工作，您可以选择将序列化方法放在接口(interface)中以避免反射，并更好地控制序列化的内容以及编码或加密的方式:

public interface ISerializableEntity 
{
    Dictionary<string, object> ToDictionary();
};

public class CustomerEntity : ISerializableEntity
{
    public string CustomerName { get; set; }
    public string CustomerPrivateData { get; set; }
    public object DoNotSerializeCustomerData { get; set; }

    Dictionary<string, object> ISerializableEntity.ToDictionary()
    {
        var result = new Dictionary<string, object>();
        result.Add("CustomerName", CustomerName);

        var encryptedPrivateData = // Encrypt the string data here
        result.Add("EncryptedCustomerPrivateData", encryptedPrivateData);
    }

    return result;
}