Override field name deserialization in ServiceStack

问题

I'm using ServiceStack to deserialize some HTML form values but can't figure out how to override the value that each field should be read from.

For example, the form posts a value to first_name but the property on my POCO is called FirstName. how would I do mapping like that in ServiceStack

回答1:

The ServiceStack Text serializers support [DataMember] aliases where you can use the Name parameter to specify what alias each field should be, e.g:

[DataContract]
public class Customer
{
    [DataMember(Name="first_name")]
    public string FirstName { get; set; }

    [DataMember(Name="last_name")]
    public string LastName { get; set; }
}

Note: Once you add [DataContract] / [DataMember] attributes to your DTOs then the behavior becomes opt-in and you will have add [DataMember] on each of the properties you want serialized.

Emitting idiomatic JSON for all DTOs

You can instruct JSON serialization to follow a different convention by specifying the following global settings:

//Emit {"firstName":"first","lastName":"last"}
JsConfig.Init(new Config { TextCase = TextCase.CamelCase });

//Emit {"first_name":"first","last_name":"last"}
JsConfig.Init(new Config { TextCase = TextCase.SnakeCase });

回答2:

In order to serialise C# class with underscore convention, you need to set JsConfig.EmitLowercaseUnderscoreNames to true as mythz said.

JsConfig.EmitLowercaseUnderscoreNames = true;

But, in my experience, Deserialising would fail, as it expect CamelCased values. To enable underscore json value deserialisation, you need to set JsConfig's PropertyConvention.

JsConfig.PropertyConvention = PropertyConvention.Lenient;

I use a simple helper method to resolve the serialisation and deserialisation issue.

public static class JsonHelpers
{
    public static string ToUnderscoredJson<T>(this T obj)
    {
        JsConfig.EmitLowercaseUnderscoreNames = true;

        return JsConfig.PreferInterfaces
            ? JsonSerializer.SerializeToString(obj, AssemblyUtils.MainInterface<T>())
            : JsonSerializer.SerializeToString(obj);
    }

    public static T FromUnderscoredJson<T>(this string json)
    {
        JsConfig.PropertyConvention = PropertyConvention.Lenient;
        return JsonSerializer.DeserializeFromString<T>(json);
    }
}

来源：https://stackoverflow.com/questions/10114044/override-field-name-deserialization-in-servicestack

标签

serialization

servicestack