Estoy de acuerdo con Avner Shahar-Kashtan. No debe hacer esto, especialmente si no tiene control sobre el JSON.
Dicho esto, se puede hacer con el uso de un ExpandoObject y un ExpandoObjectConverter personalizado. JSON.NET ya proporciona un ExpandoObjectConverter por lo que con algunos pequeños ajustes tiene lo que desea.
Observe // CAMBIÓ comentarios dentro del fragmento de código para mostrarle dónde lo cambié.
public class CamelCaseToPascalCaseExpandoObjectConverter : JsonConverter
{
//CHANGED
//the ExpandoObjectConverter needs this internal method so we have to copy it
//from JsonReader.cs
internal static bool IsPrimitiveToken(JsonToken token)
{
switch (token)
{
case JsonToken.Integer:
case JsonToken.Float:
case JsonToken.String:
case JsonToken.Boolean:
case JsonToken.Null:
case JsonToken.Undefined:
case JsonToken.Date:
case JsonToken.Bytes:
return true;
default:
return false;
}
}
/// <summary>
/// Writes the JSON representation of the object.
/// </summary>
/// <param name="writer">The <see cref="JsonWriter"/> to write to.</param>
/// <param name="value">The value.</param>
/// <param name="serializer">The calling serializer.</param>
public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
{
// can write is set to false
}
/// <summary>
/// Reads the JSON representation of the object.
/// </summary>
/// <param name="reader">The <see cref="JsonReader"/> to read from.</param>
/// <param name="objectType">Type of the object.</param>
/// <param name="existingValue">The existing value of object being read.</param>
/// <param name="serializer">The calling serializer.</param>
/// <returns>The object value.</returns>
public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
return ReadValue(reader);
}
private object ReadValue(JsonReader reader)
{
while (reader.TokenType == JsonToken.Comment)
{
if (!reader.Read())
throw new Exception("Unexpected end.");
}
switch (reader.TokenType)
{
case JsonToken.StartObject:
return ReadObject(reader);
case JsonToken.StartArray:
return ReadList(reader);
default:
//CHANGED
//call to static method declared inside this class
if (IsPrimitiveToken(reader.TokenType))
return reader.Value;
//CHANGED
//Use string.format instead of some util function declared inside JSON.NET
throw new Exception(string.Format(CultureInfo.InvariantCulture, "Unexpected token when converting ExpandoObject: {0}", reader.TokenType));
}
}
private object ReadList(JsonReader reader)
{
IList<object> list = new List<object>();
while (reader.Read())
{
switch (reader.TokenType)
{
case JsonToken.Comment:
break;
default:
object v = ReadValue(reader);
list.Add(v);
break;
case JsonToken.EndArray:
return list;
}
}
throw new Exception("Unexpected end.");
}
private object ReadObject(JsonReader reader)
{
IDictionary<string, object> expandoObject = new ExpandoObject();
while (reader.Read())
{
switch (reader.TokenType)
{
case JsonToken.PropertyName:
//CHANGED
//added call to ToPascalCase extension method
string propertyName = reader.Value.ToString().ToPascalCase();
if (!reader.Read())
throw new Exception("Unexpected end.");
object v = ReadValue(reader);
expandoObject[propertyName] = v;
break;
case JsonToken.Comment:
break;
case JsonToken.EndObject:
return expandoObject;
}
}
throw new Exception("Unexpected end.");
}
/// <summary>
/// Determines whether this instance can convert the specified object type.
/// </summary>
/// <param name="objectType">Type of the object.</param>
/// <returns>
/// <c>true</c> if this instance can convert the specified object type; otherwise, <c>false</c>.
/// </returns>
public override bool CanConvert(Type objectType)
{
return (objectType == typeof (ExpandoObject));
}
/// <summary>
/// Gets a value indicating whether this <see cref="JsonConverter"/> can write JSON.
/// </summary>
/// <value>
/// <c>true</c> if this <see cref="JsonConverter"/> can write JSON; otherwise, <c>false</c>.
/// </value>
public override bool CanWrite
{
get { return false; }
}
}
Una cadena simple para el convertidor de Pascal Case. Hazlo más inteligente si lo necesitas.
public static class StringExtensions
{
public static string ToPascalCase(this string s)
{
if (string.IsNullOrEmpty(s) || !char.IsLower(s[0]))
return s;
string str = char.ToUpper(s[0], CultureInfo.InvariantCulture).ToString((IFormatProvider)CultureInfo.InvariantCulture);
if (s.Length > 1)
str = str + s.Substring(1);
return str;
}
}
Ahora puede usarlo así.
var settings = new JsonSerializerSettings()
{
ContractResolver = new CamelCasePropertyNamesContractResolver(),
Converters = new List<JsonConverter> { new CamelCaseToPascalCaseExpandoObjectConverter() }
};
var json = "{\"someProperty\":\"some value\"}";
dynamic deserialized = JsonConvert.DeserializeObject<ExpandoObject>(json, settings);
Console.WriteLine(deserialized.SomeProperty); //some value
var json2 = JsonConvert.SerializeObject(deserialized, Formatting.None, settings);
Console.WriteLine(json == json2); //true
El ContractResolverCamelCasePropertyNamesContractResolver se utiliza cuando serializar el objeto de vuelta a JSON y lo hace caso Camel de nuevo. Esto también lo proporciona JSON.NET. Si no necesitas esto, puedes omitirlo.
Gracias! Sin embargo, no tengo control sobre el JSON, así que no es posible. – dillenmeister