我有以下JSON字符串，这是从外部收到的。
{
"team":[
{
"v1":"",
"attributes":{
"eighty_min_score":"",
"home_or_away":"home",
"score":"22",
"team_id":"500"
}
},
{
"v1":"",
"attributes":{
"eighty_min_score":"",
"home_or_away":"away",
"score":"30",
"team_id":"600"
}
}
]
}
我的映射类:
public class Attributes
{
public string eighty_min_score { get; set; }
public string home_or_away { get; set; }
public string score { get; set; }
public string team_id { get; set; }
}
public class Team
{
public string v1 { get; set; }
public Attributes attributes { get; set; }
}
public class RootObject
{
public List<Team> team { get; set; }
}
问题是我不喜欢Team类中的Attributes类名和属性字段名。相反，我希望它被命名为TeamScore，并从字段名称中删除_并给出正确的名称。
JsonConvert.DeserializeObject<RootObject>(jsonText);
我可以将Attributes重命名为TeamScore，但是如果我更改字段名称(Team类中的属性)，它将不能正确地反序列化并返回null。我怎样才能克服这个问题呢?
如果您希望使用动态映射，并且不想让属性使您的模型变得混乱，那么这种方法对我来说是可行的
用法:
var settings = new JsonSerializerSettings();
settings.DateFormatString = "YYYY-MM-DD";
settings.ContractResolver = new CustomContractResolver();
this.DataContext = JsonConvert.DeserializeObject<CountResponse>(jsonString, settings);
逻辑:
public class CustomContractResolver : DefaultContractResolver
{
private Dictionary<string, string> PropertyMappings { get; set; }
public CustomContractResolver()
{
this.PropertyMappings = new Dictionary<string, string>
{
{"Meta", "meta"},
{"LastUpdated", "last_updated"},
{"Disclaimer", "disclaimer"},
{"License", "license"},
{"CountResults", "results"},
{"Term", "term"},
{"Count", "count"},
};
}
protected override string ResolvePropertyName(string propertyName)
{
string resolvedName = null;
var resolved = this.PropertyMappings.TryGetValue(propertyName, out resolvedName);
return (resolved) ? resolvedName : base.ResolvePropertyName(propertyName);
}
}
添加到杰克的解决方案。我需要使用JsonProperty和Serialize来反序列化，同时忽略JsonProperty(反之亦然)。ReflectionHelper和Attribute Helper只是获取属性列表或属性的Helper类。如果有人关心的话，我可以加上。使用下面的例子，你可以序列化视图模型并获得“Amount”，即使JsonProperty是“RecurringPrice”。
/// <summary>
/// Ignore the Json Property attribute. This is usefule when you want to serialize or deserialize differently and not
/// let the JsonProperty control everything.
/// </summary>
/// <typeparam name="T"></typeparam>
public class IgnoreJsonPropertyResolver<T> : DefaultContractResolver
{
private Dictionary<string, string> PropertyMappings { get; set; }
public IgnoreJsonPropertyResolver()
{
this.PropertyMappings = new Dictionary<string, string>();
var properties = ReflectionHelper<T>.GetGetProperties(false)();
foreach (var propertyInfo in properties)
{
var jsonProperty = AttributeHelper.GetAttribute<JsonPropertyAttribute>(propertyInfo);
if (jsonProperty != null)
{
PropertyMappings.Add(jsonProperty.PropertyName, propertyInfo.Name);
}
}
}
protected override string ResolvePropertyName(string propertyName)
{
string resolvedName = null;
var resolved = this.PropertyMappings.TryGetValue(propertyName, out resolvedName);
return (resolved) ? resolvedName : base.ResolvePropertyName(propertyName);
}
}
用法:
var settings = new JsonSerializerSettings();
settings.DateFormatString = "YYYY-MM-DD";
settings.ContractResolver = new IgnoreJsonPropertyResolver<PlanViewModel>();
var model = new PlanViewModel() {Amount = 100};
var strModel = JsonConvert.SerializeObject(model,settings);
模型:
public class PlanViewModel
{
/// <summary>
/// The customer is charged an amount over an interval for the subscription.
/// </summary>
[JsonProperty(PropertyName = "RecurringPrice")]
public double Amount { get; set; }
/// <summary>
/// Indicates the number of intervals between each billing. If interval=2, the customer would be billed every two
/// months or years depending on the value for interval_unit.
/// </summary>
public int Interval { get; set; } = 1;
/// <summary>
/// Number of free trial days that can be granted when a customer is subscribed to this plan.
/// </summary>
public int TrialPeriod { get; set; } = 30;
/// <summary>
/// This indicates a one-time fee charged upfront while creating a subscription for this plan.
/// </summary>
[JsonProperty(PropertyName = "SetupFee")]
public double SetupAmount { get; set; } = 0;
/// <summary>
/// String representing the type id, usually a lookup value, for the record.
/// </summary>
[JsonProperty(PropertyName = "TypeId")]
public string Type { get; set; }
/// <summary>
/// Billing Frequency
/// </summary>
[JsonProperty(PropertyName = "BillingFrequency")]
public string Period { get; set; }
/// <summary>
/// String representing the type id, usually a lookup value, for the record.
/// </summary>
[JsonProperty(PropertyName = "PlanUseType")]
public string Purpose { get; set; }
}
扩展Rentering.com的答案，在需要处理许多类型的整个图的情况下，并且您正在寻找一个强类型的解决方案，这个类可以提供帮助，参见下面的用法(fluent)。它以每种类型的黑名单或白名单的方式运行。类型不能两者兼有(Gist -还包含全局忽略列表)。
public class PropertyFilterResolver : DefaultContractResolver
{
const string _Err = "A type can be either in the include list or the ignore list.";
Dictionary<Type, IEnumerable<string>> _IgnorePropertiesMap = new Dictionary<Type, IEnumerable<string>>();
Dictionary<Type, IEnumerable<string>> _IncludePropertiesMap = new Dictionary<Type, IEnumerable<string>>();
public PropertyFilterResolver SetIgnoredProperties<T>(params Expression<Func<T, object>>[] propertyAccessors)
{
if (propertyAccessors == null) return this;
if (_IncludePropertiesMap.ContainsKey(typeof(T))) throw new ArgumentException(_Err);
var properties = propertyAccessors.Select(GetPropertyName);
_IgnorePropertiesMap[typeof(T)] = properties.ToArray();
return this;
}
public PropertyFilterResolver SetIncludedProperties<T>(params Expression<Func<T, object>>[] propertyAccessors)
{
if (propertyAccessors == null)
return this;
if (_IgnorePropertiesMap.ContainsKey(typeof(T))) throw new ArgumentException(_Err);
var properties = propertyAccessors.Select(GetPropertyName);
_IncludePropertiesMap[typeof(T)] = properties.ToArray();
return this;
}
protected override IList<JsonProperty> CreateProperties(Type type, MemberSerialization memberSerialization)
{
var properties = base.CreateProperties(type, memberSerialization);
var isIgnoreList = _IgnorePropertiesMap.TryGetValue(type, out IEnumerable<string> map);
if (!isIgnoreList && !_IncludePropertiesMap.TryGetValue(type, out map))
return properties;
Func<JsonProperty, bool> predicate = jp => map.Contains(jp.PropertyName) == !isIgnoreList;
return properties.Where(predicate).ToArray();
}
string GetPropertyName<TSource, TProperty>(
Expression<Func<TSource, TProperty>> propertyLambda)
{
if (!(propertyLambda.Body is MemberExpression member))
throw new ArgumentException($"Expression '{propertyLambda}' refers to a method, not a property.");
if (!(member.Member is PropertyInfo propInfo))
throw new ArgumentException($"Expression '{propertyLambda}' refers to a field, not a property.");
var type = typeof(TSource);
if (!type.GetTypeInfo().IsAssignableFrom(propInfo.DeclaringType.GetTypeInfo()))
throw new ArgumentException($"Expresion '{propertyLambda}' refers to a property that is not from type '{type}'.");
return propInfo.Name;
}
}
用法:
var resolver = new PropertyFilterResolver()
.SetIncludedProperties<User>(
u => u.Id,
u => u.UnitId)
.SetIgnoredProperties<Person>(
r => r.Responders)
.SetIncludedProperties<Blog>(
b => b.Id)
.Ignore(nameof(IChangeTracking.IsChanged)); //see gist
我在序列化时使用JsonProperty属性，但在使用这个ContractResolver反序列化时忽略它们:
public class IgnoreJsonPropertyContractResolver: DefaultContractResolver
{
protected override IList<JsonProperty> CreateProperties(Type type, MemberSerialization memberSerialization)
{
var properties = base.CreateProperties(type, memberSerialization);
foreach (var p in properties) { p.PropertyName = p.UnderlyingName; }
return properties;
}
}
ContractResolver只是将每个属性设置回类属性名(从Shimmy的解决方案简化)。用法:
var airplane= JsonConvert.DeserializeObject<Airplane>(json,
new JsonSerializerSettings { ContractResolver = new IgnoreJsonPropertyContractResolver() });
