[英]How to handle deserialization of empty string into enum in json.net
我將json屬性反序列化為枚舉,但是當屬性為空字符串時,我遇到了處理案例的問題。
將值“”轉換為“EnrollmentState”類型時出錯
我正在嘗試反序列化requiredItem
的state
屬性。
{
"currentStage" : "Pre-Approved",
"stages" : ["Applicant", "Pre-Approved", "Approved", "Enrolled"],
"requiredItems" : [{
"id" : 1,
"name" : "Documents",
"state" : ""
}, {
"id" : 2,
"name" : "Eligibility Verification",
"state" : "complete"
}, {
"id" : 3,
"name" : "Placement Information",
"state" : "incomplete"
}
]
}
RequiredItem
類和枚舉...
public class RequiredItem {
/// <summary>
/// Gets or sets the identifier.
/// </summary>
/// <value>The identifier.</value>
public string id { get; set; }
/// <summary>
/// Gets or sets the name.
/// </summary>
/// <value>The name.</value>
public string name { get; set; }
/// <summary>
/// Gets or sets the status.
/// </summary>
/// <value>The status.</value>
[JsonProperty(ItemConverterType = typeof(StringEnumConverter))]
public EnrollmentState state { get; set; }
}
[JsonConverter(typeof(StringEnumConverter))]
public enum EnrollmentState {
[EnumMember(Value = "incomplete")]
Incomplete,
[EnumMember(Value = "actionNeeded")]
ActionNeeded,
[EnumMember(Value = "complete")]
Complete
}
如何為反序列化設置默認值,以便將空字符串反序列化為EnrollmentState.Incomplete
而不是拋出運行時錯誤?
如果需要,您需要實現自定義StringEnumConverter
:
public class EnrollmentStateEnumConverter : StringEnumConverter
{
public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
if (string.IsNullOrEmpty(reader.Value.ToString()))
return EnrollmentState.Incomplete;
return base.ReadJson(reader, objectType, existingValue, serializer);
}
}
[JsonConverter(typeof(EnrollmentStateEnumConverter))]
public enum EnrollmentState
{
[EnumMember(Value = "incomplete")]
Incomplete,
[EnumMember(Value = "actionNeeded")]
ActionNeeded,
[EnumMember(Value = "complete")]
Complete
}
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