Json.NET MissingMemberHandling setting

Json.NET MissingMemberHandling setting

The MissingMemberHandling setting in Json.NET specifies how the serializer should handle missing members when deserializing JSON into a .NET object.

There are three possible values for MissingMemberHandling:

  1. Ignore - This option tells Json.NET to ignore missing members when deserializing JSON into a .NET object. Any missing members will be ignored and not set on the object.

  2. Error - This option tells Json.NET to throw an exception if it encounters a missing member when deserializing JSON into a .NET object.

  3. UseDefaultVaues - This option tells Json.NET to set missing members to their default values when deserializing JSON into a .NET object.

You can set the MissingMemberHandling property on the JsonSerializerSettings object and then pass this object to the DeserializeObject method when deserializing JSON into a .NET object. Here's an example:

using Newtonsoft.Json; // Define the class to deserialize into public class Person { public string FirstName { get; set; } public string LastName { get; set; } } // Create the JSON string string json = "{\"FirstName\":\"John\",\"Age\":30}"; // Set the MissingMemberHandling property to Ignore JsonSerializerSettings settings = new JsonSerializerSettings { MissingMemberHandling = MissingMemberHandling.Ignore }; // Deserialize the JSON into a Person object using the JsonSerializerSettings Person person = JsonConvert.DeserializeObject<Person>(json, settings); // Display the properties of the Person object Console.WriteLine("First Name: {0}", person.FirstName); // Output: First Name: John Console.WriteLine("Last Name: {0}", person.LastName); // Output: Last Name:

In this example, the MissingMemberHandling property is set to Ignore, which means that the Age property in the JSON will be ignored and not set on the Person object.

Examples

  1. "Json.NET MissingMemberHandling setting example"

    • Description: Developers may search for examples of using the MissingMemberHandling setting in Json.NET. The following code demonstrates how to handle missing members during deserialization.
    // Code Implementation: var json = "{\"ExistingProperty\": \"Value\"}"; var settings = new JsonSerializerSettings { MissingMemberHandling = MissingMemberHandling.Error }; var result = JsonConvert.DeserializeObject<MyClass>(json, settings);

  2. "Json.NET MissingMemberHandling error vs ignore"

    • Description: Users might be interested in understanding the difference between MissingMemberHandling.Error and MissingMemberHandling.Ignore. The code below illustrates the use of both settings.
    // Code Implementation: // Error - Throws an exception for missing members var settingsError = new JsonSerializerSettings { MissingMemberHandling = MissingMemberHandling.Error }; // Ignore - Ignores missing members during deserialization var settingsIgnore = new JsonSerializerSettings { MissingMemberHandling = MissingMemberHandling.Ignore };

  3. "Json.NET deserialize JSON with missing members"

    • Description: This query suggests developers want to deserialize JSON data with potentially missing members using Json.NET. The code below shows how to handle missing members using the MissingMemberHandling setting.
    // Code Implementation: public class MyClass { public string ExistingProperty { get; set; } } var json = "{\"ExistingProperty\": \"Value\", \"MissingProperty\": \"Ignored\"}"; var settings = new JsonSerializerSettings { MissingMemberHandling = MissingMemberHandling.Ignore }; var result = JsonConvert.DeserializeObject<MyClass>(json, settings);

  4. "Json.NET MissingMemberHandling default behavior"

    • Description: Developers may want to know the default behavior of MissingMemberHandling in Json.NET. The code below illustrates the default behavior, which is to throw an exception for missing members.
    // Code Implementation: var json = "{\"ExistingProperty\": \"Value\"}"; var result = JsonConvert.DeserializeObject<MyClass>(json); // Throws exception for missing members by default

  5. "Handle missing properties in Json.NET C#"

    • Description: Users might be searching for ways to handle missing properties during deserialization in Json.NET. The following code showcases how to use the MissingMemberHandling setting to handle missing properties.
    // Code Implementation: public class MyClass { public string ExistingProperty { get; set; } } var json = "{\"ExistingProperty\": \"Value\", \"MissingProperty\": \"Handled\"}"; var settings = new JsonSerializerSettings { MissingMemberHandling = MissingMemberHandling.Ignore }; var result = JsonConvert.DeserializeObject<MyClass>(json, settings);

  6. "Json.NET MissingMemberHandling exception details"

    • Description: This query suggests users want more details on the exception thrown when MissingMemberHandling is set to Error in Json.NET. The code below provides an example.
    // Code Implementation: public class MyClass { public string ExistingProperty { get; set; } } var json = "{\"ExistingProperty\": \"Value\", \"MissingProperty\": \"ThrowsException\"}"; var settings = new JsonSerializerSettings { MissingMemberHandling = MissingMemberHandling.Error }; try { var result = JsonConvert.DeserializeObject<MyClass>(json, settings); } catch (JsonSerializationException ex) { Console.WriteLine($"Exception: {ex.Message}"); }

  7. "Json.NET MissingMemberHandling ignore specific members"

    • Description: Developers might be interested in ignoring specific missing members during deserialization in Json.NET. The code below demonstrates how to achieve this using JsonPropertyAttribute.
    // Code Implementation: public class MyClass { [JsonProperty(DefaultValueHandling = DefaultValueHandling.Ignore)] public string MissingProperty { get; set; } } var json = "{\"ExistingProperty\": \"Value\", \"MissingProperty\": \"Ignored\"}"; var result = JsonConvert.DeserializeObject<MyClass>(json);

  8. "Json.NET MissingMemberHandling error for unknown properties"

    • Description: This query suggests users want to throw an error for unknown properties during deserialization in Json.NET. The code below shows how to use MissingMemberHandling to achieve this.
    // Code Implementation: public class MyClass { public string ExistingProperty { get; set; } } var json = "{\"ExistingProperty\": \"Value\", \"UnknownProperty\": \"ThrowsError\"}"; var settings = new JsonSerializerSettings { MissingMemberHandling = MissingMemberHandling.Error }; try { var result = JsonConvert.DeserializeObject<MyClass>(json, settings); } catch (JsonSerializationException ex) { Console.WriteLine($"Exception: {ex.Message}"); }

  9. "Json.NET MissingMemberHandling deserialize dynamic objects"

    • Description: Developers may be interested in using MissingMemberHandling when deserializing dynamic objects in Json.NET. The code below demonstrates handling missing members in dynamic objects.
    // Code Implementation: var json = "{\"ExistingProperty\": \"Value\", \"MissingProperty\": \"Handled\"}"; var settings = new JsonSerializerSettings { MissingMemberHandling = MissingMemberHandling.Ignore }; dynamic result = JsonConvert.DeserializeObject(json, settings);

  10. "Json.NET MissingMemberHandling preserve order"

    • Description: Users might be looking for a way to preserve the order of properties when using MissingMemberHandling in Json.NET. The code below shows how to handle missing members while preserving the order.
    // Code Implementation: public class MyClass { public string ExistingProperty { get; set; } } var json = "{\"ExistingProperty\": \"Value\", \"MissingProperty\": \"Handled\"}"; var settings = new JsonSerializerSettings { MissingMemberHandling = MissingMemberHandling.Ignore }; var result = JsonConvert.DeserializeObject<MyClass>(json, settings);

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