NonSerialized on property
C#.NetSerializationPropertiesC# Problem Overview
When I write code like this
[XmlIgnore]
[NonSerialized]
public List<string> paramFiles { get; set; }
I get the following error:
Attribute 'NonSerialized' is not valid on this declaration type.
It is only valid on 'field' declarations.
If I write
[field: NonSerialized]
I get the following warning
'field' is not a valid attribute location for this declaration.
Valid attribute locations for this declaration are 'property'.
All attributes in this block will be ignored.
If I write
[property: NonSerialized]
I get the following error (again):
Attribute 'NonSerialized' is not valid on this declaration type.
It is only valid on 'field' declarations.
How can I use [NonSerialized] on a property?
C# Solutions
Solution 1 - C#
Simple use:
[XmlIgnore]
[ScriptIgnore]
public List<string> paramFiles { get; set; }
Hopefully, it helps.
Solution 2 - C#
Well... the first error says that you can't do that... from http://msdn.microsoft.com/en-us/library/system.nonserializedattribute.aspx
[AttributeUsageAttribute(AttributeTargets.Field, Inherited = false)]
[ComVisibleAttribute(true)]
public sealed class NonSerializedAttribute : Attribute
I suggest using backing field
public List<string> paramFiles { get { return list;} set { list = value; } }
[NonSerialized]
private List<string> list;
Solution 3 - C#
From C# 7.3 you may attach attributes to the backing field of auto-implemented properties.
Hence the following should work if you update your project's language to C# 7.3:
[field: NonSerialized]
public List<string> paramFiles { get; set; }
Solution 4 - C#
For those using JSON instead of XML you can use the [JsonIgnore] attribute on properties:
[JsonIgnore]
public List<string> paramFiles { get; set; }
Available in both Newtonsoft.Json and System.Text.Json (.NET Core 3.0).
Solution 5 - C#
As of .NET 3.0, you can use DataContract instead of Serializable. With the DataContract though, you will need to either "opt-in" by marking the serializable fields with the DataMember attribute; or "opt-out" using the IgnoreDataMember.
The main difference between opt-in vs opt-out is that opt-out by default will only serialize public members, while opt-in will only serialize the marked members (regardless of protection level).