C# : Set a default value for MFIdentifier in Configuration

Question

Hello, 
 
 In a VAF application, I want to show the MFidentifier in configuration panel. But I can't make the default value work. It's always marked as error. For example: 
 
 [DataMember]
[MFPropertyDef(Required = true)]
public MFIdentifier mfIdPropActeur = "PD.SOCLE.Acteur";

[DataMember]
[MFPropertyDef(Required = true)]
[JsonConfEditor(DefaultValue = "PD.SOCLE.Action")]
public MFIdentifier mfIdPropAction = "PD.SOCLE.Action"; 
 
 The question is simple : how to make work? How to specify 
 
 Thanks, 
 Amaury Bianchi

Craig Hawker · Accepted Answer

amaury.bianchi said: I am sorry for missing that, I was reluctant to use that tag because it allow the user to put nothing then save... But that's better than errors. 
 
 But that's the reason why you validate your configuration at runtime. 
 The attribute you linked to is part of the dotnet BCL, not directly related to VAF development: DataMemberAttribute Class (System.Runtime.Serialization) | Microsoft Learn 
 It is used to define that a member should be serialized to the serialized representation (JSON, in this case) of the object. There's more information on what it does in the documentation.

Craig Hawker · Answer

You can mark the value as not mandatory: Editors (m-files.com)

C# : Set a default value for MFIdentifier in Configuration

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