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Creating default values for properties on pages



I already know of SetDefaultValues on PageData, but as far as I know this only executes when the page instance is created.

public override void SetDefaultValues(ContentType contentType)

Is there a way to set default properties on a page that already exists? And only if the property is NULL?

Edited, Sep 23, 2020 13:08
Carl S - Sep 24, 2020 4:53
I don't see how this will help since I only need it to run once and at startup.
So if I use IInitializableModule maybe and get the items.
Ravindra S. Rathore - Sep 25, 2020 7:09
Hi Carl S, The content event will trigger when you publish/create/delete the content so you can check your NULL condition there
Carl S - Sep 25, 2020 7:13
Hi Ravindra S. Rathore, Yep I know. But as I wrote before. I need it to be created at startup. Cannot wait for the user to publish the item.
Ravindra S. Rathore - Sep 25, 2020 7:55
Use the CreatingContent or CreatedContent based on your need.

You can create a scheduled job, or an admin tool that will:

  • Get all pages of a specific type
  • For every page
    • Check if the property is null
      • Create writable clone of the page
      • Update property
      • Save

Or, lets say your property is of type string, and you want to set it's default value some time after adding it.

You could probably do:

public class PropertyStringWithDefaultHackValue : PropertyString
     public override object Value => base.Value ?? "Hack";

And then change your property on your content type to:

[Display(Name = "This should work")]
public virtual string MyString { get; set; }
Edited, Sep 23, 2020 15:17
Carl S - Sep 24, 2020 4:55
It is not a string, it's a custom property type, IList<..> and this contains a IList<...>.
I'll try a IInitializableModule and see if I can solve it that way.
Carl S - Sep 24, 2020 5:30
I think this worked even with an IList<...> have to test it further.
Carl S - Sep 24, 2020 5:30
Thanks for now.
Carl S - Sep 25, 2020 6:58
Tomas Hensrud Gulla, your solution does not work for propertystring.. it worked for a IList for some reason.

Ok tried the IInitializableModule and get an exception:

The property XXX is read-only

How do I make it writable? There is no overload called "MakeWritable" or something as far as I can see.

Note! This is a IList that I try to initiate from null in this instance.

Edited, Sep 24, 2020 5:16
Tomas Hensrud Gulla - Sep 25, 2020 7:51
CreateWritableClone() og the PageData object.

What Tomas suggested does not work. At least not in a already custom property type. Any other ideas?

public class CustomInnerProperty
     [Display(Order = 900, Name = "Id")]
     public virtual string Id { get; set; } = Guid.NewGuid().ToString();


public class StringAsGuidDescriptor : PropertyString
    public override object Value
       get => string.IsNullOrEmpty(base.String) ? Guid.NewGuid().ToString() : base.String;
       set => SetPropertyValue(value, () => base.String = value?.ToString());

public class CustomInnerPropertyDescriptor : CollectionEditorDescriptor<CustomInnerProperty>
   public CustomInnerPropertyDescriptor()
      GridDefinition.DisableDndSorting = true;

public class CustomOuterProperty
   [Display(Order = 100, Name = "Items")]
   [EditorDescriptor(EditorDescriptorType = typeof(CustomInnerPropertyDescriptor))]
   public virtual IList<CustomInnerProperty> Items { get; set; }
Sep 28, 2020 12:13
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