View Code Extensions

Views in D365 F&O support code extensions through augmentation classes using Chain of Command, just like tables. Since views inherit from Common, many of the same methods are available for wrapping.

Creating a View Extension Class

[ExtensionOf(tableStr(SAMOCustTransView))]
final class SAMOCustTransView_Extension
{
    // Wrapped methods and new methods
}

note

Views use tableStr() (not viewStr()) in the [ExtensionOf] attribute because views are treated as table-like objects in the X++ type system.

Naming Convention

Element	Pattern	Example
Extension class	<Prefix><ViewName>_Extension	SAMOCustTransView_Extension

Methods That Can Be Wrapped

Views support a subset of table methods for CoC wrapping. Since views are typically read-only, data manipulation events are less common.

Method	Description
validateWrite()	Validate before write (if the view supports updates).
validateDelete()	Validate before delete.
validateField(FieldId)	Field-level validation.
modifiedField(FieldId)	React to field changes.
initValue()	Set default values.
postLoad()	Post-load processing for computed display values.

Example: Adding Post-Load Logic

[ExtensionOf(tableStr(SAMOCustTransView))]
final class SAMOCustTransView_Extension
{
    public void postLoad()
    {
        next postLoad();

        // Populate a display field after load
        this.SAMODisplayStatus = SAMOStatusHelper::getStatusText(this.Status);
    }
}

Adding New Methods

[ExtensionOf(tableStr(SAMOCustTransView))]
final class SAMOCustTransView_Extension
{
    public AmountCur SAMOCalculateBalance()
    {
        return this.AmountMST - this.SettleAmountMST;
    }
}