D365F&O - X++ - get form datasource in validatewrite in form event handlers


[FormDataSourceEventHandler(formDataSourceStr(AssetTable, AssetTable),
FormDataSourceEventType::ValidatingWrite)]
public static void AssetTable_OnValidatingWrite(FormDataSource sender,
FormDataSourceEventArgs e)
{
    FormDataSource  formDatasource;
    AssetTable AssetTable;

    FormRun formRun = sender.formRun();
    FormStringControl AssetId = formRun.design().controlName(formcontrolstr(AssetTable,
                        Identification_AssetId ));
    str AssetIdValue = AssetId.valueStr();

    MJAssetTable = sender.cursor();

    if (!AssetTable.AssetId)
    {
        AssetTable.AssetId =AssetIdValue;
    }
}

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