How to read uncommitted data from other table inside trigger - sql-server

Question

I have 2 tables, Contact and ContactFunction. They have a One to Many relationship, as in a Contact can have many ContactFunctions. So ContactFunction has ContactID as a foreign key. So in my .NetCore web application I can update a contact and their functions on the same page. But this is in fact saving two separate entities, named above. I have a trigger on the Contact table that puts inserts/updates/deletes into a history table. I need a way to also include any ContactFunction changes in this trigger too. But at this stage it seems there has been no commits yet to the ContactFunction table, because of the relationship I assume. Can you think of a way to do this other than creating a history table for both?
I'm trying to read the data from the ContactFunction table inside the Contact table trigger, but it's not there yet. the variable #FUNCTIONSSTRING is where I'm trying to read data from the second table (ContactFunction)
USE [DI_Business_IE_EF_Development04]
GO
/****** Object: Trigger [dbo].[ContactHistoryLog] Script Date: 25/01/2019 09:33:00 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TRIGGER [dbo].[ContactHistoryLog] ON [dbo].[Contact]
AFTER INSERT,UPDATE, DELETE
AS
BEGIN
SET NOCOUNT ON;
DECLARE #CurrentDateTime datetime2 = SYSUTCDATETIME();
DECLARE #Action varchar(10);
DECLARE #CONTACTID INT;
DECLARE #FIRSTUPDATE INT;
DECLARE #FUNCTIONSSTRING VARCHAR(250) = '';
DECLARE #INSERTEDID INT;
IF EXISTS (SELECT 1 FROM inserted)
BEGIN
IF EXISTS (SELECT 1 FROM deleted)
BEGIN
SET #Action = 'UPDATE'
END
ELSE
BEGIN
SET #Action = 'INSERT'
END
END
ELSE
BEGIN
SET #Action = 'DELETE'
END
/* Update start times for newly updated data */
UPDATE c
SET
StartDate = #CurrentDateTime, #CONTACTID = c.ID
FROM
dbo.Contact c
INNER JOIN inserted i
ON c.Id = i.Id
SELECT #FIRSTUPDATE = COUNT(*) FROM dbo.ContactHistory WHERE ContactId = #CONTACTID
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
SELECT
#FUNCTIONSSTRING = #FUNCTIONSSTRING + F.Name + ','
FROM ContactFunction CF
JOIN [Function] F ON F.ID = CF.FunctionID
WHERE CF.ContactID = #CONTACTID
INSERT INTO DBO.ContactHistory(
ContactId,
CompanyID,
Title,
Forename,
Surname,
JobTitle,
ExecutiveNumber,
IsInformationProvider,
Email,
UpdatedBy,
StartDate,
EndDate,
[Action],
FunctionNames
)
SELECT
I.Id,
I.CompanyID,
I.Title,
I.Forename,
I.Surname,
I.JobTitle,
I.ExecutiveNumber,
I.IsInformationProvider,
I.Email,
I.UpdatedBy,
#CurrentDateTime,
#CurrentDateTime,
#Action,
(SELECT SUBSTRING(#FUNCTIONSSTRING, 0, LEN(#FUNCTIONSSTRING)))AS FunctionNames
FROM
dbo.Contact c
RIGHT JOIN inserted I
ON c.Id = I.Id
-- if this is first update insert deleted value as well as inserted value, else just put in inserted
IF (#FIRSTUPDATE = 0)
BEGIN
INSERT INTO DBO.ContactHistory(
ContactId,
CompanyID,
Title,
Forename,
Surname,
JobTitle,
ExecutiveNumber,
IsInformationProvider,
Email,
UpdatedBy,
StartDate,
EndDate,
[Action],
FunctionNames
)
SELECT
d.Id,
d.CompanyID,
d.Title,
d.Forename,
d.Surname,
d.JobTitle,
d.ExecutiveNumber,
d.IsInformationProvider,
d.Email,
d.UpdatedBy,
d.StartDate,
ISNULL(d.StartDate,#CurrentDateTime),
'NONE',
(SELECT SUBSTRING(#FUNCTIONSSTRING, 0, LEN(#FUNCTIONSSTRING)))AS FunctionNames
FROM
dbo.Contact c
RIGHT JOIN deleted d
ON c.Id = d.Id
END
END
I would expect to see the latest changes to the ContactFunction table, but it's not there. is there a way to do this?