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An error occurring during compiling


Question

i'm building an Hide and seek game using csharp here is the code, it has 2 interfaces , 2 independent classes, 6 other classes which inherit from the interface and the other 2 classes, the code has zero errors and runs when pressed start. But some times during execution the code starts running and give me this error it pints to the line currentLocation.Exits.Name

 

So hears the cod for the entire program

  interface IHasExteriorDoor
    {
        string DoorDescription { get; }
        Location DoorLocation { get; set; }
    }
 interface IHidingPlace
    {
        string HidingPlaceName { get; }
    }
abstract class Location
    {
        public Location(string name)
        {
            this.name = name;
        }
        public Location[] Exits;
        private string name;
        public string Name
        {
            get { return name; }
        }
        public virtual string Description
        {
            get
            {
                string description = " You're standing in the " + name + ". You see exits to the following places:";

                for (int i = 0; i < Exits.Length; i++)
                {
                    description += "" + Exits[i].Name;
                    if (i != Exits.Length - 1)
                        description += ",";
                }
                description += ".";
                return description;
            }
        }
    }
class Opponent
    {
        private Random random;
        private Location myLocation;
        public Opponent(Location startingLocation)
        {
            myLocation = startingLocation;
            random = new Random();
        }
        public void Move()
        {
            if (myLocation is IHasExteriorDoor)
            {
                IHasExteriorDoor LocationWithDoor = myLocation as IHasExteriorDoor;
            
            if (random.Next(2) == 1)
                myLocation = LocationWithDoor.DoorLocation;
        }
        bool hidden = false;
        while(!hidden)
            {
            int rand = random.Next(myLocation.Exits.Length);
            myLocation = myLocation.Exits[rand];
            if(myLocation is IHidingPlace)
            hidden = true;
            }
        }
        public bool Check(Location locationToCheck)
        {
            if (locationToCheck != myLocation)
                return false;
            else
                return true;
        } 
    }
 class OutsideWithDoor : Outside, IHasExteriorDoor
    {
        public OutsideWithDoor(string name, bool hot, string doorDescription): base(name, hot)
            {
            this.doorDescription = doorDescription;
            }
        private string doorDescription;
        public string DoorDescription
        {
            get { return doorDescription; }
        }
        private Location doorLocation;
        public Location DoorLocation
        {
            get { return doorLocation; }
            set { doorLocation = value; }
        }
        public override string Description
        {
            get
            {
                return base.Description + "You see " + doorDescription + ".";
            }
        }
    }
 class Outside : Location
    {
        private bool hot;
        public bool Hot { get { return hot; } }

        public Outside(string name, bool hot) : base(name)
        {
            this.hot = hot;
        }
        public override string Description
        {
            get
            {
                string NewDescription = base.Description;
                if (hot)
                    NewDescription += "It's very hot.";
                return NewDescription;
            }
        }
    }
 class OutsideWithHidingPlace : Outside, IHidingPlace
    {
        public OutsideWithHidingPlace(string name, bool hot, string hidingPlaceName) : base(name, hot)
        { this.hidingPlaceName = hidingPlaceName; }

        private string hidingPlaceName;
        public string HidingPlaceName
        {
            get { return hidingPlaceName; }
        }
        public override string Description
        {
            get { return base.Description + "Someone could hide" + hidingPlaceName + "."; }
        }
    }
class RoomwithDoor: RoomWithHidingPlace, IHasExteriorDoor
    {
        public RoomwithDoor(string name, string decoration, string hidingPlaceName, string doorDescription):base(name, decoration, hidingPlaceName)
        { this.doorDescription = doorDescription; }
        private string doorDescription;
        public string DoorDescription
        {
            get { return doorDescription; }
        }
        private Location doorLocation;
        public Location DoorLocation
        {
            get { return doorLocation; }
            set { doorLocation = value; }
        }
    }
class Room: Location
    {
        private string decoration;

        public Room(string name, string decoration):base(name)
        {
            this.decoration = decoration;
        }
        public override string Description
        {
            get
            {
                return base.Description+"You see " + decoration + ".";
            }
        }
    }
 class RoomWithHidingPlace : Room, IHidingPlace
    {
        public RoomWithHidingPlace (string name, string decoration, string hidingPlaceName): base(name, decoration)
        {
            this.hidingPlaceName = hidingPlaceName;
        }
        private string hidingPlaceName;
        public string HidingPlaceName
        {
            get { return hidingPlaceName; }
        }
        public override string Description
        {
         get { return base.Description + "Someone could hide" + hidingPlaceName + "."; }
        }
    }
public partial class Form1 : Form
    {
        int Moves;
        Location currentLocation;

        RoomwithDoor livingRoom;
        RoomWithHidingPlace diningRoom;
        RoomwithDoor kitchen;
        Room stairs;
        RoomWithHidingPlace hallway;
        RoomWithHidingPlace bathroom;
        RoomWithHidingPlace masterBedroom;
        RoomWithHidingPlace secondBedroom;

        OutsideWithDoor frontYard;
        OutsideWithDoor backYard;
        OutsideWithHidingPlace garden;
        OutsideWithHidingPlace driveway;

        Opponent opponent;

        public Form1()
        {
            InitializeComponent();
            CreateObjects();
            opponent = new Opponent(frontYard);
            ResetGame(false);
            MoveToANewLocation(livingRoom);
        }
        private void MoveToANewLocation(Location newLocation)
        {
            Moves++;
            currentLocation = newLocation;
            RedrawForm();
        }
        private void RedrawForm()
        {
            exits.Items.Clear();
            for (int i = 0; i < currentLocation.Exits.Length; i++)
                exits.Items.Add(currentLocation.Exits[i].Name);
            exits.SelectedIndex = 0;
            description.Text = currentLocation.Description + "\r\n(move #" + Moves + ")";
            if(currentLocation is IHidingPlace)
            {
                IHidingPlace hidingPlace = currentLocation as IHidingPlace;
                exits.Text = "Check" + hidingPlace.HidingPlaceName;
                exits.Visible = true;
            }
            else
                exits.Visible = false;
                if (currentLocation is IHasExteriorDoor)
                    goThroughTheDoor.Visible = true;
                else
                    goThroughTheDoor.Visible = false;
        }
        private void CreateObjects()
        {
            livingRoom = new RoomwithDoor("Living Room", "an antique carpet","inside the closet", "an oak door with a brassknob");
            diningRoom = new RoomWithHidingPlace("Dining Room", "a crystal chandelier", "in the tall armorie");
            kitchen = new RoomwithDoor("Kitchen", "stainless steel appliances","in the cabinet", "a screen door");
            stairs = new RoomwithDoor("Kitchen", "stainless steel appliances", "in teh cabinet", "a screen door");
            hallway = new RoomWithHidingPlace("Upstairs Hallway", "a picture of a dog", "in the closet");
            bathroom = new RoomWithHidingPlace("Bathjroom", "a sink and a toilet", "in the shower");
            masterBedroom = new RoomWithHidingPlace("Master Bedroom", "a large bed", "under the bed");
            secondBedroom = new RoomWithHidingPlace("Second Bedroom", "a small bed", " under the bed");

            frontYard =new OutsideWithDoor("Front Yard", false, "a heavy-looking oak door ");
            backYard = new OutsideWithDoor("Back Yard", true, " a screen door");
            garden = new OutsideWithHidingPlace("Garden", false,"inside the shed");
            driveway = new OutsideWithHidingPlace("Driveway", true, "in the garage");

            diningRoom.Exits = new Location[] { livingRoom, kitchen };
            livingRoom.Exits = new Location[] { diningRoom, stairs };
            kitchen.Exits = new Location[] { diningRoom };
            stairs.Exits = new Location[] { livingRoom, hallway };
            hallway.Exits = new Location[] { stairs, bathroom, masterBedroom, secondBedroom };
            bathroom.Exits = new Location[] { hallway };
            masterBedroom.Exits = new Location[] { hallway };
            secondBedroom.Exits = new Location[] { hallway };
            frontYard.Exits = new Location[] { backYard, garden, driveway };
            backYard.Exits = new Location[] { frontYard, garden, driveway };
            garden.Exits = new Location[] { backYard, frontYard };
            driveway.Exits = new Location[] { backYard, frontYard };

            livingRoom.DoorLocation = frontYard;
            frontYard.DoorLocation = livingRoom;

            kitchen.DoorLocation = backYard;
            backYard.DoorLocation = kitchen;
        }
         private void ResetGame (bool displayMessage)
        {
            if (displayMessage)
            {
                MessageBox.Show("you found me in" + Moves + "moves!");
                IHidingPlace foundLocation = currentLocation as IHidingPlace;
                description.Text = "you found your opponent in " + Moves + "moves! He was hiding" + foundLocation.HidingPlaceName + ".";
            }
            Moves = 0;
            hide.Visible = true;
            goHere.Visible = false;
            check.Visible = false;
            goThroughTheDoor.Visible = false;
            exits.Visible = false;
        }

    

        private void goHere_Click(object sender, EventArgs e)
        {
            MoveToANewLocation(currentLocation.Exits[exits.SelectedIndex]);
        }

        private void goThroughTheDoor_Click(object sender, EventArgs e)
        {
            IHasExteriorDoor hasDoor = currentLocation as IHasExteriorDoor;
            MoveToANewLocation(hasDoor.DoorLocation);
        }

        private void check_Click(object sender, EventArgs e)
        {
            Moves++;
            if (opponent.Check(currentLocation))
                ResetGame(true);
            else
                RedrawForm();
        }

        private void Hide_Click(object sender, EventArgs e)
        {
            hide.Visible = false;
            for (int i = 1; i <= 10; i++)
            {
                opponent.Move();
                description.Text = i + "...";
                Application.DoEvents();
                System.Threading.Thread.Sleep(200);
            }
            description.Text = "Ready or not, here i come!";
            Application.DoEvents();
            System.Threading.Thread.Sleep(500);

            goHere.Visible = true;
            exits.Visible = true;
            MoveToANewLocation(livingRoom);
        }
    }

Although this program contains 0 errors the program stops compiling sometimes and points towards the line current.Exit.Name and give a pop up saying Null reference  exception was handled.

 

Here's how the form looks like FORM

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7 answers to this question

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  • 0
Location currentLocation = null;
// Or
Location currentLocation.Exits = null;

The error is caused because the value is null, this can be caused by either the whole currentLocation to be null or the Exits attribute to be null.

 

If I would have to guess:

 

You start at Location A which has exits B, C and D.

Then you go to exit Location C which has no exits, the attribute "exits" is null, this causes an error in the for loop which expects at least an empty array instead of null.

 

The NullReferenceException is the most common exception I've ever seen in a C# application :p

 

TL;DR

 

Always initialize your arrays/lists or check if they aren't null before using a loop.

 

Also this is not an compilation but an execution error, which means that the code will compile fine and can be distributed to the users which will see their application crash. Therefore it's always recommended to test all scenarios (0, 1 or multiple exits) for bugs before shipping the code.
 

This can be done manually or automated (recommended) with unit tests: https://www.youtube.com/watch?v=rW6LvPP4VvA

 

 

  • 0
  On 21/02/2017 at 12:51, Ch33f said:

Although this program contains 0 errors the program stops compiling sometimes and points towards the line current.Exit.Name and give a pop up saying Null reference  exception was handled.

Expand  

First, this is not a compile-time error! It does not happen while the program is compiling, it happens while the program is running, i.e. after compilation. If you have any confusion about compile- vs run-time you need to clear that up ASAP. The compiler turns your text files (*.cs) into executable files (*.dll, *.exe), which can then run inside an operating system process. Exceptions happen at run-time when your program is legal C# so it compiles, but it still manages to do something wrong (like in this case, dereferencing a null).

 

As @Seahorsepip mentions, if `currentLocation.Exits.Name` throws NullReferenceException then either currentLocation is null or currentLocation.Exits is null. Why are they null? What could you do to make them not null? That's yours to figure out.

 

 

  • Like 1
  • 0

After reading the code, it appears to me your problem is very simple...

 

abstract class Location
    {
        public Location(string name)
        {
            this.name = name;
        }
        public Location[] Exits;

you did not initialize Exits in the base constructor, nor did you initialize it in the inherited constructors as well.

Seems to me somewhere you should have this line somewhere in your constructors.

Exits = new Location[ExitCount];  //Where ExitCount is an integer

 

  • 0
  On 21/02/2017 at 18:19, Seahorsepip said:

The NullReferenceException is the most common exception I've ever seen in a C# application :p

Expand  

For me it's the "Object reference not set to an instance of an object" error (I've caused this in my apps forgetting to set it correctly), and the division by zero errors. I'm working on a C# GTA soundboard, and when I'm tired the object reference error happens a lot :) Caffeine normally helps :)

  • Like 1
  • 0
  On 21/02/2017 at 23:08, sao123 said:

After reading the code, it appears to me your problem is very simple...

Expand  

The exits are given a value in CreateObjects():

See Form1 constructor:

MoveToANewLocation(livingRoom);

Which sets currentLocation to livingRoom (which is generated by CreateObjects() and has the exits value diningRoom and stairs).

So exits don't need to be initialized in the Locations class itself to work but imagine what happens when the following method is called:

MoveToANewLocation(stairs);

And the stairs exits array attribute is not initialized in CreateObjects()?

 

Then it tries to for loop trough null instead of an array and we end up with a NullReferenceException :)

 

So initializing every array in the classes is a quick fix that does indeed solve the NullReferenceException issue in most cases but might not solve the underlying issue, maybe a Location should always have at least 1 exit as example.

 

As I said before it's saves a lot of work when unit tests are made for all use case scenarios(values, actions etc). Then it's directly clear when something stopped working that worked before.

 

  On 21/02/2017 at 23:33, Tidosho said:

For me it's the "Object reference not set to an instance of an object" error (I've caused this in my apps forgetting to set it correctly), and the division by zero errors. I'm working on a C# GTA soundboard, and when I'm tired the object reference error happens a lot :) Caffeine normally helps :)

Expand  

I always get StackOverflowExceptions since I have a habit to write a lot of recursion logic lately :p 

  • 0
  On 21/02/2017 at 23:33, Tidosho said:

For me it's the "Object reference not set to an instance of an object" error (I've caused this in my apps forgetting to set it correctly), and the division by zero errors. I'm working on a C# GTA soundboard, and when I'm tired the object reference error happens a lot :) Caffeine normally helps :)

Expand  

Try F# - no nulls (mostly) among other benefits ;)

  • 0

Thank You for the feedback, i got the program working, exits is the name given to the combo box and its has been initialized in Location class here is the edited version of form.

public partial class Form1 : Form
    {
        int Moves;
        Location currentLocation;

        RoomwithDoor livingRoom;
        RoomWithHidingPlace diningRoom;
        RoomwithDoor kitchen;
        Room stairs;
        RoomWithHidingPlace hallway;
        RoomWithHidingPlace bathroom;
        RoomWithHidingPlace masterBedroom;
        RoomWithHidingPlace secondBedroom;

        OutsideWithDoor frontYard;
        OutsideWithDoor backYard;
        OutsideWithHidingPlace garden;
        OutsideWithHidingPlace driveway;

        Opponent opponent;

        public Form1()
        {
            InitializeComponent();
            CreateObjects();
            opponent = new Opponent(frontYard);
            ResetGame(false);
            MoveToANewLocation(livingRoom);
        }
        private void MoveToANewLocation(Location newLocation)
        {
            Moves++;
            currentLocation = newLocation;
            RedrawForm();
            
        }
        private void RedrawForm()
        {
            exits.Items.Clear();
            for (int i = 0; i < currentLocation.Exits.Length; i++)
                exits.Items.Add(currentLocation.Exits[i].Name);
            exits.SelectedIndex = 0;
            description.Text = currentLocation.Description + "\r\n(move #" + Moves + ")";
            if(currentLocation is IHidingPlace)
            {
                IHidingPlace hidingPlace = currentLocation as IHidingPlace;
                check.Text = "Check" + hidingPlace.HidingPlaceName;
                check.Visible = true;
            }
            else
                check.Visible = false;
                if (currentLocation is IHasExteriorDoor)
                    goThroughTheDoor.Visible = true;
                else
                    goThroughTheDoor.Visible = false;
        }
        private void CreateObjects()
        {
            livingRoom = new RoomwithDoor("Living Room", "an antique carpet","inside the closet", "an oak door with a brassknob");
            diningRoom = new RoomWithHidingPlace("Dining Room", "a crystal chandelier", "in the tall armorie");
            kitchen = new RoomwithDoor("Kitchen", "stainless steel appliances","in the cabinet", "a screen door");
            stairs = new Room("Stairs", "a wooden bannister");
            hallway = new RoomWithHidingPlace("Upstairs Hallway", "a picture of a dog", "in the closet");
            bathroom = new RoomWithHidingPlace("Bathjroom", "a sink and a toilet", "in the shower");
            masterBedroom = new RoomWithHidingPlace("Master Bedroom", "a large bed", "under the bed");
            secondBedroom = new RoomWithHidingPlace("Second Bedroom", "a small bed", " under the bed");

            frontYard =new OutsideWithDoor("Front Yard", false, "a heavy-looking oak door ");
            backYard = new OutsideWithDoor("Back Yard", true, " a screen door");
            garden = new OutsideWithHidingPlace("Garden", false,"inside the shed");
            driveway = new OutsideWithHidingPlace("Driveway", true, "in the garage");

            diningRoom.Exits = new Location[] { livingRoom, kitchen };
            livingRoom.Exits = new Location[] { diningRoom, stairs };
            kitchen.Exits = new Location[] { diningRoom };
            stairs.Exits = new Location[] { livingRoom, hallway };
            hallway.Exits = new Location[] { stairs, bathroom, masterBedroom, secondBedroom };
            bathroom.Exits = new Location[] { hallway };
            masterBedroom.Exits = new Location[] { hallway };
            secondBedroom.Exits = new Location[] { hallway };
            frontYard.Exits = new Location[] { backYard, garden, driveway };
            backYard.Exits = new Location[] { frontYard, garden, driveway };
            garden.Exits = new Location[] { backYard, frontYard };
            driveway.Exits = new Location[] { backYard, frontYard };

            livingRoom.DoorLocation = frontYard;
            frontYard.DoorLocation = livingRoom;

            kitchen.DoorLocation = backYard;
            backYard.DoorLocation = kitchen;
        }
         private void ResetGame (bool displayMessage)
        {
            if (displayMessage)
            {
                MessageBox.Show("you found me in" + Moves + "moves!");
                IHidingPlace foundLocation = currentLocation as IHidingPlace;
                description.Text = "you found your opponent in " + Moves + "moves! He was hiding" + foundLocation.HidingPlaceName + ".";
            }
            Moves = 0;
            hide.Visible = true;
            goHere.Visible = false;
            check.Visible = false;
            goThroughTheDoor.Visible = false;
            exits.Visible = false;
        }

      /*  private void MoveToANewLocation(Location newLocation)
        {
            currentLocation = newLocation;

            exits.Items.Clear();
            for (int i = 0; i < currentLocation.Exits.Length; i++) 
            exits.Items.Add(currentLocation.Exits[i].Name);
            exits.SelectedIndex = 0;

            description.Text = currentLocation.Description;

            if (currentLocation is IHasExteriorDoor)
                goThroughTheDoor.Visible = true;
            else
                goThroughTheDoor.Visible = false;
        }*/

        private void goHere_Click(object sender, EventArgs e)
        {
            MoveToANewLocation(currentLocation.Exits[exits.SelectedIndex]);
        }

        private void goThroughTheDoor_Click(object sender, EventArgs e)
        {
            IHasExteriorDoor hasDoor = currentLocation as IHasExteriorDoor;
            MoveToANewLocation(hasDoor.DoorLocation);
        }

        private void check_Click(object sender, EventArgs e)
        {
            Moves++;
            if (opponent.Check(currentLocation))
                ResetGame(true);
            else
                RedrawForm();
        }

        private void Hide_Click(object sender, EventArgs e)
        {
            hide.Visible = false;
            for (int i = 1; i <= 10; i++)
            {
                opponent.Move();
                description.Text = i + "...";
                Application.DoEvents();
                System.Threading.Thread.Sleep(200);
            }
            description.Text = "Ready or not, here i come!";
            Application.DoEvents();
            System.Threading.Thread.Sleep(500);

            goHere.Visible = true;
            exits.Visible = true;
            MoveToANewLocation(livingRoom);
        }
    }

 

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Microsoft acknowledged the issue, which affects users on Windows, iOS, Android, and the web. Unfortunately, that is not the only negative story about OneDrive. A new report from a frustrated user revealed a scary tale of Microsoft locking them out of an account full of invaluable content. Outlook also has some issues, this time, with opening emails, and Microsoft 365 will soon disable outdated protocols for file access. Finally, Copilot in Excel received a major update for context awareness, which made the assistant more useful when answering questions about data. This week's browser updates include several releases. Firefox announced a new method for pinning and unpinning tabs. It is now available for testing in the Nightly channel. Microsoft Edge was updated with fixes for two security vulnerabilities (high severity) originating from Chromium. Finally, here is this week's Microsoft 365 Roadmap with an overview of all the new stuff that Microsoft added to the website. Here are other updates and releases you may find interesting: Microsoft 365 security in the spotlight after Washington Post hack. Microsoft expands European sovereign cloud offerings with new data and key controls. Microsoft Defender XDR received TITAN-powered Security Copilot recommendations. Microsoft reportedly plans more layoffs. Watchdog found Microsoft guilty of confusing advertising when it comes to Copilot. Here are the latest drivers and firmware updates released this week: AMD released a new chipset driver for Ryzen processors under version 7.06.02.123, which followed a security update for TPM-Pluton. Nvidia 576.80 WHQL with fixes for the RTX 5090 FE, new game support, and a long list of fixes. You can get some extra performance on certain AMD Ryzen chips with a simple system tweak. Surface Pro 11 and Surface Laptop 7 received big firmware updates with multiple fixes and improvements. Reviews are in Here is the hardware and software we reviewed this week This week, Steven Parker reviewed the TerraMaster D4 SSD, a palm-sized DAS with up to 32TB of storage that you can connect over USB4. This thing is rather impressive, and for a modest price tag, it delivers a tiny footprint, great looks, full RAID support in TOS 6, quick connection, and more. On the gaming side Learn about upcoming game releases, Xbox rumors, new hardware, software updates, freebies, deals, discounts, and more. AMD and Microsoft announced some big news this week. The two companies revealed a new multi-year partnership, which secures AMD as the future maker of chips for Xbox consoles and other hardware. Sarah Bond announced the partnership in a new video on the official Xbox media channels. Turn 10 Studios announced a new Forza Motorsport update. Update 21 brings IndyCar content, Career mode expansion, Featured Tours, new reward cars, and more. It is now available on Xbox and PC via the Microsoft Store and Steam. Minecraft is another Microsoft-owned game that received a big update this week. The long-anticipated graphics overhaul is finally here with directional lighting, volumetric fog, improved shadows, reflections, godrays, and a lot more. In addition, Mojang released Chase the Skies, the latest content drop, which adds happy ghasts, new music disks, a locator bar for players, environmental fog in the overworld, new background music, and all sorts of small gameplay changes. Microsoft announced new games for Game Pass. The latest additions include FBC: Firebreak, Crash Bandicoot 4: It's About Time, Start Trucker, Wildfrost, Rematch, Call of Duty: WWII, Rise of the Tomb Raider, and more. As usual, some games are leaving the subscription. Valve released a big update for the Steam overlay. The latest version introduced major upgrades to CPU and VRAM usage, temperatures, and other important metrics that you might want to track when playing games on your gaming rig. Deals and freebies Also, be sure to check out this week's Weekend PC Game Deals article, which features rhythm bundles, fishing festivals, DRM-free summer sales, and more. Other gaming news includes the following: Take-Two confirmed Borderlands 4 will not cost $80 for the base game. The Coalition expanded the Gears of War: Reloaded beta after its rocky start. Ara: History Untold 1.4 update delivered overhauls to AI, map generation, combat, and more. Star Citizen Alpha 4.2 update lands with radiation hazards, dynamic rain, and more. This link will take you to other issues of the Microsoft Weekly series. You can also support Neowin by registering a free member account or subscribing for extra member benefits, along with an ad-free tier option. Microsoft Weekly image background by steve_a_johnson on Pixabay
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