1. Visual Studio Not Autocompleting Unity Free
2. Visual Studio Not Autocompleting Unity Components
3. Visual Studio Not Autocompleting Unity Code
4. Unity Not Autofilling Visual Studio
5. Visual Studio Not Autocompleting Unity 2019

19 April 2020: We’ve updated this article with a contributed solution from one of our readers in the comments section.

One of the biggest perks of using Microsoft’s Visual Studio to write your Unity scripts is IntelliSense — a code completion aid in Visual Studio that offers suggestions as you write your code, and contextually presents you with information about classes, properties and methods that you are working with.

Given Unity’s enormous scripting API, IntelliSense is a tremendously helpful feature, especially for coders who are beginning their foray into developing games and software with Unity; and while we’d love to say that IntelliSense is automatically set up and linked to Unity’s API when you install it with the Unity Editor, sometimes that’s just not the case. So, if you’ve got both Unity and Visual Studio set up, but find that IntelliSense is still not offering Unity API suggestions, then this guide is for you.

As soon as I start up Visual Studio Code, my OmniSharp server starts up, but then says that it is unable to load my csproj file. Steps to Reproduce. Start up Unity; Right-click on the Projects folder; Click 'Open C# Project' Expected Behavior. Autocomplete and IntelliSense would be active as the cs files are being edited. Actual Behavior. The first step is if you have already opened your Visual Studio, close it. Then go to Unity and then go to Edit → Preferences You will see the following window after you select the External Tools.

There can be many reasons why IntelliSense is failing to work properly on your device, and we are assuming that you’ve already scoured the Internet a fair bit before stumbling on our article. Hence, we’ve put together a table of contents of sorts below, so if you’ve already tried some of the solutions we have, you can skip right through them.

1. Getting IntelliSense working

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1. Is my IntelliSense not working?

For IntelliSense to detect and work with Unity’s API, Visual Studio needs to:

1. Be linked to the Unity Editor, and;
2. Have the appropriate extensions installed (read further to find out what they are)

If you’ve installed Visual Studio via Unity Hub, this can have been automatically set up, but not always. Due to the bevy of ways which you can install Unity and Visual Studio, misconfigurations can happen, and you might end up with Visual Studio not integrating itself into Unity, and an IntelliSense feature that is not properly linked to Unity’s API.

We’ve found that, when installing some versions of Unity 2019 and 2020, Visual Studio does not always integrate with Unity’s API by default. So if things are not working properly, it might not be caused by misconfiguration on your end.

To check if IntelliSense is properly set up, open any script from the Unity Editor, and look out for 2 things:

1. Whether the top-left dropdown says Miscellaneous Files. If it does, then IntelliSense is not set up.
2. Try declaring a Unity variable, like a GameObject. If IntelliSense is properly set up, Visual Studio should have an auto-complete suggestion for you before you finish typing.

2. Getting IntelliSense working

So if IntelliSense isn’t working for you, what should you do?

a. Open your scripts from Unity

Before you try anything else from here, first make sure that your scripts are opened from within Unity, i.e. whenever you want to edit your scripts, double-click on them in the Unity Editor so that Visual Studio is opened by Unity.

If IntelliSense still doesn’t work when you do this, then continue onto the steps below:

b. Setting Unity’s External Script Editor

From the Unity Editor, access the Preferences window from Edit > Preferences. Then, click on the External Tools tab.

Set the External Script Editor to the version of Visual Studio that you installed alongside Unity. Then, restart Visual Studio and see if IntelliSense now works. If it still doesn’t, then you might be missing…

If Visual Studio doesn’t appear on the dropdown, you will have to use the Browse… option (pictured above) to find it. It’s typically under C:Program Files (x86)Microsoft Visual Studio2019CommunityCommon7IDEdevenv.exe for Windows devices.

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c. Visual Studio Tools for Unity

To install this, open Visual Studio and go to Tools > Get Tools and Features.

Note: You’ll need administrator permissions to open this window, as it makes changes to the Visual Studio installation on your computer.

Once the installer is open, go to Workloads and find Game development with Unity. Check the box, and then click on the Modify button on the bottom-right corner to begin installation.

A popup may ask you to close certain processes before beginning installation. If this happens, close your Visual Studio project and the Unity Editor application.

Visual Studio Not Autocompleting Unity Free

When installation completes, restart both Unity and Visual Studio, then check to see if IntelliSense now works.

The Games development with Unity workload actually installs 2 additional Visual Studio components — Visual Studio Tools for Unity and C# and Visual Basic. You can install both modules individually by going to the Individual components tab, and checking both components in the list that is shown.

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d. Check your .NET API compatibility level

If IntelliSense still refuses to work, you can open the Unity Editor and head to Edit > Project Settings and access the Player (or Player Settings) tab. Scroll down to the Other Settings sub-tab, and find the Api Compatibility Level dropdown under the Configuration heading.

You want to set the Api Compatibility Level to a different option, and see which is the one that works for your device.

e. Regenerating your Unity project files

If the above solutions we’ve proposed did not work for you, you can also try this solution from one of our comment contributions.

Note: Back up your Unity project before trying this, as we are deleting some essential project files and letting Unity regenerate them.

1. Close both Visual Studio and Unity on your device.
2. Remove all .sln and .csproj files in your Unity project folder.
3. Remove the .vs and Library folders in your Unity project folder.
4. Re-open the project in Unity, then go to Assets > Open C# Project to open Visual Studio.

3. Conclusion

As with the other articles on the blog, we’d love if you leave a comment below, especially if you:

1. Find any errors in this article, or;
2. Find an IntelliSense fix that is not listed in this article

Your comments will add on to the information that is already here, and help other future readers!

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In this section, you'll learn how to use Visual Studio Tools for Unity's integration and productivity features, and how to use the Visual Studio debugger for Unity development.

Open Unity scripts in Visual Studio

Once Visual Studio is set as the external editor for Unity, double-clicking a script from the Unity editor will automatically launch or switch to Visual Studio and open the chosen script.

Alternatively, you can open Visual Studio with no script open in the source editor by selecting the Assets > Open C# Project menu in Unity.

Unity documentation access

You can access the Unity scripting documentation quickly from Visual Studio. If Visual Studio Tools for Unity doesn't find the API documentation locally, it will try to find it online.

• In Visual Studio, highlight or place the cursor over the Unity API you want to learn about, then press Ctrl+Alt+M, Ctrl+H
• You can also use the Help > Unity API Reference menu instead of the keybinding.

• In Visual Studio for Mac, highlight or place the cursor over the Unity API you want to learn about, then press Cmd+'
• You can also use the Help > Unity API Reference menu instead of the keybinding.

Intellisense for Unity API Messages

Intellisense code-completion makes it easy to implement Unity API messages in MonoBehaviour scripts, and assists with learning the Unity API. To use IntelliSense for Unity messages:

1. Place the cursor on a new line inside the body of a class that derives from MonoBehaviour.

2. Begin typing the name of a Unity message, such as OnTriggerEnter.

3. Once the letters 'ontri' have been typed, a list of IntelliSense suggestions appears.

4. The selection on the list can be changed in three ways:

   • With the Up and Down arrow keys.

   • By clicking with the mouse on the desired item.

   • By continuing to type the name of the desired item.

5. IntelliSense can insert the selected Unity message, including any necessary parameters:

   • By pressing Tab.

   • By pressing Enter.

   • By double-clicking the selected item.

Unity MonoBehavior scripting wizard

You can use the MonoBehavior wizard to view a list of all the Unity API methods and quickly implement an empty definition. This feature, particularly with the Generate method comments option enabled, is helpful if you are still learning what's available in the Unity API.

To create empty MonoBehavior method definitions with the MonoBehavior wizard:

1. In Visual Studio, position the cursor where you want the methods to be inserted, then press Ctrl+Shift+M to launch the MonoBehavior wizard. In Visual Studio for Mac, press Cmd+Shift+M.

2. In the Create script methods window, mark the checkbox next to the name of each method you want to add.

3. Use the Framework version dropdown to select your desired version.

4. By default, the methods are inserted at the position of the cursor. Alternatively, you can choose to insert them after any method that's already implemented in your class by changing the value of the Insertion point dropdown to the location you want.

5. If you want the wizard to generate comments for the methods you selected, mark the Generate method comments checkbox. These comments are meant to help you understand when the method is called and what its general responsibilities are.

6. Choose the OK button to exit the wizard and insert the methods into your code.

Unity Project Explorer

The Unity Project Explorer shows all of your Unity project files and directories in the same way that the Unity Editor does. This is different than navigating your Unity scripts with the normal Visual Studio Solution Explorer, which organizes them into projects and a solution generated by Visual Studio.

• On the main Visual Studio menu, choose View > Unity Project Explorer. Keyboard shortcut: Alt+Shift+E

• In Visual Studio for Mac, the Solution Pad automatically behaves like this when a Unity project is opened.

Unity debugging

Visual Studio Tools for Unity lets you debug both editor and game scripts for your Unity project using Visual Studio's powerful debugger.

Debug in the Unity editor

Start debugging

Visual Studio Not Autocompleting Unity Components

1. Connect Visual Studio to Unity by clicking the Play button labeled Attach to Unity, or use the keyboard shortcut F5.

1. Connect Visual Studio to Unity by clicking the Play button, or type Command + Return, or F5.

2. Switch to Unity and click the Play button to run the game in the editor.

3. When the game is running in the Unity editor while connected to Visual Studio, any breakpoints encountered will pause execution of the game and bring up the line of code where the game hit the breakpoint in Visual Studio.

Stop debugging

Click the Stop button in Visual Studio, or use the keyboard shortcut Shift + F5.

Click the Stop button in Visual Studio for Mac, or press Shift + Command + Return.

To learn more about debugging in Visual Studio, see First look at the Visual Studio Debugger.

Attach to Unity and Play

Visual Studio Not Autocompleting Unity Code

For added convenience, you can change the Attach to Unity button to Attach to Unity and Play mode.

1. Click the small down arrow next to the Attach to Unity button.
2. Select Attach to Unity and Play from the dropdown menu.

The play button becomes labeled Attach to Unity and Play. Clicking this button or using the keyboard shortcut F5 now automatically switches to the Unity editor and runs the game in the editor, in addition to attaching the Visual Studio debugger.

Starting debugging and playing the Unity editor can be completed in a single step directly from Visual Studio for Mac by choosing the Attach to Unity and Play configuration.

Note

If you started debugging using the Attach to Unity and Play configuration, the Stop button will also stop the Unity Editor.

Debug Unity player builds

You can debug development builds of Unity players with Visual Studio.

Enable script debugging in a Unity player

1. In Unity, open the Build Settings by selecting File > Build Settings.

2. In the Build Settings window, mark the Development Build and Script Debugging checkboxes.

Select a Unity instance to attach the debugger to

• In Visual Studio, on the main menu, choose Debug > Attach Unity Debugger.

  The Select Unity Instance dialog displays some information about each Unity instance that you can connect to.

  Project

  The name of the Unity project that's running in this instance of Unity.

  MachineThe name of the computer or device that this instance of Unity is running on.

  TypeEditor if this instance of Unity is running as part of the Unity Editor; Player if this instance of Unity is a stand-alone player.

  PortThe port number of the UDP socket that this instance of Unity is communicating over.

Important

Because Visual Studio Tools for Unity and the Unity instance are communicating over a UDP network socket, your firewall may need rule to allow it. If needed, you may see a prompt, you'll have to authorize the connection so that VSTU and Unity can communicate.

• In Visual Studio for Mac, on the top menu, choose Run > Attach to Process.
• In the Attach to Process dialog, select Unity Debugger option in the Debugger drop-down menu at the bottom.
• Select a Unity instance from the list and click the Attach button.

Debug a DLL in your Unity project

Many Unity developers are writing code components as external DLLs so that the functionality they develop can be easily shared with other projects. Visual Studio Tools for Unity makes it easy to debug code in these DLLs seamlessly with other code in your Unity project.

Note

At this time, Visual Studio Tools for Unity only supports managed DLLs. It does not support debugging of native code DLLs, such as those written in C++.

Note that the scenario described here assumes that you have the source code—that is, you are developing or re-using your own first-party code, or you have the source code to a third-party library, and plan to deploy it in your Unity project as a DLL. This scenario does not describe debugging a DLL for which you do not have the source code.

To debug a managed DLL project used in your Unity project

1. Add your existing DLL project to the Visual Studio solution generated by Visual Studio Tools for Unity. Less commonly, you might be starting a new managed DLL project to contain code components in your Unity project; if that's the case, you can add a new managed DLL project to the Visual Studio solution instead.

   In either case, Visual Studio Tools for Unity maintains the project reference, even if it has to regenerate the project and solution files again, so you only need to perform these steps once.

2. Reference the correct Unity framework profile in the DLL project. In Visual Studio, in the DLL project's properties, set the Target framework property to the Unity framework version you're using. This is the Unity Base Class Library that matches the API compatibility that your project targets, such as the Unity full, micro, or web base class libraries. This prevents your DLL from calling framework methods that exist in other frameworks or compatibility levels, but which might not exist in the Unity framework version you're using.

Note

The following is only required if you are using Unity's legacy runtime. If you are using the new Unity runtime, you don't need to use those dedicated 3.5 profiles anymore. Use a .NET 4.x profile compatible with your Unity version.

3. Copy the DLL to your Unity project's Asset folder. In Unity, assets are files that are packaged and deployed together with your Unity app so that they can be loaded at run-time. Since DLLs are linked at run time, DLLs must be deployed as assets. To be deployed as an asset, the Unity Editor requires the DLLs to be put inside the Assets folder in your Unity project. There are two ways you can do this:

   • Modify the build settings of your DLL project to include a post-built task that copies the output DLL and PDB files from its output folder to the Assets folder of your Unity project.

   • Modify the build settings of your DLL project to set its output folder to be the Assets folder of your Unity project. Both DLL and PDB files will be placed in the Assets folder.

   The PDB files are needed for debugging because they contain the DLL's debugging symbols, and map the DLL code to its source code form. If you are targeting the legacy runtime, Visual Studio Tools for Unity will use information from the DLL and PDB to create a DLL.MDB file, which is the debug symbol format used by the legacy Unity scripting engine. If you are targeting the new runtime, and using Portable-PDB, Visual Studio Tools for Unity will not try to do any symbol conversion as the new Unity runtime is able to natively consume Portable-PDBs.

   More information about PDB generation can be found here. If you are targeting the new runtime, please make sure that 'Debugging Information' is set to 'Portable', in order to properly generate Portable-PDB. If you are targeting the legacy runtime, you need to use 'Full'.

4. Debug your code. You can now debug your DLL source code together with your Unity project's source code, and use all the debugging features you are used to, such as breakpoints and stepping through code.

Unity Not Autofilling Visual Studio

Keyboard shortcuts

You can quickly access the Unity Tools for Visual Studio functionality by using their keyboard shortcuts. Here's a summary of the shortcuts that are available.

You can change the shortcut key combinations if you don't like the default. For information on how to change it, see Identify and customize keyboard shortcuts in Visual Studio.

Visual Studio Not Autocompleting Unity 2019

You can change the shortcut key combinations if you don't like the default. For information on how to change it, see Customizing the IDE.