Ошибка no symbols loaded

Start debugging, as soon as you’ve arrived at a breakpoint or used Debug > Break All, use Debug > Windows > Modules. You’ll see a list of all the assemblies that are loaded into the process. Locate the one you want to get debug info for. Right-click it and select Symbol Load Information. You’ll get a dialog that lists all the directories where it looked for the .pdb file for the assembly. Verify that list against the actual .pdb location. Make sure it doesn’t find an old one.

In normal projects, the assembly and its .pdb file should always have been copied by the IDE into the same folder as your .exe, i.e. the binDebug folder of your project. Make sure you remove one from the GAC if you’ve been playing with it.

Check to make sure that you are not in release but in Debug.

When in debug:

First try rebuilding your project by right mouse click the project > Rebuild
If that doesn’t work, try a clean of the project (right mouse click on the project > clean).

If that didn’t work check this:

1. Right mouse click your project
2. Select [Properties]
3. Select the [Build] tab
4. Make sure [Define DEBUG constant] and [Define TRACE constant] are checked
5. Make sure [Optimize Code] is unchecked
6. Click the [Advanced] button at the bottom of the Build tabpage
7. Make sure that [Debug Info:] is set to [full]
8. Click [OK] and rebuild the project

(step 7 generates the .pdb files, these are the debugging symbols)

Uncheck the «Enable Just My Code» option in the

Tools/Options/Debugging/General

Just something simple to try — you may have tried it already.
Right click the Solution in solution explorer, click «clean solution», this deletes all the compiled and temporary files associated with a solution.

Do a rebuild of the solution and try to debug again.

I’ve also had troubles with breakpoints multiple projects in a solution — some compiled as x86, some as x64.

The selected answer led me to fix my problem. But I need to do a few things more:

Even with «Debug» selected in the dropdown:

And in the project Properties > Build:

The Visual Studio was not loading symbols to a specific project. So in that dropdown I select «Configuration Manager» and saw that the settings to my web project was incorrect:

Then I set that to «Debug» and it started to generate the .pdb file.
BUT I need to manually copy the PDB and DLL and put in the folder that VS was looking (here is where the selected answer helped me):

Sometimes, even though it gives you this error, the Breakpoint still gets hit, so just ignore the error.

This happens fairly often in the Views of an MVC web app, i.e. .cshtml.

Check if your .pbd file is missing in your bin/Debug folder. If it is then go to «Properties» of your project, selected «Build» and then «Advanced» at the bottom. Choose «full» under «Debug info» in the new window that appeared. This was my issue and solved it for me.

Debug > Windows > Modules to see what modules were being loaded put me in the right direction.

In my case IIS Express seemed to be loading a different DLL from the temporary ASP.NET files.

The solution?

1. Browse to C:Users<YOUR USER>AppDataLocalTempTemporary ASP.NET Filesvs
2. Delete everything in this directory!

I was able to fix the error by simply setting the option in the ‘Attach to Process‘ to ‘Automatically determine the type of code to debug‘ option as shown in the attached screenshot.

Simply follow the steps below:

 - Go to **Debug** from the menu bar 
 - Click on **Attach to Process** 
 - Near the **Attach to** option, click on the **Select** button 
 - The **Select Code Type** window will appear 
 - Now select the option **Automatically determine the type of code 
   to debug** and click the OK button.

In my case «Optimize Code» was checked in my project properties. This caused VS to see my assembly as «not my code», and in turn, it did not load symbols for it.

The solution was to uncheck this.

Try running visual studio as an administrator within windows.

You need to enable «Generate debug info» in compiler settings

I tried everything mentioned above, but nothing worked.
[Clean solution, and check for PDB files etc.]

Even publishing the same solution did not resolve the issue.

Then I went to back to what I usually do to resolve (fool this stubborn Visual Studio)

All I did was to make a deliberate change in code and publish the solution.
Then I reverted the change and published again.

Voila [PDB files rid of evil spirits].. Not a smart resolution, but this did work..

We found the cause of our problem. This code was using the «CodeBehind» attribute in the Page directive of the .aspx file instead of the «CodeFile» attribute (ASP.NET 2.0 and beyond). After days of desperation, a simple search and replace solved the problem.

Webapplications (IIS Express) only:

• Rightclick IIS Express Tray and close the IIS.
• Clean Solution

Option «Start debugging, Debug + Windows + Modules» does not exist in Microsoft Visual Studio Express 2013 edition.

Unchecking «Use Managed Compatibility Mode» in Tools Options Debugging fixes this.

1. Clean solution and Rebuild
2. Check the configuration is set to Debug
3. Make sure that the PDB file is in the Debug folder it self
4. From Debug menu click Enable All Break points

Check are the following two setting the same in Visual Studio:

Right click test project, go to Properties, Build tab, and look at Platform target

Mine are all set to «Any CPU» so x64

On the Main Menu bar, go to Test, Test Settings, Default Processor Architecture

Mine was set to X86

Changing this to X64 to match above setting made the built in Visual Studio menu “Debug Test(s)” work and hit breakpoints that were previously ignored with the message “The breakpoint will not currently be hit. No symbols have been loaded for this document”.

Update:

For Visual Studio 2019 the menus have been moved around a bit:

Instead of doing all these things just Close and reopen

Project Properties (then select your build config) > Build Tab > Advanced… > Debug Info (dropdown)

Set to ‘all’ or ‘pdb-only’ then rebuild

After trying a bunch of these, the thing that ultimately worked for me was this:

In Debug > Options > General, uncheck Enable Edit and Continue.

I think the source if this error is, the debug symbols have a hard time surfacing to the solution after building for release.

I tried all the other answers — generally, regenerating .pdb symbols or checking their location, cleaning and rebuilding project, ensuring active configuration is not Release etc.

What eventually worked for me is right-clicking on the project in solution explorer > Debug > Start new instance.