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To debug .NET Framework source, you must:
Enable stepping into .NET Framework source.
Have access to debugging symbols for the code.
You can choose to download debugging symbols immediately, or set options for later downloading. If you don't download symbols immediately, they'll download the next time you start debugging your app. While debugging, you can also use the Modules or Call Stack windows to download and load symbols.
Enable stepping into .NET Framework source
Open the Tools (or Debug) > Options pane and expand the All Settings > Debugging > General section.
Configure the following options:
- Clear the Enable Just My Code checkbox.
- Select the Enable Source Link support checkbox.
Expand the Debugging > Symbols > Search Locations section.
Select the Download symbols from the Microsoft Symbol Servers checkbox.
Open the Tools (or Debug) > Options dialog and expand the Debugging > General section.
Configure the following general options:
- Clear the Enable Just My Code checkbox.
- Select the Enable Source Link support checkbox.
Expand the Debugging > Symbols section.
In the Symbol file (.pdb) search locations group, select the Microsoft Symbol Servers checkbox.
Select OK.
Under Tools (or Debug) > Options > Debugging > General, select Enable .NET Framework source stepping.
If you had Just My Code enabled, a warning dialog box tells you that Just My Code is now disabled. Select OK.
If you didn't have a local symbol cache set, a warning dialog tells you a default symbol cache is set. Select OK.
Select OK to close the Options dialog.
Set or change symbol source locations and loading behavior
Open the Tools (or Debug) > Options pane and expand the All Settings > Debugging > Symbols > Search Locations section.
Select the Download symbols from the Microsoft Symbol Servers checkbox.
Open the Tools (or Debug) > Options dialog and expand the Debugging > Symbols section.
In the Symbol file (.pdb) search locations group, select the Microsoft Symbol Servers checkbox. This option accesses symbols from the public Microsoft Symbol Server.
To add other symbol locations, select Add and update existing locations by selecting Edit. Change the loading order of the locations with Move up and Move down.
To change your local symbols cache, edit or browse to a different location by selecting More actions (...) for the Cache symbols in this directory option.
To download symbols immediately, select Load all symbols. This button is available only while debugging.
If you don't download symbols now, the download happens the next time you start debugging.
- Select OK.
Load symbols from the Modules or Call Stack windows
During debugging, open the window by selecting Debug > Windows > Modules (or press Ctrl + Alt + U) or Debug > Windows > Call Stack (Ctrl + Alt + C).
Right-click a module for which symbols weren't loaded. In the Modules window, symbol loading status is in the Symbols Status column. In the Call Stack window, status is in the Frame Status column, and the frame is grayed-out.
Select Load Symbols from the menu to locate and load symbol files from a folder on your machine.
Select Symbol Load Information to show the locations the debugger searched for symbols.
- Select Symbol Settings, which opens the Tools (or Debug) > Options pane to the All Settings > Debugging > Symbols > Search Locations section. Select the Download symbols from the Microsoft Symbol Servers checkbox. This option accesses symbols from the public Microsoft Symbol Server. You can add other symbol locations by selecting Add and update existing locations with Edit. You can change the loading order of the locations by using Move up and Move down.
- Select Symbol Settings, which opens the Tools (or Debug) > Options dialog to the Debugging > Symbols section. In the Symbol file (.pdb) search locations group, select Microsoft Symbol Servers. This option accesses symbols from the public Microsoft Symbol Server. You can add other symbol locations by selecting Add and update existing locations with Edit. You can change the loading order of the locations by using Move up and Move down. Select OK to apply your changes.