I am trying to configure visual studio to enable me to step into the .net framework source code when I am debugging.
I have tried with both Visual Web-Developer-Express-2010 and Visual-Studio-2011-Express-For-Web as well as Visual-Studio-2011-Express-For-Web on Win8CP and I am getting the same problem with each.
I have read numerous tutorials on how to set it up and the settings I have I believe to be correct.
Debugging General Settings -
also -
Debugging Symbol Settings -
I have tried both of these symbol servers. When I click Load all Symbols this is the output I get saying symbol loads have failed -
If I run the code to the breakpoint, right click and select the specific method to step into like so -
I get this tab -
If I look in my SymbolCache folder, there is only a FailedLoads folder with these contents -
My project is in debug mode. I have also tried running VS as administrator. I have full control over the SymbolCache directory. I am on a home network and have full access to my internet connection.
Why is this not working?
Source stepping is only available for RTM or SP releases.
Since 4.5 assemblies keep the same version number as 4.0 (stupid idea), then there is no way to get compatible symbols + source right now, so this is impossible with VS11 installed. You must start over with a clean machine and don't install .NET 4.5.
This is really stupid … the whole point of versioning just thrown out the window.
Have you set up the environment to load the symbols (note: by default, the symbols are not set to load - have not checked VS 11, btw (will do so later)).
You can also check out this article for info on symbols. I will have to check if there is a manual download for symbols for .NET.
You can also set up source server manually to http://referencesource.microsoft.com/symbols. You cannot browse the reference source.
I had this problem - no symbols loading - and spent a week trying to solve it. My problem was that I had for the first time started using Master pages in my website project. And I was incorrectly creating the content pages; the error was that i was not indicating the codebehind file in the page directive of the content page so my codebehind file was in essence unconnected to the build of the project. A dumb mistake and simple fix after a week of frustration. Hope this helps some lost programming soul stuck with the same problem.
来源：https://stackoverflow.com/questions/9778159/debug-symbols-not-loading