Visual Studio C＃if语句在调试中不起作用

Question

So I have a weird situation, where I get to an if statement while debugging, and I'm finding that even though EM=="M" , my if statement if(EM=="E") is being entered anyway... I'm also noticing that some of my code seems to be just getting skipped over when I'm stepping though the code(F11).

I'm using C# in VS2015 and VS2017, it's having the issue in both versions. I was using Framework 4.5, I had switched it to 4.6.1 to build a compatible version for a different program. But switching that back didn't change anything...

public static string EM = "";
Database db = doc.Database;
    //db.measureunits is 0 or 1
    if (db.measureunits == 1)  // english
    {
      EM = "E";
    }
    else   // metric
    {
      EM = "M";
    }
try
{
  if (EM == "E") //If english
  {  <-- Breakpoint STOPS Here EM is equal to "M" at this point, which shouldn't allow the break point to be hit, since EM("M")!="E"
    topText.TextString = rad + "\" minimum bend radius";
  }
  if (EM == "M") //Metric
  {  <-- Breakpoint never stops Here
    topText.TextString = Convert.ToString(Math.Round((Convert.ToDouble(rad)) * 0.3048, 2)) + "\" minimum bend radius";
  }
}
catch (IOException e)
{
      // Extract some information from this exception, and then   
      // throw it to the parent method.  
      if (e.Source != null)
        System.Windows.Forms.MessageBox.Show($"IOException source: {0}", e.Source);
      throw;
}  

If anyone else is aware of this issue or know's what I may be doing wrong, help would be appreciated.

Answer 1

The following workaround might be helpful

1. Delete bin and obj folder then re-build.

2. Restart Visual Studio OR PC

Answer 2

A few ideas.

• There occures an exception so that it jumps over the code which is coming after. Press Ctrl + Alt + E and check "Common Language Runtime Exceptions". Now it should stop at the moment an exception occures and show it to you.
• Your code was optimized during build. Try to build in debug mode or uncheck "optimize code" in the project properties under "Build".
• Delete the obj and bin folders. You already tried this.
• There is something fishy with the PDB file. The PDB file contains information for the debugger. Project properties -> build -> advanced => set "Debug Info:" to "full" (if you use debug configuration this should already be the case) and rebuild the whole solution.