[Original] bug report, submitted to Microsoft. When the Platform calls debugging, it cannot perform a single-step error on the unmanaged function.

Detailed description:

First, declare the unmanaged functions:

[Dllimport ("nativelib. dll", charset = charset. Unicode, callingconvention = callingconvention. cdecl)]

Private extern static void teststringargumentsfixlength (string instring, stringbuilder outstring, int buffersize );

 

Then select"Enable unmanaged code debugging"

 

 

Write as follows:CodeTest:

Private Static void teststringargumentsfixlength ()

{

String instring = "this is a input string .";

 

Int buffersize = instring. length;

Stringbuilder sb = new stringbuilder (buffersize );

 

Teststringargumentsfixlength (instring, Sb, buffersize + 1 );

 

Console. writeline ("Original: {0}", instring );

Console. writeline ("Copied: {0}", SB. tostring ());

}

 

Click the breakpoint in the red line and pressF11You can step into an unmanaged function.

 

However, if you modify it:

Private Static void teststringargumentsfixlength ()

{

String instring = "this is a input string .";

 

Int buffersize = instring. length;

Stringbuilder sb = new stringbuilder (buffersize );

 

//If the last parameter of the above function call isStringbuilderSpecifies the attributes of an object.

//Although the running result is correct, the debugger

//The Code cannot be executed in a single step. This may be. NET FrameworkSmallBug.

Teststringargumentsfixlength (instring, Sb,SB. Capacity + 1);

 

Console. writeline ("Original: {0}", instring );

Console. writeline ("Copied: {0}", SB. tostring ());

}

 

Click the breakpoint in the red line and pressF11In any case, you cannot step into an unmanaged function.

 

 

Test environment:

Windows Server 2008

Windows Vista Enterprise

Windows XP SP2

 

Development tools:

Microsoft Visual maxcompute 2005

Version 8.0.50727.42RTM.050727-4200)

Microsoft. NET Framework

Version 2.0.50727 SP1

 

 

YesSource codeIf you try it yourself, please download:

Source code