You can use !DumpStackObjects and !DumpObj to explore an object’s internal structure.
CLR Internal - string object's internal structure
A string object’s CLR internal structure is:
[DWORD: SyncBlock][DWORD: MethodTable Pointer][DWORD: length as array][DWORD: length as string][WCHAR: 1st char]…[WCHAR: NULL]
From above screenshot, you can see that the SyncBlock: 80000000 Method table pointer is: 79330a00, m_arrayLength: 9, m_stringLength: 8, m_firstChar, …
!dumpobj 012c2b2c
Name: System.String
MethodTable: 79330a00
EEClass: 790ed64c
Size: 34(0x22) bytes
(C:\WINDOWS\assembly\GAC_32\mscorlib\2.0.0.0__b77a5c561934e089\mscorlib.dll)
String: abcdefgh
Fields:
MT Field Offset Type VT Attr Value Name
79332c4c 4000096 4 System.Int32 1 instance 9 m_arrayLength
79332c4c 4000097 8 System.Int32 1 instance 8 m_stringLength
793316e0 4000098 c System.Char 1 instance 61 m_firstChar
79330a00 4000099 10 System.String 0 shared static Empty
>> Domain:Value 0015d318:012c1198 <<
79331630 400009a 14 System.Char[] 0 shared static WhitespaceChars
>> Domain:Value 0015d318:012c1774 <<