string test

  • Thread starter Thread starter Green
  • Start date Start date
G

Green

Hi, All
According to C#.Net

string s = "foo";
string z = "foo";

s and z gonna share the same memory location, correct me if I am wrong. If
it is correct, how can I prove this. Is there any tool can show me the
memory location.

Thanks in advance!
 
Green said:
string s = "foo";
string z = "foo";

s and z gonna share the same memory location, correct me if I am wrong. If
it is correct, how can I prove this. Is there any tool can show me the
memory location.
Click to expand...

1) Why would you wan't to prove this?

2) object.ReferenceEquals(s,z)
 
Green said:
Hi, All
According to C#.Net

string s = "foo";
string z = "foo";

s and z gonna share the same memory location, correct me if I am wrong. If
it is correct, how can I prove this. Is there any tool can show me the
memory location.

Thanks in advance!
Click to expand...

s and z are different memory locations, they are the variables
(register/local allocated in this case) that contain the value of the
reference pointing to the GC heap allocated object of type string.

You can't take the contents of the variable, but you can take the address of
the first character of the string, so if you run following, you'll see that
both adresses are equal. When you change the contents of one of the strings,
you'll notice the addresses are different.

string a = "foo";
string b = "foo";

unsafe {
fixed (char* aa = a)
{
Console.WriteLine("{0:x}", (int)new IntPtr(aa));
}

fixed (char* aa = b)
{
Console.WriteLine("{0:x}", (int)new IntPtr(aa));
}
}

Willy.
 
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