关于 string和StringBuilder的区别参考MSDN。本文用程序演示它们在内存中的区别，及其因此其行为不同。
//Demo string memory model
namespace ConsoleApplication2
{
class Program
{
static void Main(string[] args)
{
string a = "1234";
string b = a;//a,and b point to the same address
Console.WriteLine(a);
Console.WriteLine(b);
a = "5678";
Console.WriteLine(a);
Console.WriteLine(b);//That b's value is not changed means string's value cann't be changed
Console.ReadKey();
}
}
}
output:
1234
1234
5678;change a's value,b's value is not changed
1234
//Demo StringBuilder's memory model
namespace ConsoleApplication3
{
class Program
{
static void Main(string[] args)
{
StringBuilder a = new StringBuilder("1234");
StringBuilder b = new StringBuilder();
b = a;
a.Clear();
a.Append("5678");
Console.WriteLine(a);
Console.WriteLine(b);
Console.ReadKey();
}
}
}
output:
5678
5678