说明
比较字符串并非比较字符串的长度, 而是比较字符串在英文字典中的位置.
字符在词典中从大到小的顺序为
ZzYy....BbAa9876543210
语法
比较字符串的语法有三种
-
String.Compare(S1,S2)
S1, S2为两个字符串, 从首字符开始比较, 如果S1>S2, 则返回数字1; 如果S1=S2,则返回数字 0; 如果S1<S2,则返回-1 -
S1.Compare(S2)
同上 -
S1.Equals(S2)
如果S1, S2为两个字符串字符相等,则返回数字 True ,否则返回False;
实例
using System;
namespace CsharpCode
{
class Program
{
static void Main(string[] args)
{
String S11 = "A";
String S12 = "B";
//Compare
int t = String.Compare(S11,S12);
Console.WriteLine(t);
//CompareTo
int j=S12.CompareTo(S11);
Console.WriteLine(j);
//Equals
bool bl;
bl = S11.Equals(S12);
Console.WriteLine(bl);
//from large to small: ZzYy....BbAa9876543210
String[] S1 ={"A","B","A","A","a","a","1A","A1","1A","2A"};
String[] S2 ={"B","A","a","b","A","a","A1","1A","2A","1A"};
for (int i=0;i<S1.Length;i++){
Console.WriteLine("Compare {0} with {1}: Resault = {2}",S1[i],S2[i],String.Compare(S1[i],S2[i]));
}
}
}
}
输出结果为
-1
1
False
Compare A with B: Resault = -1
Compare B with A: Resault = 1
Compare A with a: Resault = 1
Compare A with b: Resault = -1
Compare a with A: Resault = -1
Compare a with a: Resault = 0
Compare 1A with A1: Resault = -1
Compare A1 with 1A: Resault = 1
Compare 1A with 2A: Resault = -1
Compare 2A with 1A: Resault = 1
