string[] str1 = { "abc", "bcd", "cde", "efg" };
string str2 = string.join(",", str1);
string str3 = string.join("_", str1);
console.writeline("str2: {0}\nstr3: {1}" , str2, str3);
console.readkey();
输出结果：
黄山市民网：https://www.huangshanshimin.com/
string[] str1 = { "abc", "bcd", "cde", "efg" };
string str2 = string.join(",", str1);
string str3 = string.join("_", str1);
console.writeline("str2: {0}\nstr3: {1}" , str2, str3);
console.readkey();
输出结果：
