staticvoid Main(
string
[] args)
{
string
s =
""
;
s =
"ABCD"
;
Console.WriteLine(s[0]);
Console.WriteLine(s.Length);
Console.WriteLine();
s =
"ABCD"
;
char
[] arr = s.ToCharArray();
Console.WriteLine(arr[0]);
Console.WriteLine();
s =
"ABCD"
;
Console.WriteLine(s.Substring(1));
Console.WriteLine(s.Substring(1, 2));
Console.WriteLine();
s =
"ABCABCD"
;
Console.WriteLine(s.IndexOf(
'A'
));
Console.WriteLine(s.IndexOf(
"BCD"
));
Console.WriteLine(s.LastIndexOf(
'C'
));
Console.WriteLine(s.LastIndexOf(
"AB"
));
Console.WriteLine(s.IndexOf(
'E'
));
Console.WriteLine(s.Contains(
"ABCD"
));
Console.WriteLine();
s =
"aBcD"
;
Console.WriteLine(s.ToLower());
Console.WriteLine(s.ToUpper());
Console.WriteLine();
s =
"ABCD"
;
Console.WriteLine(s.PadLeft(6,
'_'
));
Console.WriteLine(s.PadRight(6,
'_'
));
Console.WriteLine();
s =
"__AB__CD__"
;
Console.WriteLine(s.Trim(
'_'
));
Console.WriteLine(s.TrimStart(
'_'
));
Console.WriteLine(s.TrimEnd(
'_'
));
Console.WriteLine();
s =
"ADEF"
;
Console.WriteLine(s.Insert(1,
"BC"
));
Console.WriteLine(s);
Console.WriteLine(s.Remove(1));
Console.WriteLine(s);
Console.WriteLine(s.Remove(0, 2));
Console.WriteLine();
s =
"A_B_C_D"
;
Console.WriteLine(s.Replace(
'_'
,
'-'
));
Console.WriteLine(s.Replace(
"_"
,
""
));
Console.WriteLine();
s =
"AA,BB,CC,DD"
;
string
[] arr1 = s.Split(
','
);
Console.WriteLine(arr1[0]);
Console.WriteLine(arr1[1]);
Console.WriteLine(arr1[2]);
Console.WriteLine(arr1[3]);
Console.WriteLine();
s =
"AA--BB--CC--DD"
;
string
[] arr2 = s.Replace(
"--"
,
"-"
).Split(
'-'
);
Console.WriteLine(arr2[0]);
Console.WriteLine(arr2[1]);
Console.WriteLine(arr2[2]);
Console.WriteLine(arr2[3]);
Console.WriteLine();
Console.WriteLine(
string
.Format(
"{0} + {1} = {2}"
, 1, 2, 1+2));
Console.WriteLine(
string
.Format(
"{0} / {1} = {2:0.000}"
, 1, 3, 1.00/3.00));
Console.WriteLine(
string
.Format(
"{0:yyyy年MM月dd日}"
, DateTime.Now));
s =
"A,B,C,D"
;
string
[] arr3 = s.Split(
','
);
Console.WriteLine(
string
.Concat(arr3));
Console.WriteLine(
string
.Join(
","
, arr3));
StringBuilder sb =
new
StringBuilder();
sb.Append(
"A"
);
sb.Append(
'B'
);
Console.WriteLine(sb.ToString());
Console.ReadKey();
}