C#字符串左不足位数时补充0的几种方式

int number = 123;
string result = number.ToString("D5"); // 结果将是 "00123"

int number = 123;
string result = number.ToString().PadLeft(5, '0'); // 结果也是 "00123"

int number = 123;
string result = string.Format("{0:00000}", number); // 结果同样是 "00123"

int number = 123;
string result = $"{number:D5}"; // 结果依然为 "00123"

string num= "23";
Console.WriteLine(string.Format("{0:d5}", num));
Console.WriteLine(string.Format("{0:d5}", 24));
Console.WriteLine(25.ToString("D5"));
Console.ReadKey();

string a = "24";
string b = "24.5";
Console.WriteLine(a.ToString().PadLeft(3,'0'));   //向左补齐
Console.WriteLine(25.ToString().PadLeft(3,'0'));   //向左补齐
Console.WriteLine(b.ToString().PadLeft(5,'0'));   //向左补齐
Console.WriteLine(25.5.ToString().PadLeft(5,'0'));   //向左补齐
Console.ReadKey();

string a = "25";
Console.WriteLine(a.ToString().PadRight(3,'0'));   //向右补齐
Console.ReadKey();