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public static class Common
{
//isDigit
public static bool isNumberic1(this string _string)
{
if (string.IsNullOrEmpty(_string))
return false;
foreach (char c in _string)
{
if (!char.IsDigit(c))
return false;
}
return true;
}
//vb isnumberic
public static bool isNumberic2(this string _string)
{
return !string.IsNullOrEmpty(_string) && Microsoft.VisualBasic.Information.IsNumeric(_string);
}
//try parese
public static bool isNumberic3(this string _string)
{
if (string.IsNullOrEmpty(_string))
return false;
int i = 0;
return int.TryParse(_string, out i);
}
//try catch
public static bool isNumberic4(this string _string)
{
if (string.IsNullOrEmpty(_string))
return false;
int i = 0;
try { int.Parse(_string); }
catch { return false; }
return true;
}
//regex
public static bool isNumberic5(this string _string)
{
return !string.IsNullOrEmpty(_string) && Regex.IsMatch(_string, "^\\d+$");
}
}
class Program
{
static void Main(string[] args)
{
Test("1234");
Test("1234a");
Test("a1234");
Test("");
Test(null);
}
static void Test(string str)
{
bool res1 = false, res2 = false, res3 = false, res4 = false, res5 = false;
Stopwatch wat = new Stopwatch();
wat.Start();
for (int i = 1; i < 100000; i++)
{
res1 = str.isNumberic1();
}
wat.Stop();
Console.WriteLine("isDigit {0}:{1},{2}", str, wat.ElapsedMilliseconds, res1);
wat.Reset();
wat.Start();
for (int i = 1; i < 100000; i++)
{
res2= str.isNumberic2();
}
wat.Stop();
Console.WriteLine("isNumberic {0}:{1},{2}", str, wat.ElapsedMilliseconds, res2);
wat.Reset();
wat.Start();
for (int i = 1; i < 100000; i++)
{
res3 = str.isNumberic3();
}
wat.Stop();
Console.WriteLine("try parse {0}:{1},{2}", str, wat.ElapsedMilliseconds, res3);
wat.Reset();
wat.Start();
for (int i = 1; i < 100000; i++)
{
res4 = str.isNumberic4();
}
wat.Stop();
Console.WriteLine("try catch {0}:{1},{2}", str, wat.ElapsedMilliseconds, res4);
wat.Reset();
wat.Start();
for (int i = 1; i < 100000; i++)
{
res5 = str.isNumberic5();
}
wat.Stop();
Console.WriteLine("regex {0}:{1},{2}", str, wat.ElapsedMilliseconds, res5);
Console.WriteLine();
}
}