c＃将字符串值转换为十进制的正确方法

Question

I need convert the any value in format "101.46" to decimal .

string s = "101.46";
decimal value = Convert.ToDecimal(s);

But the decimal final value is always 10146 . I need the format of the output value to be 101.46 as decimal

Answer 1

Convert.ToDecimal will use the currently executing thread's culture - and my guess is that in your case, that's a culture that uses , as the decimal separator rather than . . You just need to specify the right culture - which is often the invariant culture - that's almost always the right culture to use for any strings that are intended to be machine-readable. (You should use the invariant culture for creating such strings too.)

I'd generally recommend using the static Parse methods over Convert.ToXyz (as they're often more capable, and have TryParse options too), so while you could pass the invariant culture to Convert.ToDecimal , I'd use:

decimal value = decimal.Parse(text, CultureInfo.InvariantCulture);

Answer 2

您当前的区域性似乎使用,作为小数点分隔符，那么您可以使用：

decimal value = decimal.Parse(s, CultureInfo.InvariantCulture);

Answer 3

public static boolean isNumeric(String str)  
{  
  try  
  {  
    decimal d = decimal.parseDouble(str);  
  }  
  catch(NumberFormatException nfe)  
  {  
    return false;  
  }  
  return true;  
}

If you want to use regular expression you can use as below,

public static boolean isNumeric(String str)
{
  return str.matches("-?\\d+(\\.\\d+)?");  //match a number with optional '-' and decimal.
}

If function returns true then

if(isNumeric(Yourvalue)){
  decimal value = decimal.Parse(s, CultureInfo.InvariantCulture);
}