可能重复：   How以确定是否一个小数/双为整数？中

我有double类型的变量，我想检查它是否是一个整数。

目前，我有

 公共BOOL CheckIfInteger（双号）
{
    返回number.ToString（）包含==假的。（。）;
}
 

有没有更好的办法？

更新：对不起，我没有意识到混淆的可能性，通过整我的意思是整数的数学definiton，那是自然数与非零自然数的底片

 返回Math.Truncate（号码）==号;
 

正如在评论中，你可能需要考虑到这样一个事实：双重新您的一些presentation可能不是一个准确的整数。在这种情况下，你需要允许一些保证金-的错误：

 双差异= Math.Abs​​（Math.Truncate（编号） - 数字）;
收益率（DIFF＆LT; 0.0000001）|| （DIFF＆GT; 0.9999999）;
 

Possible Duplicate: How to determine if a decimal/double is an integer?

I have a variable of type double and am wanting to check whether it is an integer.

At the moment I have

public bool CheckIfInteger(double number)
{
    return number.ToString().Contains(".") == false;
}

Is there a better way?

UPDATE: Sorry I didn't realise the potential for confusion, by integer I meant the mathematical definiton of integer, that is the natural numbers together with the negatives of the non-zero natural numbers.

return Math.Truncate(number) == number;

As mentioned in the comments, you might need to take account of the fact that a double representation of your number might not be an exact integer. In that case you'll need to allow for some margin-of-error:

double diff = Math.Abs(Math.Truncate(number) - number);
return (diff < 0.0000001) || (diff > 0.9999999);