str转成double?
2017-01-25 17:25:57 访问(1316) 赞(0) 踩(0)
/// <summary>
/// str转成double?
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
public double? DoubleNullByStr(string str)
{
if (str == null)
return null;
if (str.Length == 0)
return null;
str = str.Trim();
if (str.Length == 0)
return null;
double theResult = 0;
if (double.TryParse(str, out theResult))
return theResult;
return null;
}
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str转成double? 


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