是否是数字

/// <summary>
/// 是否是数字(能转换为Double的数据)
/// </summary>
/// <param name="value"></param>
/// <returns></returns>
public static bool IsNumeric(object value)
{
bool result = true;
if (value == null)
{
return false;
}
else if (value is string)
{
if (value.ToString() == "")
{
return false;
}
else
{
Regex regex = new Regex(@"^[+-]?/d+[.]?/d*$");
result = regex.IsMatch(value.ToString());
if (result)
{
try
{
Convert.ToDouble(value);
}
catch
{
result = false;
}
}
else
{
return false;
}
}
}
else if (value is Int64 || value is decimal || value is double)
{
return true;
}
else
{
try
{
Convert.ToDouble(value);
}
catch
{
result = false;
}
}
return result;
}