检查如果对象是一个数字,在C# [英] Checking if an object is a number in C#
问题描述
我要检查,如果对象是一个号码,以便的ToString()
将导致包含数字和字符串+
, -
,
I'd like to check if an object is a number so that .ToString()
would result in a string containing digits and +
,-
,.
是否有可能通过简单的类型在.NET中检查(如:如果(p是号码)
)?
Is it possible by simple type checking in .net (like: if (p is Number)
)?
或者我应该转换为字符串,然后尝试解析翻番?
Or Should I convert to string, then try parsing to double?
更新::要澄清我的目标是INT,UINT,浮点型,双,等它不是一个字符串。 我试图让这将任何对象序列化到XML这样的功能:
Update: To clarify my object is int, uint, float, double, and so on it isn't a string. I'm trying to make a function that would serialize any object to xml like this:
<string>content</string>
或
<numeric>123.3</numeric>
或引发异常。
or raise an exception.
推荐答案
您只需要简单地做一个类型检查的每个基本数字类型。
You will simply need to do a type check for each of the basic numeric types.
下面是应该做的工作扩展方法:
Here's an extension method that should do the job:
public static bool IsNumber(this object value)
{
return value is sbyte
|| value is byte
|| value is short
|| value is ushort
|| value is int
|| value is uint
|| value is long
|| value is ulong
|| value is float
|| value is double
|| value is decimal;
}
本应涵盖所有的数字类型。
This should cover all numeric types.
看来你真的想deserialisation期间解析从字符串的数量。在这种情况下,它很可能只是最好使用 double.TryParse
。
It seems you do actually want to parse the number from a string during deserialisation. In this case, it would probably just be best to use double.TryParse
.
string value = "123.3";
double num;
if (!double.TryParse(value, out num))
throw new InvalidOperationException("Value is not a number.");
当然,
,这不会处理非常大的整数/长小数,但如果这是你只需要额外调用添加到 long.TryParse
/ <的情况下code> decimal.TryParse /任何其他人。
Of course, this wouldn't handle very large integers/long decimals, but if that is the case you just need to add additional calls to long.TryParse
/ decimal.TryParse
/ whatever else.
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