C# - 如何确定类型是否为数字 [英] C# - how to determine whether a Type is a number

问题描述

有没有办法确定给定的 .Net 类型是否为数字?例如:System.UInt32/UInt16/Double 都是数字.我想避免 Type.FullName 上的长切换案例.

解决方案

试试这个:

Type type = object.GetType();bool isNumber = (type.IsPrimitiveImple && type != typeof(bool) && type != typeof(char));

<块引用>

基本类型有Boolean、Byte、SByte, Int16, UInt16, Int32, UInt32,Int64、UInt64、Char、Double 和单身的.

采用 Guillaume 的解决方案 再远一点:

public static bool IsNumericType(this object o){开关 (Type.GetTypeCode(o.GetType())){案例类型代码.字节:案例类型代码.SByte:案例类型代码.UInt16:案例类型代码.UInt32:案例类型代码.UInt64:案例类型代码.Int16:案例类型代码.Int32:案例 TypeCode.Int64:案例类型代码.十进制:案例 TypeCode.Double:案例 TypeCode.Single:返回真；默认:返回假；}}

用法:

int i = 32;i.IsNumericType();//真的string s = "Hello World";s.IsNumericType();//错误的

Is there a way to determine whether or not a given .Net Type is a number? For example: System.UInt32/UInt16/Double are all numbers. I want to avoid a long switch-case on the Type.FullName.

解决方案

Try this:

Type type = object.GetType();
bool isNumber = (type.IsPrimitiveImple && type != typeof(bool) && type != typeof(char));

The primitive types are Boolean, Byte, SByte, Int16, UInt16, Int32, UInt32, Int64, UInt64, Char, Double,and Single.

Taking Guillaume's solution a little further:

public static bool IsNumericType(this object o)
{   
  switch (Type.GetTypeCode(o.GetType()))
  {
    case TypeCode.Byte:
    case TypeCode.SByte:
    case TypeCode.UInt16:
    case TypeCode.UInt32:
    case TypeCode.UInt64:
    case TypeCode.Int16:
    case TypeCode.Int32:
    case TypeCode.Int64:
    case TypeCode.Decimal:
    case TypeCode.Double:
    case TypeCode.Single:
      return true;
    default:
      return false;
  }
}

Usage:

int i = 32;
i.IsNumericType(); // True

string s = "Hello World";
s.IsNumericType(); // False

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