Single.CompareTo()方法用于将当前实例与指定对象或另一个Single实例进行比较，并返回一个整数，该整数显示当前实例的值是大于，等于还是小于指定的值。对象或其他Single实例。此方法的重载列表中有2种方法，如下所示：
- CompareTo(Single)方法
- CompareTo(Object)方法
Single.CompareTo(Single)方法
此方法用于将当前实例与指定的单精度浮点数进行比较，并返回一个整数，该整数指示此实例的值是否小于，等于或大于指定的单精度浮点的值。点数。
句法：
public int CompareTo (float value);在这里，需要一个单精度浮点数进行比较。
返回值：返回一个32位带符号的数字，指示当前实例和value参数的相对值，如下所示：
- 小于零：如果Current Instance
NaN )并且value是一个数字。 - 零：如果Current Instance = value或当前实例和value都不是数字( NaN )， PositiveInfinity或NegativeInfinity 。
- 大于零：如果Current Instance> value或当前实例是一个数字，而value不是一个数字( NaN )。
下面的程序说明了Single.CompareTo(Single)方法的用法：
范例1：
// C# program to demonstrate the
// Single.CompareTo(Single) Method
using System;
class GFG {
// Main Method
public static void Main()
{
// Declaring and initializing value1
float value1 = 10.5f;
// Declaring and initializing value2
float value2 = 20.6f;
// compare both the values
// using CompareTo() method
int status = value1.CompareTo(value2);
// checking the status
if (status > 0)
Console.WriteLine("{0} is greater than {1}",
value1, value2);
else if (status < 0)
Console.WriteLine("{0} is less than {1}",
value1, value2);
else
Console.WriteLine("{0} is equal to {1}",
value1, value2);
}
}
输出：
10.5 is less than 20.6
范例2：
// C# program to demonstrate the
// Single.CompareTo(Single) Method
using System;
class GFG {
// Main Method
public static void Main()
{
// calling get() method
get(5.4f, 7.5f);
get(30.4f, 20.3f);
get(10.4f, 10.4f);
get(7.2f, -12.3f);
}
// defining get() method
public static void get(float value1,
float value2)
{
// using CompareTo() method
int status = value1.CompareTo(value2);
// checking the status
if (status > 0)
Console.WriteLine("{0} is greater than {1}",
value1, value2);
else if (status < 0)
Console.WriteLine("{0} is less than {1}",
value1, value2);
else
Console.WriteLine("{0} is equal to {1}",
value1, value2);
}
}
输出：
5.4 is less than 7.5
30.4 is greater than 20.3
10.4 is equal to 10.4
7.2 is greater than -12.3
Single.CompareTo(Object)方法
此方法用于将当前实例与指定对象进行比较，并返回一个整数，该整数显示当前实例的值是小于，等于还是大于指定对象的值。
句法：
public int CompareTo (object value);在这里，它需要对象与该实例进行比较，或者为null。
返回值：返回一个32位带符号的数字，指示当前实例和value参数的相对值，如下所示：
- 小于零：如果Current Instance
NaN )并且value是一个数字。 - 零：如果Current Instance = value或当前实例和value都不是数字( NaN )， PositiveInfinity或NegativeInfinity 。
- 大于零：如果Current Instance> value或当前实例是一个数字，而value不是一个数字( NaN )。
异常：如果value不是Single ，则抛出ArgumentException 。
下面的程序说明了Single.CompareTo(Object)方法的用法
范例1：
// C# program to demonstrate the
// Single.CompareTo(Object) Method
using System;
class GFG {
// Main Method
public static void Main()
{
try {
// Declaring and initializing value1
float value1 = 10.4f;
// Declaring and initializing value2
object value2 = 10.5f;
// compare both the value
// using CompareTo() method
int status = value1.CompareTo(value2);
// checking the status
if (status > 0)
Console.WriteLine("{0} is greater than {1}",
value1, value2);
else if (status < 0)
Console.WriteLine("{0} is less than {1}",
value1, value2);
else
Console.WriteLine("{0} is equal to {1}",
value1, value2);
}
catch (ArgumentException e)
{
Console.WriteLine("value2 must be Single");
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
}
}
输出：
10.4 is less than 10.5
示例2：对于ArgumentException
// C# program to demonstrate the
// Single.CompareTo(object) Method
using System;
using System.Globalization;
class GFG {
// Main Method
public static void Main()
{
try {
// Declaring and initializing value1
float value1 = 10;
// Declaring and initializing value2
object value2 = 1 / 3;
// using CompareTo() method
int status = value1.CompareTo(value2);
// checking the status
if (status > 0)
Console.WriteLine("{0} is greater than {1}",
value1, value2);
else if (status < 0)
Console.WriteLine("{0} is less than {1}",
value1, value2);
else
Console.WriteLine("{0} is equal to {1}",
value1, value2);
}
catch (ArgumentException e)
{
Console.WriteLine("value2 must be Single");
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
}
}
输出：
value2 must be Single
Exception Thrown: System.ArgumentException
参考：
- https://docs.microsoft.com/zh-cn/dotnet/api/system.single.compareto?view=netstandard-2.1