如果您关心@Daap对已接受答案的注释，并且只能传递一次值，则可以尝试以下方法之一

bool TestRangeDistance (int numberToCheck, int bottom, int distance)
{
  return (numberToCheck >= bottom && numberToCheck <= bottom+distance);
}

//var t = TestRangeDistance(10, somelist.Count()-5, 10);

or

bool TestRangeMargin (int numberToCheck, int target, int margin)
{
  return (numberToCheck >= target-margin && numberToCheck <= target+margin);
}

//var t = TestRangeMargin(10, somelist.Count(), 5);

在c#中，关于速度和代码原的最佳解决方案，只有一次比较，没有约束检查，并且不会因溢出而容易出错:

public static bool IsInRange(int value, int min, int max) => (uint)(value - min) <= (uint)(max - min);

最小值和最大值包括在内。

编辑:提供了新的答案。 当我写这个问题的第一个答案时，我刚刚开始使用c#，事后我意识到我的“解决方案”是幼稚和低效的。

我最初的回答是: 我会选择更简单的版本:

' if(Enumerable.Range(1100).Contains(intInQuestion)){…DoStuff;} '

更好的方法

因为我还没有看到任何其他更有效的解决方案(至少根据我的测试)，我将再试一次。

新的和更好的方法，也适用于负范围:

// Returns true if x is in range [min..max], else false 
bool inRange(int x, int min=1, int max=100) => ((x - max)*(x - min) <= 0);

这可以用于正负范围，并且默认为

1 . . 100(包括)并使用x作为数字来检查，然后是由min和max定义的可选范围。

为好的措施添加例子

示例1:

// Returns true if x is in range [min..max], else false 
bool inRange(int x, int min=1, int max=100) => ((x - max)*(x - min) <= 0);

Console.WriteLine(inRange(25));
Console.WriteLine(inRange(1));
Console.WriteLine(inRange(100));
Console.WriteLine(inRange(25, 30, 150));
Console.WriteLine(inRange(-25, -50, 0));

返回:

True
True
True
False
True

示例2: 使用100000个1到150之间的随机整数的列表

// Returns true if x is in range [min..max], else false 
bool inRange(int x, int min=1, int max=100) => ((x - max)*(x - min) <= 0);

// Generate 100000 ints between 1 and 150
var intsToCheck = new List<int>();
var randGen = new Random();
for(int i = 0; i < 100000; ++i){
    intsToCheck.Add(randGen.Next(150) + 1);
}

var counter = 0;
foreach(int n in intsToCheck) {
    if(inRange(n)) ++counter;
}

Console.WriteLine("{0} ints found in range 1..100", counter);

返回:

66660 ints found in range 1..100

Execution Time: 0.016 second(s)

如果是为了验证方法参数，没有一个解决方案会抛出argumentoutofranceexception，并允许简单/适当地配置包含/排除的最小/最大值。

像这样使用

public void Start(int pos)
{
    pos.CheckRange(nameof(pos), min: 0);

    if (pos.IsInRange(max: 100, maxInclusive: false))
    {
        // ...
    }
}

我只是写出了这些漂亮的函数。它还具有对有效值没有分支(单个if)的优点。最难的部分是制作适当的异常消息。

/// <summary>
/// Returns whether specified value is in valid range.
/// </summary>
/// <typeparam name="T">The type of data to validate.</typeparam>
/// <param name="value">The value to validate.</param>
/// <param name="min">The minimum valid value.</param>
/// <param name="minInclusive">Whether the minimum value is valid.</param>
/// <param name="max">The maximum valid value.</param>
/// <param name="maxInclusive">Whether the maximum value is valid.</param>
/// <returns>Whether the value is within range.</returns>
public static bool IsInRange<T>(this T value, T? min = null, bool minInclusive = true, T? max = null, bool maxInclusive = true)
    where T : struct, IComparable<T>
{
    var minValid = min == null || (minInclusive && value.CompareTo(min.Value) >= 0) || (!minInclusive && value.CompareTo(min.Value) > 0);
    var maxValid = max == null || (maxInclusive && value.CompareTo(max.Value) <= 0) || (!maxInclusive && value.CompareTo(max.Value) < 0);
    return minValid && maxValid;
}

/// <summary>
/// Validates whether specified value is in valid range, and throws an exception if out of range.
/// </summary>
/// <typeparam name="T">The type of data to validate.</typeparam>
/// <param name="value">The value to validate.</param>
/// <param name="name">The name of the parameter.</param>
/// <param name="min">The minimum valid value.</param>
/// <param name="minInclusive">Whether the minimum value is valid.</param>
/// <param name="max">The maximum valid value.</param>
/// <param name="maxInclusive">Whether the maximum value is valid.</param>
/// <returns>The value if valid.</returns>
public static T CheckRange<T>(this T value, string name, T? min = null, bool minInclusive = true, T? max = null, bool maxInclusive = true)
where T : struct, IComparable<T>
{
    if (!value.IsInRange(min, minInclusive, max, maxInclusive))
    {
        if (min.HasValue && minInclusive && max.HasValue && maxInclusive)
        {
            var message = "{0} must be between {1} and {2}.";
            throw new ArgumentOutOfRangeException(name, value, message.FormatInvariant(name, min, max));
        }
        else
        {
            var messageMin = min.HasValue ? GetOpText(true, minInclusive).FormatInvariant(min) : null;
            var messageMax = max.HasValue ? GetOpText(false, maxInclusive).FormatInvariant(max) : null;
            var message = (messageMin != null && messageMax != null) ?
                "{0} must be {1} and {2}." :
                "{0} must be {1}.";
            throw new ArgumentOutOfRangeException(name, value, message.FormatInvariant(name, messageMin ?? messageMax, messageMax));
        }
    }
    return value;
}

private static string GetOpText(bool greaterThan, bool inclusive)
{
    return (greaterThan && inclusive) ? "greater than or equal to {0}" :
        greaterThan ? "greater than {0}" :
        inclusive ? "less than or equal to {0}" :
        "less than {0}";
}

public static string FormatInvariant(this string format, params object?[] args) => string.Format(CultureInfo.InvariantCulture, format, args);

你的意思是?

if(number >= 1 && number <= 100)

or

bool TestRange (int numberToCheck, int bottom, int top)
{
  return (numberToCheck >= bottom && numberToCheck <= top);
}

我建议:

public static bool IsWithin<T>(this T value, T minimum, T maximum) where T : IComparable<T> {
    if (value.CompareTo(minimum) < 0)
       return false;
    if (value.CompareTo(maximum) > 0)
       return false;
    return true;
}

例子:

45.IsWithin(32, 89)
true
87.2.IsWithin(87.1, 87.15)
false
87.2.IsWithin(87.1, 87.25)
true

当然还有变量:

myvalue.IsWithin(min, max)

它易于阅读(接近人类语言)，并适用于任何可比类型(整数，双精度，自定义类型……)。

让代码易于阅读是很重要的，因为开发人员不会浪费“大脑周期”去理解它。在长时间的编码过程中，浪费的大脑周期会使开发人员更早地疲劳并容易出现错误。