从月份数组中获取一系列值

本文关键字：获取 一系列 数组 | 更新日期: 2023-09-27 18:13:00

我创建了一个数组[Framework version 2.0, c# 2.0]来存储一年中的月份，如下所示

来源
public readonly static string[] Months = { "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" };

我正在寻找一种方法来检索从这个静态列表返回range of months的IEnumerable。我可以想到很多方法，但我在这里找到一个让我去wahhhhhh…方法的签名看起来像

签名

public IEnumerable<String> GetRange(int startIndex,int endIndex);

样本I/O 

startindex = 1
endindex = 10
returns months from January ,February,March upto October

注意: Array.Copy是整洁的，但使用参数的方式使它变得古怪

Parameters
sourceArray
    The Array that contains the data to copy.
sourceIndex
    A 32-bit integer that represents the index in the sourceArray at which copying begins.
destinationArray
    The Array that receives the data.
destinationIndex
    A 32-bit integer that represents the index in the destinationArray at which storing begins.
length
    A 32-bit integer that represents the number of elements to copy.

从月份数组中获取一系列值

如果你想使用Array。复制，你可以这样做:

public IEnumerable<String> GetRange(int startIndex, int endIndex)
{
    int numToCopy = endIndex - startIndex + 1;
    string[] result = new string[numToCopy];
    Array.Copy(Months, startIndex - 1, result, 0, numToCopy); // startIndex - 1 because Array indexes are 0-based, and you want the first element to be indexed with 1
    return result;
}

我要感谢每一个花心思回答我问题的人- Thanks下面是我使用Inhouse对象

的代码

在

范围内读取
public static IEnumerable<string> GetRange(short startIndex, short endIndex)
    {
        /*Cases
         * end > start
         * end > bounds
         * start < bounds
         * start != end
         */
        if (startIndex > endIndex || endIndex > Months.Length || startIndex < 0 || startIndex == endIndex)
        {
            throw new ArgumentOutOfRangeException("startIndex", "Invalid arguments were supplied for Start and End Index");
        }
        for (int rangeCount = startIndex-1; rangeCount < endIndex; rangeCount++)
        {
            yield return Months[rangeCount];
        }
    }

从给定索引一直取到末尾

public static IEnumerable<string> GetFrom(int startIndex)
{
    if (startIndex < 0 || startIndex > Months.Length - 1)
    {
        throw new ArgumentOutOfRangeException("startIndex", "Start Index cannot be greater than the Bounds of the months in year");
    }
    for (int rangeCount = startIndex - 1; rangeCount < Months.Length; rangeCount++)
    {
        yield return Months[rangeCount];
    }
}

我想知道我是否可以在范围内使用fetch方法从索引方法中获取。

您可以使用Skip和Take扩展方法:

public IEnumerable<String> GetRange(int startIndex, int endIndex)
{
    return months.Skip(startIndex).Take(endIndex - startIndex + 1);
}

(可能需要为基于1的索引进行调整)

下面的内容适合您吗?

    public static IEnumerable<String> GetRange(int startIndex, int endIndex)
    {
        List<string> rv = new List<string>();
        for (int i=startIndex+1;i<=endIndex;i++)
            rv.Add(System.Globalization.DateTimeFormatInfo.CurrentInfo.GetMonthName(i));
        return rv;
    }
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