C#如何在数组中搜索索引以查找值

本文关键字：索引 查找 搜索 数组 | 更新日期: 2023-09-27 18:23:37

我一直在C#中摸索，到目前为止我做得很好，但我正在努力了解如何在多维数组中搜索索引。我有一个阵列，它是为每天生产的产品。这通过要求用户输入（使用InputBox）来显示每周每天制作的产品，例如，第1周周一=10只熊，周三=20只熊。第2周星期二=30，星期五=11，等等。我知道IndexOf，但这是为了找到给定值的索引。我想搜索索引，找到并显示值。

代码如下：

class Day
{
    private string monday;
    private string tuesday;
    private string wednesday;
    private string thursday;
    private string friday;
    public string Monday
    {
        get { return monday; }
        set { monday = value; }
    }
    public string Tuesday
    {
        get { return tuesday; }
        set { tuesday = value; }
    }
    public string Wednesday
    {
        get { return wednesday; }
        set { wednesday = value; }
    }
    public string Thursday
    {
        get { return thursday; }
        set { thursday = value; }
    }
    public string Friday
    {
        get { return friday; }
        set { friday = value; }
    }
}
private void btnSelect_Click(object sender, EventArgs e)
{
    Day[] week = new Day[4];
    //Week[0] = new Day(); Ask users for input box value
    E.g.Monday = Microsoft.VisualBasic.Interaction.InputBox("Enter the amount of products made on Monday for week 1", "Product Amount"),etc
    //Prints the amounts
    txtOutput.Text += "The product allocation is as follows:" + "'r'n" + "'r'n";
    txtOutput.Text += "                      Mon    Tue     Wed     Thu     Fri  'r'n";
    int weeknum = 0;
    //Iterates through and shows the values for each day of the week.
    foreach (Day days in week)
    {
        weeknum++;
        if (days != null)
        {
            txtOutput.Text += "Week " + weeknum + "         " + days.Monday + "          " + days.Tuesday + "         " + days.Wednesday + "          " + days.Thursday + "         " + days.Friday + "'r'n";
        }
    }
}

C#如何在数组中搜索索引以查找值

"我想搜索索引，找到并显示值。"

抱歉，我可能没有回答你的问题，但这听起来像是Dictionary的完美用例。

IDictionary<string, int> database = new Dictionary<string, int>
{
    {"Week1 Monday", 10},
    {"Week1 Wednesday", 20}
};
var userinput = "Week1 Monday";
int numberOfBears;
database.TryGetValue(userinput, out numberOfBears);
//numberOfBears = 10

有关更多信息，请参阅http://www.dotnetperls.com/dictionary

您需要使用array.GetLowerBound和array.GetUpperBound方法在数组中循环。Array.IndexOf和Array.FindIndex方法不支持多维数组。

例如：

string[,,] data = new string[3,3,3];
data.SetValue("foo", 0, 1, 2 );
for (int i = data.GetLowerBound(0); i <= data.GetUpperBound(0); i++)
    for (int j = data.GetLowerBound(1); j <= data.GetUpperBound(1); j++)
        for (int k = data.GetLowerBound(2); k <= data.GetUpperBound(2); k++)
            Console.WriteLine("{0},{1},{2}: {3}", i, j, k, data[i,j,k]);
You might also find the Array.GetLength method and Array.Rank property useful. I recommend setting up a small multidimensional array and using all these methods and properties to get an idea of how they work.

没有像array.Find（）.这样的多维数组内置函数

基本上有两种选择：创建自己的辅助方法并在那里实现通用搜索模式，或者生成与多维数组内容相关的域对象列表。我个人倾向于选择后一种选择。

如果你选择编写一个helper方法，它可能看起来（非常粗略）如下：

//你可以很容易地修改这个代码来处理3D阵列等。

public static class ArrayHelper
{
   public static object FindInDimensions(this object[,] target, 
   object searchTerm)
  {
    object result = null;
    var rowLowerLimit = target.GetLowerBound(0);
    var rowUpperLimit = target.GetUpperBound(0);
    var colLowerLimit = target.GetLowerBound(1);
    var colUpperLimit = target.GetUpperBound(1);
    for (int row = rowLowerLimit; row < rowUpperLimit; row++)
    {
        for (int col = colLowerLimit; col < colUpperLimit; col++)
        {
            // you could do the search here...
        }
    }
    return result;
}

}

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