如何创建一个创建新列表并采用其他参数的方法

本文关键字：创建 其他 参数 列表 方法 新列表 何创建 一个 | 更新日期: 2023-09-27 18:36:19

有没有办法创建一个Method，创建一个List的新实例作为Method Parameter并对新List做一些事情？

    private void ApplyMaxValue(List<double> list, double myDouble, Border border) 
    {
        list = new List<double>();
        list.Add(myDouble * 8);
        border.Width = list.Max();
    }

我希望能够在Method中创建someListToCreate而不是使用现有列表的地方传递这样的值。 

    ApplyMaxValue(someListToCreate, aDouble, myBorder);

我对 C# 仍然有点陌生，不确定Methods是否能够做到这一点，或者我是否需要创建一个Class。

编辑

带有方法演示的代码

<Window x:Class="NewListSample.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="500" Width="525">
    <Grid>
        <StackPanel Margin="20">
            <StackPanel Orientation="Horizontal" VerticalAlignment="Bottom">
            <Border x:Name="borderForArray1" BorderThickness="1" Height="1" HorizontalAlignment="Left" Width="20" Background="#FFF57F7F" VerticalAlignment="Bottom"/>
                <Border  x:Name="borderForArray2" BorderThickness="1" Height="1" HorizontalAlignment="Left" Width="20" Background="#FF6FA8D6" VerticalAlignment="Bottom"/>
                <Border x:Name="borderForArray3" BorderThickness="1" Height="1" HorizontalAlignment="Left" Width="20" Background="#FFEEB382" VerticalAlignment="Bottom"/>
                <Border x:Name="borderForArray4" BorderThickness="1" Height="1" HorizontalAlignment="Left" Width="20" Background="#FFB171E6" VerticalAlignment="Bottom"/>
        </StackPanel>
            <Button Content="Generate" HorizontalAlignment="Left" Padding="8,3" Margin="0,5,0,0" Click="Button_Click"/>
            <Button Content="Method" HorizontalAlignment="Left" Padding="8,3" Margin="0,5,0,0" Click="Button_Click_1" />
            <Button Content="Clear" HorizontalAlignment="Left" Padding="8,3" Margin="0,5,0,0" Click="Button_Click_2"/>
        </StackPanel>
    </Grid>
</Window>

.CS

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace NewListSample
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
        string[] array1 = { "This is a word.", "This is a sentence.", "This is short.", "This is." };
        string[] array2 = { "This is a word.", "This is a very very very very long sentence.", "This is the longest sentence in this array along with all other arrays in this sample.", "This is a string." };
        string[] array3 = { "This.", "That.", "Those.", "These.", "Slightly longer string." };
        string[] array4 = { "a.", "b.", "c.", "defg." };

        //Prevent from writing this code
        List<double> list1 = new List<double>();
        List<double> list2 = new List<double>();
        List<double> list3 = new List<double>();
        List<double> list4 = new List<double>();
        //Prevent code end

        //Method to prevent writing longer code
        private void ApplyMaxValue(string[] array, Border border)
        {
            List<double> someList = new List<double>();
            foreach (string s in array)
            {
                someList.Add(s.Length * 3);
            }
            border.Height = someList.Max();
        }
        private void Button_Click(object sender, RoutedEventArgs e)
        {
            foreach (string s in array1)
            {
                list1.Add(s.Length * 3);
            }
            foreach (string s in array2)
            {
                list2.Add(s.Length * 3);
            }
            foreach (string s in array3)
            {
                list3.Add(s.Length * 3);
            }
            foreach (string s in array4)
            {
                list4.Add(s.Length * 3);
            }
            borderForArray1.Height = list1.Max();
            borderForArray2.Height = list2.Max();
            borderForArray3.Height = list3.Max();
            borderForArray4.Height = list4.Max();
        }
        private void Button_Click_1(object sender, RoutedEventArgs e)
        {
            ApplyMaxValue(array1, borderForArray1);
            ApplyMaxValue(array2, borderForArray2);
            ApplyMaxValue(array3, borderForArray3);
            ApplyMaxValue(array4, borderForArray4);
        }
        private void Button_Click_2(object sender, RoutedEventArgs e)
        {
            borderForArray1.Height = borderForArray2.Height = borderForArray3.Height = borderForArray4.Height = 1;
        }
    }
}

如何创建一个创建新列表并采用其他参数的方法

听起来你应该返回列表引用，而不是将其用作参数 - 否则，你在方法主体的第一个语句中为它分配一个不同的值这一事实使它毫无意义：

private List<double> ApplyMaxValue(double myDouble, Border border) 
{
    List<double> list = new List<double>();
    list.Add(myDouble * 8);
    border.Width = list.Max();
    return list;
}

诚然，当唯一的元素是myDouble时，我不清楚为什么你会在这里使用list.Max()......

如果您的意思是要接受列表作为方法参数，但不需要创建新列表，则可以使用：

private void ApplyMaxValue(List<double> list, double myDouble, Border border) 
{
    list.Add(myDouble * 8);
    border.Width = list.Max();
}

目前还不完全清楚为什么你想要一种方法来做到这一点 - 感觉它实际上没有一个责任。但它至少会起作用...

您不必将列表作为参数传递

private void ApplyMaxValue(double myDouble, Border border) 
{
    List<double> list = new List<double>();
    list.Add(myDouble * 8);
    border.Width = list.Max();
}

如果要在使用此方法后使用该列表，则可以使用：

private List<double> ApplyMaxValue(double myDouble, Border border) 
{
    List<double> list = new List<double>();
    list.Add(myDouble * 8);
    border.Width = list.Max();
    return list
}
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