1

有没有办法创建 aMethod来创建 a 的新实例ListaMethod Parameter并用 new 做一些事情List？

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

我希望能够传递这样的值someListToCreate，Method而不是使用现有列表。

    ApplyMaxValue(someListToCreate, aDouble, myBorder);

我对 C# 还是有点陌生​​，不确定是否Methods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;
        }

    }
}
4

2 回答 2

4

听起来您应该返回列表引用，而不是将其用作参数 - 否则您在方法主体的第一条语句中为其分配不同值的事实使其毫无意义：

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，list.Max()当唯一的元素是myDouble......时，为什么你会在这里使用对我来说并不明显

如果你的意思是你想接受一个列表作为方法参数，但你不需要创建一个新列表，你可以使用：

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

仍然不完全清楚为什么你想要一种方法来做到这一点 - 感觉它并没有真正的责任。但它至少会起作用......

于 2013-10-20T15:06:19.867 回答
2

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();
}

如果您想在使用此方法后使用列表，您可以使用：

private List<double> ApplyMaxValue(double myDouble, Border border) 
{
    List<double> list = new List<double>();
    list.Add(myDouble * 8);
    border.Width = list.Max();
    return list
}
于 2013-10-20T15:10:39.770 回答