Question

我创建了List allPackages。该列表实际上是包列表的列表。我需要能够单击主应用程序的ComboBox中的项目，从组合框列表中选择一个状态。选择状态后，如果List allPackages中包含包的包列表，我需要列表中每个包的Id字段显示在文本块或UI中的其他类型的工具中。当我尝试过，我没有成功地将访问的数据字段显示在UI中的任何类型的输出中。

我正在调查正在发生的事情，但我现在几乎陷入困境。就像当前运行的线程不允许我打印数据一样。当然，这必须是因为没有为某个类型的事件定义的方法，该方法在从ComboBox中选择项目时进行处理。我指的ComboBox是PkgsByStateCmbo。我几乎可以肯定这是事实。从发布的代码中，您将看到每个Package对象都有一个地址，Id，州，zip和一个城市。在UI中单击按钮并完成字段并验证输入后，可以将包添加到基于要添加的包的状态字段的包列表中。这给了我基于状态的列表。现在看，我确定我应该在代码中使用Linq语句而不是嵌套列表，但我仍然只在1列表中处于当前状态。

/** Package Class */
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CSC470_Lab6
{
    class Package
    {
        public string Id { get; set; }
        public string address { get; set;}
        public string state { get; set; }
        public int zip { get; set; }
        public string city { get; set; }
    }
}

/ **控制器类* /

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Collections;

namespace CSC470_Lab6
{
    class Controller
    {

        public List<List<Package>> allPackages = new List<List<Package>>();
        public string alI = "0";
        public string flI = "1";
        public string gaI = "2";
        public string kyI = "3";
        public string miI = "4";
        public string ncI = "5";
        public string scI = "6";
        public string tnI = "7";
        public string wvI = "8";
        public string vaI = "9";
        public int currentPkgCount = 0;
        public int initId = 10000;


        /**
         * Alabama, Florida, Georgia, Kentucky, Mississippi, North Carolina, South Carolina, Tennessee, West Virginia or Virginia.
         * */
        public List<Package> al = new List<Package>();
        public List<Package> fl = new List<Package>();
        public List<Package> ga = new List<Package>();
        public List<Package> ky = new List<Package>();
        public List<Package> mi = new List<Package>();
        public List<Package> nc = new List<Package>();
        public List<Package> sc = new List<Package>();
        public List<Package> tn = new List<Package>();
        public List<Package> wv = new List<Package>();
        public List<Package> va = new List<Package>();

        public void initMasterList()
        {
            allPackages.Add(al);
            allPackages.Add(fl);
            allPackages.Add(ga);
            allPackages.Add(ky);
            allPackages.Add(mi);
            allPackages.Add(nc);
            allPackages.Add(sc);
            allPackages.Add(tn);
            allPackages.Add(wv);
            allPackages.Add(va);

        }

        public Boolean masterListHasContent()
        {
            Boolean result = false;
            for (int i = 0; i < allPackages.Count; i++)
            {
                List<Package> temp = allPackages[i];
                if (temp[i] != null)
                { 
                    result = true;
                    break;
                }
            }
            return result;

        }

        public string[] getIds(List<Package> list)
        {
            string[] ids = null;
            for (int i = 0; i < list.Count; i++)
            {
                ids[i] = list[i].Id;
            }
            return ids;
        }

        public List<Package> getStateList(int state)
        {

            return allPackages[state];
        }

        public void setInitId(){

            initId++;
        }

        public int getInitId()
        {
            return initId;
        }


    }
}

/ ** MainWindow.xam.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 CSC470_Lab6
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        string[] states = new string[] { "AL", "FL", "GA", "KY", "MI", "NC", "SC", "TN", "WV", "VA" };
        Package theCurrentPackage;
        Controller controller = new Controller();
        public int zipcode;
        public MainWindow()
        {
            InitializeComponent();

            controller.initMasterList();



        }
        private void PkgsByStateCmbo_Click(object sender, RoutedEventArgs e)
        {
            if (PkgsByStateCmbo.SelectedIndex >= 0)
            {
                int index = PkgsByStateCmbo.SelectedIndex;
                List<Package> list = controller.getStateList(index);

                foreach (Package pkg in list)
                {
                    ByStateBlk.Text = pkg.Id + "\n";
                }

            }
        }

        private void ScanBtn_Click(object sender, RoutedEventArgs e)
        {
            theCurrentPackage = new Package();
            PkgIdBlk.IsEnabled = true;
            controller.setInitId();
            controller.getInitId();
            PkgIdBlk.Text = controller.getInitId().ToString();
            theCurrentPackage.Id = controller.getInitId().ToString();
            setPackageAddress();
            setCity();
            setState();
            setZip();
            AddBtn.IsEnabled = true;
            ErrorViewer.IsEnabled = true;
            ScanBtn.IsEnabled = false;
        }
        public int getZip()
        {
            zipcode = int.Parse(ZipTxt.Text);
            return zipcode;
        }
        public void setZip()
        {
            ZipTxt.Text = "";
            ZipTxt.IsEnabled = true;
        }
        public string getState()
        {
            int index;
            index = StateCmbo.SelectedIndex - 1;
            if (index >= 0)
                return states[index];
            else
                return "NVS";
        }
        public void setState()
        {

            StateCmbo.IsEnabled = true;
        }
        public void setCity()
        {
            CityTxt.Text = "";
            CityTxt.IsEnabled = true;
        }
        public string getCity()
        {
            return CityTxt.Text;
        }
        public void setPackageAddress()
        {
            AddressTxt.Text = "";
            AddressTxt.IsEnabled = true;

        }
        public string getPackageAddress()
        {
            return AddressTxt.Text;

        }


        private void AddBtn_Click(object sender, RoutedEventArgs e)
        {
            ScanBtn.IsEnabled = false;

            bool addr = checkAddress();
            bool cty = checkCity();
            bool ckst = checkState();
            bool chdz = checkZip();
            if((addr == true)&&(cty == true)&&(ckst == true)&&(chdz == true))

            {
                theCurrentPackage.address = getPackageAddress();
                theCurrentPackage.city = getCity();
                theCurrentPackage.zip = getZip();
                theCurrentPackage.state = getState();
                ErrorViewer.Content = "Package added";
                int index = StateCmbo.SelectedIndex - 1;
                controller.allPackages[index].Add(theCurrentPackage);
                theCurrentPackage = null;
                AddressTxt.Text = "";
                PkgIdBlk.Text = "";
                CityTxt.Text = "";
                ZipTxt.Text = "";
                ScanBtn.IsEnabled = true;
                StateCmbo.SelectedIndex = -1;
                StateCmbo.IsEnabled = false;
                PkgsByStateCmbo.IsEnabled = true;


            }
           else
            {

                ErrorViewer.Content = "Package add unsuccessful. Please check for errors and try again";
                PkgIdBlk.Text = "";
                AddressTxt.Text = "";
                CityTxt.Text = "";
                StateCmbo.SelectedIndex = -1;
                ZipTxt.Text = "";
                AddBtn.IsEnabled = false;
                ScanBtn.IsEnabled = true;
                theCurrentPackage = null;
            }

        }

        public bool checkState()
        {
            bool result = false;
            if (getState() != "NVS")
            {
                result = true;
            }
            return result;
        }

        public bool checkAddress()
        {
            bool result = false;
            string str = getPackageAddress();
            if (str != null)
                result = true;
            return result;
        }

        public bool checkCity()
        {
            bool result = false;
            string str = getCity();
            if (str != null)
                result = true;
            return result;
        }

        public bool checkZip()
        {
            bool result = false;

            char[] zip = zipcode.ToString().ToCharArray();
            for (int i = 0; i < zip.Length; i++)
            {
                int val = (int)Char.GetNumericValue(zip[i]);

                if ((val.Equals(0)) || (val.Equals(1)) || (val.Equals(2)) || (val.Equals(3)) || (val.Equals(4))|| (val.Equals(5)) || (val.Equals(6))|| (val.Equals(7))|| (val.Equals(8)) || (val.Equals(9)))
                {

                    result = true;
                    //return result;
                }
                else
                {
                    result = false;
                }
            }
            return result;
        }





    }           
}

<Window x:Class="CSC470_Lab6.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid IsEnabled="True">


        <Button x:Name="NextBtn" Content="Next &gt;" HorizontalAlignment="Left" VerticalAlignment="Top" Width="71" Margin="315,235,0,0" IsEnabled="False"/>
        <Button x:Name="ExitBtn" Content="Exit" HorizontalAlignment="Left" VerticalAlignment="Top" Width="44" Margin="266,235,0,0"/>
        <Button x:Name="RemoveBtn" Content="Remove" HorizontalAlignment="Left" VerticalAlignment="Top" Width="60" Margin="201,235,0,0" IsEnabled="False"/>
        <Button x:Name="AddBtn" Content="Add" HorizontalAlignment="Left" VerticalAlignment="Top" Width="48" Margin="148,234,0,0" IsEnabled="False" Click="AddBtn_Click"/>
        <Button x:Name="ScanBtn" Content="Scan New" HorizontalAlignment="Left" VerticalAlignment="Top" Width="72" Margin="71,234,0,0" Click="ScanBtn_Click"/>
        <Button x:Name="BackBtn" Content="&lt; Back" HorizontalAlignment="Left" Margin="10,234,0,0" VerticalAlignment="Top" Width="56" IsEnabled="False"/>
        <Grid x:Name="InnerGrid" HorizontalAlignment="Left" Height="135" Margin="10,94,0,0" VerticalAlignment="Top" Width="376">
            <Label x:Name="PackageIdLbl" Content="Package ID:" HorizontalAlignment="Left" Margin="0,14,0,0" VerticalAlignment="Top" IsEnabled="False"/>
            <Label x:Name="AddressLbl" Content="Address" HorizontalAlignment="Left" Margin="0,52,0,0" VerticalAlignment="Top" IsEnabled="False"/>
            <Label x:Name="CityLbl" Content="City" HorizontalAlignment="Left" Margin="0,93,0,0" VerticalAlignment="Top" IsEnabled="False"/>
            <Label x:Name="StateLbl" Content="State" HorizontalAlignment="Left" Margin="207,95,0,0" VerticalAlignment="Top" IsEnabled="False"/>
            <Label x:Name="ZipLbl" Content="Zip" HorizontalAlignment="Left" Margin="286,95,0,0" VerticalAlignment="Top" IsEnabled="False"/>
            <TextBox x:Name="CityTxt" HorizontalAlignment="Left" Height="23" Margin="87,99,0,0" TextWrapping="Wrap" Text="City_Text" VerticalAlignment="Top" Width="120" HorizontalContentAlignment="Center" IsEnabled="False"/>
            <TextBox x:Name="ZipTxt" HorizontalAlignment="Left" Height="23" Margin="318,97,0,0" TextWrapping="Wrap" Text="00000" VerticalAlignment="Top" Width="48" HorizontalContentAlignment="Center" IsEnabled="False"/>
            <ComboBox x:Name="StateCmbo" HorizontalAlignment="Left" Margin="244,98,0,0" VerticalAlignment="Top" Width="42" RenderTransformOrigin="1.614,0.47" IsEnabled="False">
                <ComboBoxItem x:Name="noSelection" Content=""/>
                <ComboBoxItem x:Name="al" Content="AL"/>
                <ComboBoxItem x:Name="fl" Content="FL"/>
                <ComboBoxItem x:Name="ga" Content="GA"/>
                <ComboBoxItem x:Name="ky" Content="KY"/>
                <ComboBoxItem x:Name="mi" Content="MI"/>
                <ComboBoxItem x:Name="nc" Content="NC"/>
                <ComboBoxItem x:Name="sc" Content="SC"/>
                <ComboBoxItem x:Name="tn" Content="TN"/>
                <ComboBoxItem x:Name="wv" Content="WV"/>
                <ComboBoxItem x:Name="va" Content="VA"/>
            </ComboBox>
            <TextBlock x:Name="PkgIdBlk" HorizontalAlignment="Left" Margin="87,19,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="279" />
            <TextBox x:Name="AddressTxt" HorizontalAlignment="Left" Height="23" Margin="87,53,0,0" TextWrapping="Wrap" Text="Address_Text" VerticalAlignment="Top" Width="279" HorizontalContentAlignment="Center" IsEnabled="False"/>
        </Grid>
        <GroupBox x:Name="PkgInfoGrp" Header="Package Information&#x9;&#x9;&#x9;&#x9;" HorizontalAlignment="Left" Margin="10,95,0,0" VerticalAlignment="Top" Height="140" Width="376" IsEnabled="True"/>
        <Label x:Name="ArrivedAtLbl" Content="Arrived At:" HorizontalAlignment="Left" Margin="10,63,0,0" VerticalAlignment="Top" Width="69" IsEnabled="False"/>
        <TextBlock x:Name="ArrivedAtTxtBlk" HorizontalAlignment="Left" Margin="99,68,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="130" />
        <GroupBox x:Name="PkgsByStateGrp" Header="Packages by state" HorizontalAlignment="Left" Margin="391,94,0,0" VerticalAlignment="Top" Height="160" Width="117" IsEnabled="True">
            <Grid HorizontalAlignment="Left" Height="100" Margin="0,38,-3,-0.4" VerticalAlignment="Top" Width="107">
                <TextBlock x:Name="ByStateBlk" HorizontalAlignment="Left" Margin="0,10,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Height="90" Width="107" Text="{Binding PkgsByStateCmbo, UpdateSourceTrigger=PropertyChanged}"/>
            </Grid>
        </GroupBox>
        <ComboBox x:Name="PkgsByStateCmbo" HorizontalAlignment="Left" Margin="420,122,0,0" VerticalAlignment="Top" Width="65" IsReadOnly="True" Height="23" IsEnabled="True" SelectedItem="{Binding allPackages[SelectedIndex].List.state, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}">
            <ComboBoxItem Content=""/>
            <ComboBoxItem Content="AL"/> 
            <ComboBoxItem Content="FL"/>
            <ComboBoxItem Content="GA"/>
            <ComboBoxItem Content="KY"/>
            <ComboBoxItem Content="MI"/>
            <ComboBoxItem Content="NC"/>
            <ComboBoxItem Content="SC"/>
            <ComboBoxItem Content="TN"/>
            <ComboBoxItem Content="WV"/>
            <ComboBoxItem Content="VA"/>
        </ComboBox>
        <ScrollViewer x:Name="ErrorViewer" HorizontalAlignment="Left" Height="47" Margin="10,264,0,0" VerticalAlignment="Top" Width="498"/>


    </Grid>
</Window>

Answer 1

让我先说一下，我没有示例Package类的内容，因此它基于假设。而我认为他们有名称和ID属性。除此之外，我还假设他们有独特的名字和id。这就是我使用FirstOrDefault（）的原因。

我会做以下事情：

private void ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e){
    //Get the selected combobox item
    ComboBoxItem selectedItem = (String)((ComboBox)sender).SelectedItem;

    //Get the string out of the combobox item
    String state = selectedItem.Content;

    //Get the packageId from the allpackages list
    Int64 packageId = (allPackages.Where(p => p.package.state.equals(state)).FirstOrDefault()).Id;

    //Put the number in the textbox
    PkgIdBlk.Text = packageId.ToString();
}

@Edit 13:30 22-07-2015

我读到有一个包列表的列表。（这将有助于获得包类。）在这种情况下，如果你想要一个id列表，将适用以下内容：

private void ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e){
    //Get the selected combobox item
    ComboBoxItem selectedItem = (String)((ComboBox)sender).SelectedItem;

    //Get the string out of the combobox item
    String state = selectedItem.Content;

    //Get the list of packages from the allpackages list where the name applies
    List<Package> packages = allPackages.Where(p => p.package.state.equals(state)).ToList();

    //create a string to fill with id's
    String idList = "";

    //Loop to the prior selected list to fill the string with id's
    foreach(Package p in packages){
        idList += p.ID + ", ";
    }

    //Put the numberlist in the textbox
    PkgIdBlk.Text = idList;
}

（您也可以使用StringBuilder类。但为了简单起见，我使用了String。）

@edit 22:34 23-07-2015 编辑了现在可用的包类的答案。（按州名称替换）

文本框为空的原因可能有多种原因，这里有三个;

String状态为空，由于某种原因没有使用SelectedItem.Content填充。这导致Linq查询没有结果。
Linq（where）查询没有结果。这意味着foreach循环不会向字符串idList添加任何内容？（请记住，equals语句区分大小写。）
将idList字符串设置为错误的文本框？

@edit 22:43 23-07-2015 我看到一个问题，这个：

    ComboBoxItem selectedItem = (String)((ComboBox)sender).SelectedItem;

应该是这样的：

    ComboBoxItem selectedItem = (ComboBoxItem)((ComboBox)sender).SelectedItem;

Answer 2

更正代码如下，我还评论说我将原始TextBlock更改为ListBox，这是解决方案的一部分。我还必须在PkgsByStateCombo_SelectionChanged方法中添加一个内部循环。

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 CSC470_Lab6
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        int startingIndex = 0;
        string[] states = new string[] { "AL", "FL", "GA", "KY", "MI", "NC", "SC", "TN", "WV", "VA" };
        Package theCurrentPackage;
        Controller controller = new Controller();
        List<Package> newList = new List<Package>();
        public int zipcode;
        public MainWindow()
        {
            InitializeComponent();
            PkgsByStateCmbo.ItemsSource = states;
            controller.initMasterList();
            for (int i = 0; i < controller.allPackages.Count; i++)
            {
                List<Package> lst = controller.allPackages[i];
                lst.Clear();
            }



        }


        private void ScanBtn_Click(object sender, RoutedEventArgs e)
        {
            ArrivedAtTxtBlk.IsEnabled = true;
            theCurrentPackage = new Package();
            PkgIdBlk.IsEnabled = true;
            controller.setInitId();
            controller.getInitId();
            PkgIdBlk.Text = controller.getInitId().ToString();
            theCurrentPackage.Id = controller.getInitId().ToString();
            setPackageAddress();
            setCity();
            setState();
            setZip();
            AddBtn.IsEnabled = true;
            ErrorViewer.IsEnabled = true;
            ScanBtn.IsEnabled = false;
            DateTime time = DateTime.Now;
            ArrivedAtTxtBlk.Text = time.ToString();
        }
        public int getZip()
        {
            zipcode = int.Parse(ZipTxt.Text);
            return zipcode;
        }
        public void setZip()
        {
            ZipTxt.Text = "";
            ZipTxt.IsEnabled = true;
        }
        public string getState()
        {
            int index;
            index = StateCmbo.SelectedIndex - 1;
            if (index >= 0)
                return states[index];
            else
                return "NVS";
        }
        public void setState()
        {

            StateCmbo.IsEnabled = true;
        }
        public void setCity()
        {
            CityTxt.Text = "";
            CityTxt.IsEnabled = true;
        }
        public string getCity()
        {
            return CityTxt.Text;
        }
        public void setPackageAddress()
        {
            AddressTxt.Text = "";
            AddressTxt.IsEnabled = true;

        }
        public string getPackageAddress()
        {
            return AddressTxt.Text;

        }


        private void AddBtn_Click(object sender, RoutedEventArgs e)
        {
            ScanBtn.IsEnabled = false;

            bool addr = checkAddress();
            bool cty = checkCity();
            bool ckst = checkState();
            bool chdz = checkZip();
            if((addr == true)&&(cty == true)&&(ckst == true)&&(chdz == true))

            {
                theCurrentPackage.address = getPackageAddress();
                theCurrentPackage.city = getCity();
                theCurrentPackage.zip = getZip();
                theCurrentPackage.state = getState();
                ErrorViewer.Content = "Package added";
                int index = StateCmbo.SelectedIndex - 1;
                controller.allPackages[index].Add(theCurrentPackage);
                //newList.Add(theCurrentPackage);
                //theCurrentPackage = null;
                AddressTxt.Text = "";
                PkgIdBlk.Text = "";
                CityTxt.Text = "";
                ZipTxt.Text = "";
                ScanBtn.IsEnabled = true;
                StateCmbo.SelectedIndex = -1;
                StateCmbo.IsEnabled = false;
                PkgsByStateCmbo.IsEnabled = true;
                NextBtn.IsEnabled = true;
                BackBtn.IsEnabled = true;

            }
           else
            {

                ErrorViewer.Content = "Package add unsuccessful. Please check for errors and try again";
                PkgIdBlk.Text = "";
                AddressTxt.Text = "";
                CityTxt.Text = "";
                StateCmbo.SelectedIndex = -1;
                ZipTxt.Text = "";
                AddBtn.IsEnabled = false;
                ScanBtn.IsEnabled = true;
                theCurrentPackage = null;

            }

        }

        public bool checkState()
        {
            bool result = false;
            if (getState() != "NVS")
            {
                result = true;
            }
            return result;
        }

        public bool checkAddress()
        {
            bool result = false;
            string str = getPackageAddress();
            if (str != null)
                result = true;
            return result;
        }

        public bool checkCity()
        {
            bool result = false;
            string str = getCity();
            if (str != null)
                result = true;
            return result;
        }

        public bool checkZip()
        {
            bool result = false;

            char[] zip = zipcode.ToString().ToCharArray();
            for (int i = 0; i < zip.Length; i++)
            {
                int val = (int)Char.GetNumericValue(zip[i]);

                if ((val.Equals(0)) || (val.Equals(1)) || (val.Equals(2)) || (val.Equals(3)) || (val.Equals(4))|| (val.Equals(5)) || (val.Equals(6))|| (val.Equals(7))|| (val.Equals(8)) || (val.Equals(9)))
                {

                    result = true;
                    //return result;
                }
                else
                {
                    result = false;
                }
            }
            return result;
        }



        private void NextBtn_Click(object sender, RoutedEventArgs e)
        {
            if (startingIndex < newList.Count)
            {
                startingIndex++;
                AddressTxt.Text = newList[startingIndex].address;
                CityTxt.Text = newList[startingIndex].city;
                //string str = newList[startingIndex].state;
                //for (int i = 0; i < states.Length; i++)
                //{
                //    if (states[i] == str)
                //    {
                //        StateCmbo.SelectedIndex = i;
                //    }
                //}
                ZipTxt.Text = newList[startingIndex].zip.ToString();
            }
            else if(startingIndex >= newList.Count)
            {
                AddressTxt.Text = newList.Last().address;
                CityTxt.Text = newList.Last().city;
                string str = newList.Last().state;
                for (int i = 0; i < states.Length; i++)
                {
                    if (states[i] == str)
                    {
                        StateCmbo.SelectedIndex = i + 1;
                    }
                }
                ZipTxt.Text = newList.Last().zip.ToString();
            }


        }

        private void PkgsByStateCmbo_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            ByStateListBox.Items.Clear();
            if (PkgsByStateCmbo.SelectedIndex >= 0)
            {
                int selectionI = PkgsByStateCmbo.SelectedIndex;
                newList = controller.allPackages[selectionI];
                foreach (Package p in newList)
                {
                    if (p.state == PkgsByStateCmbo.SelectedItem)
                    {
                        ByStateListBox.Items.Add(p.Id.ToString());
                    }
                }
            }

        } 



    }           
}

我需要MainWindow构造函数和选择更改方法更改的组合。

列表<列表<T>＆GT;使用ComboBoxItem

2 个答案: