C# 单击列表框中的项目并在多行文本框中查看详细信息

我想单击列表框中的一个项目，并将传递到该列表框的属性显示到多行文本框中

下面是我写的表单初始化代码

public Form1()
    {
        InitializeComponent();
        ReadFromFile.Read("sample.GED");

        foreach (KeyValuePair<int, Individual> kvp in ReadFromFile.individuals)
        {
            listBox2.Items.Add("ID = " + kvp.Value.id + " Name = " + kvp.Value.name.givenName + " " + kvp.Value.name.surname + " DoB = " + kvp.Value.birth.date);
        }

        int testIndividual = 94;

        string genderOut = "";
        if (ReadFromFile.individuals[testIndividual].gender == "M")
        {
            genderOut = "MALE";
        }
        else if (ReadFromFile.individuals[testIndividual].gender == "F")
        {
            genderOut = "FEMALE";
        }

        try
        {
            textBox1.AppendText(
                "Name = " + ReadFromFile.individuals[testIndividual].name.givenName + " "
                + ReadFromFile.individuals[testIndividual].name.surname
                + Environment.NewLine + "Gender = " + genderOut
                + Environment.NewLine + "Birth date = " + ReadFromFile.individuals[testIndividual].birth.date
                + Environment.NewLine + "Birth place = " + ReadFromFile.individuals[testIndividual].birth.place
                + Environment.NewLine + "Death date = " + ReadFromFile.individuals[testIndividual].death.date
                + Environment.NewLine + "Death place = " + ReadFromFile.individuals[testIndividual].death.place);
        }
        catch
        {
            MessageBox.Show("This individual doesnt exist");
        }
    }
}

public Form1（）
{
初始化组件（）；
ReadFromFile.Read（“sample.GED”）；
foreach（ReadFromFile.Persons中的KeyValuePair kvp）
{
列表框2.Items.Add（“ID=“+kvp.Value.ID+”Name=“+kvp.Value.Name.givenName+”+kvp.Value.Name.姓氏+”DoB=“+kvp.Value.birth.date”）；
}
int-testIndividual=94；
字符串genderOut=“”；
if（ReadFromFile.personals[testIndividual].gender==“M”）
{
genderOut=“男”；
}
else if（ReadFromFile.personals[testIndividual].gender==“F”）
{
genderOut=“女性”；
}
尝试
{
textBox1.AppendText(
“Name=“+ReadFromFile.personals[testIndividual].Name.givenName+”
+ReadFromFile.personals[testIndividual].name.name
+Environment.NewLine+“Gender=“+genderOut”
+Environment.NewLine+“Birth date=“+ReadFromFile.personals[testIndividual].Birth.date”
+Environment.NewLine+“出生地=“+ReadFromFile.personals[testIndividual].Birth.place”
+Environment.NewLine+“Death date=“+ReadFromFile.personals[testIndividual].Death.date”
+Environment.NewLine+“Death place=“+ReadFromFile.personals[testIndividual].Death.place”）；
}
抓住
{
MessageBox.Show（“这个人不存在”）；
}
}
}

我想添加更多内容，以便单击列表框项目，该项目的详细信息将显示在文本框中

---

我感觉可能必须重写ToString（）方法或正则表达式。我还是一个新手，所以请对我放松：）谢谢你

你需要为你的列表框处理

SelectedIndexChanged

事件

一种方法是打开Form1.cs[Design]并选择列表框。在特性网格（Alt+Enter）中，单击如下所示的图标：

public class Individual
{
    // ... your code
    public string DisplayName
    {
        get { return String.Format("{0} {1}), name.givenName, name.surname; }
    }
    // ... the rest of your code
}

listBox1.DisplayMember = "name";

找到事件

SelectedIndexChanged

，然后双击它。这将在自动生成的Form1.cs.designer文件中为您连接一个事件处理程序

接下来，将Form1类的代码替换为以下代码：

public partial class Form1 : Form
{
    private Dictionary<int, Individual> _individuals;

    public Form1()
    {
        InitializeComponent();
        ReadFromFile.Read("sample.GED");
        _individuals = ReadFromFile.individuals;

        listBox1.DataSource = _individuals.Select(individual => individual.Value).ToList();
        listBox1.DisplayMember = "name";
        listBox1.ValueMember = "id";  
    }

    private void listBox2_SelectedIndexChanged(object sender, EventArgs e)
    {
        textBox1.Clear();
        var individual = listBox1.SelectedItem as Individual;
        string genderOut = (individual.Gender == "M") ? "MALE" : "FEMALE";
        var displayText 
            = String.Format("Name = {0} {1}\r\n" +
                            "Gender = {2}\r\n" +
                            "Birth date = {3}\r\n" +
                            "Birth place = {4}\r\n" +
                            "Death date = {5}\r\n" +
                            "Death place = {6}"
                            , individual.name.givenName
                            , individual.name.surname
                            , genderOut
                            , individual.birth.date
                            , individual.birth.place
                            , individual.death.date
                            , individual.death.place);
        textBox1.AppendText(displayText);
    }
}

然后您需要更改上面我的代码中的行，如下所示：

public class Individual
{
    // ... your code
    public string DisplayName
    {
        get { return String.Format("{0} {1}), name.givenName, name.surname; }
    }
    // ... the rest of your code
}

listBox1.DisplayMember = "name";

为此：

listBox1.DisplayMember = "DisplayName";

---

最后一点注意：您可能应该使用“上驼峰大小写”作为属性名。这意味着它们以大写字母开头，然后每个单词的第一个字母也是大写字母。例如，

name.givenName

应该是

name.givenName

。这是一个广泛使用的约定。

您的代码在什么方面不起作用？你真正的问题是什么？@Robbie这个代码有效，但这是我用来将内容传递到列表框的代码。我想添加更多内容，这样我可以单击列表框项目，该项目的详细信息将显示在文本框中非常感谢，问题是，我从代码中收到一条错误消息，说“对象引用未设置为对象的实例”。该错误消息位于“string genderOut=（individual.gender=”M“？”行中：“男性”：“女性”；“怎么办？”？谢谢大家!@用户1290653很高兴听到这个消息。记住，如果我的帖子对你有帮助，请接受答案并投票。谢谢