用来自组合框的数据填充文本框，与 xml 连接

Question

我让组合框显示“名称”，但是当单击名称时，“类型”和“生活”不想出现在文本框中。

另外，有没有办法让它在 xml 中没有 '/data> 的情况下工作？

data.xml

    <?xml version="1.0"?>
    <Data>
    <Start Name="Anaconda" type="Snake" living="Nowhere" />
    <Start Name="Sphynx" type="Cat" living="Everywhere" />
    <Start Name="Amanita muscaria" type="Fungus" living="Woodstock" />
    </Data>

C# 代码：

    public Form1()
    {
        InitializeComponent();

        DataSet dataSet = new DataSet();
        dataSet.ReadXml("data.xml");
        this.comboBox1.DataSource = dataSet.Tables[0];
        this.comboBox1.DisplayMember = "Name";
    }

Answer 1

这是将值绑定到某些文本框的先机：

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();

        var dataSet = new DataSet();
        var bindingSource = new BindingSource();
        bindingSource.DataSource = dataSet.ReadXml("data.xml");

        comboBox1.DisplayMember = "Name";
        comboBox1.DataSource = dataSet.Tables[0];

        tbName.DataBindings.Add("Text", comboBox1.SelectedItem, "Name");
        tbType.DataBindings.Add("Text", comboBox1.SelectedItem, "type");
        tbLiving.DataBindings.Add("Text", comboBox1.SelectedItem, "living");
    }
}

编辑：

一个完整的示例将读取的 XML 文件内容放入一个类中，并将其绑定到所有控件。

向@Jimi 致敬Binding a TextBox to a ListBox SelectedItem。 这对定位很有帮助。

public partial class Form1 : Form
{
    #region Private Members

    /// <summary>
    /// The content list to bind to.
    /// </summary>
    private BindingList<Data> mData = null;

    /// <summary>
    /// The item to bind to.
    /// </summary>
    private BindingSource mDataSource = null;

    #endregion

    #region Constructor

    /// <summary>
    /// Default constructor.
    /// </summary>
    public Form1()
    {
        InitializeComponent();

        // Get binding content
        mData = GetXmlData("data.xml");

        // Prepare the binding source from the read content
        mDataSource = new BindingSource(mData, null);

        // Set what is to be displayed
        comboBox1.DisplayMember = "Name";
        comboBox1.DataSource = mDataSource;

        // Bind textboxes
        tbName.DataBindings.Add(new Binding("Text", mDataSource, "Name", false, DataSourceUpdateMode.OnPropertyChanged));
        tbType.DataBindings.Add(new Binding("Text", mDataSource, "type", false, DataSourceUpdateMode.OnPropertyChanged));
        tbLiving.DataBindings.Add(new Binding("Text", mDataSource, "living", false, DataSourceUpdateMode.OnPropertyChanged));
    }

    #endregion

    /// <summary>
    /// Reads the provided XML file and puts it into a structured binding list.
    /// </summary>
    /// <returns></returns>
    private BindingList<Data> GetXmlData(string xmlFile)
    {
        // Create a data set and read the file
        var dataSet = new DataSet();
        dataSet.ReadXml(xmlFile);

        // Convert the content to a List<Data>
        var data = dataSet.Tables[0].AsEnumerable().Select(r => new Data
        {
            Name = r.Field<string>("Name"),
            Type = r.Field<string>("type"),
            Living = r.Field<string>("living")
        }).ToList();

        // Return the content as BindingList<Data>
        return new BindingList<Data>(data);
    }
}

在这种情况下，您需要一个类来将文件的内容放入其中。 Data 类如下：

/// <summary>
/// The structure of a read XML file.
/// </summary>
public class Data
{
    /// <summary>
    /// The name of an item.
    /// </summary>
    public string Name { get; set; }

    /// <summary>
    /// The type of an item.
    /// </summary>
    public string Type { get; set; }

    /// <summary>
    /// The living space of an item.
    /// </summary>
    public string Living { get; set; }
}

之前提到过需要一个唯一标识符来处理双重数据。在这里你没有。组合框绑定到Data 的对象，并且对它自己是唯一的。