如何使用Linq填充ListBox到Sql C＃

Question

我有一个问题，如何用数据库中的数据填充一个列表框，而没有db和花括号这是我的代码：

var db = new DataClasses1DataContext();
        var history =( from a in db.ResultsHistories
            where
                a.PlayerOne == _playerOne && a.PlayerTwo == comboBox.Text ||
                a.PlayerTwo == _playerOne && a.PlayerOne == comboBox.Text
            select new
            {
                a.PlayerOne,
                a.PlayerTwo,
                a.Date,
                a.ResultOne,
                a.ResultTwo
            }).ToList();

        listBox.ItemsSource = history;

结果：我只需要这些列中的数据。

Answer 1

请在这里查看答案：Multicolumn ListBox in WPF

您也可以为此使用DataGrid。的XAML代码为：

<DataGrid x:Name="NamesDataGrid"></DataGrid>

以及后面非常简单的代码：

public partial class MainWindow : Window
{
    private readonly List<Name> _nameList = new List<Name>
    {
        new Name("Eric","Clapton"),
        new Name("Mark", "Knopfler")
    };
    public MainWindow()
    {
        InitializeComponent();
        NamesDataGrid.ItemsSource = _nameList;
    }
}

internal class Name
{
    public Name(string firstName, string lastName)
    {
        FirstName = firstName;
        LastName = lastName;
    }
    public string FirstName { get; set; }
    public string LastName { get; set; }
}

哪个看起来像这样：

Answer 2

如果您要返回一个新对象，则必须将其属性告诉为

select new {PlayerOne = a.PlayerOne
            //More Properties Here
           }

因此，根据您的示例，可能看起来像

var db = new DataClasses1DataContext();
    var history =( from a in db.ResultsHistories
        where
            a.PlayerOne == _playerOne && a.PlayerTwo == comboBox.Text ||
            a.PlayerTwo == _playerOne && a.PlayerOne == comboBox.Text
        select new
        {
            PlayerOne = a.PlayerOne,
            PlayerTwo = a.PlayerTwo,
            Date = a.Date,
            ResultOne = a.ResultOne,
            ResultTwo = a.ResultTwo
        }).ToList();

    listBox.ItemsSource = history;

这将返回没有类型的新对象的列表，但是属性将在那里

编辑：如果要从PlayerOne和PlayerTwo等于文本框值的表中获取所有数据，请执行

var history = db.ResultsHistories.Where(x => x.PlayerTwo == comboBox.Text || x.PlayerOne == comboBox.Text).Select(x => x).ToList();

Answer 3

尝试添加此内容

• “，” +语句之间>

  a.PlayerOne +“，” + a.PlayerTwo +“，” + a.Date +“，” + a.ResultOne +“，” + a.ResultTwo

可以使用