Binding custom list object properties to textbox from code behind

问题

Student class

public class Student
{
    string name;        

    List<SubjectInfo> subjectInfoList;        

    ....
}

List<SubjectInfo> List can have different number of SubjectInfo objects for different students.

SubjectInfo class

public class SubjectInfo
{
    string subjectCode;

    int marks;

    ...
}

I want to display student object detail on a window. Since List have different number of object count I generated these from code behind.

int i = 10;

        foreach (SubjectInfo info in student.SubjectInfoList)
        {
            TextBox tb = new TextBox();
            tb.Width = 200;
            tb.Height = 20;
            tb.Margin = new Thickness(10, i, 0, 0);
            StudentDataGrid.Children.Add(tb);
            i += 60;
        }

I would like to bind this List list from code behind. But I have no idea of doing that.
I want to bind marks property of student.SubjectInfoList

Please help me with binding list object properties from codebehind.

EDIT
This is the sample student object;

Student student = new Student("Joe", new List<SubjectInfo>() { new SubjectInfo("Subject1", 50), new SubjectInfo("Subject2", 70)});

My window should like this;

NOTE if student doing 4 subjects total TextBox count is 5.

回答1:

Pure XAML solution:

<Window  (... your window attributes) >

    ....

    <Grid x:Name="StudentDataGrid">
        <ListView ItemsSource="{Binding SubjectInfoList}">
            <ListView.ItemTemplate>
                <DataTemplate DataType="{x:Type local:SubjectInfo}">
                    <TextBox Text="{Binding Marks}"/>
                </DataTemplate>
            </ListView.ItemTemplate>
        </ListView>
    </Grid>
</Window>

But to have it work you have to transform your fields to public properties:

public class Student
{
    string name;        

    public List<SubjectInfo> SubjectInfoList { get; set; }

    ....
}

and:

public class SubjectInfo
{
    string subjectCode;

    public int Marks { get; set; }

    ...
}

UPDATE

XAML:

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:WpfApplication1"
        Title="MainWindow" Height="350" Width="525">


    <Grid x:Name="StudentGrid">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="Auto" />
            <ColumnDefinition Width="*" />
        </Grid.ColumnDefinitions>

        <TextBlock Text="Student name :" Grid.Row="0" Grid.Column="0"/>
        <TextBlock Text="Student marks :" Grid.Row="1" Grid.Column="0"/>

        <TextBox Text="{Binding Name}" Grid.Row="0" Grid.Column="1" />

        <ListView Grid.Row="1" Grid.Column="1" ItemsSource="{Binding SubjectInfoList}" BorderThickness="0">
            <ListView.ItemTemplate>
                <DataTemplate DataType="{x:Type local:SubjectInfo}">
                    <Grid>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="100"/>
                            <ColumnDefinition Width="50"/>
                        </Grid.ColumnDefinitions>

                        <TextBlock Grid.Column="0" Text="{Binding SubjectCode}"/>
                        <TextBox Grid.Column="1" Text="{Binding Marks}"/>
                    </Grid>
                </DataTemplate>
            </ListView.ItemTemplate>
        </ListView>
    </Grid>
</Window>

The code:

using System.Collections.Generic;
using System.Windows;

namespace WpfApplication1
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();

            Student student = new Student("Joe", new List<SubjectInfo>() { new SubjectInfo("Subject1", 50), new SubjectInfo("Subject2", 70) });
            StudentGrid.DataContext = student;
        }
    }

    public class Student
    {
        public string Name { get; set; }
        public List<SubjectInfo> SubjectInfoList { get; set; }

        public Student(string name, List<SubjectInfo> list)
        {
            Name = name;
            SubjectInfoList = list;
        }
    }

    public class SubjectInfo
    {
        public string SubjectCode { get; set; }
        public int Marks { get; set; }

        public SubjectInfo(string subjectCode, int marks)
        {
            SubjectCode = subjectCode;
            Marks = marks;
        }
    }
}

回答2:

Better to do it in XAML. But if you really want to do it in code-behind, try this. Fields of SubjectInfo must be public.

foreach (SubjectInfo info in student.SubjectInfoList)
{
   TextBox tb = new TextBox();
   ///...
   tb.DataContext = info;
   Binding binding = new Binding("marks");
   tb.SetBinding(TextBox.TextProperty, binding);
   ///...
}

来源：https://stackoverflow.com/questions/14589200/binding-custom-list-object-properties-to-textbox-from-code-behind

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wpf

binding