WPF中的DataGridComboBoxColumn SelectedValuePath

问题描述

我想在数据网格中添加一个组合框，使用访问权限从数据库中填充它。我将该列设置为值路径并在WPF中显示成员路径？

I want to add a combo box in data grid, fill it from database using access. I set this column selected value path and display member path in WPF?

推荐答案

您必须从列的元素样式访问组合框以及用于设置items source属性的元素编辑样式。
示例：

You have to access the combobox from the column's element style and the element editing style for setting the items source property.Example:

<DataGrid Name="dgMainGrid" AutoGenerateColumns="False">
        <DataGrid.Columns>
            <DataGridTextColumn Header="Id" Binding="{Binding Id, UpdateSourceTrigger=PropertyChanged}"/>
            <DataGridTextColumn Header="Description" Binding="{Binding Description, UpdateSourceTrigger=PropertyChanged}" />
            <DataGridComboBoxColumn Header="Student List" DisplayMemberPath="Name" SelectedValuePath="Id">
                <DataGridComboBoxColumn.ElementStyle>
                    <Style TargetType="{x:Type ComboBox}">
                        <Setter Property="ItemsSource" Value="{Binding StudentsList}" />
                    </Style>
                </DataGridComboBoxColumn.ElementStyle>
                <DataGridComboBoxColumn.EditingElementStyle>
                    <Style TargetType="{x:Type ComboBox}">
                        <Setter Property="ItemsSource" Value="{Binding StudentsList}" />
                    </Style>
                </DataGridComboBoxColumn.EditingElementStyle>
            </DataGridComboBoxColumn>
        </DataGrid.Columns>
    </DataGrid>

类之间的关系：

class SampleEntity : INotifyPropertyChanged
{
    DateTime date = DateTime.Now, then = DateTime.Now;

    #region Constructor

    public SampleEntity()
    {
    }

    #endregion

    #region Properties

    public int Id { get; set; }

    public string Description { get; set; }

    public List<StudentEntity> StudentsList { get; set; }

    public StudentEntity SelectedStudent { get; set; }

    #endregion

    #region Notify Property Changed

    public event PropertyChangedEventHandler PropertyChanged;

    public void NotifyPropertyChanged(string propName)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propName));
    }

    #endregion
}

class StudentEntity : INotifyPropertyChanged
{
    DateTime date = DateTime.Now, then = DateTime.Now;

    #region Constructor

    public StudentEntity()
    {
    }

    #endregion

    #region Properties

    public int Id { get; set; }

    public string Name { get; set; }

    #endregion

    #region Notify Property Changed

    public event PropertyChangedEventHandler PropertyChanged;

    public void NotifyPropertyChanged(string propName)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propName));
    }

    #endregion
}

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