WPF中DataGrid.RowDetailsTemplate内嵌DataGrid

Question

我正在尝试在WPF DataGrid的RowDetailsTemplate中创建一个DataGrid。

我有一个工作集合。每个工作可以分配给一个或多个员工：

public class Job : _Base
{
    private string _JobName = string.Empty;
    public string JobName
    {
        get { return _JobName; }
        set 
        {
            if (_JobName != value)
            {
                _JobName = value;
                RaisePropertyChanged("JobName");
            }
        }
    }

    private string _JobNumber = string.Empty;
    public string JobNumber
    {
        get { return _JobNumber; }
        set
        {
            if (_JobNumber != value)
            {
                _JobNumber = value;
                RaisePropertyChanged("JobNumber");
            }
        }
    }

    private ObservableCollection<Employee> _Employees;
    public ObservableCollection<Employee> Employees
    {
        get { return _Employees; }
        set
        {
            if (_Employees != value)
            {
                if (_Employees != value)
                {
                    _Employees = value;
                    RaisePropertyChanged("Employees");
                }
            }
        }
    }

    public Job()
    {
        Employees = new ObservableCollection<Employee>();
    }
}

并且

public class Employee : _Base
{
    private string _EmployeeName = string.Empty;
    public string EmployeeName
    {
        get { return _EmployeeName; }
        set
        {
            if (_EmployeeName != value)
            {
                _EmployeeName = value;
                RaisePropertyChanged("EmployeeName");
            }
        }
    }

    private bool _IsChecked = false;
    public bool IsChecked
    {
        get { return _IsChecked; }
        set
        {
            if (_IsChecked != value)
            {
                _IsChecked = value;
                RaisePropertyChanged("IsChecked");
            }
        }
    }
}     

我的XAML代码如下：

<DataGrid ItemsSource="{Binding Jobs}"
            AutoGenerateColumns="False">

    <DataGrid.Columns>
        <DataGridTextColumn Header="Job Name" Binding="{Binding JobName}" />
        <DataGridTextColumn Header="Job Number" Binding="{Binding JobNumber}" />
    </DataGrid.Columns>

    <DataGrid.RowDetailsTemplate>
        <DataTemplate>
            <DataGrid ItemsSource="{Binding Employees}"
                        AutoGenerateColumns="False">
                <DataGridCheckBoxColumn Binding="{Binding IsChecked}"/>
                <DataGridTextColumn Binding="{Binding EmployeeName}"/>
            </DataGrid>
        </DataTemplate>
    </DataGrid.RowDetailsTemplate>

</DataGrid>

当我运行这个程序并点击一行时，会出现以下错误信息：在使用ItemsSource时，操作无效。请使用ItemsControl.ItemsSource来访问和修改元素。 如果我移除内部网格的列定义，那么就不会出现错误。但是这样它就会自动生成列。我需要自己指定列。这里出了什么问题？

- CoderForHire

Answer 1

您需要正确定义内部数据表格的列

<DataGrid ItemsSource="{Binding Employees}" AutoGenerateColumns="False">
    <DataGridCheckBoxColumn Binding="{Binding IsChecked}"/>
    <DataGridTextColumn Binding="{Binding EmployeeName}"/>
</DataGrid>

把这个转换成

<DataGrid ItemsSource="{Binding Employees}" AutoGenerateColumns="False">
    <DataGrid.Columns>
       <DataGridCheckBoxColumn Binding="{Binding IsChecked}"/>
       <DataGridTextColumn Binding="{Binding EmployeeName}"/>
    </DataGrid.Columns>
</DataGrid>

你所尝试做的是在XAML中设置源，然后通过ItemsSource将其绑定到另一个源上，这就是错误的根源。

- jamesSampica