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我正在使用Entity Framework创建我的系统，我已经将对象属性绑定到a DataGrid，每个字段都显示数据，但只有一个属性Fornecedor，是另一个类，第一次无法显示，它只会在我打开时显示新注册窗口并关闭，我不知道为什么会这样，因为我在构造函数和 NewRegister.Closed 中使用相同的方法显示列表，让我的班级休息

public class Produto
{
    public int Id { get; set; }
    public string Codigo { get; set; }
    public string Linha { get; set; }
    public int Comprimento { get; set; }
    public int Largura { get; set; }
    public string Cor { get; set; }
    public string CorPe { get; set; }
    public int Gaveta { get; set; }
    public Fornecedor Fornecedor { get; set; }   // <- Fornecedor is other class
    public byte[] Foto { get; set; }
    public int Estoque { get; set; }
    public float ValorCompra { get; set; }
    public float ValorVenda { get; set; }
}

Fornecedor 类在这里：

public class Fornecedor
{
    public int Id { get; set; }
    public string Nome { get; set; }
    public string Cidade { get; set; }
    public string Estado { get; set; }
    public string Email1 { get; set; }
    public string Email2 { get; set; }
    public string Email3 { get; set; }
    public string Telefone1 { get; set; }
    public string Telefone2 { get; set; }
    public string Telefone3 { get; set; }
}

所以，我已经DataContext为我的 Window 设置Binding了DataGridTextColumns

public PageMesa()
{
    InitializeComponent();
    ShowList();
}

private void ShowList()
{
    listMesa.ItemsSource = db.Mesas.ToList();
}

private void NewCommand_Executed(object sender, ExecutedRoutedEventArgs e)
{
    MesaEditar NewRegister = new MesaEditar();
    NewRegister.Closed += (s, arg) => { ShowList(); };
    NewRegister.ShowDialog();
}

我的数据网格

<DataGrid Name="listMesa" Grid.Row="1" Margin="10,0" AutoGenerateColumns="False" IsReadOnly="True">
    <DataGrid.Columns>
        <DataGridTextColumn Header="ID" Binding="{Binding Id}" Width="1*" />
        <DataGridTextColumn Header="Codigo" Binding="{Binding Codigo}" Width="2*" />
        <DataGridTextColumn Header="Linha" Binding="{Binding Linha}" Width="2*" />
        <DataGridTextColumn Header="Comprimento" Binding="{Binding Comprimento}" Width="3*" />
        <DataGridTextColumn Header="Largura" Binding="{Binding Largura}" Width="3*" />
        <DataGridTextColumn Header="Cor" Width="2*">
            <DataGridTextColumn.CellStyle>
                <Style TargetType="DataGridCell">
                    <Setter Property="Background" Value="{Binding Cor}" />
                </Style>
            </DataGridTextColumn.CellStyle>
        </DataGridTextColumn>
        <DataGridTextColumn Header="Cor do pé" Binding="{Binding CorPe}" Width="4*" />
        <DataGridTextColumn Header="Gaveta" Binding="{Binding Gaveta}" Width="2*" />
        <DataGridTextColumn Header="Fornecedor" Binding="{Binding Fornecedor.Nome}" Width="4*" />
        <DataGridTextColumn Header="Estoque" Binding="{Binding Estoque}" Width="2*" />
        <DataGridTextColumn Header="Valor da compra" Binding="{Binding ValorCompra, StringFormat=R$0.00}" Width="4*" />
        <DataGridTextColumn Header="Valor da venda" Binding="{Binding ValorVenda, StringFormat=R$0.00}" Width="4*" />
    </DataGrid.Columns>
</DataGrid>

为什么会这样？对不起，我表达不好，我不知道如何表达这个问题，请每个问题都问我

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