Question

在创建数据绑定的ListBox时遇到一些麻烦。加载表单时未显示任何内容。这是我的代码：

FunildeVendasDTO.cs

namespace DTO
{
    public class FunildeVendasDTO
    {
        private string id;
        private string descricao;
        private string prazo;
        private string cidade;
        private string fantasia;
        private string descricao_Status;
        private int status_Orcamento;

        public string Id { get => id; set => id = value; }
        public string Descricao { get => descricao; set => descricao = value; }
        public string Prazo { get => prazo; set => prazo = value; }
        public string Cidade { get => cidade; set => cidade = value; }
        public string Fantasia { get => fantasia; set => fantasia = value; }
        public string Descricao_Status { get => descricao_Status; set => descricao_Status = value; }
        public int Status_Orcamento { get => status_Orcamento; set => status_Orcamento = value; }
    }
}

FunildeVendasBLL.cs

using System;
using DTO;
using DAL;
using System.Data;
using System.Collections.ObjectModel;

namespace BLL
{
    class FunildeVendasBLL
    {
        AcessoBancoDados bd = new AcessoBancoDados();
        readonly FunildeVendasDTO dto = new FunildeVendasDTO();

        public ObservableCollection<FunildeVendasDTO> LoadNegocios()
        {
            var negocios = new ObservableCollection<FunildeVendasDTO>();
            try
            {
                var query = "SELECT n.id, so.descricao as status_orcamento, n.status_orcamento_id, n.descricao, n.prazo, cid.uf, cid.cidade, c.fantasia FROM negocio n JOIN estabelecimento e ON e.id = n.estabelecimento_id JOIN cliente c ON c.id = e.cliente_id JOIN cidades cid ON cid.id = e.cidades_id JOIN status_orcamento so ON so.id = n.status_orcamento_id ORDER BY n.status_orcamento_id, n.id";
                bd.Conectar();
                var dtt = bd.RetDataTable(query);
                foreach (DataRow dr in dtt.Rows)
                {
                    negocios.Add(new FunildeVendasDTO { Id = dr["id"].ToString(), Descricao = dr["descricao"].ToString(), Prazo = Convert.ToDateTime(dr["prazo"]).ToString("dd/MM/yyyy"), Cidade = dr["cidade"].ToString() + " - " + dr["uf"].ToString(), Fantasia = dr["fantasia"].ToString(), Descricao_Status = dr["status_orcamento"].ToString(), Status_Orcamento = Convert.ToInt32(dr["status_orcamento_id"]) });
                }
            }
            catch (Exception ex)
            {

                throw new Exception(ex.Message);
            }
            finally
            {
                bd.CloseConection();
            }

            return negocios;
        }
    }
}

Window2.xaml

<Window x:Class="GeGET.Window2"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:GeGET"
        mc:Ignorable="d"
        Title="Window2" Height="450" Width="800">
    <Grid>
        <ListBox x:Name="List1" ItemsSource="{Binding Lista}">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <Button></Button>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>
    </Grid>
</Window>

Window2.xaml.cs

using System.Windows;
using DTO;
using BLL;
using System.Collections.ObjectModel;

namespace GeGET
{
    /// <summary>
    /// Interaction logic for Window2.xaml
    /// </summary>
    /// 
    public partial class Window2 : Window
    {

        FunildeVendasDTO dto = new FunildeVendasDTO();
        FunildeVendasBLL bll = new FunildeVendasBLL();

        ObservableCollection<FunildeVendasDTO> Lista;

        public Window2()
        {
            InitializeComponent();

            Lista = bll.LoadNegocios();

        }
    }
}

解决这个问题有什么想法吗？我想这是因为Observable集合在另一个名称空间中。对不起，这个愚蠢的问题，我在WPF中还很陌生，我发现它是超级大国：）

Answer 1

您绑定的属性必须是公开的... 绑定通常不适用于字段。

Answer 2

将Lista设置为公共属性，因为您只能绑定到这些属性。

将窗口的DataContext设置为其自身的实例，因为如果您未明确指定绑定的源，则绑定到DataContext的属性。

public partial class Window2 : Window
{
    readonly FunildeVendasDTO dto = new FunildeVendasDTO();
    readonly FunildeVendasBLL bll = new FunildeVendasBLL();

    public ObservableCollection<FunildeVendasDTO> Lista { get; private set; }

    public Window2()
    {
        InitializeComponent();
        Lista = bll.LoadNegocios();
        DataContext = this;
    }
}

WPF-列表绑定未加载数据源

2 个答案: