二进制文件填充DataGridView仅生成行列无内容的解决方法

问题根源分析 #

你的代码能生成正确行数但单元格无数据，核心原因通常有两个：

• Cliente类属性访问权限不足：DataGridView仅能绑定公共（public）属性，若你的Cliente类字段是私有或内部访问级别，控件无法读取数据。
• ArrayList是弱类型数据源：ArrayList存储的是object类型，DataGridView无法自动识别Cliente的属性信息，导致绑定失效。

具体修复步骤 #

1. 确保Cliente类的属性为公共可访问 #

检查并修改Cliente类定义，必须将属性声明为public，示例如下：

public class Cliente
{
    public string codigoCliente { get; set; }
    public string nome { get; set; }
    public string nif { get; set; }
    public string email { get; set; }

    public Cliente(string codigo, string nome, string nif, string email)
    {
        this.codigoCliente = codigo;
        this.nome = nome;
        this.nif = nif;
        this.email = email;
    }
}

2. 将ArrayList替换为强类型的List #

把原来的clientes变量类型从ArrayList改为List<Cliente>，强类型数据源能让DataGridView更准确地识别属性：

// 替换原来的ArrayList声明
private List<Cliente> clientes = new List<Cliente>();

3. 优化DataGridView绑定逻辑 #

设置DataSource前先重置为null，确保控件强制刷新：

dataGridViewClientes.DataSource = null;
dataGridViewClientes.DataSource = clientes;

修复后的完整代码片段 #

private void button3_Click(object sender, EventArgs e)
{
    using (OpenFileDialog localizarArquivoDialog = new OpenFileDialog())
    {
        localizarArquivoDialog.Filter = "Arquivos Binários (*.bin)|*.bin";
        localizarArquivoDialog.DefaultExt = "bin";

        DialogResult resultado = localizarArquivoDialog.ShowDialog();
        if (resultado == DialogResult.OK)
        {
            caminhoArquivo = localizarArquivoDialog.FileName;

            // 清空强类型列表
            clientes.Clear();

            using (FileStream fs = new FileStream(caminhoArquivo, FileMode.Open))
            {
                using (BinaryReader reader = new BinaryReader(fs))
                {
                    while (reader.BaseStream.Position < reader.BaseStream.Length)
                    {
                        string codigoCliente = reader.ReadString();
                        string nome = reader.ReadString();
                        string nif = reader.ReadString();
                        string email = reader.ReadString();
                        Cliente cliente = new Cliente(codigoCliente, nome, nif, email);
                        clientes.Add(cliente);
                    }
                }
            }

            // 配置DataGridView列
            dataGridViewClientes.AutoGenerateColumns = false;
            dataGridViewClientes.Columns.Clear();

            dataGridViewClientes.Columns.Add("codigoCliente", "Código Cliente");
            dataGridViewClientes.Columns["codigoCliente"].DataPropertyName = "codigoCliente";

            dataGridViewClientes.Columns.Add("nome", "Nome");
            dataGridViewClientes.Columns["nome"].DataPropertyName = "nome";

            dataGridViewClientes.Columns.Add("nif", "NIF");
            dataGridViewClientes.Columns["nif"].DataPropertyName = "nif";

            dataGridViewClientes.Columns.Add("email", "Email");
            dataGridViewClientes.Columns["email"].DataPropertyName = "email";
            
            // 重置并绑定数据源
            dataGridViewClientes.DataSource = null;
            dataGridViewClientes.DataSource = clientes;
        }
        else
        {
            caminhoArquivo = "";
            MessageBox.Show("Nenhum arquivo selecionado.");
        }
    }
}

内容的提问来源于stack exchange，提问作者Pedro