如何使用实体框架将文件从MsSql服务器上传到WinForm？

// 配置文件中的连接字符串
<connectionStrings>
  <add name="MyDbContext" connectionString="Data Source=YourServer;Initial Catalog=YourDatabase;User ID=YourUsername;Password=YourPassword;" providerName="System.Data.SqlClient" />
</connectionStrings>

// 创建实体模型
public class MyDbContext : DbContext
{
    public DbSet<FileEntity> Files { get; set; }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        // 配置实体映射到数据库表
        modelBuilder.Entity<FileEntity>().ToTable("Files");
    }
}

public class FileEntity
{
    public int Id { get; set; }
    public string FileName { get; set; }
    public byte[] FileData { get; set; }
}

// 文件上传功能界面的事件处理程序
private void btnUpload_Click(object sender, EventArgs e)
{
    OpenFileDialog openFileDialog = new OpenFileDialog();
    if (openFileDialog.ShowDialog() == DialogResult.OK)
    {
        string filePath = openFileDialog.FileName;
        byte[] fileData = File.ReadAllBytes(filePath);

        using (var dbContext = new MyDbContext())
        {
            FileEntity fileEntity = new FileEntity
            {
                FileName = Path.GetFileName(filePath),
                FileData = fileData
            };

            dbContext.Files.Add(fileEntity);
            dbContext.SaveChanges();
        }

        MessageBox.Show("文件上传成功！");
    }
}