XGKYTJ/Solution/SiteLibrary/Controllers/ApiController.cs

using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Data.Sqlite;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.IO;

namespace WinFormNet5.Controllers
{
    public class DataController : Controller
    {
        private readonly IWebHostEnvironment _env;
        private readonly ILogger<DataController> _logger;

        public DataController(IWebHostEnvironment env, ILogger<DataController> logger)
        {
            _env = env;
            _logger = logger;
        }

        [Route("/api/data")]
        public IActionResult Data(string query, int pageIndex = 1, int pageSize = 10, bool fetchAll = false)
        {
            var response = new ResponseMessage
            {
                PageIndex = pageIndex,
                PageSize = pageSize
            };
            if (!string.IsNullOrWhiteSpace(query))
            {
                try
                {
                    var baseDir = this._env.WebRootPath;
                    using var connection = new SqliteConnection($"Data Source={Path.Combine(baseDir, "data.copy.db")}");
                    connection.Open();
                    var command = connection.CreateCommand();
                    command.CommandText = fetchAll ? query : $"{query} limit {pageSize} offset {(pageIndex - 1) * pageSize}";
                    var results = new List<Dictionary<string, object>>();
                    var list = new List<object>();
                    using (var reader = command.ExecuteReader())
                    {
                        while (reader.Read())
                        {
                            var item = new Dictionary<string, object>();
                            for (int i = 0; i < reader.FieldCount; i++)
                            {
                                item.Add(reader.GetName(i), reader.IsDBNull(i) ? null : reader.GetValue(i));
                            }
                            results.Add(item);
                        }
                    }
                    response.Success = true;
                    response.Total = results.Count;
                    response.Data = results;
                }
                catch (Exception ex)
                {
                    this._logger.LogError(ex.ToString());
                    response.Message = ex.Message;
                }
            }

            return Json(response);
        }

        private class ResponseMessage
        {
            public bool Success { get; set; }
            public string Message { get; set; }
            public int Total { get; set; }
            public int PageIndex { get; set; }
            public int PageSize { get; set; }
            public object Data { get; set; }
        }
    }
}