Question

我正在尝试使用Google Charts API来显示数据库中的数据。我正在使用以下教程：https://www.c-sharpcorner.com/article/asp-net-mvc5-google-charts-api-integration/

我已经在控制器中注意到，它们使用txt文件加载数据。string srcFilePath = "Content/files/SalesOrderDetail.txt";是否有一种使用实体框架加载数据的方法，我该怎么做？

我是mvc的新手，并且使用api，因此我不确定如何实现此目标。

我首先在项目中使用了数据库。

控制器：

using HolidayTracker.Models;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Web;
using System.Web.Mvc;

namespace Graphs.Controllers
{
 public class MetricsController : Controller
{
    #region Index method

    /// <summary>  
    /// GET: Home/Index method.  
    /// </summary>  
    /// <returns>Returns - index view page</returns>   
    public ActionResult Index()
    {
        // Info.  
        return this.View();
    }

    #endregion

    #region Get data method.

    /// <summary>  
    /// GET: /Home/GetData  
    /// </summary>  
    /// <returns>Return data</returns>  
    public ActionResult GetData()
    {
        // Initialization.  
        JsonResult result = new JsonResult();

        try
        {
            // Loading.  
            List<Employee> data = this.LoadData();

            // Setting.  
            var graphData = data.GroupBy(p => new
            {
                p.FullName,
                p.HoursTaken,
                p.SickLeaveTaken
            })
                                .Select(g => new
                                {
                                    g.Key.FullName,
                                    g.Key.HoursTaken,
                                    g.Key.SickLeaveTaken
                                }).OrderByDescending(q => q.FullName).ToList();

            // Top 10  
            graphData = graphData.Take(10).Select(p => p).ToList();

            // Loading drop down lists.  
            result = this.Json(graphData, JsonRequestBehavior.AllowGet);
        }
        catch (Exception ex)
        {
            // Info  
            Console.Write(ex);
        }

        // Return info.  
        return result;
    }

    #endregion

    #region Helpers

    #region Load Data

    /// <summary>  
    /// Load data method.  
    /// </summary>  
    /// <returns>Returns - Data</returns>  
    private List<Employee> LoadData()
    {
        // Initialization.  
        List<Employee> lst = new List<Employee>();

        try
        {
            // Initialization.  
            string line = string.Empty;
            string srcFilePath = "Content/files/SalesOrderDetail.txt";
            var rootPath = Path.GetDirectoryName(Assembly.GetExecutingAssembly().CodeBase);
            var fullPath = Path.Combine(rootPath, srcFilePath);
            string filePath = new Uri(fullPath).LocalPath;
            StreamReader sr = new StreamReader(new FileStream(filePath, FileMode.Open, FileAccess.Read));

            // Read file.  
            while ((line = sr.ReadLine()) != null)
            {
                // Initialization.  
                Employee infoObj = new Employee();
                string[] info = line.Split(',');

                // Setting.  
                infoObj.FullName = info[3].ToString();
                infoObj.HoursTaken = Convert.ToDecimal(info[0].ToString());
                infoObj.SickLeaveTaken = Convert.ToDecimal(info[0].ToString());


                // Adding.  
                lst.Add(infoObj);
            }

            // Closing.  
            sr.Dispose();
            sr.Close();
        }
        catch (Exception ex)
        {
            // info.  
            Console.Write(ex);
        }

        // info.  
        return lst;
    }

    #endregion

    #endregion
}
}

Answer 1

我只是为此创建了数据库。

首先，您需要创建一个与SalesOrderDetail类进行映射的表

CREATE TABLE [dbo].[SalesOrderDetail](
    [Sr] [int] PRIMARY KEY NOT NULL,
    [OrderTrackNumber] [nvarchar](50) NULL,
    [Quantity] [int] NULL,
    [ProductName] [nvarchar](50) NULL,
    [SpecialOffer] [nvarchar](50) NULL,
    [UnitPrice] [decimal](18, 0) NULL,
    [UnitPriceDiscount] [decimal](18, 0) NULL,
)

第二，您创建一个ADO.NET实体数据模型。并添加代码以将数据从文件保存到数据库。更改“加载数据”方法中的代码

private List<SalesOrderDetail> LoadData()
        {
            // Initialization.
            List<SalesOrderDetail> lst = new List<SalesOrderDetail>();
            CustomerEntities ctx = new CustomerEntities();
            //lst = ctx.SalesOrderDetails.ToList();
            try
            {
                // Initialization.
                string line = string.Empty;
                string srcFilePath = "Content/files/SalesOrderDetail.txt";
                var rootPath = Path.GetDirectoryName(Assembly.GetExecutingAssembly().CodeBase);
                var fullPath = Path.Combine(rootPath, srcFilePath);
                string filePath = new Uri(fullPath).LocalPath;
                StreamReader sr = new StreamReader(new FileStream(filePath, FileMode.Open, FileAccess.Read));

                // Read file.
                while ((line = sr.ReadLine()) != null)
                {
                    // Initialization.
                    SalesOrderDetail infoObj = new SalesOrderDetail();
                    string[] info = line.Split(',');

                    // Setting.
                    infoObj.Sr = Convert.ToInt32(info[0].ToString());
                    infoObj.OrderTrackNumber = info[1].ToString();
                    infoObj.Quantity = Convert.ToInt32(info[2].ToString());
                    infoObj.ProductName = info[3].ToString();
                    infoObj.SpecialOffer = info[4].ToString();
                    infoObj.UnitPrice = Convert.ToDecimal(info[5].ToString());
                    infoObj.UnitPriceDiscount = Convert.ToDecimal(info[6].ToString());

                    // Adding.
                    lst.Add(infoObj);
                    ctx.SalesOrderDetails.Add(infoObj);

                }

                ctx.SaveChanges();

                // Closing.
                sr.Dispose();
                sr.Close();
            }
            catch (Exception ex)
            {
                // info.
                Console.Write(ex);
            }

            // info.
            return lst;
        }

第一次运行后，将文本文件中的数据插入到DB中，然后注释掉代码以从文件中获取数据，并插入代码行lst = ctx.SalesOrderDetails.ToList();以从DB中读取。

private List<SalesOrderDetail> LoadData()
        {
            // Initialization.
            List<SalesOrderDetail> lst = new List<SalesOrderDetail>();
            CustomerEntities ctx = new CustomerEntities();
            lst = ctx.SalesOrderDetails.ToList();
            try
            {
                // Initialization.
                //string line = string.Empty;
                //string srcFilePath = "Content/files/SalesOrderDetail.txt";
                //var rootPath = Path.GetDirectoryName(Assembly.GetExecutingAssembly().CodeBase);
                //var fullPath = Path.Combine(rootPath, srcFilePath);
                //string filePath = new Uri(fullPath).LocalPath;
                //StreamReader sr = new StreamReader(new FileStream(filePath, FileMode.Open, FileAccess.Read));

                //// Read file.
                //while ((line = sr.ReadLine()) != null)
                //{
                //    // Initialization.
                //    SalesOrderDetail infoObj = new SalesOrderDetail();
                //    string[] info = line.Split(',');

                //    // Setting.
                //    infoObj.Sr = Convert.ToInt32(info[0].ToString());
                //    infoObj.OrderTrackNumber = info[1].ToString();
                //    infoObj.Quantity = Convert.ToInt32(info[2].ToString());
                //    infoObj.ProductName = info[3].ToString();
                //    infoObj.SpecialOffer = info[4].ToString();
                //    infoObj.UnitPrice = Convert.ToDecimal(info[5].ToString());
                //    infoObj.UnitPriceDiscount = Convert.ToDecimal(info[6].ToString());

                //    // Adding.
                //    lst.Add(infoObj);
                //    ctx.SalesOrderDetails.Add(infoObj);

                //}

                //ctx.SaveChanges();

                // Closing.
                //sr.Dispose();
                //sr.Close();
            }
            catch (Exception ex)
            {
                // info.
                Console.Write(ex);
            }

            // info.
            return lst;
        }

您可以在以下位置下载源代码 https://github.com/viethien/MVC5GoogleGraph

首先使用ASP.NET MVC数据库实现Google Chart API

1 个答案: