保存 IEnumerable 模型

Posted 2023-05-07

【中文标题】保存 IEnumerable 模型

【英文标题】：Saving an IEnumerable Model

【发布时间】：2012-10-26 19:38:56

【问题描述】：

我的视图有 2 个日期选择器，其中一个是开始日期，另一个是结束日期。我能够让用户选择开始和结束日期，重定向到一个视图，该视图将包含一个工作时间列表，用户可以在其中更改日期、输入时间，一旦完成，他们应该能够单击保存按钮，它应该创建一个每次工作到数据库的新实例。我的视图显示没有问题，但是当表单发布我的可枚举模型为空时，表单集合只有一个可访问的项目，我不知道为什么。请查看我在下面创建的视图，以了解我在做什么，如果您能以任何方式帮助我，请告诉我。

@model IEnumerable<TimeCollection.Models.TimeWorked>

@
    ViewBag.Title = "Create TimeWorked Range";


<h2>Create TimeWorked Range</h2>

@using (html.BeginForm()) 
    @Html.ValidationSummary(true)
<table>
    <tr>
        <th>
            @Html.DisplayNameFor(model => model.WorkDate)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.HoursWorked)
        </th>
    </tr>

@foreach (var item in Model) 
    <tr>
        @Html.HiddenFor(modelItem => item.EmployeeId)
        <td>
            @Html.EditorFor(modelItem => item.WorkDate)
        </td>
        <td>
            @Html.EditorFor(modelItem => item.HoursWorked)
        </td>
        <td>
            @Html.HiddenFor(modelItem => item.BeenSubmitted)
        </td>
    </tr>


</table>
    <p>
        <input type="submit" value="Save" />
    </p>


using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace TimeCollection.Models

    public class TimeWorked
    
        public int TimeWorkedId  get; set; 
        public int EmployeeId  get; set; 
        public DateTime WorkDate  get; set; 
        public int HoursWorked  get; set; 
        public bool BeenSubmitted  get; set; 

        public static void CreateTimeWorked(TimeWorked timeWorkedToCreate)
        
            string insertQuery = string.Format("insert into time_worked (employee_id, work_date, work_hours, been_submitted) values ('0', '1', '2', '3')", timeWorkedToCreate.EmployeeId, timeWorkedToCreate.WorkDate.ToString("yyyy/MM/dd"), timeWorkedToCreate.HoursWorked, (timeWorkedToCreate.BeenSubmitted == true ? "1" : "0"));
            SpectrumData.Utility.ExecutemysqlCommand(SpectrumData.Properties.Resources.SpectrumTSDatabaseConnectionString, insertQuery);
        

        public static TimeWorked ReadTimeWorked(int timeWorkedId)
        
            string selectQuery = string.Format("select * from time_worked where time_worked_id = '0'", timeWorkedId);
            return ConvertDataRowIntoTimeWorked(SpectrumData.Utility.FillDataSet(SpectrumData.Properties.Resources.SpectrumTSDatabaseConnectionString, selectQuery).Tables[0].Rows[0]);
        

        public static void UpdateTimeWorked(TimeWorked timeWorkedToUpdate)
        
            string updateQuery = string.Format("update time_worked set work_date = '0', work_hours = '1', been_submitted = '2' where time_worked_id = '2'", timeWorkedToUpdate.WorkDate, timeWorkedToUpdate.HoursWorked, timeWorkedToUpdate.BeenSubmitted, timeWorkedToUpdate.TimeWorkedId);
            SpectrumData.Utility.ExecuteMySqlCommand(SpectrumData.Properties.Resources.SpectrumTSDatabaseConnectionString, updateQuery);
        

        public static void DeleteTimeWorked(int timeWorkedId)
        
            string deleteQuery = string.Format("delete from time_worked where time_worked_id = '0'", timeWorkedId);
            SpectrumData.Utility.ExecuteMySqlCommand(SpectrumData.Properties.Resources.SpectrumTSDatabaseConnectionString, deleteQuery);
        

        private static TimeWorked ConvertDataRowIntoTimeWorked(System.Data.DataRow timeWorkedDataRow)
        
            TimeWorked timeWorked = new TimeWorked();
            timeWorked.BeenSubmitted = (timeWorkedDataRow["been_submitted"].ToString() == "1" ? true : false);
            timeWorked.EmployeeId = int.Parse(timeWorkedDataRow["employee_id"].ToString());
            timeWorked.HoursWorked = int.Parse(timeWorkedDataRow["work_hours"].ToString());
            timeWorked.TimeWorkedId = int.Parse(timeWorkedDataRow["time_worked_id"].ToString());
            timeWorked.WorkDate = DateTime.Parse(timeWorkedDataRow["work_date"].ToString());

            return timeWorked;
        
    


 public ActionResult CreateTimeWorkedRange(DateTime startDate, DateTime endDate)
    
        List<Models.TimeWorked> listOfTimeWorked = new List<Models.TimeWorked>();
        DateTime beginning = startDate;
        DateTime ending = endDate;

        while (beginning <= ending)
        
            Models.TimeWorked dayWorked = new Models.TimeWorked()
            
                EmployeeId = (Session["InventoryReviewUser"] as SpectrumData.SpectrumTS.InventoryReviewUser).EmployeeId,
                WorkDate = beginning
            ;

            if (listOfTimeWorked.Contains(dayWorked) == false)
            
                listOfTimeWorked.Add(dayWorked);
            

            beginning = beginning.AddDays(1);
        

        return View(listOfTimeWorked);
    

    [HttpPost]
    public ActionResult CreateTimeWorkedRange(List<Models.TimeWorked> modelList)
    
        foreach (Models.TimeWorked timeWorked in modelList)
        
            Models.TimeWorked.CreateTimeWorked(timeWorked);
        
    

【参考方案1】：

我不知道是否有更好的方法，但一种方法是使用数组的索引绑定您的项目，如下所示：

@for (int i = 0; i < Model.Count; ++i) 
    <tr>
        @Html.HiddenFor(modelItem => Model[i].EmployeeId)
        <td>
            @Html.TextBoxFor(modelItem => Model[i].WorkDate)
        </td>
        <td>
            @Html.TextBoxFor(modelItem => Model[i].HoursWorked)
        </td>
        <td>
            @Html.HiddenFor(modelItem => Model[i].BeenSubmitted)
        </td>
    </tr>

您的模型需要不同的集合类型（IList<TimeWorked> 应该没问题）才能使用索引器，但这不应该是我想像的问题。发布时，集合应正确填写。