Question

我是MVVM模式的新手。我已经创建了MVVM模式，我必须将列表填充到树视图控件中。我有视图，视图模型和Model.I已经通过硬编码在模型中填充数据。但是现在我想要将我的MS Access数据表连接到Model中的列表而不是硬编码数据。我创建了DAL lier并连接了我的MS Access数据表，如下所示：

        using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.OleDb;
using System.Configuration;
using System.Data;
namespace DAL2
{
    public class PersonalDAL
    {
       // static String _ConnectionString = ConfigurationManager.ConnectionStrings["ConnectionStr"].ConnectionString;
        OleDbConnection con = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\\faisal\\Xerox2014\\wpf\\WPFHierarchy\\IconnectDB.accdb");

        public DataTable loademp( )
        {
            con.Open();
            OleDbDataAdapter sda = new OleDbDataAdapter("select * from empTable", con);
            DataTable dt = new DataTable();
            sda.Fill(dt);


            con.Close();
            return dt;
        }
    }

}

这里loademp方法将返回数据表。在模型中我只是想填写列表。我遇到的代码就在这里：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml.Linq;
using DAL2;
using System.Data;

namespace DevLake.OrgChart.UI.Model
{
    class OrgChartManager
    {
        private static OrgChartManager self;

        //orgchart stored in dictionary
        private Dictionary<int, Node> list = new Dictionary<int, Node>();

        private OrgChartManager()
        {

           DataTable my_datatable = new DataTable();
        my_datatable = new PersonalDAL().loademp();
            int ColumnCount = my_datatable.Columns.Count;
            foreach (DataRow dr in my_datatable.Rows)
            {
                list.Add(dr);
               //******here I get stuck and throw syntax error on this line


            }


            //hard coded populate data
                // list.Add(1, new Node { Id = 1, FirstName = "Joe", LastName =                                                       "Smith", ParentId = 1 });
            //list.Add(2, new Node { Id = 2, FirstName = "Rich", LastName =    "Angel", ParentId = 1 });
                 //list.Add(3, new Node { Id = 3, FirstName = "Mary", LastName = "Peach", ParentId = 1 });

这里我无法填写列表它抛出语法错误。任何正文可以帮助我如何用数据表数据填充我的列表。我的MS Access表看起来像这样：

ID  FirstName   LastName    ParentId
1   Joe Smith   1
10  Grey    Peech   9
11  Manny   Travel  9
2   Rich    Angel   1
3   Mary    Peach   1
4   Mike    Door    2
5   Jimmy   Fond    2
6   Ann Brown   4
7   George  Farm    4
8   Able    Jump    4
9   Corn    Shaw    1

我能够连接数据库并将数据表带到我的模型中，但是将数据表数据填入列表是我卡住的地方..请帮助我的朋友

我的节点类：

    class Node
    {
        public int Id { get; set; }

        public string FirstName { get; set; }

        public string LastName { get; set; }

        public int ParentId { get; set; }

    }
}

    Drow donw item contro within the data contarol

  https://scikit-learn.org/stable/

https://www.codemag.com/Article/1407051/Python-for-C

Answer 1

        foreach (DataRow dr in my_datatable.Rows)
        {
            Node node = new Node
            {
                 Id = (int)dr["ID"]
                 FirstName = (string)dr["FirstName"],
                 LastName = (string)dr["LastName"],
                 ParentId = (int)dr["ParentId"]
            };
            list[node.Id] = node;
        }

从数据表添加到字典记录

1 个答案: