Question

我正在创建一个应用程序，它从文本框中获取值并将它们保存到2D列表中。我得到它将列表保存到xml文件，但我无法将其添加回列表中。该属性存在。我使用了一个消息框弹出窗口来查看它是否正确地检索了属性。但出于某种原因，它没有将其添加到列表中。事实上，它甚至没有将其他信息加载到列表视图中。

    public void Load(RadListView listView, List<List<double>> list)
    {
        XDocument doc = XDocument.Load(Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), "RentData.xml"));
        foreach (var dm in doc.Descendants("Month"))
        {
            ListViewDataItem item = new ListViewDataItem();
            foreach (XElement x in dm.Descendants())
            {

                List<double> sublist = new List<double>();
                sublist.Capacity = 6;
                if (x.Name == "Mike")
                {
                    sublist.Insert(0, Convert.ToDouble(x.Attribute("Rent").Value));
                    sublist.Insert(2, Convert.ToDouble(x.Attribute("Internet").Value));
                    sublist.Insert(4, Convert.ToDouble(x.Attribute("Electricty").Value));
                    sublist.Insert(6, Convert.ToDouble(x.Attribute("Water").Value));
                }
                else if (x.Name == "Patti")
                {
                    sublist.Insert(1, Convert.ToDouble(x.Attribute("Rent").Value));
                    sublist.Insert(3, Convert.ToDouble(x.Attribute("Internet").Value));
                    sublist.Insert(5, Convert.ToDouble(x.Attribute("Electricty").Value));
                    sublist.Insert(7, Convert.ToDouble(x.Attribute("Water").Value));
                }
                else
                {
                     item.SubItems.Add(x.Value); 
                }
                list.add(sublist);
            }


            item.TextAlignment = ContentAlignment.MiddleCenter;
            listView.Items.Add(item);
        }
    }

编辑：Xml文件

<?xml version="1.0" encoding="utf-8"?>
<!--Rent Calculator Save Data-->
<Rent>
  <Month>
    <Date>01/15/2015</Date>
    <Rent>$100.00</Rent>
    <Internet>$110.00</Internet>
    <Water>$120.00</Water>
    <Electricity>$130.00</Electricity>
    <totalExepense>$460.00</totalExepense>
    <Payments>
      <Patti Water="60" Electricity="65" Internet="55" Rent="50" />
      <Mike Water="60" Electricity="65" Internet="55" Rent="50" />
    </Payments>
  </Month>
</Rent>

用于写入xml的代码：

public void Write(RadListView listView, List<List<double>> list)
    {
        XmlWriterSettings settings = new XmlWriterSettings() { Indent = true };
        XmlWriter writer = XmlWriter.Create(Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), "RentData.xml"), settings);
        writer.WriteStartDocument();
        writer.WriteComment("Rent Calculator Save Data");            
        writer.WriteStartElement("Rent");
        for (int a = 0; a < listView.Items.Count; a++ )
        {
            foreach (ListViewDataItem i in listView.Items)
            {
                writer.WriteStartElement("Month");
                writer.WriteElementString("Date", i[0].ToString());
                writer.WriteElementString("Rent", i[1].ToString());
                writer.WriteElementString("Internet", i[2].ToString());
                writer.WriteElementString("Water", i[3].ToString());
                writer.WriteElementString("Electricity", i[4].ToString());
                writer.WriteElementString("totalExepense", i[5].ToString());
                writer.WriteStartElement("Payments");
                writer.WriteStartElement("Patti");
                writer.WriteAttributeString("Water", list[a][6].ToString());
                writer.WriteAttributeString("Electricity", list[a][4].ToString());
                writer.WriteAttributeString("Internet", list[a][2].ToString());
                writer.WriteAttributeString("Rent", list[a][0].ToString());
                writer.WriteEndElement();
                writer.WriteStartElement("Mike");
                writer.WriteAttributeString("Water", list[a][7].ToString());
                writer.WriteAttributeString("Electricity", list[a][5].ToString());
                writer.WriteAttributeString("Internet", list[a][3].ToString());
                writer.WriteAttributeString("Rent", list[a][1].ToString());
                writer.WriteEndElement();
                writer.WriteEndElement();
                writer.WriteEndElement();
            }
        }
        writer.WriteEndDocument();
        writer.Flush();
        writer.Close();
    }

Answer 1

请纠正以下事项。

按如下方式初始化列表

列表与LT;双＆gt; sublist = new List＆lt; double＆gt;（）{0,0,0,0,0,0};
＆＃34;有掉电＆＃34;拼写错误。修复xml。

Answer 2

这是您可能更喜欢的替代方法。

var listOfListOfDouble =
    doc
        .Descendants("Month")
        .Select(m =>
        {
            var d = m
                    .Elements("Payments")
                    .Elements()
                    .ToDictionary(
                        p => p.Name.LocalName,
                        p => p.Attributes()
                            .ToDictionary(
                                x => x.Name.LocalName,
                                x => (double)x));
            return new []
            {
                d["Mike"]["Rent"],
                d["Patti"]["Rent"],
                d["Mike"]["Internet"],
                d["Patti"]["Internet"],
                d["Mike"]["Electricity"],
                d["Patti"]["Electricity"],
                d["Mike"]["Water"],
                d["Patti"]["Water"],
            }.ToList();
        })
        .ToList();

它适用于您提供的数据并返回List<List<double>>。

如何将xml属性读入2d列表List <list <double>＆gt; </list <double>

2 个答案: