Question

我正在开发一个C＃程序，它将学生姓名，学号，单元号，单元名，标记和出勤存储在一个数组中。所有数据都显示在ListView中。如何从阵列中保存数据，然后使用加载按钮重新填充阵列？提前谢谢。

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Answer 1

在这种情况下，

数组不适用。而是使用列表。

private List<Student> students = new List<Student>();
private void insert(string StudentNumber, string StudentName, string UnitNumber, string UnitName, string Mark, string combobox)
{
   Student s = new Student
   {
     StudentNumber =StudentNumber,
     StudentName =StudentName,
     UnitNumber =UnitNumber
     UnitName =UnitName,
     Mark = Mark
     Combobox = combobox
   };
  students.Add(s);
}


public class Student
{
  public string StudentNumber{get; set;}
  public string StudentName {get; set;}
  public string UnitNumber {get; set;}
  public string UnitName {get; set;}
  public string Mark {get; set;}
  public string Combobox {get;set;}
}

Answer 2

按照以下步骤

添加扩展方法以将对象转换为xml

ExtensionMethods类

public static class ExtensionMethods
{
    /// <summary>
    /// Converts given class to XML using xml serialization
    /// </summary>
    /// <typeparam name="T">Type of Class</typeparam>
    /// <param name="classObject">Class to be serialized</param>
    /// <returns>Xml string</returns>
    public static string ToXML<T>(this T classObject) where T : class
    {
        XmlSerializer xmls = new XmlSerializer(typeof(T));
        using (MemoryStream ms = new MemoryStream())
        {
            XmlWriterSettings settings = new XmlWriterSettings();
            settings.Encoding = new UTF8Encoding(false);
            settings.Indent = true;
            settings.IndentChars = "\t";
            settings.NewLineChars = Environment.NewLine;
            settings.OmitXmlDeclaration = true;
            settings.ConformanceLevel = ConformanceLevel.Document;
            using (XmlWriter writer = XmlTextWriter.Create(ms, settings))
            {
                xmls.Serialize(writer, classObject);
            }

            string xml = Encoding.UTF8.GetString(ms.ToArray());
            return xml;
        }
    }

    /// <summary>
    /// Converts given XML string to class of type T
    /// </summary>
    /// <typeparam name="T">Type to be converted</typeparam>
    /// <param name="XmlData">xml string</param>
    /// <returns>class of Type T</returns>
    public static T ToClass<T>(this string XmlData)
    {
        XmlSerializer serializer = new XmlSerializer(typeof(T));
        T newClass;
        using (XmlTextReader reader = new XmlTextReader(new StringReader(XmlData)))
        {
            //reader.Namespaces = false;
            newClass = (T)serializer.Deserialize(reader);
        }
        return newClass;
    }
}

创建一个容纳学生信息的课程

学生班

public class Student
{
  public string StudentNumber{get; set;}
  public string StudentName {get; set;}
  public string UnitNumber {get; set;}
  public string UnitName {get; set;}
  public string Mark {get; set;}
  public string Combobox {get;set;}
}

在表单加载检查中是否存在文件

表单加载

    //declare global variable for student list and filepath
    List<Student> students = new List<Student>();
    string FilePath = AppDomain.CurrentDomain.BaseDirectory + "\\" + Path.GetFileNameWithoutExtension(AppDomain.CurrentDomain.FriendlyName) + ".xml";
    private void Form1_Load(object sender, EventArgs e)
      {

            string XmlData = string.Empty;
            if (File.Exists(FilePath))
            {
                using (StreamReader sr = new StreamReader(FilePath))
                {
                    XmlData = sr.ReadToEnd(); 
                }
                students = XmlData.ToClass<List<Student>>();
            }      
      }

在插入，更新和删除操作中将xml文件保存到文件系统

保存xml

string XmlData = students.ToXML();
File.WriteAllText(FilePath, XmlData);

C＃从数组中保存并重新填充数据

2 个答案: