如何将文件的一部分读取到对象中

本文关键字：读取 对象 一部分 文件 | 更新日期: 2023-09-27 18:21:31

我有一个文件，我想扫描它，并将部分放入自定义对象中。

文件如下所示：

[Student]
Name=John
LastName=Doe 
Username=user1
Password=pass1
[Teacher]
Name=Jane
LastName=Doe
Username=user2
Password=pass2
[Manager]
Name=Jason
LastName=Doe
Username=user3
Password=pass3

我有一个Profile类，看起来是这样的：

public class Profile
{
    public string studentName       { get; set; }
    public string studentLastName   { get; set; }
    public string studentUsername   { get; set; }
    public string studentPassword   { get; set; }
    public string teacherName       { get; set; }
    public string teacherLastName   { get; set; }
    public string teacherUsername   { get; set; }
    public string teacherPassword   { get; set; }
}

所以，我只需要让学生和老师进入配置文件对象。以下是我开始的方式：

public Profile readFile(string filename)
{
     var profile = new Profile();
     using (StreamReader sr = new StreamReader(filename))
     {
         while (!sr.EndOfStream)
         {
             String line = sr.ReadLine();
             if (line != null && line.Contains("Student"))
             {
                 // and I am stuck here, not sure how to find 
                 // the next lines, so i can take the values
                 // and put them in the profile 
              }
              if (line != null && line.Contains("Teacher"))
              {
                 // and I am stuck here, not sure how to find 
                 // the next lines, so i can take the values
                 // and put them in the profile 
              }
          }
      }
  }

如何将文件的一部分读取到对象中

您可以这样做：

var p=new Profile();
using (StreamReader sr = new StreamReader(filename))
{
    while (!sr.EndOfStream)
    {
        String line = sr.ReadLine();
        if (line != null && line.Contains("Student"))
        {
            p.studentName=GetLineValue(sr.ReadLine());
            p.studentLastName=GetLineValue(sr.ReadLine());
            p.studentUsername=GetLineValue(sr.ReadLine());
            p.studentPassword=GetLineValue(sr.ReadLine());
        }
        if (line != null && line.Contains("Teacher"))
        {
            p.teacherName=GetLineValue(sr.ReadLine());
            p.teacherLastName=GetLineValue(sr.ReadLine());
            p.teacherUsername=GetLineValue(sr.ReadLine());
            p.teacherPassword=GetLineValue(sr.ReadLine());
        }
    }
}
private string GetLineValue(string line)
{
   return line.Substring(line.IndexOf('=')+1);
}

应该开始的伪代码位：

if (line != null && line.Contains("Student"))
{
  var temp = new Student();
  do {
      string temp_line = String line = sr.ReadLine();
      if //temp_line is empty
      {     
        // you got the line. split on "="
        // assign the student property to the value
        // you'll have to use a bit of reflection here, but shouldn't be too hard

      }
    } while // not empty string (which means you're ready for the next object)
}

我可能会把它们分解成简单地填充每个对象（学生/老师等）的方法

好处是你不依赖订单，如果你想的话，你可以添加"哦，那个属性不存在，跳过它"的代码。。。

您可以使用反射。像这个

    public static Profile readFile(string filename)
    {
        var profile = new Profile();
        var properties = typeof(Profile).GetProperties().ToDictionary(q => q.Name, q => q);
        using (StreamReader sr = new StreamReader(filename))
        {
            String mode = "";
            while (!sr.EndOfStream)
            {
                String line = sr.ReadLine();
                if (line == "[Student]")
                {
                    mode = "student";
                    // and I am stuck here, not sure how to find 
                    // the next lines, so i can take the values
                    // and put them in the profile 
                }
                else if (line == "[Teacher]")
                {
                    mode = "teacher";
                }
                else if (!string.IsNullOrEmpty(line))
                {
                    var nameValues = line.Split(new char[] { '=' }, 2);
                    if (nameValues.Length < 2)
                        continue;
                    var key = mode + nameValues[0];
                    if (properties.ContainsKey(key))
                    {
                        var value = nameValues[1];
                        properties[key].SetValue(profile, value);
                    }
                }
            }
        }
        return profile;
    }

您可以找到大括号，如下所示：

class memberLocation
{
    public int start, end;
}
class Program
{
    static void Main(string[] args)
    {
        memberLocation student, teacher, manager;
        student = new memberLocation();
        teacher = new memberLocation();
        manager = new memberLocation();
        String filePath = "data.txt";
        StreamReader sr = new StreamReader(filePath);
        String fileData = sr.ReadToEnd();
        student.start = fileData.IndexOf("[Student]");
        teacher.start = fileData.IndexOf("[Teacher]");
        manager.start = fileData.IndexOf("[Manager]");
        student.end = fileData.IndexOf(']', student.start + 9) - 9; // [Student] length = 9 - [Teacher] length
        teacher.end = fileData.IndexOf(']', teacher.start + 9) - 9; // [Teacher] length = 9
        manager.end = fileData.IndexOf(']', manager.start + 9) - 9; // [Manager] length = 9
        String studentStr, teacherStr, managerStr;
        if (student.end > 0)
            studentStr = fileData.Substring(student.start, student.end - student.start);
        else
            studentStr = fileData.Substring(student.start);
        if (teacher.end > 0)
            teacherStr = fileData.Substring(teacher.start, teacher.end - teacher.start);
        else
            teacherStr = fileData.Substring(teacher.start);
        if (manager.end > 0)
            managerStr = fileData.Substring(manager.start, manager.end - manager.start);
        else
            managerStr = fileData.Substring(manager.start);
    }
}
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