C# 使用单一责任原则-SOLID-SRP重新分解程序
我正在扎实地学习,我正在努力理解单一责任原则 WalkingData类存储日期和步行距离。该类还读取存储的数据C# 使用单一责任原则-SOLID-SRP重新分解程序,c#,solid-principles,single-responsibility-principle,C#,Solid Principles,Single Responsibility Principle,我正在扎实地学习,我正在努力理解单一责任原则 WalkingData类存储日期和步行距离。该类还读取存储的数据 public class WalkingData { public DateTime Date { get; set; } public int WalkedDistance { get; set; } private string _filePath = @"c:\Data\Json.txt"; //Read
public class WalkingData
{
public DateTime Date { get; set; }
public int WalkedDistance { get; set; }
private string _filePath = @"c:\Data\Json.txt";
//Read Data from Json File
public List<WalkingData> GetAll()
{
//If file does not exist returns an empty list
if (!File.Exists(_filePath)) return new List<WalkingData>();
string jsonData;
//Read the existing Json file
using (StreamReader readtext = new StreamReader(_filePath))
{
jsonData = readtext.ReadToEnd();
}
//Deserialize the Json and returs a list of WalkingData
return JsonConvert.DeserializeObject<List<WalkingData>>(jsonData);
}
//save an instance of WalkingData in Json file
public void Save()
{
List<WalkingData> lstExistingWalkingData = new List<WalkingData>();
//if existing data, load it into lstExistingWalkingData
if (File.Exists(_filePath))
lstExistingWalkingData = GetAll();
//Add the current instace into lstExistingWalkingData
lstExistingWalkingData.Add(this);
//Serialize lstExistingWalkingData
string output = JsonConvert.SerializeObject(lstExistingWalkingData);
//Save the Json file
using (StreamWriter w = new StreamWriter(_filePath))
{
w.WriteLine(output);
}
}
}
在我应用单一责任原则后,我有了新的准则,我想确认我是否以合理的方式应用了该原则:
//This class is located on a library called BOL and has a reference to DAL library
public class WalkingData
{
public DateTime Date { get; set; }
public int WalkedDistance { get; set; }
}
//This class is located on a library called BOL and has a reference to DAL library
public class WalkingDataManager
{
WalkingDataRepository walkingDataRepository = new WalkingDataRepository();
public List<WalkingData> GetAll()
{
return walkingDataRepository.GetAll();
}
public void Save(WalkingData walkingData)
{
walkingDataRepository.Save(walkingData);
}
}
//this class is located in library Called DAL
internal class WalkingDataRepository
{
private string _filePath = @"c:\Data\Json.txt";
//Read Data from Json File
internal List<WalkingData> GetAll()
{
//If file does not exist returns an empty list
if (!File.Exists(_filePath)) return new List<WalkingData>();
string jsonData;
//Read the existing Json file
using (StreamReader readtext = new StreamReader(_filePath))
{
jsonData = readtext.ReadToEnd();
}
//Deserialize the Json and returs a list of WalkingData
return JsonConvert.DeserializeObject<List<WalkingData>>(jsonData);
}
//save an instance of WalkingData in Json file
internal void Save(WalkingData walkingData)
{
List<WalkingData> lstExistingWalkingData = new List<WalkingData>();
//if existing data, load it into lstExistingWalkingData
if (File.Exists(_filePath))
lstExistingWalkingData = GetAll();
//Add the current instace into lstExistingWalkingData
lstExistingWalkingData.Add(walkingData);
//Serialize lstExistingWalkingData
string output = JsonConvert.SerializeObject(lstExistingWalkingData);
//Save the Json file
using (StreamWriter w = new StreamWriter(_filePath))
{
w.WriteLine(output);
}
}
}
您分离了保存数据WalkingDataRepository的责任,并将其封装在WalkingDataManager中。重构工作完全符合SRP的说法。简而言之,SRP不仅仅是要分解功能,还要封装它们!我也很担心
困扰我的是WalkingData模型。这是一种反模式。你应该更愿意让数据处理维护自己的数据的责任,而不是创建另一个类WalkDATAMAMANER来完成这项工作。检查帮助页面,看看这样的问题是否适合问和考虑做。快速一个不要使用新关键字。记住,新的是胶水。使用DI解决您的依赖关系。