c# 反射+自定义特性保存数据至本地

  public class ResultAttribute : Attribute
  {
    private bool _IsSave;
    /// <summary>
    /// 是否保存
    /// </summary>
    public bool IsSave
    {
      get { return _IsSave; }
      set { _IsSave = value; }
    }

    private string _SaveName;
    /// <summary>
    /// .csv文件第一行的名称
    /// </summary>
    public string SaveName
    {
      get { return _SaveName; }
      set { _SaveName = value; }
    }
  }

 public class TestResultModel:ViewModelBase
  {

    private int _TestNumber;
    /// <summary>
    /// 序号
    /// </summary>
    [EquationResult(SaveName = "序号", IsSave = true)]
    public int TestNumber
    {
      get { return _TestNumber; }
      set { _TestNumber = value; RaisePropertyChanged(); }
    }

    private string _TestResult;
    /// <summary>
    /// 测试结果
    /// </summary>
    [EquationResult(SaveName = "测试结果", IsSave = true)]
    public string TestResult
    {
      get { return _TestResult; }
      set { _TestResult = value; RaisePropertyChanged(); }
    }

    private DateTime _TestTime;
    /// <summary>
    /// 测试时间
    /// </summary>
    [EquationResult(SaveName = "测试时间", IsSave = true)]
    public DateTime TestTime
    {
      get { return _TestTime; }
      set { _TestTime = value; RaisePropertyChanged(); }
    }
						
    private string _MeterSn;
    /// <summary>
    /// 仪器SN号
    /// </summary>
    public string MeterSn
    {
      get { return _MeterSn; }
      set { _MeterSn = value; RaisePropertyChanged(); }
    }
  }	

 /// <summary>
    /// 获得要保存的数据
    /// </summary>
    /// <typeparam name="T"></typeparam>
    /// <param name="tClass"></param>
    /// <param name="IsHead">是不是第一行的表头</param>
    /// <returns></returns>
    private string GetSaveStr<T>(T tClass, bool IsHead = false) where T : class
    {
      StringBuilder sb = new StringBuilder();
      //msdn：GetProperties方法不按特定顺序（如字母顺序或声明顺序）返回属性。 你的代码不能依赖属性的返回顺序，因为该顺序会有所不同。 
      PropertyInfo[] infoarr = tClass.GetType().GetProperties();     
      foreach (var property in infoarr)
      {
        if (property.GetCustomAttribute(typeof(EquationResultAttribute), false) is EquationResultAttribute bute)
        {
          if (bute.IsSave && IsHead)
          {
            sb.Append(bute.SaveName + ",");
          }
          else if (bute.IsSave && !IsHead)
          {
            sb.Append(property.GetValue(tClass).ToString() + ",");
          }
          else
          {
            ;//无代码
          }
        }
      }
      return sb.ToString();
    }



    /// <summary>
    /// 保存测试信息
    /// </summary>
    /// <param name="listModel"></param>
    public void SaveTestDataToCsv(List<TestDataModel> listModel)
    {
      using (FileStream fs = new FileStream(CsvSavePath, FileMode.OpenOrCreate, FileAccess.Write))
      {
        using (StreamWriter sw = new StreamWriter(fs,Encoding.Default))
        {
          sw.BaseStream.Seek(0, SeekOrigin.Begin);      //设置流的起始位置为开始
          string data = GetSaveStr(listModel[0], true);    //写入第一行
          sw.WriteLine(data); //写入数据流
          sw.Flush();
          for (int i = 0; i < listModel.Count; i++)
          {
            sw.BaseStream.Seek(0, SeekOrigin.End);
            data = GetSaveStr(listModel[i]);
            sw.WriteLine(data); //写入数据流
            sw.Flush();
          }
        }
      }
    }