亂數據類中的數據綁定

Question

我試圖編輯鏈接到數據綁定的類內的一些數據。這裏是我的課：

public class Line 
{ 
    public string Equation { get; set; } 
    public int PreviousLine { get; set; } 
    public int LineNumber { get; private set; } 

    public Line() 
    { 
     this.LineNumber = (this.PreviousLine + 5); 
    } 
} 

但是行號總是返回5，即使前行設置爲6 ...

這裏是我如何鏈接到它在我的視圖模型中：

this.Lines.Add(new Line { Equation = "5*2", PreviousLine = 6 }); 

謝謝

Answer 1

private int _previousLine; 
    public int PreviousLine 
    { 
     get { return _previousLine; } 
     set { _previousLine = value; 
      Line = _previousLine + 5; 
     } 
    } 
    public int Line { get; private set; } 

Answer 2

嘗試將其聲明爲靜態。

public static int PreviousLine { get; set; }