Question

我的DataGridViews都正确显示父记录和子记录。我还可以成功添加子记录并将它们保存回我的数据源（XML文件）。但是，当我尝试添加新的父级和子级时，我的程序会抛出一个异常，说明即使它们存在于详细DataGridView中，也没有要添加的子记录。

所以，问题是我的孩子记录在新的时候没有被绑定到班级。我错过了什么？

我的课程结构如下：

public class Roads
{
   public string RoadName { get; set; }
   public List<CrossStreet> CrossStreets { get; set; }        
}

public class CrossStreet
{
   public string CrossStreetName { get; set;}
}

我有2个DataGridViews，我将我的类绑定到它们：

BindingSource roadBindingSource = new BindingSource();
BindingSource crossStreetBindingSource = new BindingSource();

// _roads contains both the road and cross street data.
roadBindingSource.DataSource = _roads;

crossStreetBindingSource.DataSource = roadBindingSource;
crossStreetBindingSource.DataMember = "CrossStreets";

dataGridViewRoads.DataSource = roadsBindingSource;
dataGridViewCrossStreets.DataSource = crossStreetBindingSource;

Answer 1

问题是我的班级实施。而不是：

public class Roads
{
   public string RoadName { get; set; }
   public List<CrossStreet> CrossStreets { get; set; }        
}

public class CrossStreet
{
   public string CrossStreetName { get; set;}
}

我用过：

public class Roads
{
   private List<CrossStreets> _crossStreets = new List<CrossStreets>();
   public string RoadName { get; set; }
   public List<CrossStreet> CrossStreets { get { return _crossStreets;} }        
}

public class CrossStreet
{
   public string CrossStreetName { get; set;}
}

主 - 细节/绑定源问题

1 个答案: