Question

有人会帮助我以下吗？我有两个DataGridView对象，每个对象都显示一个DataTable，其中两个数据表与以下代码相关：

DataSet dSet = new DataSet();
DataTable ParentList = ListToDataTable(_listOfAllAlbumObjects);
DataTable ChildList = ListToDataTable(_listOfAllTrackObjects);
dSet.Tables.AddRange(new DataTable[]{ParentList, ChildList});
DataColumn parentRelationColumn = ParentList.Columns["AlbumId"];
DataColumn childRelationColumn = ChildList.Columns["AlbumId"];
dSet.Relations.Add("ParentToChild", parentRelationColumn, childRelationColumn);
ParentDataGridView.DataSource = dSet;
ParentDataGridView.DataMember = "ParentList";
ChildDataGridView.DataSource = ???;
ChildDataGridView.DataMember = "ParentToChild";

两个DataTable实际上都是List＆lt;＆gt;使用以下内容转换为DataTables：`

    public static DataTable ListToDataTable<T>( IList<T> data)
    {
              var props = TypeDescriptor.GetProperties(typeof(T));
              var table = new DataTable();
              for (var i = 0; i < props.Count; i++)
              {
                  PropertyDescriptor prop = props[i];
                  table.Columns.Add(prop.Name, prop.PropertyType);
              }
              var values = new object[props.Count];
              foreach (T item in data)
              {
                  for (int i = 0; i < values.Length; i++) 
                  { values[i] = props[i].GetValue(item); }
                  table.Rows.Add(values);
              }
              return table;
          }

最初看起来每个DataGridView都会正确显示数据;但是，子DataGridView不会更新父DataGridView中的任何记录更改。

我看到表格需要通过绑定源互连;但是我不相信这里有真正的绑定源。

有人可以引导我朝正确的方向前进吗？感谢。

Answer 1

有一篇MSDN文章展示了你想要做的事情：

How to: Create a Master/Detail Form Using Two Windows Forms DataGridView Controls

以下是这对你有用的方法：

通过设计器或通过代码向项目中添加两个BindingSource：parentBindingSource和childBindingSource。然后试试这个代替你的代码。

// Associate your BSs with your DGVs.
ParentDataGridView.DataSource = parentBindingSource;
ChildDataGridView.DataSource = childBindingSource;

// (Most of) your code here:
DataSet dSet = new DataSet();
DataTable ParentList = ListToDataTable(_listOfAllAlbumObjects);
DataTable ChildList = ListToDataTable(_listOfAllTrackObjects);
dSet.Tables.AddRange(new DataTable[]{ParentList, ChildList});
DataColumn parentRelationColumn = ParentList.Columns["AlbumId"];
DataColumn childRelationColumn = ChildList.Columns["AlbumId"];
dSet.Relations.Add("ParentToChild", parentRelationColumn, childRelationColumn);

// Let's name this DT to make clear what we're referencing later on.
ParentList.TableName = "ParentListDT";

// Rather than set the data properties on your DGVs, set them in your BindingSources.
parentBindingSource.DataSource = dSet;
parentBindingSource.DataMember = "ParentListDT";

childBindingSource.DataSource = parentBindingSource;
childBindingSource.DataMember = "ParentToChild";

DataGridView - 父对象数据库关系 - 更新子DataGridView数据

1 个答案: