devexpress 中的树视图 Datagridview

Question

我多次尝试创建 table 的主视图及其详细信息，并在 Gridcontrol 中可视化（来自 Devexpress）这是代码 *我不想依赖Devexpress设计师自动生成代码！

        ' DEFINE A DATASET TO HOLD TABLES INSIDE
        Dim dataset As New DataSet

        'IF THE CONNECTION IS POSSIBLE THEN PROCCEED
        If sqlcontrol.HasConnection Then
            ' SELECT ALL RECORDS FROM THE SUPPLIERS TABLE (MASTER TABLE)
            sqlcontrol.ExecQuery("SELECT * FROM [Suppliers]")
            ' FILL IN THAT TABLE INTO THE DATASET
            dataset.Tables.Add(sqlcontrol.SQLdatatable)
            ' SELECT ALL RECORDS FROM THE SUPPLIERSPERSONNEL (DETAIL TABLE)
            sqlcontrol.ExecQuery("SELECT * FROM [SuppliersPersonnel]")
            'FILL IN THAT TABLE INTO THE DATASET
            dataset.Tables.Add(sqlcontrol.SQLdatatable)



            'INVOKE THE BINDING SOURCE INTO THE GRIDVIEW
            Me.GridControl1.DataSource = dataset
        End If

希望它能工作，但不像主从视图。它单独显示了每个 table。

Answer 1

数据集本身确实包含表，但是表之间的关系丢失并且没有从 SQL 表中检索，因此为什么需要在 VB 中的数据集中添加这种关系. 所以代码如下：

    ' DEFINE A DATASET TO HOLD TABLES INSIDE
    Dim dataset As New DataSet

    'IF THE CONNECTION IS POSSIBLE THEN PROCCEED
    If sqlcontrol.HasConnection Then
        ' SELECT ALL RECORDS FROM THE SUPPLIERS TABLE (MASTER TABLE)
        sqlcontrol.ExecQuery("SELECT * FROM [Suppliers]")
        ' FILL IN THAT TABLE INTO THE DATASET
        dataset.Tables.Add(sqlcontrol.SQLdatatable)
        ' SELECT ALL RECORDS FROM THE SUPPLIERSPERSONNEL (DETAIL TABLE)
        sqlcontrol.ExecQuery("SELECT * FROM [SuppliersPersonnel]")
        'FILL IN THAT TABLE INTO THE DATASET
        dataset.Tables.Add(sqlcontrol.SQLdatatable)

       'Add the relation to the dataset
        dataset.relations.add("CustomRelation", 
                    dataset.tables(0).columns(0),
                       dataset.tables(1).columns(1), false)

        'INVOKE THE BINDING SOURCE INTO THE GRIDVIEW
        Me.GridControl1.DataSource = dataset
    End If

通过这种方式，Gridcontrol 将按预期工作！

devexpress 中的树视图 Datagridview

Tree View Datagridview in devexpress

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