Figure 43 Hierarchical Data Viewing Form in VS .NET

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Figure 43 Hierarchical Data Viewing Form
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The first and second sibling data tables have foreign keys into the grandparent data, and the grandchild data has foreign keys into the first sibling data When a row is selected in the GrandParentSet table, the sibling tables update to only show those rows related to the currently selected grandparent row Likewise, when a row is selected in the first sibling table, the grandchild table updates to only show the related grandchild rows This is all accomplished by chaining the binding sources Listing 42 shows the code used to set up the data binding
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Listing 42 Master-Details Binding Source Chaining
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partial class MasterDetailsChainingForm : Form { MasterDetailsChainingDataSet m_Data =
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new MasterDetailsChainingDataSet(); BindingSource m_GrandParentBindingSource = new BindingSource(); BindingSource m_FirstSiblingBindingSource = new BindingSource(); BindingSource m_SecondSiblingBindingSource = new BindingSource(); BindingSource m_GrandChildBindingSource = new BindingSource(); public MasterDetailsChainingForm() { InitializeComponent(); InitData(); m_GrandParentBindingSourceDataSource = m_Data; m_GrandParentBindingSourceDataMember = "GrandParentSet"; m_GrandParentGridDataSource = m_GrandParentBindingSource; m_FirstSiblingBindingSourceDataSource = m_GrandParentBindingSource; m_FirstSiblingBindingSourceDataMember = "FK_GrandParentSet_FirstSiblingSet"; m_FirstSiblingGridDataSource = m_FirstSiblingBindingSource; m_SecondSiblingBindingSourceDataSource = m_GrandParentBindingSource; m_SecondSiblingBindingSourceDataMember = "FK_GrandParentSet_SecondSiblingSet"; m_SecondSiblingGridDataSource = m_SecondSiblingBindingSource; m_GrandChildBindingSourceDataSource = m_FirstSiblingBindingSource; m_GrandChildBindingSourceDataMember = "FK_FirstSiblingSet_GrandChildSet"; m_GrandChildGridDataSource = m_GrandChildBindingSource; } private void InitData() { } }
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The InitData method programmatically populates the data set with several rows per table, with appropriate foreign key values from the child rows to the parent rows to set up the master-details relations You can see that there is a separate binding source per data grid, and they are set up as described earlier in this section The top-level binding source for the entire parental hierarchy is set with its data source to the GrandParentSet data table The first and second sibling binding sources are each set to have the grandparent binding source as their data source, and the data member is set to the data relation's name that ties the child table to the parent table For example, for the first sibling this is the FK_GrandParentSet_FirstSiblingSet relation The grandchild binding source is set to have the first sibling binding source as its data source, and its data member is set to the FK_FirstSiblingSet_GrandChildSet data relation You can use the same approach of chaining binding sources for binding to object collections that are hierarchical Consider the object definitions in Listing 43
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Listing 43 Hierarchical Object Definitions
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public class ParentObject { private BindingList<ChildObject> m_Children = new BindingList<ChildObject>(); private string m_Greeting = "Hello there"; public string Greeting { get { return m_Greeting; } set { m_Greeting = value; } } public BindingList<ChildObject> Children { get { return m_Children; } set { m_Children = value; } } } public class ChildObject { private int m_DataItem1 = 42; private string m_DataItem2 = "yadda"; public ChildObject() { } public ChildObject(int i, string s) { m_DataItem1 = i; m_DataItem2 = s; } public string DataItem2 { get { return m_DataItem2; } set { m_DataItem2 = value; } } public int DataItem1 { get { return m_DataItem1; } set { m_DataItem1 = value; } } }
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Because there is a parent-child relationship represented by the Children collection on the parent object, you can use that for master-details data binding through a binding source as well You could add two grids and two binding sources to a form, create a collection of the parent objects, and then data bind in a similar fashion to what you do when the data collections are tables: partial class Form1 : Form { ParentObject[] pos = new ParentObject[2]; public Form1() { InitializeComponent(); // Bind grids m_ParentGridDataSource = m_ParentBindingSource; m_ChildGridDataSource = m_ChildBindingSource; // Create data objects
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This document was created by an unregistered ChmMagic, please go to http://wwwbisentercom to register it Thanks pos[0] = new ParentObject(); pos[1] = new ParentObject(); pos[0]ChildrenAdd(new ChildObject()); pos[1]ChildrenAdd(new ChildObject(1,"foo")); // Bind connectors m_ParentBindingSourceDataSource = pos; m_ChildBindingSourceDataSource = m_ParentBindingSource; m_ChildBindingSourceDataMember = "Children"; } }
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The key concept here is knowing that you need to set the data source for the parent binding source to be the parent object collection (in this case, an array held by the form), and the data source for the child binding source to reference the parent binding source Then the data member of the child binding source needs to be the name of the property on the parent object that is a reference to the child collection In this case, that is the Children property, which is of type BindingList<ChildObject> BindingList<T> is a generic collection type in NET 20 that is specifically designed for Windows Forms data binding ChildObject is the type parameter that specifies what type of object the collection will contain You can use this technique of chaining together binding sources to support arbitrarily deep hierarchies of parent and child data and their bound controls
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