TreeView can be bound with self-referencing data, that is, a single table or a list instead of multiple related tables or lists. With self-referencing data, the Parent-Child relationship for the records is set by defining KeyField and ParentKeyField properties where the Key field is used to identify the records and the ParentKey field is used to set the parent-child relationship. Here, the KeyField property sets a value specifying the key field of the data source bound to the TreeView control, while the ParentKeyField property sets a value representing the data source field identifying the parent record in the data source.

In the following example, we set the data source named EmployeesSelfRefDataSet and add columns to be displayed in the TreeView. Then, we created the parent-child relation between the records of the data source by setting KeyField and ParentKeyField properties to the ID and ChiefID fields respectively, in the data source as shown in the following code.

To check the data in EmployeesSelfRefDataSet class, see TreeView product sample in the corresponding .NET version folder at Documents\ComponentOne Samples\WinForms\vx.x\TreeView\CS\BoundModeWithDataSet\Employees location on your system. You can also refer the BoundModeWithDataSet sample to view the code.

//自己参照データセットをロードします
private void LoadDataSet()
{
    ClearTreeView();

    //列を追加します
    var column = new C1TreeColumn();
    column.DisplayFieldName = "Post";
    column.HeaderText = "Post";
    c1TreeView1.Columns.Add(column);
    column = new C1TreeColumn();
    column.DisplayFieldName = "FirstName";
    column.HeaderText = "First name";
    c1TreeView1.Columns.Add(column);
    column = new C1TreeColumn();
    column.DisplayFieldName = "LastName";
    column.HeaderText = "Last name";
    c1TreeView1.Columns.Add(column);

    //キーと親キーフィールドを設定します
    c1TreeView1.BindingInfo.KeyField = "ID";
    c1TreeView1.BindingInfo.ParentKeyField = "ChiefID";

    //データソースを設定します
    c1TreeView1.BindingInfo.DataMember = "Employees";
    c1TreeView1.BindingInfo.DataSource = SamplesData.EmployeesSelfRefDataSet.GetData();

}