Spread for ASP.NET 13 Product Documentation
FarPoint.Web.Spread Assembly / FarPoint.Web.Spread.Model Namespace / DefaultSheetDataModel Class / ChildRelationCount Property
Example


In This Topic
    ChildRelationCount Property (DefaultSheetDataModel)
    In This Topic
    Gets the number of the child data relations for a hierarchical display of data.
    Syntax
    'Declaration
     
    Public ReadOnly Property ChildRelationCount As Integer
    'Usage
     
    Dim instance As DefaultSheetDataModel
    Dim value As Integer
     
    value = instance.ChildRelationCount
    public int ChildRelationCount {get;}

    Property Value

    Integer number of child relations
    Example
    This example creates a DefaultSheetDataModel and assigns it to the DataModel of the spreadsheet. The data source of the model is attached to some DataTables and the ParentRelationName and ParentRowIndex are returned to a list box.
    Private Sub Page_Load(ByVal sender As System.Object,ByVal e As System.EventArgs)Handles MyBase.Load
    
    If(IsPostBack)Then Return
    
    Dim ds As New System.Data.DataSet()
    Dim dm As New FarPoint.Web.Spread.Model.DefaultSheetDataModel()
    FpSpread1.ActiveSheetView.DataModel=dm
    FpSpread1.HierarchicalView=True
    
    Dim emp As DataTable=New DataTable("Employee")
    Dim dept As DataTable=New DataTable("Department")
    
    Dim lname As DataColumn = New DataColumn("LastName",GetType(System.String))
    Dim fname As DataColumn = New DataColumn("FirstName",GetType(System.String))
    
    Dim dname As DataColumn = New DataColumn("DeptName",GetType(System.String))
    Dim area As DataColumn = New DataColumn("Area",GetType(System.String))
    
    Dim id As DataColumn = emp.Columns.Add("ID",GetType(System.Int32))
    id.AutoIncrement=True
    Dim primarykey As DataColumn() = New DataColumn(){id}
    emp.PrimaryKey=primarykey
    emp.Columns.Add(lname)
    emp.Columns.Add(fname)
    
    id=dept.Columns.Add("ID",GetType(System.Int32))
    id.AutoIncrement=True
    dept.PrimaryKey = New DataColumn(){id}
    id.AutoIncrement=True
    Dim lang As DataColumn = dept.Columns.Add("Language",GetType(System.Int32))
    Dim foreignkey As DataColumn() = New DataColumn(){lang}
    dept.Columns.Add(dname)
    dept.Columns.Add(area)
    
    ds.Tables.Add(emp)
    ds.Tables.Add(dept)
    
    Dim ti As DataRow=emp.NewRow()
    ti(lname)="Bazemoreland"
    ti(fname)="Ti"
    emp.Rows.Add(ti)
    
    Dim ginny As DataRow=emp.NewRow()
    ginny(lname)="Danielson"
    ginny(fname)="Ginny"
    emp.Rows.Add(ginny)
    
    Dim bob As DataRow=emp.NewRow()
    bob(lname)="Morrison"
    bob(fname)="Bob"
    emp.Rows.Add(bob)
    
    Dim rel As DataRelation= New DataRelation("FarPoint",primarykey,foreignkey,False)
    ds.Relations.Add(rel)
    
    Dim row As DataRow=dept.NewRow()
    row("Language")=ti("ID")
    row(dname)="TechSupport"
    row(area)="C#"
    dept.Rows.Add(row)
    
    row=dept.NewRow()
    row("Language")=ginny("ID")
    row(dname)="TechSupport"
    row(area)="VB.Net"
    dept.Rows.Add(row)
    row=dept.NewRow()
    row("Language")=bob("ID")
    row(dname)="TechSupport"
    row(area)="C#"
    dept.Rows.Add(row)
    ds.AcceptChanges()
    dm.DataSource=ds
    dm.DataMember="Employee"
    
    Dim dm2 As FarPoint.Web.Spread.Model.DefaultSheetDataModel
    dm2=FpSpread1.Sheets(0).GetChildView(0,0).DataModel
    ListBox1.Items.Add(dm2.ParentRelationName)
    ListBox1.Items.Add(dm2.ParentRowIndex)
    ListBox1.Items.Add(dm.ChildRelationCount)
    End Sub
    private void Page_Load(object sender,System.EventArgs e)
    {
    System.Data.DataSet ds = new System.Data.DataSet();
    FarPoint.Web.Spread.Model.DefaultSheetDataModel dm;
    dm = new FarPoint.Web.Spread.Model.DefaultSheetDataModel();
    FpSpread1.ActiveSheetView.DataModel = dm;
    FpSpread1.HierarchicalView=true;
    DataTable emp = new DataTable("Employee");
    DataTable dept = new DataTable("Department");
    
    DataColumn lname = new DataColumn("LastName",typeof(String));
    DataColumn fname = new DataColumn("FirstName",typeof(String));
    
    DataColumn dname = new DataColumn("DeptName",typeof(String));
    DataColumn area = new DataColumn("Area",typeof(String));
    
    DataColumn id = emp.Columns.Add("ID",typeof(Int32));
    id.AutoIncrement=true;
    emp.PrimaryKey=new DataColumn[]{id};
    emp.Columns.Add(lname);
    emp.Columns.Add(fname);
    
    id=dept.Columns.Add("ID",typeof(Int32));
    id.AutoIncrement=true;
    dept.PrimaryKey=new DataColumn[]{id};
    id.AutoIncrement=true;
    DataColumnlang=dept.Columns.Add("Language",typeof(Int32));
    DataColumn[]foreignkey=new DataColumn[]{lang};
    dept.Columns.Add(dname);
    dept.Columns.Add(area);
    
    ds.Tables.Add(emp);
    ds.Tables.Add(dept);
    
    DataRow ti=emp.NewRow();
    ti[lname]="Bazemoreland";
    ti[fname]="Ti";
    emp.Rows.Add(ti);
    
    DataRow ginny=emp.NewRow();
    ginny[lname]="Danielson";
    ginny[fname]="Ginny";
    emp.Rows.Add(ginny);
    
    DataRow bob=emp.NewRow();
    bob[lname]="Morrison";
    bob[fname]="Bob";
    emp.Rows.Add(bob);
    
    DataRelation rel = new DataRelation("FarPoint",emp.PrimaryKey,foreignkey,false);
    ds.Relations.Add(rel);
    
    DataRow row=dept.NewRow();
    row["Language"]=ti["ID"];
    row[dname]="TechSupport";
    row[area]="C#";
    dept.Rows.Add(row);
    
    row=dept.NewRow();
    row["Language"]=ginny["ID"];
    row[dname]="TechSupport";
    row[area]="VB.Net";
    dept.Rows.Add(row);
    row=dept.NewRow();
    row["Language"]=bob["ID"];
    row[dname]="TechSupport";
    row[area]="C#";
    dept.Rows.Add(row);
    ds.AcceptChanges();
    dm.DataSource=ds;
    dm.DataMember="Employee";
    FarPoint.Web.Spread.Model.DefaultSheetDataModel dm2;
    dm2=(FarPoint.Web.Spread.Model.DefaultSheetDataModel)FpSpread1.Sheets[0].GetChildView(0,0).DataModel;
    ListBox1.Items.Add(dm2.ParentRelationName);
    ListBox1.Items.Add(Convert.ToString(dm2.ParentRowIndex));
    ListBox1.Items.Add(Convert.ToString(dm.ChildRelationCount));
    }
    See Also