Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    If IsPostBack Then
        Return
    End If
    
    Dim sheet As FarPoint.Web.Spread.SheetView = FpSpread1.Sheets(0)
    
    FarPoint.Web.Spread.FilterColumnDefinition
    '非表示フィルタの作成
    Dim hf As New FarPoint.Web.Spread.HideRowFilter(sheet)
    'カスタムフィルタを作成
    Dim mc As New MyCustomFilter()
    'シートの設定
    mc.SheetView = sheet

    ' 1列目〜3列目にカスタムフィルタを設定
    For i As Integer = 0 To 2
        Dim fcd As  New FarPoint.Web.Spread.FilterColumnDefinition(i, FarPoint.Web.Spread.FilterListBehavior.Custom)
        'カスタムフィルタを定義に追加
        fcd.Filters.Add(mc)
        'フィルタ定義を非表示フィルタに追加
        hf.AddColumn(fcd)
    Next
    
    'フィルタをシートに設定 
    sheet.RowFilter = hf
End Sub

<Serializable()> _
Public Class MyCustomFilter
    Inherits FarPoint.Web.Spread.DefaultFilterItem
    Private sv As FarPoint.Web.Spread.SheetView = Nothing

    Public Sub New()
    End Sub
    Public Overloads Overrides ReadOnly Property DisplayName() As String
        Get
            Return "1000〜5000"
        End Get
    End Property
    'フィルタに表示する文字列
    Public Overloads Overrides WriteOnly Property SheetView() As FarPoint.Web.Spread.SheetView
        Set(ByVal value As FarPoint.Web.Spread.SheetView)
            sv = value
        End Set
    End Property
    Private Function IsNumeric(ByVal ovalue As Object) As Boolean
        Dim _isNumber As New System.Text.RegularExpressions.Regex("^\-?\d+\.?\d*$")
        Dim m As System.Text.RegularExpressions.Match = _isNumber.Match(Convert.ToString(ovalue))
        Return m.Success
    End Function
    Public Function IsFilteredIn(ByVal ovalue As Object) As Boolean
        Dim ret As Boolean = False
        If IsNumeric(ovalue) Then
            If Double.Parse(Convert.ToString(ovalue)) >= 1000 AndAlso Double.Parse(Convert.ToString(ovalue)) <= 5000 Then
                ret = True
            End If
        End If
        Return ret
    End Function
    Public Overloads Overrides Function Filter(ByVal columnIndex As Integer) As Integer()
        Dim ar As New System.Collections.ArrayList()
        Dim val As Object
        For i As Integer = 0 To sv.RowCount - 1
            val = sv.GetValue(i, columnIndex)
            If IsFilteredIn(val) Then
                ar.Add(i)
                '条件に合致する行番号をリストに追加
            End If
        Next
        Return DirectCast((ar.ToArray(GetType(Int32))), Int32())
    End Function
    Public Overloads Overrides Function ShowInDropDown(ByVal columnIndex As Integer, _
                                                       ByVal filteredInRowList As Integer()) As Boolean
        ' filteredInRowList引数は現在、フィルター・イン（フィルターの条件に合致した）行リスト
        ' 条件に合うデータが存在する時のみフィルター要素を表示します。
        If filteredInRowList Is Nothing Then
            For i As Integer = 0 To sv.RowCount - 1
                Dim value As Object = sv.GetValue(i, columnIndex)
                If value IsNot Nothing Then
                    If IsFilteredIn(value) Then
                        Return True
                    End If
                End If
            Next
        Else
            ' 現在の行リストが条件に合致するか確認
            For i As Integer = 0 To filteredInRowList.Length - 1
                Dim row As Integer = filteredInRowList(i)
                Dim value As Object = sv.GetValue(row, columnIndex)
                If value IsNot Nothing Then
                    If IsFilteredIn(value) Then
                        Return True
                    End If
                End If
            Next
        End If
        Return False
    End Function
    Public Overloads Overrides Function Serialize(ByVal w As System.Xml.XmlTextWriter) As Boolean
        w.WriteStartElement("MyCustomFilter")
        MyBase.Serialize(w)
        w.WriteEndElement()
        Return True
    End Function
    Public Overloads Overrides Function Deserialize(ByVal r As System.Xml.XmlNodeReader) As Boolean
        If r.NodeType = System.Xml.XmlNodeType.Element Then
            If r.Name.Equals("MyCustomFilter") Then
                MyBase.Deserialize(r)
            End If
        End If
        Return True
    End Function
End Class