入出金履歴の作成

サマリ型セル（SummaryCell）で預金通帳のように入金と出金の履歴に基づく残高を計算するには、ICalculationインタフェースを実装する独自の計算オブジェクトを作成する必要があります。

CustomCalculationクラスのコード

次のコードは、直前の行の残高と入金された値と出金された値の合計を返します。直前の行がない場合（つまり最初の行の場合）は残高を0で処理します。

Visual Basic
C#

Imports GrapeCity.Win.MultiRow

Public Class CustomCalculation
    Implements ICalculation

    Private _balanceCellName As String
    Private _creditsCellName As String
    Private _chargesCellName As String

    Public Function Calculate(ByVal context As GrapeCity.Win.MultiRow.CalculationContext) As Object Implements GrapeCity.Win.MultiRow.ICalculation.Calculate
        If String.IsNullOrEmpty(Me._creditsCellName) Then Return 0
        If String.IsNullOrEmpty(Me._chargesCellName) Then Return 0

        If context.Scope = CellScope.Row Then
            Dim balance As Decimal = 0
            Dim credits As Decimal = 0
            Dim charges As Decimal = 0

            If Not context.SectionIndex = 0 Then
                Dim balanceCellValue As Object = context.GcMultiRow.GetValue(context.SectionIndex - 1, Me._balanceCellName)
                balance = DirectCast(balanceCellValue, Decimal)
            End If

            Dim creditseCellValue As Object = context.GcMultiRow.GetValue(context.SectionIndex, Me._creditsCellName)
            If creditseCellValue IsNot Nothing Then
                credits = DirectCast(creditseCellValue, Decimal)
            End If

            Dim chargesCellValue As Object = context.GcMultiRow.GetValue(context.SectionIndex, Me._chargesCellName)
            If chargesCellValue IsNot Nothing Then
                charges = DirectCast(chargesCellValue, Decimal)
            End If

            Return balance + charges - credits
        End If

        Return Nothing
    End Function

    ' 残高のセルを指定する
    Public Property BalanceCellName() As String
        Get
            Return _balanceCellName
        End Get
        Set(ByVal value As String)
            _balanceCellName = value
        End Set
    End Property

    ' 出金のセルを指定する
    Public Property CreditsCellName() As String
        Get
            Return _creditsCellName
        End Get
        Set(ByVal value As String)
            _creditsCellName = value
        End Set
    End Property

    ' 入金のセルを指定する
    Public Property ChargesCellName() As String
        Get
            Return _chargesCellName
        End Get
        Set(ByVal value As String)
            _chargesCellName = value
        End Set
    End Property

    Public Function Clone() As Object Implements System.ICloneable.Clone
        Dim _customCalculation As New CustomCalculation()
        _customCalculation.BalanceCellName = Me.BalanceCellName
        _customCalculation.CreditsCellName = Me.CreditsCellName
        _customCalculation.ChargesCellName = Me.ChargesCellName
        Return _customCalculation
    End Function
End Class

using GrapeCity.Win.MultiRow; 

public class CustomCalculation : ICalculation
{
    private string _balanceCellName;
    private string _creditsCellName;
    private string _chargesCellName;

    public object Calculate(CalculationContext context)
    {
        if (string.IsNullOrEmpty(this._creditsCellName)) return 0;
        if (string.IsNullOrEmpty(this._chargesCellName)) return 0;

        if (context.Scope == CellScope.Row)
        {
            decimal balance = 0;
            decimal credits = 0;
            decimal charges = 0;

            if (context.SectionIndex != 0)
            {
                object balanceCellValue = context.GcMultiRow.GetValue(context.SectionIndex - 1, this._balanceCellName);
                balance = (decimal)balanceCellValue;
            }

            object creditsCellValue = context.GcMultiRow.GetValue(context.SectionIndex, this._creditsCellName);
            if (creditsCellValue != null)
            {
                credits = (decimal)creditsCellValue;
            }

            object chargesCellValue = context.GcMultiRow.GetValue(context.SectionIndex, this._chargesCellName);
            if (chargesCellValue != null)
            {
                charges = (decimal)chargesCellValue;
            }

            return balance + charges - credits;
        }
        return null;
    }

    // 残高のセルを指定する
    public string BalanceCellName
    {
        get { return _balanceCellName; }
        set { _balanceCellName = value; }
    }

    // 出金のセルを指定する
    public string CreditsCellName
    {
        get { return _creditsCellName; }
        set { _creditsCellName = value; }
    }

    // 入金のセルを指定する
    public string ChargesCellName
    {
        get { return _chargesCellName; }
        set { _chargesCellName = value; }
    }

    public object Clone()
    {
        CustomCalculation _customCalculation = new CustomCalculation();
        _customCalculation.BalanceCellName = this.BalanceCellName;
        _customCalculation.CreditsCellName = this.CreditsCellName;
        _customCalculation.ChargesCellName = this.ChargesCellName;
        return _customCalculation;
    }
}

コーディングによる設定

Visual Basic
C#

Imports GrapeCity.Win.MultiRow

Dim charges As New NumericUpDownCell()
charges.Name = "入金"
Dim credits As New NumericUpDownCell()
credits.Name = "出金"
Dim balance As New SummaryCell()
balance.Name = "残高"
Dim custom As New CustomCalculation()
custom.BalanceCellName = "残高"
custom.ChargesCellName = "入金"
custom.CreditsCellName = "出金"
balance.Calculation = custom
balance.Style.TextAlign = MultiRowContentAlignment.MiddleRight

Dim Template1 = Template.CreateGridTemplate(New Cell() {charges, credits, balance})
Template1.ColumnHeaders(0).Cells(0).Value = "入金"
Template1.ColumnHeaders(0).Cells(1).Value = "出金"
Template1.ColumnHeaders(0).Cells(2).Value = "残高"
GcMultiRow1.Template = Template1

using GrapeCity.Win.MultiRow;

NumericUpDownCell charges = new NumericUpDownCell();
charges.Name = "入金";
NumericUpDownCell credits = new NumericUpDownCell();
credits.Name = "出金";
SummaryCell balance = new SummaryCell();
balance.Name = "残高";
CustomCalculation custom = new CustomCalculation();
custom.BalanceCellName = "残高";
custom.ChargesCellName = "入金";
custom.CreditsCellName = "出金";
balance.Calculation = custom;
balance.Style.TextAlign = MultiRowContentAlignment.MiddleRight;

Template template1 = Template.CreateGridTemplate(new Cell[] { charges, credits, balance });
template1.ColumnHeaders[0].Cells[0].Value = "入金";
template1.ColumnHeaders[0].Cells[1].Value = "出金";
template1.ColumnHeaders[0].Cells[2].Value = "残高";
gcMultiRow1.Template = template1;