Création d'un excel chartRésolu

Question

Bonjour, 
J'essaie de créer  un excel  pie3d  chart via le vb.net

Public Sub ShowChart(ByVal mylist As List(Of Classdayhag))
        Dim celltable As excel.Range
        Dim indexcol As Integer
        Dim indexrow As Integer
        Try

With xlworksheet
                celltable = .Range("A1", "B" & (mylist.Count - 1))
                indexcol = 1
                indexrow = 1
                For Each item As Classdayhag In mylist
                    .Cells(indexrow, indexcol) = item.dayname
                    .Cells(indexrow, indexcol + 1) = item.count
                    indexrow += 1
                Next
                celltable.Select()
                Dim mychart As New excel.Chart
                With mychart
                    .Shapes.AddChart.Select()
                    .ChartType = excel.XlChartType.xl3DPie
                    .SetSourceData(Source:=celltable)
                    .ApplyLayout(6)
                End With
            End With

objexcel.Visible = True
            RaiseEvent isshown()
            objexcel = Nothing
        Catch ex As Exception
            MessageBox.Show(ex.Message)
            objexcel = Nothing
        End Try
    End Sub


 j'obtiens l'erreur  à la ligne   .Shapes.AddChart.Select()
Unable to cast COM object of type 'Microsoft.Office.Interop.Excel.ChartClass' to interface type 'Microsoft.Office.Interop.Excel._Chart

merci d'avance

cs_ShayW · Answer

j'ai réussi

Public Sub ShowChart(ByVal mylist As List(Of Classdayhag), ByVal title As String)

'create chart

Dim xlCharts As excel.ChartObjects
        Dim myChart As excel.ChartObject
        Dim celltable As excel.Range
        Dim indexcol As Integer
        Dim indexrow As Integer

Try
            xlCharts = CType(xlworksheet.ChartObjects, excel.ChartObjects)
            myChart = xlCharts.Add(10, 80, 400, 400)
            With xlworksheet
                celltable = .Range("A1", "B" & (mylist.Count))

indexcol = 1
                indexrow = 1
                For Each item As Classdayhag In mylist
                    .Cells(indexrow, indexcol) = item.dayname
                    .Cells(indexrow, indexcol + 1) = item.count
                    indexrow += 1
                Next
                celltable.Select()

With myChart
                    .Chart.ChartType = excel.XlChartType.xl3DPie
                    .Chart.HasTitle = True
                    .Chart.ChartTitle.Text = title
                    .Chart.ChartTitle.Font.Name = "Arial"
                    .Chart.ChartTitle.Font.Size = 12
                    .Chart.ChartTitle.Font.Bold = True
                    .Chart.SetSourceData(Source:=celltable)
                    .Chart.ApplyLayout(6)
                
                End With
            End With

objexcel.Visible = True
            RaiseEvent isshown()
            objexcel = Nothing
        Catch ex As Exception
            MessageBox.Show(ex.Message)
            objexcel = Nothing
        End Try

End Sub

Création d'un excel chart

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