使用C#和Excel进行报表开发（三）－生成统计图（Chart）4

private void button4_Click(object sender, EventArgs e)
{
    try
    {
        ThisApplication = new Excel.Application();
        m_objBooks = (Excel.Workbooks)ThisApplication.Workbooks;
        ThisWorkbook = (Excel._Workbook)(m_objBooks.Add(Type.Missing));

        ThisApplication.DisplayAlerts = false;

        this.DeleteSheet();
        this.AddDatasheet();
        this.LoadData();

        CreateChart();

        ThisWorkbook.SaveAs("z:\\Book2.xls", Type.Missing, Type.Missing,
                    Type.Missing, Type.Missing, Type.Missing, Excel.XlSaveAsAccessMode.xlNoChange,
                Type.Missing, Type.Missing, Type.Missing, Type.Missing);

    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
    finally
    {
        ThisWorkbook.Close(Type.Missing, Type.Missing, Type.Missing);
        ThisApplication.Workbooks.Close();

        ThisApplication.Quit();
                System.Runtime.InteropServices.Marshal.ReleaseComObject(ThisWorkbook);
                System.Runtime.InteropServices.Marshal.ReleaseComObject(ThisApplication);
        ThisWorkbook = null;
        ThisApplication = null;
        GC.Collect();
        this.Close();
    }

}

Excel.Application ThisApplication = null;
Excel.Workbooks m_objBooks = null;
Excel._Workbook ThisWorkbook = null;

Excel.Worksheet xlSheet = null;

/**//// <summary>
/// 用生成的随机数作数据
/// </summary>
private void LoadData()
{
    Random ran = new Random();
    for (int i = 1; i <= 12; i++)
    {
        xlSheet.Cells[i,  1] = i.ToString() + "月";
        xlSheet.Cells[i, 2] = ran.Next(2000).ToString();    
    }
}
/**//// <summary>
/// 删除多余的Sheet
/// </summary>
private void DeleteSheet()
{
    foreach (Excel.Worksheet ws in ThisWorkbook.Worksheets)
        if (ws != ThisApplication.ActiveSheet)
        {
            ws.Delete();
        }
    foreach (Excel.Chart cht in ThisWorkbook.Charts)
        cht.Delete();
            
}
/**//// <summary>
/// 创建一个Sheet，用来存数据
/// </summary>
private void AddDatasheet()
{
    xlSheet = (Excel.Worksheet)ThisWorkbook.
        Worksheets.Add(Type.Missing, ThisWorkbook.ActiveSheet,
        Type.Missing, Type.Missing);

    xlSheet.Name = "数据";
}