/// <summary>
/// 计算均分
/// </summary>
/// <param name="dgv">数据视图</param>
/// <param name="tb_Output">结果文本框</param>
public static void CalcGPA(DataGridView dgv, TextBox tb_Output)
{
dgv.EndEdit();
double avg = 0; //均分
double total_credit = 0; //学分
foreach (DataGridViewRow row in dgv.Rows)
{
if (!row.IsNewRow)
{
double cur_credit = (double)row.Cells[1].Value;
double cur_grade = (double)row.Cells[2].Value;
total_credit += cur_credit;
avg += cur_credit * cur_grade;
}
}
avg = avg / total_credit;
if (tb_Output.Text != null)
{
tb_Output.Text += "均分：" +
Math.Round(avg, 2).ToString() + Environment.NewLine;
tb_Output.Text += "GPA：" + GPA_CALC.Convert2GPA(avg) +
Environment.NewLine;
}
}
public static void ImportExcel2DGV(DataGridView dgv)
{
OpenFileDialog ofd = new OpenFileDialog();
ofd.Title = "选择待导入的数据文件";
ofd.Filter = "Excel Workbook 97-2003|*.xls|Excel Workbook|*.xlsx";
string filePath;
if (ofd.ShowDialog() == DialogResult.OK)
{
filePath = Path.GetFullPath(ofd.FileName);
FileStream fs;
try
{
fs = new FileStream(filePath, FileMode.Open, FileAccess.Read);
NPOI.HSSF.UserModel.HSSFWorkbook book =
new NPOI.HSSF.UserModel.HSSFWorkbook(fs);
int sheetCount = book.NumberOfSheets;
for (int index = 0; index < sheetCount; index++)
{
NPOI.SS.UserModel.ISheet sheet = book.GetSheetAt(index);
if (sheet == null)
{
continue;
}
NPOI.SS.UserModel.IRow row = sheet.GetRow(0);
if (row == null)
{
continue;
}
int firstCellNum = row.FirstCellNum;
int lastCellNum = row.LastCellNum;
if (firstCellNum == lastCellNum || lastCellNum - firstCellNum < 2)
{
continue;
}
//MainForm.dataBindings.Clear(); //清空表中数据
//确定第一行是否是数据行
int count = 0; //记录表中数据字段的总数
int start_row = 0;
for (int i = firstCellNum; i < lastCellNum; i++)
{
//if(row.GetCell(i) != null)
//{
//row.GetCell(i).SetCellType(NPOI.SS.UserModel.CellType.String);
if (GPA_CALC.isNum(row.GetCell(i).StringCellValue))
{
count++;
}
//}
}
if (count == 0)
{
start_row = 1;
}
for (int i = start_row; i <= sheet.LastRowNum; i++)
{
string courseName = sheet.GetRow(i).Cells[0].StringCellValue;
//MessageBox.Show(sheet.GetRow(i).Cells.Count.ToString());
double credit;
double grade;
try
{
sheet.GetRow(i).Cells[1].SetCellType(NPOI.SS.UserModel.CellType.String);
sheet.GetRow(i).Cells[2].SetCellType(NPOI.SS.UserModel.CellType.String);
credit = Convert.ToDouble(sheet.GetRow(i).Cells[1].StringCellValue);
grade = Convert.ToDouble(sheet.GetRow(i).Cells[2].StringCellValue);
}
catch (Exception e)
{
MessageBox.Show(e.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
credit = 0;
grade = 0;
}
//MessageBox.Show(sheet.LastRowNum.ToString());
InfoVo info = new InfoVo()
{
CourseName = courseName, Credit = credit, Grade = grade
};
//原创的处理InvalidOperationException的方法，当选中新行时会触发使得dataBinding添加异常的一行
if (dgv.CurrentRow != null && dgv.CurrentRow.IsNewRow)//别缺少前面的条件了，否则NRE
{
MainForm.dataBindings.RemoveAt(MainForm.dataBindings.Count - 1);
}
//dgv.ClearSelection();
MainForm.dataBindings.Add(info);
}
}
fs.Close();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
}