C# 使用dataGridView导入导出excel(NPOI)，可以通过关键字定位，删除空行等
做下记录，首先插入一个dataGridView控件，两个button按钮（导入数据，导出数据），一个ComboBox(获取列标题使用)，一个textbox（输入关键字），一个定位按钮（定位使用）
1，导入数据（NPOI）
1
2 private void daoRuShuJu_cmd_Click(object sender, EventArgs e)
3 {
4 DataTable daNpoi = new DataTable();
5 string fileName = Application.StartupPath;
6 fileName += "\\4G模组表.xls";
7 string sheetName = "4G模组情况表";
8 bool isColumnName = true;
9 IWorkbook workbook;
10 string fileExt = Path.GetExtension(fileName).ToString();
11 using (FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read))
12 {
13 if (fileExt == ".xlsx")
14 {
15 workbook = new XSSFWorkbook(fs);
16 }
17 else if (fileExt == ".xls")
18 {
19 workbook = new HSSFWorkbook(fs);
20 }
21 else
22 {
23
24 workbook = null;
25 }
26
27 ISheet sheet = null;
28 if (sheetName != null && sheetName != "")
29 {
30 sheet = workbook.GetSheet(sheetName);
31 if (sheet == null)
32 {
33 sheet = workbook.GetSheetAt(0);
34 }
35
36 }
37 else
38 {
39 sheet = workbook.GetSheetAt(0);
40 }
41
42 IRow header = sheet.GetRow(sheet.FirstRowNum);
43 int startRow = 0;
44 if (isColumnName)
45 {
46 startRow = sheet.FirstRowNum + 1;
47 for (int i = header.FirstCellNum; i < header.LastCellNum; i++)
48 {
49 ICell cell = header.GetCell(i);
50 if (cell != null)
51 {
52 string cellValue = cell.ToString();
53 if (cellValue != null)
54 {
55 DataColumn col = new DataColumn(cellValue);
56 daNpoi.Columns.Add(col);
57 }
58 else
59 {
60 DataColumn col = new DataColumn();
61 daNpoi.Columns.Add(col);
62 }
63 }
64 }
65 }
66
67 for (int i = startRow; i <= sheet.LastRowNum; i++)
68 {
69 IRow row = sheet.GetRow(i);
70 if (row == null)
71 {
72 continue;
73 }
74 DataRow dr = daNpoi.NewRow();
75 for (int j = row.FirstCellNum; j < row.LastCellNum; j++)
76 {
77
78 if (row.GetCell(j) != null)
79 {
80 dr = row.GetCell(j).ToString();
81 }
82 }
83 daNpoi.Rows.Add(dr);
84 }
85 }
86
87 dataGridView1.DataSource = daNpoi;
88 }3，删除空行函数
// 删除空白行调用函数，在不需要用户添加新行或者数据的时候使用，ALLowUsertoAddRows 这个属性需要设置false
//如果ALLowUsertoAddRows 这个属性是true,则，用户可以输入数据，但是row < view.Rows.Count需要 -1不去判断最后一行
// 所以传入的x根据情况更改，想用户可以输入，ALLowUsertoAddRows的值为true, x=0;
//不想用户输入ALLowUsertoAddRows的值为false x=1;
1 private void baoCunShuJu_cmd_Click(object sender, EventArgs e)
2 {
3 DataTable dtTable = dataGridView1.DataSource as DataTable;
4 string sheetName = "4G模组情况表"; //sheet名字
5 IWorkbook wb = new HSSFWorkbook();
6 ISheet sheet = string.IsNullOrEmpty(sheetName) ? wb.CreateSheet("sheet1") : wb.CreateSheet(sheetName);
7 int rowIndex = 0;
8 if (dtTable.Columns.Count > 0)
9 {
10 IRow header = sheet.CreateRow(rowIndex);
11 for (int i = 0; i < dtTable.Columns.Count; i++)
12 {
13 ICell cell = header.CreateCell(i);
14 cell.SetCellValue(dtTable.Columns.ColumnName);
15 }
16 }
17 if (dtTable.Rows.Count > 0)
18 {
19 for (int i = 0; i < dtTable.Rows.Count; i++)
20 {
21 rowIndex++;
22 IRow row = sheet.CreateRow(rowIndex);
23 for (int j = 0; j < dtTable.Columns.Count; j++)
24 {
25 ICell cell = row.CreateCell(j);
26 cell.SetCellValue(dtTable.Rows.ToString());
27 }
28 }
29 }
30
31 for (int i = 0; i < dtTable.Columns.Count; i++)
32 {
33 sheet.AutoSizeColumn(i);
34 }
35
36 string fileName = Application.StartupPath; // debug 目录
37 fileName += "\\4G模组表.xls";//excel 名字
38 using (FileStream fs = new FileStream(fileName, FileMode.Create, FileAccess.Write))
39 {
40 wb.Write(fs);
41 }
42 MessageBox.Show("保存成功");
43 }4，获取excel的列标题，给ComboBox控件
1private void clearGrid(DataGridView view, int x)
2 {
3 for (int row = 0; row < (view.Rows.Count - x); ++row)
4 {
5 bool isEmpty = true;
6 for (int col = 0; col < view.Columns.Count; ++col)
7 {
8 object value = view.Rows.Cells.Value;
9 if (value != null && value.ToString().Length > 0)
10 {
11 isEmpty = false;
12 break;
13 }
14 }
15 if (isEmpty)
16 {
17 view.Rows.RemoveAt(row--);
18 }
19 }
20 }
5，定位，可以在每个列里根据关键字去查找，并且定位到行，可实现下一条功能
1public void huoQu_Column() //把excel表各列标题弄到combobox上
2 {
3 // int Rowcount = dataGridView1.RowCount;//获取datagridview的行数
4 int Columncount = dataGridView1.ColumnCount;//获取datagridview的列数
5 // dataGridView2.ColumnCount = Columncount;//新增列
6 // dataGridView2.ColumnHeadersVisible = true;//新增的列显示出来
7 for (int i = 0; i < Columncount; i++)
8 {
9 string var = this.dataGridView1.Columns.HeaderText;
10 // this.dataGridView2.Columns.HeaderText = this.dataGridView1.Columns.HeaderText;//2的列名和1的一样
11 //dataGridView2.Columns.MinimumWidth = dataGridView1.Columns.MinimumWidth; //2的列宽和1 一样
12 // = dataGridView1.Rows.Cells.Value.ToString();
13 lie_ming_cb.Items.Add(var);
14 //lie_ming_cb_1.Items.Add(var);
15 // if (var == "IMEI")
16 // {
17 // lie_ming_cb_1.SelectedIndex = i;
18 //}
19 }
20 lie_ming_cb.SelectedIndex = 0;
21 }6，textbox可以敲回车直接查找，需要添加textbox的KeyDown事件
1int xiayitiao_int = 0;//下一条标记
2
3 private void chaZhao_bt_1_Click(object sender, EventArgs e) //定位按钮
4 {
5 DataTable rentTable = (DataTable)dataGridView1.DataSource;//获取数据源
6 int r = 0;
7 bool dingwei_f;//定位标记，
8
9
10 if ((guanJianZi_box.Text != "") && (guanJianZi_box.Text != "/请输入关键字/"))
11 {
12 for (int i = xiayitiao_int; i < rentTable.Rows.Count; i++)
13 {
14 dingwei_f = rentTable.Rows.ToString().Contains(guanJianZi_box.Text); //对比字符串，
15
16 if (dingwei_f)
17 {
18 //指定行
19 dataGridView1.ClearSelection();
20 dataGridView1.Rows.Selected = true;
21 //让指定行处于选中状态（状态）
22 dataGridView1.CurrentCell = dataGridView1.Rows.Cells;
23 dataGridView1.CurrentRow.Selected = true;
24 dingwei_f = false;
25 xiayitiao_int = i+1; //下一条的标记
26 r++;
27 return;
28 }
29 }
30 if (r > 0)
31 {
32
33 }
34 else
35 {
36 MessageBox.Show("没有匹配项或已经是最后一条，将从第一条继续查找", "提示");
37 xiayitiao_int = 0; //重新查找
38 }
39 }
40 else
41 {
42 MessageBox.Show("请输入正确的关键字", "提示");
43 }
44 }
来源：https://www.cnblogs.com/qi-jiayou/archive/2022/06/17/16385092.html
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