C# 使用dataGridView导入导出excel(NPOI)，可以通过关键字定位，删除空行等功能

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C# 使用dataGridView导入导出excel(NPOI)，可以通过关键字定位，删除空行等功能

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[j] = row.GetCell(j).ToString();
81                         }
82                     }
83                     daNpoi.Rows.Add(dr);
84                 }
85             }
86 
87             dataGridView1.DataSource = daNpoi;
88         }

2，导出数据（NPOI）

 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[i].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[i][j].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         }

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 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[row].Cells[col].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         }

4，获取excel的列标题，给ComboBox控件

 1  public 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[i].HeaderText;
10                // this.dataGridView2.Columns[i].HeaderText = this.dataGridView1.Columns[i].HeaderText;  //2的列名和1的一样
11               //  dataGridView2.Columns[i].MinimumWidth = dataGridView1.Columns[i].MinimumWidth;   //2的列宽和1 一样
12                 // = dataGridView1.Rows[0].Cells[i].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         }

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

 1  int 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[i][lie_ming_cb.Text].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[i].Selected = true;
21                         //让指定行处于选中状态（状态）
22                         dataGridView1.CurrentCell = dataGridView1.Rows[i].Cells[1];
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         }

6，textbox可以敲回车直接查找，需要添加textbox的KeyDown事件

 private void guanJianZi_box_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyValue == 13)
            {
                chaZhao_bt_1_Click(sender, e);
            }
        }

出处：https://www.cnblogs.com/qi-jiayou/p/16385092.html

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