C# winfrom datagridview 如何为一列添加向下滚动条 请看清楚再回答！

Posted 2023-04-28

我要的是如何将一个列显示数据多的话有垂直的滚动条！

参考技术A DataGridViewComboBoxColumn
dcombo
=
new
DataGridViewComboBoxColumn();
dcombo.Items.Add("暂存");
dcombo.Items.Add("留库");
dcombo.Items.Add("归还");
dcombo.Name
=
"combo";
//显示的位置列
dcombo.DisplayIndex
=
0;
dcombo.HeaderText
=
"入库方式";
//绑定数据库的值时使用以下属性
//dcombo.DataPropertyName
=
"danwei";
dataGridView1.Columns.Add(dcombo);
//dataGridView1.Columns.Add(dcombo);
你可以进行改动一下就能用了

winfrom_导入Excel文件加载数据到datagridview并将数据保存到数据库

1.效果图：

Excel表：

winfrom界面：

主要先 选择Excel文件--->显示文件路径--->选择是那一个Excel表--->加载显示在下面的datagridview--->导入到数据库保存

2.点击 ‘选择Excel’ 按钮事件：

 1  private void btn_excel_Click(object sender, EventArgs e)
 2         {
 3             try
 4             {
 5                 //获取Excel文件路径和名称  
 6                 OpenFileDialog odXls = new OpenFileDialog();
 7                 //指定相应的打开文档的目录  AppDomain.CurrentDomain.BaseDirectory定位到Debug目录，再根据实际情况进行目录调整  
 8                 string folderPath = AppDomain.CurrentDomain.BaseDirectory + @"databackup\\";
 9                 odXls.InitialDirectory = folderPath;
10                 // 设置文件格式    
11                 odXls.Filter = "Excel files office2003(*.xls)|*.xls|Excel office2010(*.xlsx)|*.xlsx";
12                 //openFileDialog1.Filter = "图片文件(*.jpg)|*.jpg|(*.JPEG)|*.jpeg|(*.PNG)|*.png";  
13                 odXls.FilterIndex = 1;
14                 odXls.RestoreDirectory = true;
15                 if (odXls.ShowDialog() == DialogResult.OK)
16                 {
17                     this.txtFilePath.Text = odXls.FileName;
18                     this.txtFilePath.ReadOnly = true;
19 
20                     string sConnString = string.Format("Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties=\\"Excel 12.0;HDR=Yes;\\"", odXls.FileName);
21                     if ((System.IO.Path.GetExtension(txtFilePath.Text.Trim())).ToLower() == ".xls")
22                     {
23                         sConnString = string.Format("Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0};Extended Properties=\\"Excel 8.0;HDR=Yes;IMEX=1;\\"", odXls.FileName);
24                     }
25                     using (OleDbConnection oleDbConn = new OleDbConnection(sConnString))
26                     {
27                         oleDbConn.Open();
28                         DataTable dt = oleDbConn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "TABLE" });
29                         //判断是否cmb中已有数据，有则清空  
30                         if (cmbtablename.Items.Count > 0)
31                         {
32                             cmbtablename.DataSource = null;
33                             cmbtablename.Items.Clear();
34                         }
35                         //遍历dt的rows得到所有的TABLE_NAME，并Add到cmb中  
36                         foreach (DataRow dr in dt.Rows)
37                         {
38                             cmbtablename.Items.Add((String)dr["TABLE_NAME"]);
39                         }
40                         if (cmbtablename.Items.Count > 0)
41                         {
42                             cmbtablename.SelectedIndex = 0;
43                         }
44                         //加载Excel文件数据按钮  
45                         this.btnSearch.Enabled = true;
46                     }
47                 }
48             }
49             catch (Exception ex)
50             {
51                 MessageBox.Show(ex.Message);
52             }
53         }

注：可能会报错 ‘未在本地计算机上注册“Microsoft.ACE.OLEDB.12.0”提供程序’，需要下载AccessDatabaseEngine.exe并安装；

     3.点击 ‘加载Excel’ 按钮事件

 1 private void btnSearch_Click(object sender, EventArgs e)
 2         {
 3             if (string.IsNullOrEmpty(txtFilePath.Text))
 4             {
 5                 MessageBox.Show("请选择Excel!");
 6             }
 7             else
 8             {//读取相应的表名的Excel文件中数据到当前DataGridview中显示 
 9                 string strConn = string.Format("Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties=\\"Excel 12.0;HDR=Yes;\\"", txtFilePath.Text.Trim());
10                 if ((System.IO.Path.GetExtension(txtFilePath.Text.Trim())).ToLower() == ".xls" && (System.IO.Path.GetExtension(txtFilePath.Text.Trim())).ToLower() == ".xlsx")
11                 {
12                     strConn = string.Format("Provider = Microsoft.Jet.OLEDB.4.0; Data Source = {0}; Extended Properties =\\"Excel 8.0;HDR=Yes;IMEX=1;\\"", txtFilePath.Text.Trim());
13                 }
14                 string sTableName = cmbtablename.Text.Trim();
15                 try
16                 {
17                     OleDbDataAdapter da = new OleDbDataAdapter("select *from [" + sTableName + "]", strConn);
18                     DataSet oldDS = new DataSet();
19                     da.Fill(oldDS);
20                     this.dgv_students.DataSource = oldDS.Tables[0];
21                 }
22                 catch (Exception ex)
23                 {
24                     MessageBox.Show(ex.Message);
25                 }
26             }
27         }      

4.点击‘确定导入’按钮事件

 1 private void btnSub_Click(object sender, EventArgs e)
 2         {
 3             if (txtFilePath.Text.Trim() != "" && cmbtablename.Text.Trim() != "")
 4             {
 5                 int nums = dgv_students.Rows.Count;
 6                 if (nums < 0) return;
 7 
 8                 string studentID, name, sex, phone, idNumber, address, deposit, tuitionPayable, seatNumber;
 9                 for (int i = 0; i < dgv_students.Rows.Count; i++)
10                 {
11                     studentID = this.dgv_students.Rows[i].Cells[0].Value.ToString();
12                     name = this.dgv_students.Rows[i].Cells[1].Value.ToString();
13                     sex = this.dgv_students.Rows[i].Cells[2].Value.ToString();
14                     phone = this.dgv_students.Rows[i].Cells[3].Value.ToString();
15                     idNumber = this.dgv_students.Rows[i].Cells[4].Value.ToString();
16                     address = this.dgv_students.Rows[i].Cells[5].Value.ToString();
17                     deposit = this.dgv_students.Rows[i].Cells[6].Value.ToString();
18                     tuitionPayable = this.dgv_students.Rows[i].Cells[7].Value.ToString();
19                     seatNumber = this.dgv_students.Rows[i].Cells[8].Value.ToString();        
20                     int result = dal.AddtoImport(studentID, name, sex, phone, idNumber, address, deposit, tuitionPayable, seatNumber);
21                     if (result == 0)
22                     {
23                         MessageBox.Show("数据导入成功！\\n");
24                     }
25                     else
26                     {
27                         MessageBox.Show("数据导入失败！ Error:" + result + "\\n");
28                     }
29                 }
30             }
31             else
32             {
33                 MessageBox.Show("请加载表格！");
34             }
35         }