C# Winform 选择Excel文件并读取内容
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.OleDb;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace ReadExcel
{
public partial class FrmReadExcel : Form
{
public FrmReadExcel()
{
InitializeComponent();
}
#region UI控制
private void picBack_MouseLeave(object sender, EventArgs e)
{
picBack.BackColor = Color.FromArgb(25, 118, 210);
}
private void picBack_MouseMove(object sender, MouseEventArgs e)
{
picBack.BackColor = Color.FromArgb(237, 156, 40);
}
private void btnSelect_MouseLeave(object sender, EventArgs e)
{
btnSelect.BackColor = Color.FromArgb(25, 118, 210);
}
private void btnSelect_MouseMove(object sender, MouseEventArgs e)
{
btnSelect.BackColor = Color.FromArgb(237, 156, 40);
}
private void btnRead_MouseLeave(object sender, EventArgs e)
{
btnRead.BackColor = Color.FromArgb(25, 118, 210);
}
private void btnRead_MouseMove(object sender, MouseEventArgs e)
{
btnRead.BackColor = Color.FromArgb(237, 156, 40);
}
#endregion
#region 关闭程序
private void picBack_Click(object sender, EventArgs e)
{
System.Environment.Exit(0);
}
#endregion
#region 选择Excel文件
private void btnSelect_Click(object sender, EventArgs e)
{
openFileDialog1.Filter = "*.xls(Excel文件)|*.xls|*.xlsx(Excel文件)|*.xlsx";
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
textBox1.Text = openFileDialog1.FileName;
GetExcelTableNames(textBox1.Text);
dataGridView1.DataSource = null;
}
}
public DataTable GetExcelTableNames(string strExcelPath)
{
try
{
DataTable dtExcel = new DataTable();
//数据表
DataSet ds = new DataSet();
//获取文件扩展名
string strExtension = System.IO.Path.GetExtension(strExcelPath);
string strFileName = System.IO.Path.GetFileName(strExcelPath);
//Excel的连接
OleDbConnection objConn = null;
switch (strExtension)
{
case ".xls":
objConn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + strExcelPath + ";" + "Extended Properties=\"Excel 8.0;HDR=yes;IMEX=1;\"");
break;
case ".xlsx":
objConn = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + strExcelPath + ";" + "Extended Properties=\"Excel 12.0;HDR=yes;IMEX=1;\"");//此连接可以操作.xls与.xlsx文件 (支持Excel2003 和 Excel2007 的连接字符串) 备注： "HDR=yes;"是说Excel文件的第一行是列名而不是数，"HDR=No;"正好与前面的相反。"IMEX=1 "如果列中的数据类型不一致，使用"IMEX=1"可必免数据类型冲突。
break;
default:
objConn = null;
break;
}
if (objConn == null)
{
return null;
}
objConn.Open();
//获取Excel中所有Sheet表的信息
System.Data.DataTable schemaTable = objConn.GetOleDbSchemaTable(System.Data.OleDb.OleDbSchemaGuid.Tables, null);
//string lstSheetNames;
List lstSheetNames = new List();
comboBox1.Items.Clear();
for (int i = 0; i < schemaTable.Rows.Count; i++)
{
string strSheetName = (string)schemaTable.Rows[i]["TABLE_NAME"];
if (strSheetName.Contains("$") && !strSheetName.Replace("'", "").EndsWith("$"))
{
//过滤无效SheetName完毕....
continue;
}
if (lstSheetNames != null && !lstSheetNames.Contains(strSheetName))
strSheetName = strSheetName.Replace("$", "").Replace("'", "");
comboBox1.Items.Add(strSheetName);
lstSheetNames.Add(strSheetName);
}
objConn.Close();
comboBox1.SelectedIndex = 0;
return dtExcel;
}
catch (Exception ex)
{
MessageBox.Show(ex.Message + "\r\n" + ex.StackTrace);
return null;
}
}
#endregion
#region 读取数据
private void btnRead_Click(object sender, EventArgs e)
{
string excelFilePath = textBox1.Text;
string excelSheetName = comboBox1.Text;
excelSheetName = excelSheetName.Replace("$", "");
DataTable tb = GetExcelTableByOleDB(excelFilePath, excelSheetName);
dataGridView1.ClearSelection();
dataGridView1.AllowUserToAddRows = false;
dataGridView1.AllowUserToDeleteRows = false;
dataGridView1.ReadOnly = true;
dataGridView1.ColumnHeadersHeightSizeMode = DataGridViewColumnHeadersHeightSizeMode.EnableResizing;
dataGridView1.ColumnHeadersHeight = 30;
dataGridView1.RowTemplate.Height = 35;
dataGridView1.DataSource = tb;
}
public static DataTable GetExcelTableByOleDB(string strExcelPath, string tableName)
{
try
{
DataTable dtExcel = new DataTable();
//数据表
DataSet ds = new DataSet();
//获取文件扩展名
string strExtension = System.IO.Path.GetExtension(strExcelPath);
string strFileName = System.IO.Path.GetFileName(strExcelPath);
//Excel的连接
OleDbConnection objConn = null;
switch (strExtension)
{
case ".xls":
objConn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + strExcelPath + ";" + "Extended Properties=\"Excel 8.0;HDR=yes;IMEX=1;\"");
break;
case ".xlsx":
objConn = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + strExcelPath + ";" + "Extended Properties=\"Excel 12.0;HDR=yes;IMEX=1;\"");//此连接可以操作.xls与.xlsx文件 (支持Excel2003 和 Excel2007 的连接字符串) 备注： "HDR=yes;"是说Excel文件的第一行是列名而不是数，"HDR=No;"正好与前面的相反。"IMEX=1 "如果列中的数据类型不一致，使用"IMEX=1"可必免数据类型冲突。
break;
default:
objConn = null;
break;
}
if (objConn == null)
{
return null;
}
objConn.Open();
//获取Excel中所有Sheet表的信息
System.Data.DataTable schemaTable = objConn.GetOleDbSchemaTable(System.Data.OleDb.OleDbSchemaGuid.Tables, null);
//获取Excel的第一个Sheet表名
string tableName1 = schemaTable.Rows[0][2].ToString().Trim();
//string lstSheetNames;
List lstSheetNames = new List();
for (int i = 0; i < schemaTable.Rows.Count; i++)
{
string strSheetName = (string)schemaTable.Rows[i]["TABLE_NAME"];
if (strSheetName.Contains("$") && !strSheetName.Replace("'", "").EndsWith("$"))
{
//过滤无效SheetName完毕....
continue;
}
if (lstSheetNames != null && !lstSheetNames.Contains(strSheetName))
//MessageBox.Show(strSheetName);
lstSheetNames.Add(strSheetName);
}
// MessageBox.Show(lstSheetNames[0]);
string strSql = "select * from [" + tableName + "$]";
// string strSql = "select 分院名称,城区,地址 from [" + tableName + "$]";
//获取Excel指定Sheet表中的信息
OleDbCommand objCmd = new OleDbCommand(strSql, objConn);
OleDbDataAdapter myData = new OleDbDataAdapter(strSql, objConn);
myData.Fill(ds, tableName);//填充数据
objConn.Close();
//dtExcel即为excel文件中指定表中存储的信息
dtExcel = ds.Tables[tableName];
return dtExcel;
}
catch (Exception ex)
{
MessageBox.Show(ex.Message + "\r\n" + ex.StackTrace);
return null;
}
}
#endregion
}
}
备注:如果程序提示未在本地计算机上注册“microsoft.ACE.oledb.12.0”!!!
解决办法：
1、下载对应组件安装：https://www.microsoft.com/zh-CN/download/details.aspx?id=13255
注意：要选择AccessDatabaseEngine.exe，而不是AccessDatabaseEngine64.exe，否则还会提示错误！！！