C# excel文件导入导出
2024-08-28 05:04:28
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在C#交流群里，看到很多小伙伴在excel数据导入导出到C#界面上存在疑惑，所以今天专门做了这个主题，希望大家有所收获！
环境：win10+vs2017
界面：主要以演示为主，所以没有做优化，然后主界面上添加两个按钮，分别命名为ExportExcel和ImportExcel，添加两个dataGridView，分别是dataGridView1和dataGridView2
然后在窗体加载程序中给dataGridView1写入三行数据，代码如下：
DataTable dt = new DataTable();
dt.Columns.Add("Name");
dt.Columns.Add("Age");
dt.Rows.Add("小王","15");
dt.Rows.Add("老李","42");
dt.Rows.Add("老张","25");
dataGridView1.DataSource = dt;
软件运行后，点击ExportExcel，则将datagridview1的数据保存到excel中，点击ImportExcel，选择excel后读取数据到datagridview2.
注意：如果报System.InvalidOperationException:“未在本地计算机上注册“Microsoft.ACE.OLEDB.12.0”提供程序。”请检查office是否正确安装
具体步骤：
step1：引用dll，在nuget上安装Microsoft.Office.Interop.Excel
step2:code
主要由三个方法：
public void ExportExcel() 实现数据导出到excel
public DataSet ImportExcel(int t = 1）实现读取excel数据
public void ExportCSV() 数据导出到csv
完整代码如下：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms; using System.IO;
using System.Data.SqlClient;
using Excel = Microsoft.Office.Interop.Excel;
using System.Reflection;
using System.Xml;
using System.Data.OleDb; namespace excelReadWriter
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
} #region /* 数据导出到excel */
public void ExportExcel()
{
try
{
this.Cursor = Cursors.WaitCursor; if (!Directory.Exists(@"C:\BMDT"))
Directory.CreateDirectory(@"C:\BMDT"); string fileName = "";
string saveFileName = "";
SaveFileDialog saveDialog = new SaveFileDialog();
saveDialog.DefaultExt = "xlsx";
saveDialog.InitialDirectory = @"C:\BMDT";
saveDialog.Filter = "Excel文件|*.xlsx";
// saveDialog.FileName = fileName;
saveDialog.FileName = "BMDT_Data_" + DateTime.Now.ToLongDateString().ToString();
saveDialog.ShowDialog();
saveFileName = saveDialog.FileName; if (saveFileName.IndexOf(":") < 0)
{
this.Cursor = Cursors.Default;
return; //被点了取消
}
Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application();
if (xlApp == null)
{
MessageBox.Show("无法创建Excel对象，您的电脑可能未安装Excel");
return;
}
Microsoft.Office.Interop.Excel.Workbooks workbooks = xlApp.Workbooks;
Microsoft.Office.Interop.Excel.Workbook workbook = workbooks.Add(Microsoft.Office.Interop.Excel.XlWBATemplate.xlWBATWorksheet);
Microsoft.Office.Interop.Excel.Worksheet worksheet = (Microsoft.Office.Interop.Excel.Worksheet)workbook.Worksheets[1];//取得sheet1
Microsoft.Office.Interop.Excel.Range range = worksheet.Range[worksheet.Cells[4, 1], worksheet.Cells[8, 1]]; //写入标题
for (int i = 0; i < dataGridView1.ColumnCount; i++)
{ worksheet.Cells[1, i + 1] = dataGridView1.Columns[i].HeaderText; }
//写入数值
for (int r = 0; r < dataGridView1.Rows.Count; r++)
{
for (int i = 0; i < dataGridView1.ColumnCount; i++)
{
worksheet.Cells[r + 2, i + 1] = dataGridView1.Rows[r].Cells[i].Value; if (this.dataGridView1.Rows[r].Cells[i].Style.BackColor == Color.Red)
{ range = worksheet.Range[worksheet.Cells[r + 2, i + 1], worksheet.Cells[r + 2, i + 1]];
range.Interior.ColorIndex = 10; } }
System.Windows.Forms.Application.DoEvents();
}
worksheet.Columns.EntireColumn.AutoFit();//列宽自适应 MessageBox.Show(fileName + "资料保存成功", "提示", MessageBoxButtons.OK);
if (saveFileName != "")
{
try
{
workbook.Saved = true;
workbook.SaveCopyAs(saveFileName); //fileSaved = true; }
catch (Exception ex)
{//fileSaved = false;
MessageBox.Show("导出文件时出错,文件可能正被打开！\n" + ex.Message);
}
}
xlApp.Quit();
GC.Collect();//强行销毁 this.Cursor = Cursors.Default;
}
catch(Exception e)
{
this.Cursor = Cursors.Default;
MessageBox.Show(e.ToString()); } } #endregion
#region /* ImportExcel(int t) */ public DataSet ImportExcel(int t = 1)
{
//打开文件
string sql_select = string.Empty; OpenFileDialog file = new OpenFileDialog();
file.Filter = "Excel(*.xlsx)|*.xlsx|Excel(*.xls)|*.xls|(*.csv)|*.csv";
file.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
file.Multiselect = false;
if (file.ShowDialog() == DialogResult.Cancel)
return null;
//判断文件后缀
var path = file.FileName;
string fileSuffix = System.IO.Path.GetExtension(path);
if (string.IsNullOrEmpty(fileSuffix))
return null;
using (DataSet ds = new DataSet())
{
//判断Excel文件是2003版本还是2007版本
string connString = "";
if (fileSuffix == ".xls")
connString = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + path + ";" + ";Extended Properties=\"Excel 8.0;HDR=YES;IMEX=1\"";
else
connString = "Provider=Microsoft.ACE.OLEDB.12.0;" + "Data Source=" + path + ";" + ";Extended Properties=\"Excel 12.0;HDR=YES;IMEX=1\"";
//读取文件 if (t == 1)
sql_select = " SELECT ID,CREATETIME,REASONCODE1,PROCESSID FROM [Sheet1$] ";
else if (t == 2)
sql_select = " SELECT PANELID,EVENTTIME,DESCRIPTION,PROCESSID FROM [Grid$] ";
else if (t == 3)
sql_select = " SELECT Operation,Lot_ID,EQP_ID,Event_Time FROM [报表1$] "; using (OleDbConnection conn = new OleDbConnection(connString))
using (OleDbDataAdapter cmd = new OleDbDataAdapter(sql_select, conn))
{
conn.Open();
cmd.Fill(ds);
}
if (ds == null || ds.Tables.Count <= 0) return null;
return ds;
}
}
#endregion private void button1_Click(object sender, EventArgs e)
{
ExportExcel();
} private void Form1_Load(object sender, EventArgs e)
{
DataTable dt = new DataTable();
dt.Columns.Add("Name");
dt.Columns.Add("Age");
dt.Rows.Add("小王","15");
dt.Rows.Add("老李","42");
dt.Rows.Add("老张","25");
dataGridView1.DataSource = dt;
} private void button2_Click(object sender, EventArgs e)
{
DataSet ds = new DataSet();
ds = ImportExcel();
dataGridView2.DataSource = ds.Tables[0]; // ExportCSV();
} #region /* 数据导出到CSV */
public void ExportCSV()
{
if (dataGridView1.Rows.Count == 0)
{
MessageBox.Show("没有数据可导出!", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
return;
}
SaveFileDialog saveFileDialog = new SaveFileDialog();
saveFileDialog.Filter = "CSV files (*.csv)|*.csv";
saveFileDialog.FilterIndex = 0;
saveFileDialog.RestoreDirectory = true;
saveFileDialog.CreatePrompt = true;
saveFileDialog.FileName = null;
saveFileDialog.Title = "保存";
if (saveFileDialog.ShowDialog() == DialogResult.OK)
{
Stream stream = saveFileDialog.OpenFile();
StreamWriter sw = new StreamWriter(stream, System.Text.Encoding.GetEncoding(-0));
string strLine = "";
try
{
for (int i = 0; i < dataGridView1.ColumnCount; i++)
{
if (i > 0)
strLine += ","; strLine += dataGridView1.Columns[i].HeaderText; } strLine.Remove(strLine.Length - 1); sw.WriteLine(strLine); strLine = ""; //表的内容 for (int j = 0; j < dataGridView1.Rows.Count; j++)
{ strLine = ""; int colCount = dataGridView1.Columns.Count; for (int k = 0; k < colCount; k++)
{ if (k > 0 && k < colCount) strLine += ","; if (dataGridView1.Rows[j].Cells[k].Value == null) strLine += ""; else
{ string cell = dataGridView1.Rows[j].Cells[k].Value.ToString().Trim(); //防止里面含有特殊符号 cell = cell.Replace("\"", "\"\""); cell = "\"" + cell + "\""; strLine += cell; } } sw.WriteLine(strLine); } sw.Close(); stream.Close(); MessageBox.Show("数据被导出到：" + saveFileDialog.FileName.ToString(), "导出完毕", MessageBoxButtons.OK, MessageBoxIcon.Information); } catch (Exception ex)
{
MessageBox.Show(ex.Message, "导出错误", MessageBoxButtons.OK, MessageBoxIcon.Information); }
}
}
#endregion
}
}运行效果：
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