在c#中从XLSX读取数据
本文关键字:读取 数据 XLSX 中从 | 更新日期: 2023-09-27 17:54:57
我是c#的新手,我试图用以下代码在c#中读取XLSX文件:
string Connection = "Provider=Microsoft.ACE.OLEDB.12.0;DataSource=c:''Temp''source.xlsx;Extended Properties='"Excel 12.0;HDR=Yes;IMEX=1'";";
//code to read the content of format file
OleDbConnection con = new OleDbConnection(Connection);
OleDbCommand command = new OleDbCommand();
DataTable dt = new DataTable();
OleDbDataAdapter myCommand = new OleDbDataAdapter("select * from [Tabelle1$]", con);
myCommand.Fill(dt);
Console.Write(dt.Rows.Count);
我从输出中得到一个正确的计数,但我还有两个问题:
1。如何使一个select where语句(如何访问行)?
select * from [Tabelle1$] where A = '123' (A being an existing Excel row)
将抛出错误,提及错误的参数…
2。谁能给我提供一个教程链接或简短的样本如何访问数据?
请参考以下示例代码:
private DataTable LoadXLS(string strFile, String sheetName, String column, String value)
{
DataTable dtXLS = new DataTable(sheetName);
try
{
string strConnectionString = "";
if(strFile.Trim().EndsWith(".xlsx")) {
strConnectionString = string.Format("Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties='"Excel 12.0 Xml;HDR=YES;IMEX=1'";", strFile);
} else if(strFile.Trim().EndsWith(".xls")) {
strConnectionString = string.Format("Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0};Extended Properties='"Excel 8.0;HDR=Yes;IMEX=1'";", strFile);
}
OleDbConnection SQLConn = new OleDbConnection(strConnectionString);
SQLConn.Open();
OleDbDataAdapter SQLAdapter = new OleDbDataAdapter();
string sql = "SELECT * FROM [" + sheetName + "$] WHERE " + column + " = " + value;
OleDbCommand selectCMD = new OleDbCommand(sql, SQLConn);
SQLAdapter.SelectCommand = selectCMD;
SQLAdapter.Fill(dtXLS);
SQLConn.Close();
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
return dtXLS;
}
我知道这是一个很好的答案的老问题,但是这个页面在谷歌的"导入xlsx c#"的结果中排名很高,所以我想添加一个更现代和更简单的方法来使用NPOI库读取xls/xlsx数据。我想确保新的c#开发人员知道,有一种更简单的方法来导入Excel数据,而不是使用ado.net。
我使用NPOI和NPOI的组合。Mapper(来自donnytian: https://github.com/donnytian/Npoi.Mapper)可以轻松导入Excel文件。添加NPOI和NPOI的核引用。Mapper,然后您可以使用强类型类导入xls/xlsx数据,这些强类型类直接与您想要导入的列相关。
' ' '使用先;使用来;使用Npoi.Mapper;使用Npoi.Mapper.Attributes;使用NPOI.SS.UserModel;使用UserManagementService.Models;
JobCustomerImport名称空间。处理器{公共类ExcelEmailProcessor{private UserManagementServiceContext DataContext {get;}
public ExcelEmailProcessor(int customerNumber)
{
DataContext = new UserManagementServiceContext();
}
public void Execute(string localPath, int sheetIndex)
{
IWorkbook workbook;
using (FileStream file = new FileStream(localPath, FileMode.Open, FileAccess.Read))
{
workbook = WorkbookFactory.Create(file);
}
var importer = new Mapper(workbook);
var items = importer.Take<MurphyExcelFormat>(sheetIndex);
foreach(var item in items)
{
var row = item.Value;
if (string.IsNullOrEmpty(row.EmailAddress))
continue;
UpdateUser(row);
}
DataContext.SaveChanges();
}
private void UpdateUser(MurphyExcelFormat row)
{
//LOGIC HERE TO UPDATE A USER IN DATABASE...
}
private class MurphyExcelFormat
{
[Column("District")]
public int District { get; set; }
[Column("DM")]
public string FullName { get; set; }
[Column("Email Address")]
public string EmailAddress { get; set; }
[Column(3)]
public string Username { get; set; }
public string FirstName
{
get
{
return Username.Split('.')[0];
}
}
public string LastName
{
get
{
return Username.Split('.')[1];
}
}
}
}
}' ' '
如果你感兴趣的话,我已经在我的博客上介绍了一些细节:如何轻松导入excel文件。
谢谢!丹