我正在使用ExcelDataReader
从C#中的Excel工作簿中读取数据
但我的Excel工作表的结构使得要读取的数据可以从任何特定单元格开始,而不一定是A1
。
任何人都可以使用ExcelDataReader
建议如何实现这一目标吗?
答案 0 :(得分:33)
如果您使用的是ExcelDataReader 3+
,您会发现没有任何方法可以为您的读者对象设置AsDataSet()
,您还需要为ExcelDataReader.DataSet
安装另一个包,然后您就可以了使用AsDataSet()
方法
此外,IsFirstRowAsColumnNames
没有属性,您需要在ExcelDataSetConfiguration
内设置。
示例:
using (var stream = File.Open(originalFileName, FileMode.Open, FileAccess.Read))
{
IExcelDataReader reader;
// Create Reader - old until 3.4+
////var file = new FileInfo(originalFileName);
////if (file.Extension.Equals(".xls"))
//// reader = ExcelDataReader.ExcelReaderFactory.CreateBinaryReader(stream);
////else if (file.Extension.Equals(".xlsx"))
//// reader = ExcelDataReader.ExcelReaderFactory.CreateOpenXmlReader(stream);
////else
//// throw new Exception("Invalid FileName");
// Or in 3.4+ you can only call this:
reader = ExcelDataReader.ExcelReaderFactory.CreateReader(stream)
//// reader.IsFirstRowAsColumnNames
var conf = new ExcelDataSetConfiguration
{
ConfigureDataTable = _ => new ExcelDataTableConfiguration
{
UseHeaderRow = true
}
};
var dataSet = reader.AsDataSet(conf);
var dataTable = dataSet.Tables[0];
//...
}
您可以找到单元格引用的行号和列号,如下所示:
var cellStr = "AB2"; // var cellStr = "A1";
var match = Regex.Match(cellStr, @"(?<col>[A-Z]+)(?<row>\d+)");
var colStr = match.Groups["col"].ToString();
var col = colStr.Select((t, i) => (colStr[i] - 64) * Math.Pow(26, colStr.Length - i - 1)).Sum();
var row = int.Parse(match.Groups["row"].ToString());
现在你可以使用一些循环从这个单元格读取数据:
for (var i = row; i < dataTable.Rows.Count; i++)
{
for (var j = col; j < dataTable.Columns.Count; j++)
{
var data = dataTable.Rows[i][j];
}
}
更新:
您可以使用此配置在读取时过滤Excel工作表的行和列:
var i = 0;
var conf = new ExcelDataSetConfiguration
{
UseColumnDataType = true,
ConfigureDataTable = _ => new ExcelDataTableConfiguration
{
FilterRow = rowReader => fromRow <= ++i - 1,
FilterColumn = (rowReader, colIndex) => fromCol <= colIndex,
UseHeaderRow = true
}
};
答案 1 :(得分:16)
为了更清楚,我将从头开始。
我将依赖https://exceldatareader.codeplex.com/中的示例代码,但需要进行一些修改以避免不便。
以下代码检测文件格式,xls或xlsx。
FileStream stream = File.Open(filePath, FileMode.Open, FileAccess.Read);
IExcelDataReader excelReader;
//1. Reading Excel file
if (Path.GetExtension(filePath).ToUpper() == ".XLS")
{
//1.1 Reading from a binary Excel file ('97-2003 format; *.xls)
excelReader = ExcelReaderFactory.CreateBinaryReader(stream);
}
else
{
//1.2 Reading from a OpenXml Excel file (2007 format; *.xlsx)
excelReader = ExcelReaderFactory.CreateOpenXmlReader(stream);
}
//2. DataSet - The result of each spreadsheet will be created in the result.Tables
DataSet result = excelReader.AsDataSet();
//3. DataSet - Create column names from first row
excelReader.IsFirstRowAsColumnNames = false;
现在我们可以更方便地访问文件内容。我使用DataTable。以下是访问特定单元格并在控制台中打印其值的示例:
DataTable dt = result.Tables[0];
Console.WriteLine(dt.Rows[rowPosition][columnPosition]);
如果您不想使用DataTable,可以执行以下操作:
Console.WriteLine(result.Tables[0].Rows[rowPosition][columnPosition]);
重要的是不要尝试超出表格的限制,为此您可以看到行数和列数,如下所示:
Console.WriteLine(result.Tables[0].Rows.Count);
Console.WriteLine(result.Tables[0].Columns.Count);
最后,当你完成后,你应该关闭阅读器并释放资源:
//5. Free resources (IExcelDataReader is IDisposable)
excelReader.Close();
我希望你觉得它很有用。
(我知道这个问题已经过时了,但我做了这个贡献来增强知识库,因为关于这个库的特定实现的材料很少。)
答案 2 :(得分:6)
对于ExcelDataReader v3.6.0及更高版本。 我为在Rows上进行迭代而苦苦挣扎。因此,上述代码还有更多内容。希望它对至少有帮助。
private void button1_Click(object sender, EventArgs e)
{
using (SqlConnection connection = new SqlConnection(myConnection))
{
SqlCommand command = connection.CreateCommand();
SqlTransaction transaction = connection.BeginTransaction("MyTransaction");
command.Connection = connection;
command.Transaction = transaction;
try
{
command.CommandText = $"Insert into Elevi(Name,Age) values({textBox1.Text},{textBox2.Text})";
command.ExecuteNonQuery();
transaction.Commit();
}
catch(Exception a)
{
MessageBox.Show(a.Message);
}
}
}
答案 3 :(得分:3)
一种方法:
FileStream stream = File.Open(@"c:\working\test.xls", FileMode.Open, FileAccess.Read);
IExcelDataReader excelReader = ExcelReaderFactory.CreateBinaryReader(stream);
excelReader.IsFirstRowAsColumnNames = true;
DataSet result = excelReader.AsDataSet();
result.Tables
包含工作表,result.tables[0].Rows
包含单元格行。
答案 4 :(得分:3)
我发现这对于从特定列和行
中读取非常有用user_capacity
答案 5 :(得分:0)
使用ExcelReaderFactory 3.1和更高版本非常容易:
using (var openFileDialog1 = new OpenFileDialog { Filter = "Excel Workbook|*.xls;*.xlsx;*.xlsm", ValidateNames = true })
{
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
var fs = File.Open(openFileDialog1.FileName, FileMode.Open, FileAccess.Read);
var reader = ExcelReaderFactory.CreateBinaryReader(fs);
var dataSet = reader.AsDataSet(new ExcelDataSetConfiguration
{
ConfigureDataTable = _ => new ExcelDataTableConfiguration
{
UseHeaderRow = true // Use first row is ColumnName here :D
}
});
if (dataSet.Tables.Count > 0)
{
var dtData = dataSet.Tables[0];
// Do Something
}
}
}
答案 6 :(得分:0)
public static DataTable ConvertExcelToDataTable(string filePath, bool isXlsx = false)
{
System.Text.Encoding.RegisterProvider(System.Text.CodePagesEncodingProvider.Instance);
//open file and returns as Stream
using (var stream = File.Open(filePath, FileMode.Open, FileAccess.Read))
{
using (var reader = ExcelReaderFactory.CreateReader(stream))
{
var conf = new ExcelDataSetConfiguration
{
ConfigureDataTable = _ => new ExcelDataTableConfiguration
{
UseHeaderRow = true
}
};
var dataSet = reader.AsDataSet(conf);
// Now you can get data from each sheet by its index or its "name"
var dataTable = dataSet.Tables[0];
Console.WriteLine("Total no of rows " + dataTable.Rows.Count);
Console.WriteLine("Total no of Columns " + dataTable.Columns.Count);
return dataTable;
}
}
}
答案 7 :(得分:-3)
您可以使用.NET库执行相同的操作,我认为这更直接。
string ConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0; data source={path of your excel file}; Extended Properties=Excel 12.0;";
OleDbConnection objConn = null;
System.Data.DataTable dt = null;
//Create connection object by using the preceding connection string.
objConn = new OleDbConnection(connString);
objConn.Open();
//Get the data table containg the schema guid.
dt = objConn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
string sql = string.Format("select * from [{0}$]", sheetName);
var adapter = new System.Data.OleDb.OleDbDataAdapter(sql, ConnectionString);
var ds = new System.Data.DataSet();
string tableName = sheetName;
adapter.Fill(ds, tableName);
System.Data.DataTable data = ds.Tables[tableName];
在数据表中包含数据后,您可以像通常使用DataTable类一样访问它们。