在C#中使用oledb获取Excel数据范围 [英] Get Excel data range using oledb in c#
问题描述
我想通过使用oledb获取excel工作表使用的数据范围.代码在下面,
I want to get excel sheet used data range by using oledb. Code is below,
String strExcelConn = "Provider=Microsoft.Jet.OLEDB.4.0;"
+ "Data Source=E:\\DOTNET\\CrsMicro\\CA.xls;"
+ "Extended Properties='Excel 8.0;HDR=Yes'";
using (OleDbConnection connExcel = new OleDbConnection(strExcelConn))
{
string selectString = "SELECT * FROM [CA$A1:D500]";
using (OleDbCommand cmdExcel = new OleDbCommand(selectString,connExcel))
{
cmdExcel.Connection = connExcel;
connExcel.Open();
DataTable dt=new DataTable();
OleDbDataAdapter adp = new OleDbDataAdapter();
adp.SelectCommand = cmdExcel;
adp.FillSchema(dt, SchemaType.Source);
adp.Fill(dt);
int range=dt.Columns.Count;
int row = dt.Rows.Count;
//var result = cmdExcel.ExecuteReader();
//DataTable dtExcelSchema;
//dtExcelSchema = connExcel.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
// string excelsheetname = dtExcelSchema.Rows[0].ItemArray[2].ToString();
connExcel.Close();
//string sheetName = dtExcelSchema.Rows[0]["TABLE_NAME"].ToString();
}
}
我的工作表范围并不总是A1:D500,它可能经常变化.因此,我需要动态获取工作表范围.我知道这可以通过互操作来实现,但是我需要在oledb中完成.有什么建议吗?
my sheet range is not always A1:D500, it may vary frequently. So i need to get the sheet range dynamically. I know this can be achieved by interop, but i need to do it in oledb. Any suggestion?
推荐答案
我也在OLEDB C#excel中处理相同类型的问题,下面找到了解决方案.这个对我有用.但是我是C#的新手,我不确定它的效率如何.到目前为止,它满足了我的要求.这可能对其他人有帮助.
Hi I'm also working on same kind of problem in OLEDB C# excel, I found below solution. It works for me. But I'm new to C#, I'm not sure how efficient it is. But it is satisfying my requirements so far. This may be helpful for others.
我能够从浏览的输入Excel文件中获取Excel工作表中的动态范围(确保Excel文件不包含隐藏工作表).这非常适合包含单张纸的Excel工作簿.我没有用多张纸进行测试.
I was able to get dynamic range in an excel sheet from a browsed input excel file (make sure excel file doesn't contain hidden sheets). This works perfectly for excel workbook containing single sheet. I haven't tested with multiple sheets.
范围:A [统计值]:列名[0]//返回从起始值到列名的所有行.示例:A1:M0//它将返回从A1到M列的所有行.因此,这里不必担心您的excel中有多少行.只需给出Column Name [0],就可以从开始到M列获取所有行.因此,"0"将是我们的外部范围.
Range: A [stat value]: Column Name[0] // Returns all rows from start value till the column name. Example: A1:M0 // It will return all rows from A1 till column M. So here no need to worry how many rows you have in your excel. Just by giving Column Name[0] takes all rows from the starting till the column M. So '0' will be our outer range.
//Code under actual c# clas file where we are uploading excel.
Excel_Common excelComm = new Excel_Common(); // object to Excel_Common class file
string rangeStringwithSHeet =excelComm.GetSheetName(filepath).ToString().Trim('\'') + GetRange(excelComm.GetSheetName(filepath), excelComm.ExcelConn(filepath));
queryForExcelInput = string.Format("SELECT * FROM [{0}]", rangeStringwithSHeet);
Econ1 = new OleDbConnection(excelComm.ExcelConn(filepath));
Econ1.Open();
dataExcelInputTable = new DataTable();
OleDbCommand oleDbCommand1 = new OleDbCommand(queryForExcelInput, Econ1);
OleDbDataAdapter oleDbDaAdapter1 = new OleDbDataAdapter(oleDbCommand1);
oleDbDaAdapter1.Fill(dataExcelInputTable);
Excel_Common类文件具有以下方法:
//Get Range like A4:M30
public string GetRange(string SheetName, string excelConnectionString)
{
string rangeInput = "",rangeColName="";
int columnsCount = 0;
int rowStartRange = 0;
columnsCount = GetNumberOfColumnsInSheet(SheetName, excelConnectionString);
rowStartRange = GetStartRowRange(SheetName, excelConnectionString); // This is optional if you want always A1. just assign 1 here
while (columnsCount > 0)
{
columnsCount--;
rangeColName = (char)('A' + columnsCount % 26) + rangeColName;
columnsCount /= 26;
}
rangeInput = "A" + rowStartRange + ":" + rangeColName + "0";
return rangeInput;
}
// Get Sheet Name assuming only one sheet for workbook and no hidden sheets
public string GetSheetName(string filepath)
{
string sheetname = "";
String connect = ExcelConn(filepath);
OleDbConnection con = new OleDbConnection(connect);
con.Open();
DataTable tables = con.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "TABLE" });
foreach (DataRow row in tables.Rows)
{
sheetname = row[2].ToString();
if (!sheetname.EndsWith("$"))
continue;
}
con.Close();
return sheetname;
}
// Get number of columns in a given sheet
public int GetNumberOfColumnsInSheet(string SheetName, string excelConnectionString)
{
int columnsCount = 0;
//If a valid excel file
if (!string.IsNullOrEmpty(excelConnectionString))
{
using (OleDbConnection conn = new OleDbConnection(excelConnectionString))
{
conn.Open();
DataTable dt = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Columns, null);
if (dt.Rows.Count > 0)
columnsCount = dt.AsEnumerable().Where(a => a["TABLE_NAME"].ToString() == SheetName).Count();
conn.Close();
}
}
return columnsCount;
}
// Get the first row count in sheet contains some keyword . This method call is optional if you always want A1. Here I need to check some keyword exist and from there only I have to start something like A4
public int GetStartRowRange(string SheetName, string excelConnectionString)
{
int rowStartRange = 1;
//If a valid excel file
if (!string.IsNullOrEmpty(excelConnectionString))
{
using (OleDbConnection conn = new OleDbConnection(excelConnectionString))
{
string colValue;
conn.Open();
string cmdstr = "select * from [" + SheetName + "]";
OleDbCommand com = new OleDbCommand(cmdstr, conn);
DataTable dt = new DataTable();
OleDbDataAdapter da = new OleDbDataAdapter(com);
da.Fill(dt);
// get first row data where it started
foreach (DataRow dataRow in dt.Rows)
{
colValue = dataRow[0].ToString();
if ((colValue.Contains("Value1") || colValue.Contains("Value2") || colValue.Contains("Value3")) && (string.IsNullOrEmpty(dataRow[1].ToString()) == false))
{
rowStartRange = rowStartRange + 1;
break;
}
else
{
rowStartRange = rowStartRange + 1;
}
}
conn.Close();
}
}
return rowStartRange;
}
// Connection to excel document
public string ExcelConn(string FilePath)
{
string constr = "";
string extension = Path.GetExtension(FilePath);
//Checking for the extentions, if XLS connect using Jet OleDB
if (extension.Equals(".xls", StringComparison.CurrentCultureIgnoreCase))
{
constr = string.Format("Provider=Microsoft.Jet.OLEDB.4.0; Data Source={0};Extended Properties=\"Excel 12.0;IMEX=1;HDR=YES\"", FilePath);
}
//Use ACE OleDb if xlsx extention
else if (extension.Equals(".xlsx", StringComparison.CurrentCultureIgnoreCase))
{
constr = string.Format("Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties=\"Excel 8.0;IMEX=1;HDR=YES\"", FilePath);
}
return constr;
} // end of ExcelConn method
这篇关于在C#中使用oledb获取Excel数据范围的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!