C# 在asp.net中将参数传递到excel查询

我想使用OleDB读取excel文件，但在查询中插入参数时，出现以下OleDB异常：

没有为一个或多个必需参数提供值

代码

---

参数名称应为CODICE\u FISCALE，而不是Param1。试试这个代码

var conn = String.Format(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties=""Excel 12.0 Xml;HDR=YES"";", opFileImport.FileName);
string sql = "Select CODICE_FISCALE From [Parte_4$] ";
sql += "where CODICE_FISCALE = ?";
DataTable dt = new DataTable();
using (OleDbConnection excelConn = new OleDbConnection(conn))
{
    using (OleDbDataAdapter dataAdapter = new OleDbDataAdapter())
    {
        dataAdapter.SelectCommand = new OleDbCommand(sql, excelConn);
        dataAdapter.SelectCommand.Parameters.Add(new OleDbParameter("CODICE_FISCALE", strCodFisc));
        dataAdapter.Fill(dt);
    }
}

var conn = String.Format(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties=""Excel 12.0 Xml;HDR=YES"";", opFileImport.FileName);
string sql = "Select CODICE_FISCALE From [Parte_4$] ";
sql += "where CODICE_FISCALE = ?";
DataTable dt = new DataTable();
using (OleDbConnection excelConn = new OleDbConnection(conn))
{
    using (OleDbDataAdapter dataAdapter = new OleDbDataAdapter())
    {
        dataAdapter.SelectCommand = new OleDbCommand(sql, excelConn);
        dataAdapter.SelectCommand.Parameters.Add(new OleDbParameter("CODICE_FISCALE", strCodFisc));
        dataAdapter.Fill(dt);
    }
}