Question

我正在使用epplus在excel模板中在文件中写入大量信息，但之后我需要关闭ExcelPackage才能与Excel应用程序一起使用。它抛出了我的异常：“System.Runtime.InteropServices.COMException（0x800A03EC）：来自HRESULT的异常：0x800A03EC”

    private void FillCardsSheet()
    {
        xlPackage = new ExcelPackage(Template);

        wsCards = xlPackage.Workbook.Worksheets[4];

        string command = "SELECT * FROM dbo_serial_cards WHERE type <> 'EXT' AND LEFT([device_tag], 2) <> '!!'";
        OleDbCommand cmd = new OleDbCommand(command, CON);
        OleDbDataReader reader = cmd.ExecuteReader();
        int row = 1;
        while (reader.Read())
        {
            row++;
            for (int col = 1; col <= 16; col++)
            {
                wsCards.Cells[row, col].Value = reader.GetValue(col - 1);
            }
        }

        xlPackage.SaveAs(Template);
        xlPackage.Dispose();
    }

Answer 1

很难说没有关于你的连接和对象的更多细节。什么是'模板'？如果你说哪一行产生错误可能会有帮助（如提到的@mason）。这是你似乎得到的COM错误，所以它可能与数据库连接或包本身有关。由于在方法之外管理包，因此确保它没有被锁定或关闭。

这对我连接本地SQL Server数据库很好：

[TestMethod]
public void SQL_Reader_Test()
{
    var Template = new FileInfo(@"c:\temp\temp.xlsx");
    if (Template.Exists)
        Template.Delete();

    var xlPackage = new ExcelPackage(Template);

    //var wsCards = xlPackage.Workbook.Worksheets[4];
    var wsCards = xlPackage.Workbook.Worksheets.Add("Cards");

    //const string constring = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\temp\northwind.mdb;Persist Security Info=False;";
    const string constring = @"Provider=SQLNCLI11;Data Source=MYMACHINENAME\SQLEXPRESS;Initial Catalog=AdventureWorks;UID=AdventureWorks; Pwd=AdventureWorks";

    using (var CON = new OleDbConnection(constring))
    {
        CON.Open();

        //string command = "SELECT * FROM dbo_serial_cards WHERE type <> 'EXT' AND LEFT([device_tag], 2) <> '!!'";
        const string command = "SELECT * FROM Person.Address";
        var cmd = new OleDbCommand(command, CON);
        var reader = cmd.ExecuteReader();

        int row = 1;
        while (reader.Read())
        {
            row++;
            //for (int col = 1; col <= 16; col++)
            for (int col = 1; col <= reader.FieldCount; col++)
            {
                wsCards.Cells[row, col].Value = reader.GetValue(col - 1);
            }
        }

        xlPackage.SaveAs(Template);
        xlPackage.Dispose();
    }
}

Answer 2

尝试在Using-Block中使用ExcelPackage：

using (ExcelPackage xlsPackage = new ExcelPackage(Template))
{
    // Your Code
    xlPackage.SaveAs(Template);
}

如何在C＃中使用EPPlus关闭ExcelPackage？

2 个答案: