Question

我正在

IErrorInfo.GetDescription因E_FAIL（0x80004005）而失败

我不知道这意味着什么，也不知道如何解决它。当我将acact查询粘贴并粘贴到我的Acces-db并运行它时，它就像一个魅力，但是当我尝试在c＃中运行它时，我得到了这个错误。

所有参数都填充了正确的值。

@aankomst = 15-11-2017, @vertrek = 20-11-2017, @grootte = "large"

    try
    {
        standplaatslijst.Clear();
        verbinding = new OleDbConnection(
        @"Provider=Microsoft.ACE.OLEDB.12.0;
        Data Source=..\..\..\La_Rustique.accdb;
        Persist Security Info=False;");
        verbinding.Open();

        OleDbCommand query = new OleDbCommand();
        OleDbDataReader lezer = null;
        query.CommandText = @"SELECT *
                              FROM standplaats
                              WHERE id not in (SELECT standplaats_id
                              FROM reservering
                               WHERE @aankomst BETWEEN aankomst AND vertrek
                               AND @vertrek BETWEEN aankomst AND vertrek)
                               AND size = @grootte";

        query.Connection = verbinding;

        query.Parameters.Add(new OleDbParameter("@aankomst", OleDbType.DBDate));
        query.Parameters["@aankomst"].Value = aankomst;
        query.Parameters.Add(new OleDbParameter("@vertrek", OleDbType.DBDate));
        query.Parameters["@vertrek"].Value = vertrek;
        query.Parameters.Add(new OleDbParameter("@grootte", OleDbType.VarChar));
        query.Parameters["@grootte"].Value = grootte;

        lezer = query.ExecuteReader();

        while (lezer.Read())
        {
            standplaatslijst.Add(new standplaats(lezer));
        }
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
    finally
    {
        verbinding.Close();
    }

我将读者添加到名为standplaats的新类中，如下所示：

public standplaats(OleDbDataReader lezer)
    {
        _id = lezer.GetInt32(0);
        Grootte = lezer.GetString(1);
        Name = lezer.GetString(2);
    }

Answer 1

SIZE是MS Access中的保留字。

将查询更改为：

query.CommandText = @"SELECT *
                      FROM standplaats
                      WHERE id not in (SELECT standplaats_id
                      FROM reservering
                       WHERE @aankomst BETWEEN aankomst AND vertrek
                       AND @vertrek BETWEEN aankomst AND vertrek)
                       AND [size] = @grootte";

Here你找到了保留字的列表。

IErrorInfo.GetDescription失败并带有E_FAIL（0x80004005）C＃

1 个答案: