Question

我还有另外两个按钮，它们的代码几乎完全相同。但是，当我尝试运行此代码以获取所有结果时，出现错误“ System.IndexOutOfRangeException”。

“显示无效的NHS号码”按钮有效，但我看不到为什么，但是“显示所有记录”按钮无效。错误在下面的代码块的dgvResults部分中，而不是在第一个代码块中。

 private void cmdShowInvalidNHSnumbers_Click(object sender, EventArgs e)
    {
        string databaseFilename;
        string sql;

        dgvResults.ColumnCount = 3;
        dgvResults.Columns[0].Name = "NHSNumber";
        dgvResults.Columns[1].Name = "Patient";
        dgvResults.Columns[2].Name = "Problem";

        dgvResults.Rows.Clear();

        databaseFilename = Application.StartupPath + "\\nhsnumberchecker.db";

        System.Data.SQLite.SQLiteConnection m_dbConnection;
        m_dbConnection = new System.Data.SQLite.SQLiteConnection("Data Source=" + databaseFilename + ";Version=3;");
        m_dbConnection.Open();

        sql = @"
        SELECT * FROM results
        -- WHERE NHSNumber = 'N'
        WHERE NHSNumberValid = 'N'
        ORDER BY Surname;";

        System.Data.SQLite.SQLiteCommand command = new System.Data.SQLite.SQLiteCommand(sql, m_dbConnection);

        System.Data.SQLite.SQLiteDataReader reader = command.ExecuteReader();
        while (reader.Read())
        {
            dgvResults.Rows.Add(reader["NHSNumber"], reader["Surname"] + ", " + reader["GivenName"], NHSnumberError(reader.GetString(0)));
        }

        dgvResults.Refresh();
        dgvResults.AutoResizeColumns();
        m_dbConnection.Close();
    }







 private void cmdShowAllResults_Click(object sender, EventArgs e)
    {
        string databaseFilename;
        string sql;

        dgvResults.ColumnCount = 7;
        dgvResults.Columns[0].Name = "NHSNumber";
        dgvResults.Columns[1].Name = "DOB";
        dgvResults.Columns[2].Name = "Title";
        dgvResults.Columns[3].Name = "Surname";
        dgvResults.Columns[4].Name = "GivenName";
        dgvResults.Columns[5].Name = "Gender";
        dgvResults.Columns[6].Name = "Problem";

        dgvResults.Rows.Clear();

        databaseFilename = Application.StartupPath + "\\nhsnumberchecker.db";

        System.Data.SQLite.SQLiteConnection m_dbConnection;
        m_dbConnection = new System.Data.SQLite.SQLiteConnection("Data Source=" + databaseFilename + ";Version=3;");
        m_dbConnection.Open();

        sql = @"
        SELECT * FROM results
        ORDER BY Surname;";

        System.Data.SQLite.SQLiteCommand command = new System.Data.SQLite.SQLiteCommand(sql, m_dbConnection);

        System.Data.SQLite.SQLiteDataReader reader = command.ExecuteReader();
        while (reader.Read())
        {
            dgvResults.Rows.Add(reader["NHSNumber"], reader["DOB"], reader["Title"], reader["Surname"] + ", " + reader["GivenName"],
                reader["Gender"], reader["Problem"], NHSnumberError(reader.GetString(0))); //This section is causing the error
        }

        dgvResults.Refresh();
        dgvResults.AutoResizeColumns();
        m_dbConnection.Close();
    }
}

代码的下部是获取错误消息的部分。我不知道其中的哪一部分“超出范围”。

Answer 1

也许您的查询结果包含一个“，”字符。尝试通过添加替换方法来修改所有条目，以查看是否正确：

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为什么我得到System.IndexOutOfRangeException

1 个答案: