return dataTable;报错

如果 `return dataTable;` 报错了，可能是因为方法的返回类型不是 `DataTable`，或者因为方法中没有引用 `System.Data` 命名空间。您可以尝试修改代码如下：

using System.Data;
using System.Data.SQLite;

public static DataTable QuerySQLite()
{
    string connectionString = "Data Source=your_database_path";
    string query = "SELECT COUNT(CASE WHEN Q1 IS NOT NULL THEN 1 END) AS Q1Count, COUNT(CASE WHEN Q2 IS NOT NULL THEN 1 END) AS Q2Count, COUNT(CASE WHEN Q3 IS NOT NULL THEN 1 END) AS Q3Count, COUNT(CASE WHEN Q4 IS NOT NULL THEN 1 END) AS Q4Count FROM your_table_name WHERE 审核结论 IS NOT NULL";

    using (SQLiteConnection connection = new SQLiteConnection(connectionString))
    {
        connection.Open();
        using (SQLiteCommand command = new SQLiteCommand(query, connection))
        {
            using (SQLiteDataAdapter adapter = new SQLiteDataAdapter(command))
            {
                DataTable dataTable = new DataTable();
                adapter.Fill(dataTable);
                return dataTable;
            }
        }
    }
}

如果问题仍然存在，请提供更多的错误信息，以便更好地诊断问题。