using ; // Introduce a namespace for dependency injection
using ; // Introduce a namespace for JSON processing
using System; // Introduce basic system functions
using ; // Introduce generic collection function
using ; // Introduce the namespace for SQLite database operations
using ; // Introduce the namespace for file operations
using ; // Introduce a namespace for HTTP network requests
using ; // Introduce a namespace for asynchronous programming
namespace ComplexConsoleApp
{
class Program
{
static async Task Main(string[] args)
{
// Configure service
var services = new ServiceCollection();
ConfigureServices(services);
var serviceProvider = ();
// Get an instance of the IDataProcessor implementation class and process data
var dataProcessor = <IDataProcessor>();
await ();
}
private static void ConfigureServices(IServiceCollection services)
{
// Register DataProcessor as an implementation of IDataProcessor
<IDataProcessor, DataProcessor>();
// Register DbConnectionFactory as an implementation of IDbConnectionFactory
<IDbConnectionFactory, DbConnectionFactory>();
}
}
// Data processing interface
public interface IDataProcessor
{
Task ProcessDataAsync(); // Asynchronously process data
}
public class DataProcessor : IDataProcessor
{
private readonly IDbConnectionFactory _dbConnectionFactory;
private const string ApiUrl = "/data"; // URL of API data
public DataProcessor(IDbConnectionFactory dbConnectionFactory)
{
_dbConnectionFactory = dbConnectionFactory;
}
public async Task ProcessDataAsync()
{
try
{
// Get data
var data = await FetchDataAsync();
// Process data
var processedData = ProcessData(data);
// Save data to the database
await SaveDataToDatabaseAsync(processedData);
// Write data to a file
WriteDataToFile(processedData);
}
catch (Exception ex)
{
// Capture and output exception information
($"Error:{}");
}
}
private async Task<List<DataItem>> FetchDataAsync()
{
using (var client = new HttpClient())
{
// Send HTTP GET request and get the response content
var response = await (ApiUrl);
// Convert JSON response content to a list of DataItem objects
return <List<DataItem>>(response);
}
}
private List<ProcessedDataItem> ProcessData(List<DataItem> data)
{
// Simulate data processing
var processedData = new List<ProcessedDataItem>();
foreach (var item in data)
{
// Convert the name of each data item to uppercase and calculate the length of the value
(new ProcessedDataItem
{
Id = ,
Name = (),
Value =
});
}
return processedData;
}
private async Task SaveDataToDatabaseAsync(List<ProcessedDataItem> data)
{
using (var connection = _dbConnectionFactory.CreateConnection())
{
await (); // Open the database connection
var transaction = (); // Start a transaction
foreach (var item in data)
{
// Create SQL command
var command = ();
= transaction;
= "INSERT INTO ProcessedData (Id, Name, Value) VALUES (@Id, @Name, @Value)";
("@Id", );
("@Name", );
("@Value", );
await (); // Execute SQL commands
}
(); // Submit transaction
}
}
private void WriteDataToFile(List<ProcessedDataItem> data)
{
using (var writer = new StreamWriter(""))
{
foreach (var item in data)
{
// Write processed data to a file
($"{}, {}, {}");
}
}
}
}
// Database connection factory interface
public interface IDbConnectionFactory
{
SQLiteConnection CreateConnection(); // Create SQLite connection
}
public class DbConnectionFactory : IDbConnectionFactory
{
private const string ConnectionString = "Data Source=;Version=3;"; // Database connection string
public SQLiteConnection CreateConnection()
{
return new SQLiteConnection(ConnectionString); // Create and return SQLite connection
}
}
// The original data item obtained from the API
public class DataItem
{
public int Id { get; set; } // The ID of the data item
public string Name { get; set; } // Name of the data item
public string Value { get; set; } // The value of the data item
}
// Processed data items
public class ProcessedDataItem
{
public int Id { get; set; } // The ID of the data item
public string Name { get; set; } // Name of the data item (convert to capital)
public int Value { get; set; } // The length of the value of the data item
}
}