/// <summary>
/// 使用连接字符串初始化 <see cref="ConnectionString"/> 类的新实例。
/// </summary>
/// <param name="connectionString">数据库连接字符串。</param>
/// <exception cref="ArgumentNullException">connectionString 为 null。</exception>
public ConnectionString(string connectionString)
{
Guard.ArgumentNull(connectionString, nameof(connectionString));
Properties = new ConnectionProperties();
this.connectionString = ParseConnectionString(connectionString);
}