2.5.33 #

internal class TransactionGenerator
{
    private static readonly Random Random = new();

    /// <summary>
    /// 生成 n 条随机交易记录。
    /// </summary>
    /// <param name="n">交易记录的数量。</param>
    /// <returns></returns>
    public static Transaction[] Generate(int n)
    {
        var trans = new Transaction[n];
        for (var i = 0; i < n; i++)
        {
            trans[i] = new Transaction
            (GenerateName(), 
                GenerateDate(), 
                Random.NextDouble() * 1000);
        }
        return trans;
    }

    /// <summary>
    /// 获取随机姓名。
    /// </summary>
    /// <returns></returns>
    private static string GenerateName()
    {
        var nameLength = Random.Next(4, 7);
        var sb = new StringBuilder();

        sb.Append(Random.Next('A', 'Z' + 1));
        for (var i = 1; i < nameLength; i++)
            sb.Append(Random.Next('a', 'z' + 1));

        return sb.ToString();
    }

    /// <summary>
    /// 获取随机日期。
    /// </summary>
    /// <returns></returns>
    private static Date GenerateDate()
    {
        var year = Random.Next(2017, 2019);
        var month = Random.Next(1, 13);
        int day;
        if (month == 2)
            day = Random.Next(1, 29);
        else if ((month < 8 && month % 2 == 1) ||
                 (month > 7 && month % 2 == 0))
            day = Random.Next(1, 32);
        else
            day = Random.Next(1, 31);

        var date = new Date(month, day, year);
        return date;
    }
}