自定义区间百分比随机数产生

怼烎@ 2022-01-28 09:55 205阅读 0赞

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Jhb2JpbmdqaQ_size_16_color_FFFFFF_t_70]

private void button1_Click(object sender, EventArgs e)
            {
                textBox4.Text = "";
                int[] count = new int[10]{0,0,0,0,0,0,0,0,0,0};
                ArrayList arr = new ArrayList();
                Random rd = new Random();
    
                int allcount = Convert.ToInt32(txtAllCount.Text.Trim());//总数
                int min = Convert.ToInt32(textBox3.Text.Trim());
                int max= Convert.ToInt32(textBox5.Text.Trim());
                int start = Convert.ToInt32(textBox1.Text.Trim());
                int end = Convert.ToInt32(textBox2.Text.Trim());
                int percentnum = (int)(Convert.ToDouble(comboBox1.Text.Trim()) / 100.0 * allcount);
                int lastnum = allcount - percentnum;
    
                CustomRandom mycust = new CustomRandom();
                Stopwatch sw1 = new Stopwatch();
                sw1.Start();
                arr = mycust.customRandomCalc(allcount, min, max, start, end, Convert.ToDouble(comboBox1.Text.Trim()) / 100.0);
    
                //int index = 0;
                //int value = 0;
                //while (true)
                //{
                //    value = rd.Next(start, end + 1);
                //    arr.Add(value);
                //    if (++index >= percentnum)
                //    {
                //        break;
                //    }
                //}
                //index = 0;
                //while (true)
                //{
                //    value = rd.Next(min, max + 1);
                //    if (value >= start && value <= end)
                //    {
                //        continue;
                //    }
                //    else
                //    {
                //        arr.Add(value);
                //        if (++index >= lastnum)
                //        {
                //            break;
                //        }
                //    }
                //}
    
    
                sw1.Stop();
                TimeSpan ts1 = sw1.Elapsed;
                textBox6.Text = ts1.TotalMilliseconds.ToString() + "ms";
    
                ArrayList arr2 = new ArrayList();
                Random rd2 = new Random();
                int cccc = 0;
                Stopwatch sw2 = new Stopwatch();
                sw2.Start();
                int value2 = 0;
                while (true)
                {
                    value2 = rd2.Next(min, max + 1);
                    arr2.Add(value2);
                    if (++cccc > allcount)
                    {
                        break;
                    }
    
                }
    
                sw2.Stop();
                TimeSpan ts2 = sw2.Elapsed;
                textBox7.Text = ts2.TotalMilliseconds.ToString() + "ms";
                
    
    
                arr.Sort();
                int counta = 0;
                int countb = 0;
                string outStr=null;
                foreach (int i in arr)
                {
                 outStr += i + ",";
                  if (i >= start && i <= end)
                  {
                      countb++;
                  }
                  counta++;
                }
                listBox1.Items.Clear();
                textBox4.Text = outStr.Trim(',');
                listBox1.Items.Add("总个数："+counta.ToString());
                listBox1.Items.Add("自定义：" + countb.ToString());
                int pec = (int)((countb*1.0) / (counta*1.0) * 100+0.4);
                listBox1.Items.Add("百分比：" + pec.ToString()+"%");  
            }
    
    	class CustomRandom
        {
            public int sampleCount { get; set; }//样本总数
            public int sampleMin { get; set; }//样本起始值
            public int sampleMax { get; set; }//样本结束值
            public int customMin { get; set; }//自定义样本区间起始值
            public int customMax { get; set; }//自定义样本区间结束值
            public double customPercent { get; set; }//自定义样本占比
    
            public ArrayList customRandomCalc(int sampleCount, int sampleMin, int sampleMax, int customMin, int customMax, double customPercent)
            {
                ArrayList valueList = new ArrayList ();
                Random rd = new Random();
    
                int index = 0;
                int value = 0;
                int percentnum = (int)(customPercent * sampleCount);
                while (true)
                {
                    value = rd.Next(customMin, customMax + 1);
                    valueList.Add(value);
                    if (++index >= percentnum)
                    {
                        break;
                    }
                }
                index = 0;
                while (true)
                {
                    value = rd.Next(sampleMin, sampleMax + 1);
                    if (value >= customMin && value <= customMax)
                    {
                        continue;
                    }
                    else
                    {
                        valueList.Add(value);
                        if (++index >= (sampleCount - percentnum))
                        {
                            break;
                        }
                    }
                }
                return valueList;
            }
            
        }

//目前这个简单功能已经能够满足项目使用，如果更高效的方法欢迎推荐！

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Jhb2JpbmdqaQ_size_16_color_FFFFFF_t_70]: /images/20220128/2efea6b15b81495f92a9525bcf7270d6.png