统计用户输入的一串数字中每个数字出现的次数

ArrayList list = new ArrayList();

            int EveNum = 0;

            foreach (var item in textBox1.Text.Trim())

            {

                if (!list.Contains(item))

                {

                    list.Add(item);

                }

            }

            foreach (var f in list)

            {

                EveNum = 0;

foreach (var z in textBox1.Text.Trim())

                {

                    if (f.ToString() == z.ToString())

                    {

                        EveNum++;                   

                    }

                  

           }

                textBox2.Text += f.ToString() + "," + EveNum.ToString() + "次"+"n";

                   

            }    

         以下方法是由上面方法变化而来了

             textBox2.Text = "";

            ArrayList list = new ArrayList();

            int EveNum = 0;

            foreach (var item in textBox1.Text.Trim())

            {

                if (!list.Contains(item))

                {

                    list.Add(item);

                    EveNum = 0;

                    foreach (var z in textBox1.Text.Trim())

                    {

                        if (item.ToString() == z.ToString())

                        {

                            EveNum++;

         
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               }

                    }

                    textBox2.Text += item.ToString() + "," + EveNum.ToString() + "次" + "\r\n";

                }

            }