学步园

　　这是一个在c#中使用集合的一个小小的例子，里面涉及到了　Hashtable，ArrayList，集合的排序，枚举器，集合的遍历，成员的查找。

　　例子如下：

Form1代码：

 public partial class Form1 : Form
    ...{
        public Form1()
        ...{
            InitializeComponent();
        }
        public string rInfo;
        public int rInfo2;

        private void button1_Click(object sender, EventArgs e)
        ...{
            
            Hashtable hTable = new Hashtable();
            int flag = 0;

            try
            ...{
                hTable.Add(5, new animal(5, "red bull"));
                hTable.Add(6, new animal(6, "blue lion"));
                hTable.Add(4, new animal(4, "green fly"));
                hTable.Add(2, new animal(2, "yellow dog"));
                hTable.Add(3, new animal(3, "white horse"));
                hTable.Add(1, new animal(1, "black pig"));
            }
            catch (Exception Ex)
            ...{
                MessageBox.Show (Ex.Message);
            }

            //用ArrayList对键进行排序
            ArrayList aList = new ArrayList(hTable.Keys);
            aList.Sort();

            //遍历器打印排序后的结果
            IDictionaryEnumerator iDicEnumerator = hTable.GetEnumerator();
            System.Text.StringBuilder sb=new System.Text.StringBuilder();
            while (iDicEnumerator.MoveNext())
            ...{
                animal oAnimal = (animal)hTable[iDicEnumerator.Key];
                sb.AppendLine (oAnimal.code + " " + oAnimal.name);
            }
            MessageBox.Show(sb.ToString());
            //查找动物名字
            Form2 oF2 = new Form2(this, "0");
            oF2.ShowDialog();
       
            foreach (int sCode in aList)
            ...{
                animal oAnimal = (animal)hTable[sCode];
                if (oAnimal.name == rInfo)
                ...{
                    MessageBox.Show("查找结果：代码为" + oAnimal.code );
                    flag = 1;
                    break;
                }
            }
            if (flag == 0)
            ...{
                MessageBox.Show("没有这个动物！");
            }

            //查找动物代码
            Form2 oF3= new Form2(this, "1");
            oF3.ShowDialog();
            if (hTable.ContainsKey(rInfo2))
            ...{
                animal s = (animal)hTable[rInfo2];
                MessageBox.Show("查找结果：动物名字为" + s.name);
            }
            else
            ...{
                MessageBox.Show("没有找到这样的动物！");
            }

        }

      
    }

    class animal
    ...{
        public int code;
        public string name;

        public animal(int Code, string Name)
        ...{
            this.code = Code;
            this.name = Name;
        }
    }

form2的代码：

 public partial class Form2 : Form
    ...{
        Form1 kk;
        string rFlag="";
        public Form2(Form1 k,string flag)
        ...{
            InitializeComponent();
            kk = k;
            rFlag = flag;
            if (rFlag == "1")
            ...{
                textBox1.ReadOnly = true;
                textBox1.Text = "1";
            }
        }

        private void button1_Click(object sender, EventArgs e)
        ...{
            if (this.textBox1.Text.Trim() != "")
            ...{
                if (rFlag == "0")
                ...{
                    kk.rInfo = this.textBox1.Text;
                }
                else
                ...{
                    kk.rInfo2 = Convert.ToInt32(this.textBox1.Text);
                }
                
                this.Close();
            }
        }

        private void textBox1_MouseDoubleClick(object sender, EventArgs e)
        ...{
            int liu = Convert.ToInt32(this.textBox1.Text) + 1;
            if(liu>6) 
                 this.textBox1.Text="1";
             this.textBox1.Text = liu.ToString();
        }


       
    }