C# 高级类型 Dictionary（学习笔记4）

key-value方式，key不可以重复，value可以。

namespace WindowsFormsApp1
{public partial class Form1 : Form{public Form1(){InitializeComponent();}private static Dictionary<int, string> dictionary = new Dictionary<int, string>{// 添加{ 1, "张三" },{ 2, "李四" },{ 3, "李四" },{ 4, "李四" },{ 5, "李四" },{ 6, "李四" }};private static int DICT_KEY = dictionary.Count;private readonly string id = "id";private readonly string names = "names";/// <summary>/// 添加数据 /// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void BtnAddData_Click(object sender, EventArgs e){listView1.BeginUpdate();listView1.View = View.Details;listView1.Items.Clear();// 清除旧数据listView1.Columns.Clear(); //清除列listView1.Columns.Add(id, id, 100);listView1.Columns.Add(names, names, 100);foreach (var item in dictionary){listView1.Items.Add(item.Key.ToString()).SubItems.Add(item.Value);}listView1.EndUpdate();}/// <summary>/// 遍历KEY/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void BtnAllKeyes_Click(object sender, EventArgs e){listView1.BeginUpdate();listView1.View = View.Details;listView1.Items.Clear();// 清除旧数据listView1.Columns.Clear(); //清除列listView1.Columns.Add(id, id, 100);foreach (var item in dictionary){listView1.Items.Add(item.Key.ToString());}listView1.EndUpdate();}/// <summary>/// 遍历数据/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void BtnAllValues_Click(object sender, EventArgs e){listView1.BeginUpdate();listView1.View = View.Details;listView1.Items.Clear();// 清除旧数据listView1.Columns.Clear(); //清除列listView1.Columns.Add(names, names, 100);foreach (var item in dictionary){listView1.Items.Add(item.Value);}listView1.EndUpdate();}/// <summary>///  遍历字典/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void BtnAllDict_Click(object sender, EventArgs e){listView1.BeginUpdate();listView1.View = View.Details;listView1.Items.Clear();// 清除旧数据listView1.Columns.Clear(); //清除列listView1.Columns.Add(id, id, 100);listView1.Columns.Add(names, names, 100);foreach (var item in dictionary){listView1.Items.Add(item.Key.ToString()).SubItems.Add(item.Value);}listView1.EndUpdate();}/// <summary>/// 删除数据/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void BtnDelData_Click(object sender, EventArgs e){if (listView1.SelectedItems.Count > 0 && listView1.Columns.ContainsKey(id)){int intID = Convert.ToInt32(listView1.SelectedItems[0].Text);dictionary.Remove(intID);listView1.Items.RemoveAt(listView1.SelectedItems[0].Index);}}/// <summary>/// 插入数据/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void BtnInsertData_Click(object sender, EventArgs e){dictionary.Add(++DICT_KEY, "Test" + Convert.ToString(DICT_KEY));if (listView1.Columns.Count > 1){listView1.Items.Add(DICT_KEY.ToString()).SubItems.Add(dictionary[DICT_KEY]);}else if (listView1.Columns.ContainsKey(id)){listView1.Items.Add(DICT_KEY.ToString());}else if (listView1.Columns.ContainsKey(names)){listView1.Items.Add(dictionary[DICT_KEY]);}}/// <summary>/// 修改数据/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void btnEditData_Click(object sender, EventArgs e){if (listView1.SelectedItems.Count > 0 && listView1.Columns.ContainsKey(names) && listView1.Columns.Count > 1){listView1.SelectedItems[0].SubItems[1].Text = listView1.SelectedItems[0].SubItems[1].Text + "1";int key = Convert.ToInt32(listView1.SelectedItems[0].SubItems[0].Text);dictionary[key] = listView1.SelectedItems[0].SubItems[1].Text;}}}
}