如何在字典中存储值？ [复制]

Question

我使用以下get set 方法创建了一个Windows 窗体应用程序。 name, email 和 phone 是硬编码的，因此可以通过创建对象来存储值

    public string Name { get; set; }
    public string Email { get; set; }
    public string Phone { get; set; }

    public Dictionary<String, String> facilities { get; set; }


    Rating r = new Rating(); //object creating
        r.Name = txtName.Text; //get value from textbox and assing to property
        r.Email = txtEmail.Text;
        r.Phone = txtPhone.Text;

但是对于工具来说，comboBox用于数据来自txt文件的地方

       int locationX = 143;
        int locationY = 200;
        string line;
        System.IO.StreamReader file =
            new System.IO.StreamReader(@"facilities.txt");
        while ((line = file.ReadLine()) != null)
        {
            // Remove the extra ','
            string comboName = line.Substring(0, line.Length - 1);

            ComboBox comboBox = new ComboBox();
            comboBox.Name = comboName;
            comboBox.Items.AddRange(new object[] { 1, 2, 3, 4 });
            comboBox.Location = new Point(locationX, locationY);
            
            this.tabPage1.Controls.Add(comboBox);

            Label label = new Label();
            label.Text = comboName;
            label.Location = new Point(0, locationY);
            
            this.tabPage1.Controls.Add(label);


            locationY += 50;
        }

        file.Close();
      }

如何将其数据存储在字典中？ 我尝试使用相同的概念

             ComboBox parking= (ComboBox)this.Controls.Find("parking facility", true)[0];
          //MessageBox.Show(parking.Text);
         r.facilities.Add("parking facility", parking.Text);

但得到 System.NullReferenceException: '对象引用未设置为对象的实例。'错误

Answer 1

可枚举对象需要初始化。

r.facilities = new Dictionary <String,String>();
r.facilities.Add ("parking facility", parking.Text);