無法在Visual Studio中處理的SelectedIndexChanged財產

Question

using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Linq; 
using System.Text; 
using System.Windows.Forms; 

namespace WindowsFormsApplication2 
{ 
    public partial class Form1 : Form 
    { 
     Dictionary<Prime_Broker, Margin2> myDictionary = new Dictionary<Prime_Broker, Margin2>(); 
     public Form1() 
     { 
      InitializeComponent(); 

      Prime_Broker pr1 = new Prime_Broker("Deutsche Bank", "z", "india"); 
      Prime_Broker pr2 = new Prime_Broker("Deutsche Bank1", "z", "india"); 
      Prime_Broker pr3 = new Prime_Broker("Deutsche Bank2", "z", "india"); 
      Prime_Broker pr4 = new Prime_Broker("Deutsche Bank3", "z", "india"); 
      Prime_Broker pr5 = new Prime_Broker("Deutsche Bank4", "z", "india"); 

      Margin2 mr1 = new Margin2(30, 40, 50); 
      Margin2 mr2 = new Margin2(301, 40, 50); 
      Margin2 mr3 = new Margin2(302, 40, 50); 
      Margin2 mr4 = new Margin2(303, 40, 50); 
      Margin2 mr5 = new Margin2(304, 40, 50); 





      //myDictionary.Add(new Prime_Broker("Deutsche Bank", "z", "india"), new Margin2(30, 40, 50)); 
      //myDictionary.Add(new Prime_Broker("Deutsche1 Bank", "z", "india"), new Margin2(301, 40, 50)); 
      //myDictionary.Add(new Prime_Broker("Deutsche2 Bank", "z", "india"), new Margin2(302, 40, 50)); 
      //myDictionary.Add(new Prime_Broker("Deutsche3 Bank", "z", "india"), new Margin2(303, 40, 50)); 

      myDictionary.Add(pr1, mr1); 
      myDictionary.Add(pr2, mr2); 
      myDictionary.Add(pr3, mr3); 
      myDictionary.Add(pr4, mr4); 
      myDictionary.Add(pr5, mr5); 
     } 

     public class Prime_Broker 
     { 
      public string Name { set; get; } 
      public string Symbol { set; get; } 
      public string Address { set; get; } 

      public Prime_Broker(string name, string symbol, string address) 
      { 
       this.Name = name; 
       this.Symbol = symbol; 
       this.Address = address; 
      } 

     } 

     public void Form1_Load(object sender, EventArgs e) 
     { 
      List<Prime_Broker> lst_broker = new List<Prime_Broker>(); 

      lst_broker.Add(new Prime_Broker("Deutsche Bank", "z", "india")); 
      lst_broker.Add(new Prime_Broker("Deutsche1 Bank", "z", "india")); 
      lst_broker.Add(new Prime_Broker("Deutsche2 Bank", "z", "india")); 
      lst_broker.Add(new Prime_Broker("Deutsche3 Bank", "z", "india")); 


      listBox1.DataSource = lst_broker; 
      listBox1.DisplayMember = "Name"; 
      listBox1.ValueMember = "name"; 
      //listBox1.Items.AddRange(lst_broker.ToArray()); 
      dataGridView1.DataSource = lst_broker; 

     } 

     public class Margin2 
     { 
      public int Maintainence_margin { set; get; } 
      public int Initial_margin { set; get; } 
      public int Commission_fees_percentage { set; get; } 

      public Margin2(int M_margin, int I_margin, int CF_Percentage) 
      { 
       this.Maintainence_margin = M_margin; 
       this.Initial_margin = I_margin; 
       this.Commission_fees_percentage = CF_Percentage; 
      } 

     } 

     public void listBox1_SelectedValueChanged(object sender, EventArgs e) 
     { 
      Form1 fr = new Form1(); 


      //List<fr.myDictionary> lst_broker = new List<Prime_Broker>(); 

     } 



    } 
} 

嗨

這是我的代碼，我試圖將數據添加到列表框，現在我想顯示列表框選擇指數的字典的數據文本框，但無法做到。 如何將字典數據綁定到列表框和新的texbox

像這裏如果選擇「deutchBank1」，現在文本框將包含（301,40,50）。

Answer 1

你只需要將ListBox.SelectedItem轉換爲正確的類型。在VS 2010中測試C＃Express：

using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Linq; 
using System.Text; 
using System.Windows.Forms; 

namespace WindowsFormsApplication1 
{ 
    public partial class Form1 : Form 
    { 
     Dictionary<Prime_Broker, Margin2> myDictionary = new Dictionary<Prime_Broker, Margin2>(); 
     List<Prime_Broker> brokers = new List<Prime_Broker>(); 
     public Form1() 
     { 
      InitializeComponent(); 
     } 

     private void Form1_Load(object sender, EventArgs e) 
     { 
      for(Int32 i = 0; i < 5; i++) 
      { 
      Prime_Broker br = new Prime_Broker("Broker " + i.ToString(), 
               "Symbol " + i.ToString(), 
               "Address " + i.ToString()); 
      Margin2 mrg = new Margin2(i, i, i); 
      myDictionary.Add(br, mrg); 
      brokers.Add(br); 
      } 
      listBox1.DataSource = brokers; 
      listBox1.DisplayMember = "Name"; 
      listBox1.ValueMember = "Name"; 
     } 

     private void listBox1_SelectedValueChanged(object sender, EventArgs e) 
     { 
      if (listBox1.SelectedIndex > -1) 
      { 
       Prime_Broker selectedBroker = (Prime_Broker)listBox1.SelectedItem; 
       Margin2 margin; 
       if (myDictionary.TryGetValue(selectedBroker, out margin)) 
       { 
        textBox1.Text = String.Format("{0}, {1}, {2}", 
                margin.Commission, 
                margin.Maint, 
                margin.Fees); 
       } 
      } 
     } 
    } 

    public class Prime_Broker 
    { 
     public string Name { set; get; } 
     public string Symbol { set; get; } 
     public string Address { set; get; } 

     public Prime_Broker(string name, string symbol, string address) 
     { 
      this.Name = name; 
      this.Symbol = symbol; 
      this.Address = address; 
     } 
    } 

    public class Margin2 
    { 
     public Int32 Maint { set; get; } 
     public Int32 Commission { set; get; } 
     public Int32 Fees { set; get; } 

     public Margin2(Int32 maint, Int32 commission, Int32 fees) 
     { 
      this.Maint = maint; 
      this.Commission = commission; 
      this.Fees = fees; 
     } 
    } 
}