C＃如何將字符串轉換爲類的實例？

Question

在我的節目，我有一個類示蹤：

using System; 
    using System.Collections.Generic; 
    using System.Linq; 
    using System.Text; 

    namespace Tracepak_Heat_Loss_Program 
    { 
     class Tracer 
     { 
      public string family; 
      public string model; 
      public string type; 
      public int output; 
      public int voltage; 
      public int maxMaintain; 
      public int maxIntermittent; 
      public string tRating; 
      public string approvals; 
      public string code; 

      public Tracer(string f, string m, string t, int o, int v, int mM, int mI,string tR, string a, string c) 
      {    
       family = f; 
       model = m; 
       type = t; 
       output = o; 
       voltage = v; 
       maxMaintain = mM; 
       maxIntermittent = mI; 
       tRating = tR; 
       approvals = a; 
       code = c; 
      } 
     }  
    } 

在我的主要形式，我已經創建了幾個示蹤劑的實例：

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 Tracepak_Heat_Loss_Program 
    { 
     public partial class mainForm : Form 
     { 
      public mainForm() 
      { 
       InitializeComponent(); 
      } 

      private void mainForm_Load(object sender, EventArgs e) 
      { 
      } 


      Tracer J3 = new Tracer("Raychem BTV", "3BTV1-CT", "Self-Reg", 3, 120, 150, 185, "T6", "FM/CSA/ATEX", "J3"); 
      Tracer J5 = new Tracer("Raychem BTV", "5BTV1-CT", "Self-Reg", 5, 120, 150, 185, "T6", "FM/CSA/ATEX", "J5"); 
      Tracer J8 = new Tracer("Raychem BTV", "8BTV1-CT", "Self-Reg", 8, 120, 150, 185, "T6", "FM/CSA/ATEX", "J8"); 
      Tracer J10 = new Tracer("Raychem BTV", "10BTV1-CT", "Self-Reg", 10, 120, 150, 185, "T6", "FM/CSA/ATEX", "J10"); 

我有我的主要形式的方法，它返回示蹤名從列表框

public string GetTracer() 
    { 
     String s = tracerListBox.Text; 
     int index = s.IndexOf(" "); 
     return index >= 0 ? s.Substring(0, index): s; 
    } 
    // This could yield "J3" for example 

我想能夠使用GetTracer（）的結果來檢索該跟蹤器的屬性。

例如：

我可以打電話給

J3.family; 

    // The result of which is "Raychem BTV" 

我想要做的是使用

GetTracer().family; 

，並使其返回與示蹤劑有關的財產，我的方法GetTracer回報。

這可能嗎？預先感謝您的幫助。我對編程非常陌生，儘管我試圖通過使用類來使代碼更加健壯，但事實證明，這比我想象的要困難得多。

Answer 1

無需本地變量iables J3,J5,J8等等的數據結構。 只是ToString方法列表框添加到您的示蹤類

public override string ToString() 
{ 
    return code; 
} 

，並添加您的示蹤物如下

listBox.Items.Add(new Tracer("Raychem BTV", "3BTV1-CT", "Self-Reg", 3, 120, 150, 185, "T6", "FM/CSA/ATEX", "J3")); 
listBox.Items.Add(new Tracer("Raychem BTV", "5BTV1-CT", "Self-Reg", 5, 120, 150, 185, "T6", "FM/CSA/ATEX", "J5")); 
listBox.Items.Add(new Tracer("Raychem BTV", "8BTV1-CT", "Self-Reg", 8, 120, 150, 185, "T6", "FM/CSA/ATEX", "J8")); 
listBox.Items.Add(new Tracer("Raychem BTV", "10BTV1-CT", "Self-Reg", 10, 120, 150, 185, "T6", "FM/CSA/ATEX", "J10")); 

這樣一來，你會看到code在你的列表框。

在一些ListBox的事件，你可以得到示蹤對象

void listBox_SelectedIndexChanged(object sender, EventArgs e) 
{ 
    Tracer tracer = ((ListBox)sender).SelectedItem as Tracer; 
    MessageBox.Show(tracer.family); 
} 

Answer 2

你不能這樣做GetTracer().Name除非GetTracer返回一個Tracer對象。

如果你想找到這取決於它示蹤劑是你應該思考一些字典存儲在它那示蹤名稱代碼：

Dictionary<string, Tracer> dict = new Dictionary<string, Tracer>; 

，並插入提法，每個創建示蹤劑有：

Tracer J3 = new Tracer("Raychem BTV", "3BTV1-CT", "Self-Reg", 3, 120, 150, 185, "T6", "FM/CSA/ATEX", "J3"); 
dict.Add("J3", J3); 

後，你可以很容易地做到這一點：

string name = GetTracer(); 
if(dict.ContainsKey(name)) 
{ 
    Tracer item = dict[name]; 
    string family = item.family; 
}