如何使用索引編號創建對象

Question

我想讓我的程序變得更短，那麼它就是現在。 我做了8個不同的對象，並與他們做事情，但我想使它像一個for循環和索引號。 有沒有辦法做到這一點，因爲我查了它，但似乎沒有發現任何東西。

對象和這樣的對象在荷蘭很抱歉。

private void AankomstButton_Click(object sender, EventArgs e) 
    { 
     if (welkKind == 1) 
     { 
      if (File.Exists(@"Bestanden/" + kind1.Naam + "_" + DateTime.Now.ToString("Y") + ".txt") == false) 
      { 
       using (StreamWriter sw = new StreamWriter(@"Bestanden/" + kind2.Naam + "_" + DateTime.Now.ToString("Y") + ".txt")) ; 

      } 
      else 
      { 
       using (StreamWriter sw = File.AppendText(@"Bestanden/" + kind2.Naam + "_" + DateTime.Now.ToString("Y") + ".txt")) 
       { 

        sw.WriteLine(DateTime.Now.ToString("d") + " Aangekomen: " + DateTime.Now.ToString("t")); 
       }     

      } 
     } 


     if (welkKind == 2) 
     { 
      if (File.Exists(@"Bestanden/" + kind2.Naam + "_" + DateTime.Now.ToString("Y") + ".txt")) 
      { 
       using (StreamWriter sw = File.AppendText(@"Bestanden/" + kind2.Naam + "_" + DateTime.Now.ToString("Y") + ".txt")) 
       { 
        sw.WriteLine(DateTime.Now.ToString("d") + " Aangekomen: " + DateTime.Now.ToString("t")); 
       } 
      } 
      else 
      { 
       using (StreamWriter sw = new StreamWriter(@"Bestanden/" + kind2.Naam + "_" + DateTime.Now.ToString("Y") + ".txt")) 
       { 
        sw.WriteLine(DateTime.Now.ToString("d") + " Aangekomen: " + DateTime.Now.ToString("t")); 
       } 
      } 
     } 
     if (welkKind == 3) 
     { 
      if (File.Exists(@"Bestanden/" + kind3.Naam + "_" + DateTime.Now.ToString("Y") + ".txt")) 
      { 
       using (StreamWriter sw = File.AppendText(@"Bestanden/" + kind3.Naam + "_" + DateTime.Now.ToString("Y") + ".txt")) 
       { 
        sw.WriteLine(DateTime.Now.ToString("d") + " Aangekomen: " + DateTime.Now.ToString("t")); 
       } 
      } 
      else 
      { 
       using (StreamWriter sw = new StreamWriter(@"Bestanden/" + kind3.Naam + "_" + DateTime.Now.ToString("Y") + ".txt")) 
       { 
        sw.WriteLine(DateTime.Now.ToString("d") + " Aangekomen: " + DateTime.Now.ToString("t")); 
       } 
      } 
     } 
     if (welkKind == 4) 
     { 
      if (File.Exists(@"Bestanden/" + kind4.Naam + "_" + DateTime.Now.ToString("Y") + ".txt")) 
      { 
       using (StreamWriter sw = File.AppendText(@"Bestanden/" + kind4.Naam + "_" + DateTime.Now.ToString("Y") + ".txt")) 
       { 
        sw.WriteLine(DateTime.Now.ToString("d") + " Aangekomen: " + DateTime.Now.ToString("t")); 
       } 
      } 
      else 
      { 
       using (StreamWriter sw = new StreamWriter(@"Bestanden/" + kind4.Naam + "_" + DateTime.Now.ToString("Y") + ".txt")) 
       { 
        sw.WriteLine(DateTime.Now.ToString("d") + " Aangekomen: " + DateTime.Now.ToString("t")); 
       } 
      } 
     } 
     if (welkKind == 5) 
     { 
      if (File.Exists(@"Bestanden/" + kind5.Naam + "_" + DateTime.Now.ToString("Y") + ".txt")) 
      { 
       using (StreamWriter sw = File.AppendText(@"Bestanden/" + kind5.Naam + "_" + DateTime.Now.ToString("Y") + ".txt")) 
       { 
        sw.WriteLine(DateTime.Now.ToString("d") + " Aangekomen: " + DateTime.Now.ToString("t")); 
       } 
      } 
      else 
      { 
       using (StreamWriter sw = new StreamWriter(@"Bestanden/" + kind5.Naam + "_" + DateTime.Now.ToString("Y") + ".txt")) 
       { 
        sw.WriteLine(DateTime.Now.ToString("d") + " Aangekomen: " + DateTime.Now.ToString("t")); 
       } 
      } 
     } 

Answer 1

如果您保留一組子數據（kind），則可以通過索引訪問數組。

Kind[] children = new Kind[] { kind1, kind2 }; 

if (welkKind >= 0 && welkKind < children.Length) 
{ 
    Kind kind = children[welkKind]; 

    string fileName = @"Bestanden/" + kind.Naam + "_" + DateTime.Now.ToString("Y") + ".txt"; 
    if (File.Exists(fileName)) 
    { 
     using (StreamWriter sw = new StreamWriter(fileName)) 
     { 
      sw.WriteLine(DateTime.Now.ToString("d") + " Aangekomen: " + DateTime.Now.ToString("t")); 
     } 
    } 
    else 
    { 
     using (StreamWriter sw = File.AppendText(fileName)) 
     { 
      sw.WriteLine(DateTime.Now.ToString("d") + " Aangekomen: " + DateTime.Now.ToString("t")); 
     } 
    } 
} 

另一種選擇將是一個清單，這將有類似的語法，它的使用，但可以動態地從列表中添加和刪除項目：

List<Kind> children = new List<Kind>(); 
children.Add(kind1); 
children.Add(kind2); 
children.Add(new Kind() { Naam = "John" }); 

if (welkKind >= 0 && welkKind < children.Count) 
{ 
    Kind kind = children[welkKind]; 
}