Add（）方法中的If語句？

Question

我試圖將文本文件的每一行添加到listView中的不同列中。但是，我遇到了一個問題。

這是我做了一個方法：

public void OpenFile() 
     { 
      OpenFileDialog openFileDialog = new OpenFileDialog(); 
      openFileDialog.Filter = "Text files (*.txt)|*.txt|All files (*.*)|*.*"; 
      string line = ""; 
      int index = 0; 
      if (openFileDialog.ShowDialog() == true) 
      using (StreamReader sr = File.OpenText(openFileDialog.FileName)) 
      { 
       while ((line = sr.ReadLine()) != null) 
       { 
        index++; 
        if (index == 1) 
         InvoiceNumbertxt.Text = line; 
        else if (index == 2) 
         InvoiceDatetxt.Text = line; 
        else if (index == 3) 
         DueDatetxt.Text = line; 
        else if (index == 4 || index == 5 || index == 6 || index == 7 || index == 8 || index == 9) 
         PersonInfolst.Items.Add(line); 
        else if (index == 10) 
        { 
         Items.Add(new ItemProperties 
         {  
          Item = line 
          if(index == 11)// <---- If-statement inside Add? 
          Description = line; 


         }); 
         itemlst.ItemsSource = Items; 
        } 
        else 
         break; 
       } 
      } 
     } 

正如你所看到的索引僅僅是一個方便的標誌（變量）來插入，以線條和多行不重疊到相同的控制。

問題我已經是我要檢查，如果指數是內部的Add（）方法的值，這樣我可以在新的文本文件行添加到列表中的同一行，但不同的列。

UPDATE：

public partial class MainWindow : Window 
    { 
     ObservableCollection<ItemProperties> Items = 
     new ObservableCollection<ItemProperties>(); 
     public MainWindow() 
     { 
      InitializeComponent(); 
     } 
     public ObservableCollection<ItemProperties> GameCollection 
     { 
      get 
      { 
       if (Items == null) 
       { 
        Items = new ObservableCollection<ItemProperties>(); 
       } 
       return Items; 
      } 
     } 

     private void btnOpenFile_Click(object sender, RoutedEventArgs e) 
     { 
      OpenFile(); 
     } 

     public void OpenFile() 
     { 
      OpenFileDialog openFileDialog = new OpenFileDialog(); 
      openFileDialog.Filter = "Text files (*.txt)|*.txt|All files (*.*)|*.*"; 
      string line = ""; 
      int index = 0; 
      if (openFileDialog.ShowDialog() == true) 
      using (StreamReader sr = File.OpenText(openFileDialog.FileName)) 
      { 
       while ((line = sr.ReadLine()) != null) 
       { 
        index++; 
        if (index == 1) 
         InvoiceNumbertxt.Text = line; 
        else if (index == 2) 
         InvoiceDatetxt.Text = line; 
        else if (index == 3) 
         DueDatetxt.Text = line; 
        else if (index == 4 || index == 5 || index == 6 || index == 7 || index == 8 || index == 9) 
         PersonInfolst.Items.Add(line); 
        else if (index == 10) 
        { 
         Items.Add(new ItemProperties { Item = line }); 
         itemlst.ItemsSource = Items; 
        } 
        else if (index == 11) 
        { 
         //?? 

        } 
        else 
         break; 
       } 
      } 
     } 

     private void btnOpenImage_Click(object sender, System.Windows.RoutedEventArgs e) 
     { 
      Microsoft.Win32.OpenFileDialog openfile = new Microsoft.Win32.OpenFileDialog(); 
      openfile.DefaultExt = "*.jpg"; 
      openfile.Filter = "Image Files|*.jpg"; 
      Nullable<bool> result = openfile.ShowDialog(); 
      if (result == true) 
      { 
       imagefile.Source = new BitmapImage(new Uri(openfile.FileName)); 
      } 
     } 

     public class ItemProperties 
     { 
      public string Item { get; set; } 
      public string Description { get; set; } 
      public string Quantity { get; set; } 
      public string UnitPrice { get; set; } 
      public string Tax { get; set; } 
     } 
    } 

Answer 1

您可以使用三元運算來

Description = (index == 11) ? line : ""; 

Answer 2

首先執行一個內嵌條件檢查和設置的值，你應該考慮使用switch，因爲它看起來的在這種情況下的理想用途。多個ifs對於您的需求並不是很好。

其次，你可以在指定的值，有的像這樣用簡單的三元運算符：

Description = id == 11 ? line : null; 

Answer 3

你正在做它在不添加（） - 方法，但裏面的ItemProperties對象初始化的。這是不可能的！

最好的解決方法是編寫一個額外的Add方法，並在那裏創建新的ItemProperties對象。

private MyAdd(string line, int index) 
{ 
    if(index == 11) 
     Items.Add(new ItemProperties {Item = line, Description = "line11"}); 
    else 
     Items.Add(new ItemProperties {Item = line, Description = "other"}); 
} 

然後

else if (index == 10) 
{ 
    MyAdd(line, index); 
    itemlst.ItemsSource = Items; 
} 

Answer 4

else if (index == 10) 
{ 
    Items.Add(new ItemProperties{Item = line}); 
    itemlst.ItemsSource = Items; 
} 
else if (index == 11) 
{ 
    Description = line; 
} 

忘記環路

InvoiceNumbertxt.Text = sr.ReadLine(); 
InvoiceDatetxt.Text = sr.ReadLine(); 
... 
Items.Add(new ItemProperties 
         {  
          Item = sr.ReadLine(); 
          Description = sr.ReadLine(); 
         });