如何通過列表視圖細胞遍歷C＃

Question

我有與列的數目可變開始，我用插入它一個ListView和項目的數組列表如下：

for (int x = 0; x < arrayList.Count; x++) 
      { 
         ListViewItem item = new ListViewItem("IF"); 
         item.SubItems.Add("ID"); 
         item.SubItems.Add("EX"); 
         item.SubItems.Add("MEM"); 
         item.SubItems.Add("WB"); 
         for (int k = 5; k < ccNum; k++)//Set rest of row cells "" 
          item.SubItems.Add(""); 
         listView5.Items.Add(item); 
      } 

我想，隨着下一行的每一次迭代都會移至右側的x + 1個空值。但我似乎無法得到它的工作，我必須手動這是不切實際的考慮ArrayList中添加條件語句，並輸入他們也不是一成不變的：

    if (x == 1) 
        { 
         ListViewItem item = new ListViewItem("IF"); 
         item.SubItems.Add("ID"); 
         item.SubItems.Add("EX"); 
         item.SubItems.Add("MEM"); 
         item.SubItems.Add("WB"); 
         for (int k = 5; k < ccNum; k++) 
          item.SubItems.Add(""); 
         listView5.Items.Add(item); 
        } 
        else if(x==2) 
        { 
         ListViewItem item = new ListViewItem(""); 
         item.SubItems.Add("IF"); 
         item.SubItems.Add("ID"); 
         item.SubItems.Add("EX"); 
         item.SubItems.Add("MEM"); 
         item.SubItems.Add("WB"); 
         for (int k = 5; k < ccNum; k++) 
          item.SubItems.Add(""); 
         listView5.Items.Add(item); 
        } 
        else if(x==3) 
        { 
         ListViewItem item = new ListViewItem(""); 
         item.SubItems.Add(""); 
         item.SubItems.Add("IF"); 
         item.SubItems.Add("ID"); 
         item.SubItems.Add("EX"); 
         item.SubItems.Add("MEM"); 
         item.SubItems.Add("WB"); 
         for (int k = 5; k < ccNum; k++) 
          item.SubItems.Add(""); 
         listView5.Items.Add(item); 
        } ..etc 

如果我嘗試訪問的下一行單元格，並設置它像下面這樣：

ListViewItem item = new ListViewItem("IF"); 
         item.SubItems.Add("ID"); 
         item.SubItems.Add("EX"); 
         item.SubItems.Add("MEM"); 
         item.SubItems.Add("WB"); 
         for (int k = 5; k < ccNum; k++) 
          item.SubItems.Add(""); 
         listView5.Items.Add(item); 

         listView5.Items[x + 1].SubItems[x].Text = ""; 

我得到一個運行時錯誤：

InvalidArgument=Value of '2' is not valid for 'index'.

是否與ListView控件或與此有關的任何其他方法來實現它更簡單的方法？

Answer 1

如果我理解正確的話，你可以用另一個循環，增加了空分項目實現這一點：

for (int x = 0; x < arrayList.Count; x++) 
{ 
    //if x is 0 it's the first iteration so we want "IF"; otherwise we want "" 
    ListViewItem item = new ListViewItem(x == 0 ? "IF" : ""); 
    //add the rest of the empty sub-elements with a loop 
    for (int y = 1; y < x; y++) 
    { 
     item.SubItems.Add(""); 
    } 
    item.SubItems.Add("ID"); 
    item.SubItems.Add("EX"); 
    item.SubItems.Add("MEM"); 
    item.SubItems.Add("WB"); 
    for (int k = 5; k < ccNum; k++)//Set rest of row cells "" 
     item.SubItems.Add(""); 
    listView5.Items.Add(item); 
} 

Answer 2

您正遇到一個非常常見的數組邊界問題。讓我告訴你一個代碼示例，以幫助...

static void Main(string[] args) 
    { 
     var tempList = new List<string>(); 
     tempList.Add("1"); 
     tempList.Add("2"); 
     int x; 
     for (x = 0; x < tempList.Count; x++) 
     { 
      //do something here 
     } 

     //value of x after loop 
     Console.WriteLine(x); 
     //the value of x is 2. 

     try 
     { 
      Console.WriteLine(tempList[x]); //lets try to read the value here 
     }catch(Exception e){ 
      Console.WriteLine("nope, not happening"); 
     } 

     //to drive this point further home... let me show you what you did... 
     tempList.Add("random"); 
     try 
     { 
      Console.WriteLine(tempList[x+1]); //lets try to read the value here after we added an element 
     } 
     catch (Exception e) 
     { 
      Console.WriteLine("nope, not happening"); 
     } 
     Console.ReadLine(); 
    }