獲取錯誤「INDEX WAS OUT OF BOUNDS」，同時檢索複選框以檢查從sql選擇的值到c＃

Question

我已將複選框的選中值插入到表中，方法是將它們拆分爲不同的列，與我想要檢索的相同從表中的值來簽入複選框它是通過錯誤

「索引出界」

的代碼就低於

foreach (DataRow Recpt in ds.Tables[5].Rows) 
{ 

     for (var i = 0; i <= chkPrdRecipients.Items.Count-1; i++) 
     { 

      var Recipients = Recpt["RecipientId"].ToString(); 
      Array arrRecipients = Recipients.Split(','); 

      for (var j = 0; j <= Recipients.Length - 1; j++) 
      { 
       if (arrRecipients.GetValue(j).ToString().Trim().ToLower() == 
        chkPrdRecipients.Items[i].Value.Trim().ToLower()) 
       { 
        chkPrdRecipients.Items[i].Selected = true; 
       } 
      } 
     } 
} 

請找到一個解決辦法....

Answer 1

的問題是，你正在使用的，而不是數組的長度串爲上限的j長度。你會擺脫使用這種即時錯誤的：

for (int j = 0; j < arrRecipient.Length; j++) 

但是，代碼仍然是十分可怕的 - 你爲什麼要使用Array代替string[]？代碼將會更簡單。我也會重命名變量以遵循常規慣例。例如：

foreach (DataRow recipientRow in ds.Tables[5].Rows) 
{ 
    // We don't need to fetch this multiple times, or trim them each time. 
    string[] recipients = ((string) recipientRow["RecipientId"]) 
     .Split(',') 
     .Select(x => x.Trim()) 
     .ToArray(); 

    // It's possible that you could use a foreach loop here, but 
    // we don't know the type of chkPrdRecipients... 
    for (int i = 0; i < chkPrdRecipients.Items.Count; i++) 
    { 
     var item = chkPrdRecipients.Items[i]; 
     foreach (var recipient in recipients) 
     { 
      if (recipient.Equals(item.Value.Trim(), 
           StringComparison.InvariantCultureIgnoreCase)) 
      { 
       item.Selected = true; 
       break; // No need to check the rest of the recipients 
      } 
     } 
    } 
}