Question

我有一个文本文件，应该有100行。每行由id（001,002,003等）标识。但有时一些线路会错过。例如：某些文本文件可能只有93行。我正在检查缺失的行。

这是我的代码。

bool[] idCheck = new bool[100];
for (int i = 0; i < 100; i++)
{
   idCheck[i] = false;
   for (int j = 0; j < FileIdArray.Length; j++) //FileIdArray is the list of all my Ids.
   {
        if (i == Convert.ToInt32(FileIdArray[j]))
        {
          idCheck[i] = true;
        }
   }
}
ResultBuilder.AppendLine(String.Format("*****************************************"));
for (int i = 0; i < idCheck.Length; i++)
{
   idCheck[0] = true;          
   if (idCheck[i] == false)
   {
      ResultBuilder.AppendLine(String.Format("Missing Id's from File 1 are {0}", i));
   }                                    
}

我的o / p看起来像这样：

*****************************************
Missing Id's from File 1 are 26
Missing Id's from File 1 are 41
Missing Id's from File 1 are 56
Missing Id's from File 1 are 88
Missing Id's from File 1 are 94
Missing Id's from File 1 are 98
Missing Id's from File 1 are 99

我喜欢我的o / p看起来像这样：

Missing Id's from File 1 are 26,41,56,88,94,98,99.

我意识到我将ResultBuilder置于循环中，因此我重复了。但是当我尝试将i保存到字符串时，我得到了一个异常。

Answer 1

您可以用以下内容替换底部循环：

var missing = idCheck.Select((b, idx) => new { IsPresent = b, Idx = idx })
    .Where(p => !p.IsPresent)
    .Select(p => p.Idx);

string message = string.Format("Missing ids from File 1 are {0}", string.Join("," missing));
ResetBuilder.Apppend(message);

Answer 2

尝试以下代码，这将保存您的第二个循环。在第一个循环中，您将获得缺少的条目。

for (int i = 0; i < 100; i++)
{
   idCheck[i] = false;
   for (int j = 0; j < FileIdArray.Length; j++) //FileIdArray is the list of all my Ids.
   {
        if (i == Convert.ToInt32(FileIdArray[j]))
        {
          idCheck[i] = true;          
          break;
        }       
   }
   if(j>=100)
    ResultBuilder.AppendLine(String.Format("Missing Id's from File 1 are {0}", i));
}

Answer 3

更新您的代码：

ResultBuilder.AppendLine(String.Format("Missing Id's from File 1 are:" )

for (int i = 0; i < idCheck.Length; i++)
 {
   idCheck[0] = true;

   if (idCheck[i] == false)
    {
      ResultBuilder.Append(String.Format("{0}", i));
    }
}

Answer 4

只需在for循环中使用以下行： -

    ResetBuilder.Append(String.Format("Missing Id's from File 1 are {0}", i)) ;

从数组c＃打印值

4 个答案: