Question

basicLog是名称和时间戳列表。我想把它们写到一个文件中。我得到的两个错误是';'在StreamWriter行和'file'上。在第二行。

';'错误是：可能错误的空语句文件错误是：当前上下文中不存在名称“file”。

文件创建得很好，但没有任何内容写入。我对当前上下文中不存在的文件感到困惑，因为在创建之前的行上。谢谢你的帮助。

foreach (BasicLog basicLog in emailAttach)
{
    using (System.IO.StreamWriter file = new System.IO.StreamWriter(@"C:\\sorted.txt", true));
    file.WriteLine(basicLog.LastName + " - " + basicLog.InOrOut + " - " + basicLog.EventTime + "\n");
}

Answer 1

是的，你确实有一个错误的空声明。

删除';'并缩进以显示原因：

foreach (BasicLog basicLog in emailAttach)
{
   using (System.IO.StreamWriter file = 
            new System.IO.StreamWriter(@"C:\\sorted.txt", true))  //;
   {
      file.WriteLine(basicLog.LastName + " - " + basicLog.InOrOut + " - "
             + basicLog.EventTime + "\n");
   }
}

WriteLine（）语句（应该）在using（）的控制之下。 {}使更清楚。

这会有效，但请注意，效率非常低，您要多次重新打开文件（for append）。

因此最好反转foreach / using：

using (System.IO.StreamWriter file = 
      new System.IO.StreamWriter(@"C:\\sorted.txt", true)) 
{
   foreach (BasicLog basicLog in emailAttach)
   {
        file.WriteLine(basicLog.LastName + " - " + basicLog.InOrOut + " - " 
            + basicLog.EventTime + "\n");
   }
}

Answer 2

Ooops在使用行的末尾有一个分号???

也许你的意图是：

using (System.IO.StreamWriter file = new System.IO.StreamWriter(@"C:\\sorted.txt", true))
{
    foreach (BasicLog basicLog in emailAttach) 
    {          
        file.WriteLine(basicLog.LastName + " - " + basicLog.InOrOut + " - " + basicLog.EventTime + "\n"); 
    } 
}

好奇，今天早上发生了同样的事情： - ）

Answer 3

您的file实例将在此行之后立即处理（因为您正在使用using）：

using (System.IO.StreamWriter file = new System.IO.StreamWriter(@"C:\\sorted.txt", true));

将其更改为

System.IO.StreamWriter file = new System.IO.StreamWriter(@"C:\\sorted.txt", true);

或完整代码，

System.IO.StreamWriter file;
foreach (BasicLog basicLog in emailAttach)
{
    file = new System.IO.StreamWriter(@"C:\\sorted.txt", true);
    file.WriteLine(basicLog.LastName + " - " + basicLog.InOrOut + " - " + basicLog.EventTime + "\n");
}

或正确使用using

foreach (BasicLog basicLog in emailAttach)
{
    using(System.IO.StreamWriter file = new System.IO.StreamWriter(@"C:\\sorted.txt", true))
    {
        file.WriteLine(basicLog.LastName + " - " + basicLog.InOrOut + " - " + basicLog.EventTime + "\n");
    }
}

Answer 4

在写入文件之前，您正在处理StreamWriter。重构：

using (System.IO.StreamWriter file = new System.IO.StreamWriter(@"C:\\sorted.txt", true))   
{
   foreach (BasicLog basicLog in emailAttach)
   {     
      file.WriteLine(basicLog.LastName + " - " + basicLog.InOrOut + " - " + basicLog.EventTime + "\n");
   }
}

C＃StreamWriter没有写入文件

4 个答案: