StreamWriter 不会写入日志文件 [英] StreamWriter won't write to log file

问题描述

如果output.txt"尚不存在，此代码将在 C:\temp 中创建output.txt".但是， log.WriteLine(); 对我不起作用.当我打开文件时，我看不到它.这是为什么?

This code will create "output.txt" in C:\temp if it doesn't already exist. However, log.WriteLine(); doesn't work for me. When I open the file, I don't see it. Why is this?

private static string LogFile = @"C:\Temp\output.txt";
private StreamWriter log;
if (!File.Exists(@"" + LogFile))
{
    log = new StreamWriter(@"" + LogFile);
}
else {
    log = File.AppendText(@"" + LogFile);
}
log.WriteLine("["+DateTime.Now + "]: ");

推荐答案

您需要关闭 StreamWriter.最好为此使用 using 块，因为它保证 StreamWriter 将被关闭，即使抛出异常.

You need to close the StreamWriter. It's best to use a using block for this, as it guarantees that the StreamWriter will be closed, even if an exception is thrown.

using (var log = GetLog()){
    log.WriteLine("["+DateTime.Now + "]: ");
}

...

public StreamWriter GetLog(){
    if (!File.Exists(@"" + LogFile))
    {
        return new StreamWriter(@"" + LogFile);
    }
    else {
        return File.AppendText(@"" + LogFile);
    }
}

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