blocks|key|574902|text|改用下面的代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|574903|new+StreamWriter("c:\\file.txt",+true);|code-block|syntax|javascript|574904|使用StreamWriter构造函数的这个重载，您可以选择是追加文件还是覆盖文件。|574905|C#+4及更高版本提供了以下语法，有些人认为这些语法更具可读性：|574906|new+StreamWriter("c:\\file.txt",+append:+true);|574907|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|S|8|@]|9|@]|A|$E|F]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Use this instead:

<pre><code>new StreamWriter("c:\\file.txt", true);
</code></pre>

With this overload of the StreamWriter constructor you choose if you append the file, or overwrite it. 

C# 4 and above offers the following syntax, which some find more readable:

<pre><code>new StreamWriter("c:\\file.txt", append: true);
</code></pre>

blocks|key|574961|text|替换为：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|574962|StreamWriter+file2+=+new+StreamWriter("c:/file.txt");|code-block|syntax|javascript|574963|有了这个：|574964|StreamWriter+file2+=+new+StreamWriter("c:/file.txt",+true);|574965|true指示它附加文本。|offset|length|style|CODE|574966|entityMap^0|0|0|0|0|0|4|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|W|8|@$M|X|N|Y|O|P]]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

Replace this: 

<pre><code>StreamWriter file2 = new StreamWriter("c:/file.txt");
</code></pre>

with this:

<pre><code>StreamWriter file2 = new StreamWriter("c:/file.txt", true);
</code></pre>

<code>true</code> indicates that it appends text.

blocks|key|574998|text|+using+(FileStream+fs+=+new+FileStream(fileName,FileMode.Append,+FileAccess.Write))
+using+(StreamWriter+sw+=+new+StreamWriter(fs))
+{
++++sw.WriteLine(something);
+}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|574999|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code> using (FileStream fs = new FileStream(fileName,FileMode.Append, FileAccess.Write))
 using (StreamWriter sw = new StreamWriter(fs))
 {
 sw.WriteLine(something);
 }
</code></pre>

blocks|key|575050|text|使用带有第二个参数-+true的this+StreamWriter+constructor。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|575051|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/36b035cb.aspx^0|B|4|L|C|G|T|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]|$9|Q|A|R|B|C]]|D|@$9|S|A|T|1|U]]|E|$]]|$1|F|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

Use <a href="http://msdn.microsoft.com/en-us/library/36b035cb.aspx" rel="nofollow">this <code>StreamWriter</code> constructor</a> with 2nd parameter - <code>true</code>.

blocks|key|791291|text|试试这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|791292|StreamWriter+file2+=+new+StreamWriter(@"c:\file.txt",+true);
file2.WriteLine(someString);
file2.Close();|code-block|syntax|javascript|791293|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Try this:

<pre><code>StreamWriter file2 = new StreamWriter(@"c:\file.txt", true);
file2.WriteLine(someString);
file2.Close();
</code></pre>

blocks|key|791361|text|另一种选择是使用System.IO.File.AppendText|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|791362|这等同于其他人给出的StreamWriter重载。|791363|此外，File.AppendAllText可以提供一个稍微更简单的接口，而不必担心打开和关闭流。不过，您可能需要考虑如何添加自己的换行符。:)|791364|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/system.io.file.appendtext.aspx|1|http://msdn.microsoft.com/en-us/library/ms143356.aspx^0|8|P|0|0|0|3|I|1|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@$A|S|B|T|1|U]]|C|$]]|$1|D|3|E|5|6|7|V|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]]|C|$]]|$1|H|3|-4|5|6|7|10|8|@]|9|@]|C|$]]]|I|$J|$5|K|L|M|C|$N|O]]|P|$5|K|L|M|C|$N|Q]]]]

Another option is using <a href="http://msdn.microsoft.com/en-us/library/system.io.file.appendtext.aspx" rel="nofollow">System.IO.File.AppendText</a>

This is equivalent to the StreamWriter overloads others have given.

Also <a href="http://msdn.microsoft.com/en-us/library/ms143356.aspx" rel="nofollow">File.AppendAllText</a> may give a slightly easier interface without having to worry about opening and closing the stream. Though you may need to then worry about putting in your own linebreaks. :)

blocks|key|575174|text|替换此行：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|575175|StreamWriter+sw+=+new+StreamWriter("c:/file.txt");|code-block|syntax|javascript|575176|使用以下代码：|575177|StreamWriter+sw+=+File.AppendText("c:/file.txt");|575178|然后将您的代码行写入文本文件，如下所示：|575179|sw.WriteLine("text+content");|575180|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

Replace this line:

<pre><code>StreamWriter sw = new StreamWriter("c:/file.txt");
</code></pre>

with this code:

<pre><code>StreamWriter sw = File.AppendText("c:/file.txt");
</code></pre>

and then write your line to the text file like this:

<pre><code>sw.WriteLine("text content");
</code></pre>

blocks|key|575216|text|一种更简单的方法是使用File.AppendText，它将UTF8编码的文本附加到现有文件，如果指定的文件不存在，则附加到新文件，并返回System.IO.StreamWriter|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|575217|using+(System.IO.StreamWriter+sw+=+System.IO.File.AppendText(logFilePath+%2B+"log.txt"))
{++++++++++++++++++++++++++++++++++++++++++++++++
++++sw.WriteLine("this+is+a+log");
}|code-block|syntax|javascript|575218|entityMap^0|B|F|1W|M|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

One more simple way is using the <code>File.AppendText</code> it appends UTF-8 encoded text to an existing file, or to a new file if the specified file does not exist and returns a <code>System.IO.StreamWriter</code>

<pre><code>using (System.IO.StreamWriter sw = System.IO.File.AppendText(logFilePath + "log.txt"))
{ 
 sw.WriteLine("this is a log");
}
</code></pre>

blocks|key|575228|text|您可以像这样使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|575229|+using+(System.IO.StreamWriter+file+=new+System.IO.StreamWriter(FilePath,true))
+++++++++++++{
++++++++++++++++++++
++++++++++++++++++++
++++++++++++`file.Write("SOme+Text+TO+Write"+%2B+Environment.NewLine);+++++++++
++++++++++++++++++++
+++++++++++++}|code-block|syntax|javascript|575230|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can use like this
<pre><code> using (System.IO.StreamWriter file =new System.IO.StreamWriter(FilePath,true))
 {
 
 
 `file.Write(&quot;SOme Text TO Write&quot; + Environment.NewLine); 
 
 }
 
</code></pre>

I want to append lines to my file. I am using a StreamWriter:

<pre><code>StreamWriter file2 = new StreamWriter(@"c:\file.txt");
file2.WriteLine(someString);
file2.Close();
</code></pre>

The output of my file should be several strings below each other, but I have only one row, which is overwritten every time I run this code.

Is there some way to let the StreamWriter append to an existing file?

Append lines to a file using a StreamWriter

我想将行附加到我的文件中。我使用的是StreamWriter：StreamWriter file2 = new StreamWriter(@"c:\file.txt");file2.WriteLine(someString);file2.Close();我的文件的输出应该是彼此下面的几个字符串，但我只有一行，每次我运行...

问使用StreamWriter将行追加到文件中
EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问使用StreamWriter将行追加到文件中EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问使用StreamWriter将行追加到文件中
EN