blocks|key|564858|text|不没有数据库。在这些说明中，需要附加到现有文件的record+==+some+selected+item。只需使用流和编写器将文件保存到磁盘，就可以满足要求。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|564859|entityMap^0|O|6|Y|I|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

No, no database. In these instructions, <code>record</code> == <code>some selected item</code> that needs to be appended to an existing file. Just use a stream and a writer to save the file to disk and you satisfy the requirement.

blocks|key|664659|text|没有没有数据库。您所做的就是与Windows文件系统交互(例如，硬盘上的文件)。使用System.IO命名空间中的类加载和保存文件。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|664660|“绝对路径”是指以根表达式表示的驱动器中文件的唯一位置；“相对路径”是指向相对于给定位置的文件的部分路径：|664661|c:\foo\bar\baz\my+files\homework.txt
..\..\homework.txt|code-block|syntax|javascript|664662|这些都是绝对和相对的路径。|664663|我不知道您在这里需要多少细节，很难全面概述文件系统的工作方式。您可能想看看MSDN中处理文件管理的基本示例。|664664|entityMap^0|16|9|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|V|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|W|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|X|8|@]|D|@]|E|$]]|$1|O|3|P|5|6|7|Y|8|@]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|R|$]]

No, there is no database. What you do is interact with the Windows file system (eg, the files on your hard drive). You use the classes in the <code>System.IO</code> namespace to load and save files. 

'Absolute path' refers to the unique location of a file in the drive expressed as a rooted expression; a 'relative path' is a partial path that points to a file relative to a given location:

<pre><code>c:\foo\bar\baz\my files\homework.txt
..\..\homework.txt
</code></pre>

Those are an absolute and relative paths.

I'm not sure how much detail you are looking for here, it's hard to give a complete overview of the way filesystems work. You might want to look at the basic examples in MSDN that deal with file management.

blocks|key|664689|text|首先，读一读如何读写文件。我发现了一个很好的链接：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|664690|看看这个|offset|length|664691|接下来，您要做的是将读/写代码放在每个按钮的Button_Click事件中(假设使用Visual，双击按钮可自动创建此事件)。|664692|通过访问文本框的.text()属性，可以轻松地从文本框中检索路径|664693|string+path+=+myTextBox.Text;|code-block|syntax|javascript|664694|我已经有一段时间没有用c#编写任何代码了，但是这是非常基本的，我认为它应该会有所帮助。|664695|entityMap|0|LINK|mutability|MUTABLE|url|http://www.csharp-station.com/HowTo/ReadWriteTextFile.aspx^0|0|0|4|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@]|9|@$D|10|E|11|1|12]]|A|$]]|$1|F|3|G|5|6|7|13|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|14|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|15|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|16|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]]]

First of all read up on how to read and write files. Here's a good link I found:

<a href="http://www.csharp-station.com/HowTo/ReadWriteTextFile.aspx" rel="nofollow">check it out</a>

Next what you'll want to do is put your read/write code in the Button_Click event of each button (double click on your buttons to auto create this event assuming your using Visual Studio)

You can easily retrieve the path from your text box by accessing the .text() property of your textbox

<pre><code>string path = myTextBox.Text;
</code></pre>

It's been a while since I've coded anything in c# but this is pretty basic and I think it should help.

blocks|key|1144189|text|这个问题很难详细分析，因为它是一个相当广泛的话题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1144190|对于文件交互，您必须使用System.IO命名空间，它具有易于加载和保存文件的类。|1144191|http://msdn.microsoft.com/en-us/library/system.io.aspx|offset|length|1144192|上面的链接是MSDN上关于如何使用System.IO开始文件管理的一个很好的参考。|1144193|祝好运!|1144194|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|1I|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|U|8|@]|9|@$F|V|G|W|1|X]]|A|$]]|$1|H|3|I|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|Z|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|E]]]]

It's hard to give a detailed analysis of this subject as it is quite a wide topic.

For file interaction you must use the System.IO namespace which has classes to easily load and save files.

<a href="http://msdn.microsoft.com/en-us/library/system.io.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/system.io.aspx</a>

The link above is a good reference on MSDN on how you can get started with File Management using System.IO.

Good luck!

blocks|key|564896|text|如果我对你的理解是正确的，你的问题是你是否需要在保存之前第二次阅读这个文件，如果你创建了一个新的文件，你需要以其他方式对待它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|564897|我会说“不”。您已经将文件的内容读入列表框。您只需从列表框中获取编辑过的内容(当用户完成此操作时)并将其保存到文件中(覆盖任何内容)。|564898|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

If I understand you correctly, your question is wether or not you need to read the file a second time before saving or otherwise treat if differently than if you created a new file.

I would say "no". You have already read the content of the file into the listbox. You just need to get the edited content from the listbox (when the user is done with it) and save it to the file (overwriting whatever is there).

blocks|key|564918|text|负载的：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|564919|读文件逐行|ordered-list-item|564920|添加到ListBox项的每一行|564921|For+Save:|564922|打开保存文件而不截断(附加到文件中)|564923|对于每个项中的ListBox项，将其写入保存文件|564924|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/94223t4d.aspx|1|http://msdn.microsoft.com/en-us/library/system.windows.forms.listbox.objectcollection.add.aspx|2|http://msdn.microsoft.com/en-us/library/3zc0w663.aspx|3|http://msdn.microsoft.com/en-us/library/ttw7t8t6%2528v=VS.80%2529.aspx^0|3|1|0|0|3|0|0|0|2|1|0|0|9|0|0|2|2|0|0|4|3|0^^$0|@$1|2|3|4|5|6|7|14|8|@$9|15|A|16|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|17|8|@]|D|@$9|18|A|19|1|1A]]|E|$]]|$1|I|3|J|5|H|7|1B|8|@]|D|@$9|1C|A|1D|1|1E]]|E|$]]|$1|K|3|L|5|6|7|1F|8|@$9|1G|A|1H|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|1I|8|@]|D|@$9|1J|A|1K|1|1L]]|E|$]]|$1|O|3|P|5|H|7|1M|8|@]|D|@$9|1N|A|1O|1|1P]]|E|$]]|$1|Q|3|-4|5|6|7|1Q|8|@]|D|@]|E|$]]]|R|$S|$5|T|U|V|E|$W|X]]|Y|$5|T|U|V|E|$W|Z]]|10|$5|T|U|V|E|$W|11]]|12|$5|T|U|V|E|$W|13]]]]

For Load:

<ol>
<li><a href="http://msdn.microsoft.com/en-us/library/94223t4d.aspx" rel="nofollow">Read the file</a> line by line</li>
<li><a href="http://msdn.microsoft.com/en-us/library/system.windows.forms.listbox.objectcollection.add.aspx" rel="nofollow">Add</a> each line to the ListBox Items</li>
</ol>

For Save:

<ol>
<li><a href="http://msdn.microsoft.com/en-us/library/3zc0w663.aspx" rel="nofollow">Open</a> your save file without truncating (ie append to the file)</li>
<li><a href="http://msdn.microsoft.com/en-us/library/ttw7t8t6%28v=VS.80%29.aspx" rel="nofollow">For each</a> item in your ListBox Items, write it to the save file</li>
</ol>

I have a few questions. Yes this is homework and I am just trying to understand it.

This is what is being asked.

<blockquote>
 • When the button “Load” is clicked, read the file specified in the textbox (txtFilePath: Absolute path not relative) and add the objects found within to the listbox
 
 • When the user clicks the “Save” button, write the selected record to the file specified in txtFilePath (absolute path not relative) without truncating the values currently inside
</blockquote>

Can someone please explain to me as I am still learning this. I have the button and the textbox there and the same with the save. Now with the save button will I just have the same code as you would if you just wanted to save it. But from what I am gathering there is a database so you can load the file that you saved. Or am I making this harder than what it is?

Reading and writing to files

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我有几个问题。是的，这是家庭作业，我只是想理解它。这就是我们要问的问题。·单击按钮“Load”时，读取文本框中指定的文件(txtFilePath:绝对路径而不是相对路径)，并将列表框中找到的对象添加到列表框中·当用户单击“保存”按钮时，将选定的记录写入txtFilePath中指定的文件(绝对路径不是相对的)，而不截断当...

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