如何使用c＃..写入特定位置的空文件？ [英] How to write into a empty file in a perticular position using c#..?

问题描述

i have tried to write into a file..now i am able to write but not able to write into perticular position in a file

我尝试了什么：



i试图写到文件..现在我能够写但不能写入文件中的特定位置

What I have tried:

i have tried to write into a file..now i am able to write but not able to write into perticular position in a file

推荐答案

你正在寻找Stream。寻求（..） [ ^ ] - 用于将虚拟光标放置在流中的方法（可能是FIL e）。



请注意，写一个流的中间不会插入你正在编写的内容，但会覆盖该位置的任何内容。没有简单的开关来改变它;如果你想插入，你必须通过阅读和重写来向后移动其余部分。



取决于你是哪个特定班级对于文件访问，你可能会发现Seek-method不是直接在该类对象上，而是在BaseStream属性下，例如： myStreamWriter.BaseStream.Seek（..） 。



还要注意，通常不允许通过您通常可以使用的文件获取搜索功能。您可以检查流是否允许使用其属性 .CanSeek 进行搜索。

You're looking for the Stream.Seek(..)[^]-method with which you can position your "virtual cursor" in a stream (which may be a file).

Be aware that writing "in the middle" of a stream will not insert whatever you're writing but it will overwrite whatever already is at that position. There's no simple switch to change this; if you'd want to insert, you'd have to move the remainder backwards yourself by reading and re-writing it.

Depending on which particular class you're using for file-access you might find the Seek-method not directly on that class-object but under the BaseStream-property, e.g.: myStreamWriter.BaseStream.Seek(..) .

Also be aware that the ability to seek is not generally allowed for a stream, with files you'll usually be able to though. You can check whether a stream allows seeking with its property .CanSeek .

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