英文:
Will an anonymous StreamReader close automatically?
问题
以下是翻译好的部分：
首先，使用FileStream的好处是什么？我明白StreamReader可以直接接受文件路径。
using (var reader = new StreamReader(CustomSettingsFile.FullName))
{
var data = reader.ReadToEnd();
}
其次，如果我只使用一次读取器，难道我不能只使用匿名方式并省略using吗？
var data = new StreamReader(CustomSettingsFile.FullName).ReadToEnd();
英文:
I've found the following code in a project I'm working on and I'm curious to know if it can be written more succinctly.
using (var stream = new FileStream(CustomSettingsFile.FullName, FileMode.Open, FileAccess.Read))
{
using (var reader = new StreamReader(stream))
{
var data = reader.ReadToEnd();
}
}
Firstly, what's the benefit of using FileStream? I understand that StreamReader can take a file path directly.
using (var reader = new StreamReader(CustomSettingsFile.FullName))
{
var data = reader.ReadToEnd();
}
Secondly, if I'm only using the reader once, can't I just anonymize it and omit the using?
var data = new StreamReader(CustomSettingsFile.FullName).ReadToEnd();
答案1
得分: 3
I'm curious to know if it can be written more succinctly.
首先，我想知道是否可以更加简洁地编写它。
First thing you can do in this specific case is to omit extra curly braces:
在这种特定情况下，你可以首先省略额外的花括号：
using (var stream = new FileStream(CustomSettingsFile.FullName, FileMode.Open, FileAccess.Read))
using (var reader = new StreamReader(stream))
{
var data = reader.ReadToEnd();
}
Firstly, what's the benefit of using FileStream? I understand that StreamReader can take a file path directly.
首先，使用FileStream有什么好处？我理解StreamReader可以直接接受文件路径。
Based on the current implementation none, except for explicitly specifying the FileMode and FileAccess, though as far as I can see StreamReader will use the same defaults.
根据当前的实现，除了明确指定FileMode和FileAccess之外，没有好处，尽管据我所见，StreamReader将使用相同的默认值。
Secondly, if I'm only using the reader once, can't I just anonymize it and omit the using?
其次，如果我只使用一次读取器，我不能只将其匿名化并省略使用吗？
No. You need to deterministically free the unmanaged resources when you have finished using them. General rule of thumb: If something implements IDisposable then it should be disposed (for example via using which handles exceptions).
不可以。在使用完它们后，你需要确定性地释放非托管资源。一般的经验法则是：如果某物实现了IDisposable，那么它应该被释放（例如通过using来处理异常）。
Note that since C# 8.0 you can leverage using declarations in some cases, which will call dispose at the end of the current scope:
请注意，自从C# 8.0以来，在某些情况下，你可以利用using declarations，它将在当前作用域的末尾调用dispose：
using var reader = new StreamReader(CustomSettingsFile.FullName);
var data = reader.ReadToEnd();
Also, in case when you don't actually need streaming (i.e., you need the whole data at a time), consider using File.ReadAllText which will do all the work for you.
此外，在实际上不需要流式传输（即，你需要一次性获取整个数据）的情况下，考虑使用 File.ReadAllText，它会为你完成所有工作。
Read also:
还阅读：
英文:
> I'm curious to know if it can be written more succinctly.
First thing you can do in this specific case is to omit extra curly braces:
using (var stream = new FileStream(CustomSettingsFile.FullName, FileMode.Open, FileAccess.Read))
using (var reader = new StreamReader(stream))
{
var data = reader.ReadToEnd();
}
> Firstly, what's the benefit of using FileStream? I understand that StreamReader can take a file path directly.
Based on the current implementation none, except for explicitly specifying the FileMode and FileAccess, though as far as I can see StreamReader will use the same defaults.
> Secondly, if I'm only using the reader once, can't I just anonymize it and omit the using?
No. You need to deterministically free the unmanaged resources when you have finished using them. General rule of thumb: If something implements IDisposable then it should be disposed (for example via using which handles exceptions).
Note that since C# 8.0 you can leverage using declarations in some cases, which will call dispose at the end of current scope:
using var reader = new StreamReader(CustomSettingsFile.FullName);
var data = reader.ReadToEnd();
Also in case when you don't actually need streaming (i.e. you need the whole data at a time) consider using File.ReadAllText which will do all the work for you.
Read also:
答案2
得分: 1
我很好奇是否可以更简洁地编写。
您可以使用File.ReadAllText或File.ReadAllTextAsync方法来代替。
它们在底层创建并处理了StreamReader 内部。
英文:
> I'm curious to know if it can be written more succinctly.
You can use File.ReadAllText or File.ReadAllTextAsync methods instead.
They create and dispose StreamReader under the hood.
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论