将 .NET StreamWriter 输出重定向到 String 变量

发布于 2024-07-07 11:42:47 字数 268 浏览 7 评论 0原文

我想知道是否可以将 StreamWriter 输出重定向到变量，

例如

String^ myString;
StreamWriter sw = gcnew StreamWriter([somehow specify myString])
sw->WriteLine("Foo");

myString 将包含 Foo。我想这样做的原因是重用一个复杂的函数。我可能应该将其重构为字符串返回函数，但知道它仍然是一个很好的技巧

原文

I'd like to know if it is possible to redirect StreamWriter output to a variable

Something like

String^ myString;
StreamWriter sw = gcnew StreamWriter([somehow specify myString])
sw->WriteLine("Foo");

then myString will contain Foo.
The reason I would like to do this is to reuse a complex function. I should probably refactor it into a String returning function but it still would be a nice hack to know

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听风吹 2024-07-14 11:42:47

您可以使用 StringWriter 将值直接写入字符串构建器对象来完成此操作

StringBuilder sb = new StringBuilder();
StringWriter sw = new StringWriter(sb);
// now, the StringWriter instance 'sw' will write to 'sb'

You can do this with a StringWriter writing the value directly to a string builder object

StringBuilder sb = new StringBuilder();
StringWriter sw = new StringWriter(sb);
// now, the StringWriter instance 'sw' will write to 'sb'

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陈年往事 2024-07-14 11:42:47

StreamWriter 和 StringWriter 都扩展了 TextWriter，也许您可以重构使用 StreamWriter 的方法来使用 TextWriter，这样它可以写入流或字符串吗？

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夜夜流光相皎洁 2024-07-14 11:42:47

您应该能够使用内存流执行您需要的操作。

MemoryStream mem = new MemoryStream(); 
StreamWriter sw = new StreamWriter(mem);
sw.WriteLine("Foo"); 
// then later you should be able to get your string.
// this is in c# but I am certain you can do something of the sort in C++
String result = System.Text.Encoding.UTF8.GetString(mem.ToArray(), 0, (int) mem.Length);

You should be able to do what you need using a Memory Stream.

MemoryStream mem = new MemoryStream(); 
StreamWriter sw = new StreamWriter(mem);
sw.WriteLine("Foo"); 
// then later you should be able to get your string.
// this is in c# but I am certain you can do something of the sort in C++
String result = System.Text.Encoding.UTF8.GetString(mem.ToArray(), 0, (int) mem.Length);

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