将.NET StreamWriter输出重定向到String变量

Question

我想知道是否可以将StreamWriter输出重定向到变量

就像是

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

那么myString将包含Foo.我想这样做的原因是重用一个复杂的函数.我应该将它重构为一个String返回函数,但它仍然是一个很好的黑客知道

Answer 1

您可以使用StringWriter将值直接写入字符串构建器对象

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

Answer 2

StreamWriter和StringWriter都扩展了TextWriter,也许你可以重构使用StreamWriter来使用TextWriter的方法,以便它可以写入流或字符串？

Answer 3

您应该能够使用Memory Stream完成所需的操作.

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);

Answer 4

试试这段代码=]

StringBuilder sb = new StringBuilder();
StringWriter sw = new StringWriter(sb);
string s = sb.ToString(); <-- Now it will be a string.