问题
This is probably a pretty simple question. In C# I'm trying to write a simple method, called my "DebugWrite" method, to write out any exceptions caught within my program to a text file stored locally. My current code only writes a new file every time, using StreamWriter
How do you program it to check if the file already exists, and if so to append to the current text?. IE:
If(~Exist(debug.txt)
{
Write new debug.txt.
}
else if(exist(debug.txt))
{
Append new text.
}
回答1:
using(StreamWriter writer = new StreamWriter("debug.txt", true))
{
writer.WriteLine("whatever you text is");
}
The second "true" parameter tells it to append.
http://msdn.microsoft.com/en-us/library/36b035cb.aspx
回答2:
Also look at log4net, which makes logging to 1 or more event stores — whether it's the console, the Windows event log, a text file, a network pipe, a SQL database, etc. — pretty trivial. You can even filter stuff in its configuration, for instance, so that only log records of a particular severity (say ERROR or FATAL) from a single component or assembly are directed to a particular event store.
http://logging.apache.org/log4net/
来源：https://stackoverflow.com/questions/8854984/append-text-using-streamwriter