使用BinaryWriter捕获错误

Question

I am using a using with the BinaryWriter as follows:

using (BinaryWriter writer = new BinaryWriter(File.Open(configData.RxOutFn, FileMode.Create)))
{
    // Do Something
}

Sometimes I have the file open in another app, and the Create fails, how can I catch this error?

I tried putting a try/catch around the whole thing like this:

try
{
    using (BinaryWriter writer = new BinaryWriter(File.Open(configData.RxOutFn, FileMode.Create)))
    {
        // Do something                    
    }
}
catch
{
    // Display error
}

But I am worried it will catch the wrong thing as there is lots of code in the

// Do Something

Any ideas how i can catch this error?

Many thanks in advance

Andy

Answer 1

Check what exception gets thrown ( File.Open throws an IOException which I think is what gets thrown when the file can't be created) and catch that specific exception:

try
{
    using (BinaryWriter writer = new BinaryWriter(File.Open(configData.RxOutFn, FileMode.Create)))
    {
        // Do something                    
    }
}
catch (IOException e)
{
    // Display error
}