How do I skip exception?

Question

5.00/5 (1 vote)

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When I run this code :

FileInfo[] fs_infos = dir_info.GetFiles(pattern);//error here

            foreach (FileInfo fs_info in fs_infos)
            {
                if (target.Length == 0)
                {
                    listBox1.Items.Add(fs_info.FullName);
                }
                else
                {
                    string txt = File.ReadAllText(fs_info.FullName);

                    if (txt.IndexOf(target, StringComparison.OrdinalIgnoreCase) >= 0)
                    {
                        listBox1.Items.Add(fs_info.FullName);

                    }


                }
            }

i got IOexception.
I want to skip this file and get other files.How can I do?

What I have tried:

I have tried using try catch , i get error the name fs_infos does not exist in current ent context

Posted 7-Jul-19 17:05pm

Lê Hiển Vinh

Updated 6-Aug-20 17:25pm

v2

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4 solutions

Solution 4

Use continue in catch section

try
{
   // code
}
catch (SpecificException)
{
continue;
}

Posted 7-Jul-19 23:21pm

Member 13838971

Updated 7-Jul-19 23:35pm

v2

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OriginalGriff · Accepted Answer · 2019-07-07T18:36:00

Quote:
I have tried using try catch , i get error the name fs_infos does not exist in current ent context

The only way to "skip an exception" is to use try...catch, but the chances are you are using it incorrectly.
At a guess, you put the block around the first line only:

C#

try
   {
   FileInfo[] fs_infos = dir_info.GetFiles(pattern);
   }
catch (...)
   {
   ...
   }
foreach (FileInfo fs_info in fs_infos)
   {

Which creates it's own scope, so fs_infos is only available inside the try...catch block.

You need to put it round the whole thing if the IO error comes when you call GetFiles:

C#

try
   {
   FileInfo[] fs_infos = dir_info.GetFiles(pattern);
   foreach (FileInfo fs_info in fs_infos)
      {
      ...
      }
   }
catch (...)
   {
   ...
   }

Because GetFiles will not return any values if it throws an exception.
If that isn't the line that throws the exception, and you want to skip files that do, you need a second try...catch block inside the loop as well:

C#

try
   {
   FileInfo[] fs_infos = dir_info.GetFiles(pattern);
   foreach (FileInfo fs_info in fs_infos)
      {
      try
         {
         ...
         }
      catch (...)
         {
         ...
         }
      }
   }
catch (...)
   {
   ...
   }

BillWoodruff · Accepted Answer · 2019-07-07T20:07:00

I advise you to never ignore a Exception: when you catch an Exception, re-throw it.

Consider this example:

string path = @"C:\Users\test_user\Desktop\Test";
FileInfo[] fs_infos;
string target = "";

// Directory must exist !
if (!Directory.Exists(path))
{
    throw new DirectoryNotFoundException(@"no directory named: {path}");
}

DirectoryInfo dir = new DirectoryInfo(path);

// several types  of errors might occur here:
// UnauthorizedAccessException 
// InvalidOperationException
// etc.
try
{
    fs_infos = dir.GetFiles();
}
catch (Exception exception)
{
    // put a break-point here and examine the error
    Console.WriteLine(exception);
    throw;
}

// any files ?
if (fs_infos.Length == 0)
{
    throw new FileNotFoundException(@"no files in: {path}");
}

// now you can process files

Consider using NET >= 4 EnumerateFiles: [^]

Consider data-binding your ListBox Control to a Collection of FileInfo:

BindingSource bs = new BindingSource();
bs.DataSource = fs_infos;

listBox1.DisplayMember = "Name"
listBox1.DisplayMember = "FullName";

listBox1.DataSource = bs;

Then: the FileName (not the full file path) will show in the ListBox, and in the 'SelectedValueChanged EventHandler the 'SelectedValue will be the full file path.

Udhay Titus P · Accepted Answer · 2019-07-07T18:33:00

Solution 1

Use invoke method to ignore the exception or you can try

SpecificException

try this code

try
{
   // code
}
catch (SpecificException)
{ }

Useful links for you

C# Best way to ignore exception - Stack Overflow[^]
Ignore Exception in C# - Stack Overflow[^]
Explicitly Ignoring Exceptions in C# - Rick Strahl's Web Log[^]

Posted 7-Jul-19 18:33pm

Udhay Titus P

Comments

Lê Hiển Vinh 8-Jul-19 4:34am

Thank you very much!