SSIS Validate a Foreach File Enumerator - ssis

Question

i have a ssis project, to start with, i have a Foreach File Enumerator and inside it are multiple tasks. It works flawlessly under normal circumstances, however if there is no file present in the enumerator directory, an error occurs, the question is, how can i make a validation or some sort for it to avoid it throwing an error on runtime? thanks
img links
ssis
http://s15.postimage.org/l41py15aj/ssis.png
error
http://s15.postimage.org/rj0qupc0b/ssiserror.png

Answer 1

You can have a script task before Foreach loop which basically checks for files and directory .Then have a precedence constraint to halt the package if either directory or files is not present .
Create 3 variables
Name DataType
Directory String
Files String
Exists int
In the script task just check if the directory is present along with the files .You can modify the code if you need to even enumerate the subfolders or check if specific files are present in the folder
if (Directory.Exists(Dts.Variables["User::Files"].Value.ToString()))
{
if (Directory.GetFiles(Dts.Variables["User::Files"].Value.ToString()).Length != 0)
{
Dts.Variables["User::Exists"].Value = 1;
}
else
{
Dts.Variables["User::Exists"].Value = 0;
}
}
else
{
Dts.Variables["User::Exists"].Value = 0;
}
In the precedence constraint check the value for the variable Exists
Evaluation operation : Expression
Expression : #Exists==1
Update :
In the script task editor you need to add the variables in the ReadOnlyVariable section in the script tag

Answer 2

I would set the expression on the Disable of the Sql Task assert whether the a file name was valid.
I haven't got SSIS here but I'll look it up.

Answer 3

You are aware of this particular case when the error occurs and you want to handle it. What if it fails for some other unforeseen error?
Always add an 'OnError' Event Handler.
Now, after handling your error condition using the event handler, you can choose to propogate this error to fail the task (which is the default behavior) or you can set the system variable, Propogate, in your 'OnError' event handler to false. This will allow the rest of the code after the For Each to continue as normal.