Passing paramters from event handler to another function

Hesham Hassanein

How can i pass a var parameter from event handler to another function

I am watching a directory and doing an event handler when file is created go to the function ReadData. So how can i pass the values of tempfilepath and fileName to ReadData function?. thanks in advance

static void OnCreated(object source, FileSystemEventArgs e)
{
int P_Count = 0;
// Specify what is done when a file is created
Console.WriteLine("File: " + e.FullPath + " " + e.ChangeType);
SomeGlobalVariables.fileName = e.FullPath;
SomeGlobalVariables.counter++;
string[] fileArray = new string[SomeGlobalVariables.counter];
for (int count = 0; count <= fileArray.Length - 1; count++)
{
fileArray[count] = SomeGlobalVariables.fileName;
SomeGlobalVariables.filenameslist.Add(fileArray[count]);
P_Count = P_Count + 1; // Number of added files
Console.WriteLine ("Number of Files in the list = " + P_Count);
foreach (var filenames in SomeGlobalVariables.filenameslist)
{
var fileName = filenames;
var Name_File = Path.GetFileName(fileName);
var tempfilepath = (@"C:\Users\" + Name_File + ".CSV");
}
}
static void ReadData()
{
using (System.IO.StreamWriter tempfile = new System.IO.StreamWriter(tempfilepath))
{
System.IO.StreamReader reader = new System.IO.StreamReader(fileName);
}}

3 Replies

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theLizard10y ago
If you are watching a directory for new files being created then, each file created will (or should) fire the event in which case it will be fired for that particular file created.
In other words the event will fire for 1 and only 1 file creation, this will be done for each file created so if, 2 files are created in sequence you will have 2 events fired.
You can ONLY deal with 1 file at a time you cannot do what your code is suggesting, that is why you are getting errors.
There is NO array of files created, at best this is all you need to do,
static void OnCreated(object source, FileSystemEventArgs e)
{
ReadData(e.FullPath);
}
That's it, this will be done for each new file created.
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Madhanmohan Devarajan10y ago
Even though you are copying two files to the Directory still the OnCreated event method has one event captured in the "e" has the first file created in the directory. In this case you need to use timer elapse in your OnCreated even to get the file created event called one more time.
Dictionary dateTimeDictionary = new Dictionary();
//On created method starting
static void OnCreated(object source, FileSystemEventArgs e)
{
int P_Count = 0;
if (!dateTimeDictionary.ContainsKey(e.FullPath) || (dateTimeDictionary.ContainsKey(e.FullPath) && System.IO.File.GetLastWriteTime(e.FullPath) != dateTimeDictionary[e.FullPath]))
{
dateTimeDictionary[e.FullPath] = System.IO.File.GetLastWriteTime(e.FullPath);

// Specify what is done when a file is created
Console.WriteLine("File: " + e.FullPath + " " + e.ChangeType);

//SomeGlobalVariables.fileName = e.FullPath;
//SomeGlobalVariables.counter++;
//string[] fileArray = new string[SomeGlobalVariables.counter];
//for (int count = 0; count <= fileArray.Length - 1; count++)
//{
//fileArray[count] = SomeGlobalVariables.fileName;
//SomeGlobalVariables.filenameslist.Add(fileArray[count]);
//P_Count = P_Count + 1; // Number of added files
//Console.WriteLine ("Number of Files in the list = " + P_Count);
//foreach (var filenames in SomeGlobalVariables.filenameslist)
//{
//SomeGlobalVariables.fileName = filenames;
//SomeGlobalVariables.Name_File = Path.GetFileName(SomeGlobalVariables.fileName);
//SomeGlobalVariables.tempfilepath = (@"C:\Users\" + SomeGlobalVariables.Name_File + ".CSV");
//var fileName = filenames;
var Name_File = Path.GetFileName(e.FullPath);
var tempfilepath = (@"C:\Userst\" + Name_File + ".CSV");
ReadData(tempfilepath, fileName);
//}
}
}
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Madhanmohan Devarajan10y ago
You can try below code and the yellow highlighted part is the change.
foreach (var filenames in SomeGlobalVariables.filenameslist)
{
var fileName = filenames;
var Name_File = Path.GetFileName(fileName);
var tempfilepath = (@"C:\Users\" + Name_File + ".CSV");
ReadData(tempfilepath);
}
}

static void ReadData(string tempFilenamePath)
{
using (System.IO.StreamWriter tempfile = new System.IO.StreamWriter(tempfilepath))
{

System.IO.StreamReader reader = new System.IO.StreamReader(fileName);
}}
0