How to create and call the method(Using Thread C#) in for each loop? - multithreading

Question

I wanted to call my custom method in the Thread.
public void LoopOverAllLists(String _webAndSiteXml)
{
try
{
XmlNode _nodelist = SharePoint.ListsGetListCollection();
foreach (System.Xml.XmlNode _item in _nodelist.ChildNodes)
{
string title = _item.Attributes["Title"].Value;
//check for hidden list
if (_item.Attributes["Hidden"].Value.ToLower() == "false")
{
switch (_item.Attributes["ServerTemplate"].Value)
{
//Check whether list is document library
case SharePoint.LIST_ID_DOCUMENT_LIBRARY:
case SharePoint.LIST_ID_XML_FORMS:
case SharePoint.Publishing_ID_Pages:
{
//Get all documents info
try
{
GetAllDocumentsInfo(_item, _webAndSiteXml);
}
catch
{
}
break;
}
//Check whether list is having attachment
case SharePoint.LIST_ID_GENERIC:
case SharePoint.LIST_ID_ANNOUNCEMENTS:
case SharePoint.LIST_ID_CONTACTS:
case SharePoint.LIST_ID_TASKS:
case SharePoint.LIST_ID_EVENTS:
case SharePoint.LIST_ID_CUSTOM_GRID:
case SharePoint.LIST_ID_MEETING_SERIES:
case SharePoint.LIST_ID_MEETING_AGENDA:
case SharePoint.LIST_ID_MEETING_ATTENDEES:
case SharePoint.LIST_ID_MEETING_DECISIONS:
case SharePoint.LIST_ID_MEETING_OBJECTIVES:
case SharePoint.LIST_ID_MEETING_TTB:
case SharePoint.LIST_ID_MEETING_WS_PAGES:
case SharePoint.LIST_ID_PORTAL_SITE_LIST:
{
//Get all list items info having attachment
try
{
GetAllListItemsInfoOnlyAttachments(_item, _webAndSiteXml);
}
catch
{
}
break;
}
default:
GetAllListItemsInfoOnlyAttachments(_item, _webAndSiteXml);
break;
}
// Get All the List Forms
try
{
GetAllListForms(title, _webAndSiteXml);
}
catch
{
}
}
}
}
catch (Exception ex)
{
throw ex;
}
}
in above method three methods which is " GetAllDocumentsInfo , GetAllListItemsInfoOnlyAttachments and GetAllListForms " I wanted to call these function using thread in C#.
Thanks

Answer 1

Here is how I would approach the problem. Notice that I encapsulated the contents of the foreach loop into a separate method and then queued the execution of that method into the ThreadPool so that each iteration of the loop occurs in parallel. I also use a well established pattern to wait for all pending work items to complete. This code is compatible with .NET 3.5.
public void LoopOverAllLists(String _webAndSiteXml)
{
int pending = 1; // Used to track the number of pending work items.
var finished = new ManualResetEvent(false); // Used to wait for all work items to complete.
XmlNode nodes = SharePoint.ListsGetListCollection();
foreach (XmlNode item in nodes)
{
XmlNode capture = item; // This is required to capture the loop variable correctly.
Interlocked.Increment(ref pending); // There is another work item in progress.
ThreadPool.QueueUserWorkItem(
(state) =>
{
try
{
ProcessNode(capture);
}
finally
{
// Signal the event if this is the last work item to complete.
if (Interlocked.Decrement(ref pending) == 0) finished.Set();
}
}, null);
}
// Signal the event if the for loop was last work item to complete.
if (Interlocked.Decrement(ref pending) == 0) finished.Set();
// Wait for all work items to complete.
finished.WaitOne();
}
private void ProcessNode(XmlNode item)
{
// Put the contents of your loop here.
}

Answer 2

instead of calling
GetAllDocumentsInfo(_item, _webAndSiteXml);
use
Task.Factory.StartNew(() => GetAllDocumentsInfo(_item, _webAndSiteXml));
repeat this pattern for the other method calls as well