How to delete a large number of data in SharePoint for List when refreshing data?

Preface

Recently thequestion was asked in the newsgroups about deleting a large number of itemsfrom SharePoint (WSS) in the fastest way. I had, in one if my projects,needed to remove a large number of items from SharePoint
and the best way Ifound were to use 'ProcessBatchData' as it avoided the API and was considerablyfaster.

1. Delete Common List

1.1 CAML format

<?xml version="1.0"encoding="UTF-8"?

>

<Batch>

<Method>

<SetListScope="Request">3010913d-9373-44ec-a799-0bf564cb0d66</SetList>

<SetVar Name="Cmd">DELETE</SetVar>

<SetVar Name="ID">1</SetVar>

</Method>

</Batch>

1.2 C# source code implementation

StringBuilder sbDelete = new StringBuilder();

sbDelete.Append("<?xml version=\"1.0\"encoding=\"UTF-8\"?><Batch>");

foreach (SPListItem item in CurrentList.Items)

{

sbDelete.Append("<Method>");

sbDelete.Append("<SetListScope=\"Request\">" + CurrentList.ID +"</SetList>");

sbDelete.Append("<SetVarName=\"ID\">" + Convert.ToString(item.ID) +"</SetVar>");

sbDelete.Append("<SetVarName=\"Cmd\">Delete</SetVar>");

sbDelete.Append("</Method>");

}

sbDelete.Append("</Batch>");

try

{

SPContext.Current.Site.RootWeb.ProcessBatchData(sbDelete.ToString());

}

catch (Exception ex)

{

Console.WriteLine("Delete failed: " +ex.Message);

throw;

}

2. Delete Documentlibrary list

2.1 CAML （Collaborative Application Markup Languageformat

<?xml version="1.0"encoding="UTF-8"?>

<Batch>

<Method ID='1' Cmd='Delete'>

<Field Name='ID'>1</Field>

<Field Name='FileRef'>http://basesmcdev/sites/tester1/myfile.bmp</Field>

</Method>

</Batch>

2.2 C# source code implementation

SPSecurity.RunWithElevatedPrivileges(delegate()

{

using (SPSite site = new SPSite("http://virus/sites/intranet"))

{

using (SPWeb web = site.OpenWeb("team"))

{

site.AllowUnsafeUpdates = true;

web.AllowUnsafeUpdates = true;

SPList list = web.Lists["documentExample"];

StringBuilder sbDelete = new StringBuilder();

sbDelete.Append("<?xml version=\"1.0\" encoding=\"UTF-8\"?><Batch>");

foreach (SPListItem item in list.Items)

{

sbDelete.Append("<Method>");

sbDelete.Append("<SetList Scope=\"Request\">" + list.ID + "</SetList>");

sbDelete.Append("<SetVar Name=\"ID\">" + Convert.ToString(item.ID) + "</SetVar>");

sbDelete.Append("<SetVar Name=\"Cmd\">Delete</SetVar>");

sbDelete.Append("<SetVar Name=\"owsfileref\">"+item.GetFormattedValue("FileRef")+"</SetVar>");

sbDelete.Append("</Method>");

}

sbDelete.Append("</Batch>");

try

{

Console.WriteLine( web.ProcessBatchData(sbDelete.ToString()));

}

catch

{

throw;

}

site.AllowUnsafeUpdates = false;

web.AllowUnsafeUpdates = false;

}

}

});

Reference documentation

1. http://www.cnblogs.com/laputa-sky/archive/2008/10/21/1299867.html

2. http://www.cnblogs.com/virusswb/archive/2009/01/21/1379275.html

3. http://msdn.microsoft.com/zh-cn/library/ms414322(v=office.14).aspx

4. http://msdn.microsoft.com/zh-cn/library/ms426449(v=office.14).aspx

5. Delete Folder http://platinumdogs.me/2009/07/13/delete-a-folder-from-a-sharepoint-document-library/