Sharepoint problem saving a file over an existing file in a document library

Question

I have an existing document in a document library and I'm trying to overwrite that file in code using code like this:

byte[] data = ...
SPListItem li = ...
li.File.SaveBinary(data);

When I run this code I get:

Microsoft.SharePoint.SPException: The security validation for this page is invalid. Click Back in your Web browser, refresh the page, and try your operation again. ---> System.Runtime.InteropServices.COMException (0x8102006D): The security validation for this page is invalid. Click Back in your Web browser, refresh the page, and try your operation again.
    at Microsoft.SharePoint.Library.SPRequestInternalClass.PutFile(String bstrUrl, String bstrWebRelativeUrl, Object varFile, PutFileOpt PutFileOpt, String bstrCreatedBy, String bstrModifiedBy, Int32 iCreatedByID, Int32 iModifiedByID, Object varTimeCreated, Object varTimeLastModified, Object varProperties, String bstrCheckinComment, UInt32& pdwVirusCheckStatus, String& pVirusCheckMessage)
    at Microsoft.SharePoint.Library.SPRequest.PutFile(String bstrUrl, String bstrWebRelativeUrl, Object varFile, PutFileOpt PutFileOpt, String bstrCreatedBy, String bstrModifiedBy, Int32 iCreatedByID, Int32 iModifiedByID, Object varTimeCreated, Object varTimeLastModified, Object varProperties, String bstrCheckinComment, UInt32& pdwVirusCheckStatus, String& pVirusCheckMessage)
    --- End of inner exception stack trace ---
    at Microsoft.SharePoint.Library.SPRequest.PutFile(String bstrUrl, String bstrWebRelativeUrl, Object varFile, PutFileOpt PutFileOpt, String bstrCreatedBy, String bstrModifiedBy, Int32 iCreatedByID, Int32 iModifiedByID, Object varTimeCreated, Object varTimeLastModified, Object varProperties, String bstrCheckinComment, UInt32& pdwVirusCheckStatus, String& pVirusCheckMessage)
    at Microsoft.SharePoint.SPFile.SaveBinary(Byte[] file, String checkInComment, Boolean checkRequiredFields, Boolean bIsMigrate, Boolean bIsPublish, SPUser modifiedBy, DateTime timeLastModified, SPVirusCheckStatus& virusCheckStatus, String& virusCheckMessage)
    at Microsoft.SharePoint.SPFile.SaveBinary(Byte[] file, Boolean checkRequiredFields, Boolean bIsMigrate, Boolean bIsPublish, SPUser modifiedBy, DateTime timeLastModified)
    at Microsoft.SharePoint.SPFile.SaveBinary(Byte[] file, Boolean checkRequiredFields)
    at Microsoft.SharePoint.SPFile.SaveBinary(Byte[] file)
    at TestClass.UploadFile()

I'm running this code on a form hosted in the same site as sharepoint and the user that is running the code can upload the file manually just fine. Do I need to delete the file first? Check it out?

Answer 1

I figured it out. I was doing the call within a SPSecurity.RunWithElevatedPrivileges block which caused it to fail. I find that interesting since you would think running with elivated privileges would have more access not less.

Answer 2

Try this to fix it:

SPSecurity.RunWithElevatedPrivileges(delegate
{
  using (SPSite elevSite = new SPSite(currentWeb.Site.ID))
  {
    using (SPWeb elevWeb = elevSite.OpenWeb(currentWeb.ID))
    {
      elevWeb.AllowUnsafeUpdates = true;
      // ...
    }
  }
}

Answer 3

SPUtility.ValidateFormDigest();

    SPSecurity.RunWithElevatedPrivileges(delegate()
    {
        SPSite oSite = new SPSite("http://moss");

        SPWeb oWeb = oSite.OpenWeb();
        Response.Write(oWeb.CurrentUser.ToString());

                SPList doclib = oWeb.Lists["laser"];
                SPListItem testItem = doclib.GetItemById(1);

                oSite.AllowUnsafeUpdates = true;

                SPFile file = testItem.File;
                file.CheckOut();

                byte[] byteText = file.OpenBinary();
                string text = Encoding.UTF8.GetString(byteText, 0, byteText.Length);

                text += sbFormData;

                byte[] modifiedText = Encoding.UTF8.GetBytes(text);

                file.SaveBinary(modifiedText);
                file.CheckIn("Automatic Modification");


            oSite.AllowUnsafeUpdates = false;
            oSite.Close();
            oWeb.Close();

        });

I have written the above code. But still get the Security validation error. The stack trace is as follows. I do not understand what the problem is. Any help is appretiated. [SPException: The security validation for this page is invalid. Click Back in your Web browser, refresh the page, and try your operation again.] Microsoft.SharePoint.Library.SPRequest.ValidateFormDigest(String bstrUrl, String bstrListName) +188 Microsoft.SharePoint.SPWeb.ValidateFormDigest() +74 Microsoft.SharePoint.Utilities.SPUtility.ValidateFormDigest() +66 sendmail.Page_Load(Object sender, EventArgs e) in c:\Program Files\Common Files\Microsoft Shared\web server extensions\12\TEMPLATE\LAYOUTS\SwySiteDirectory\sendmail.aspx.cs:42 System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +15 System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +33 System.Web.UI.Control.OnLoad(EventArgs e) +99 System.Web.UI.Control.LoadRecursive() +47 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1436