public void UpdateDocument()

        {

            System.Text.ASCIIEncoding enc = new System.Text.ASCIIEncoding();

            SPSecurity.RunWithElevatedPrivileges(delegate()

            {

                using (SPSite siteColl = new SPSite(""))

                {

                    using (SPWeb web = siteColl.OpenWeb())

                    {

                        try

                        {

                            SPFile spfile = web.GetFile("");

                            if (spfile.Exists)

                            {

                                byte[] byteArrayFileContentsBefore = spfile.OpenBinary();

                                if (byteArrayFileContentsBefore.Length > 0)

                                {

                                    string strFileContentsBefore = enc.GetString(byteArrayFileContentsBefore); //convert byte array to string. 

                                    string newStr = strFileContentsBefore.Replace("");

                                    byte[] byteArrayFileContentsAfter = null;

                                    if (!newStr.Equals(""))

                                    {

                                        byteArrayFileContentsAfter = enc.GetBytes(newStr);

                                        spfile.SaveBinary(byteArrayFileContentsAfter); //save to the file.  

                                    }

                                }

                            }

                        }

                        catch (Exception e) { }

                    }

                }

            });

        }

 

 

SPFile has a CopyFile method which can copy the file to a new location. But if there was an existing file on the new location, you can set the overwrite parameter to true to overwrite it. Here is a problem, supposingly there was a workflow already on the file in the new location... when you use CopyFile.. the workflow is lost.. basically it is not an update of the file.. it is infact a delete and re-adding of the file. The following code will overcome this problem

1 2 3 4 5 6 7 8 9 10 11 12 13 14

private void UpdateDocumentForERB_ExecuteCode(SPWeb web, string originalFileUrl, string targetFileUrl) {   SPSecurity.RunWithElevatedPrivileges( delegate ()   {    SPFile OriFile = web.GetFile(originalFileUrl);    SPFile TarFile = web.GetFile(targetFileUrl);       byte [] byteArrayOriFile = OriFile.OpenBinary();       TarFile.SaveBinary(byteArrayOriFile);      });    }

 

 

public

void

UpdateDocument()

{

 

System.Text.ASCIIEncoding enc =

new

System.Text.ASCIIEncoding();

  

 

SPSecurity.RunWithElevatedPrivileges(

delegate

()

 

{

  

using

(SPSite siteColl =

new

SPSite(

""

))

  

{

   

using

(SPWeb web = siteColl.OpenWeb())

   

{

    

try

    

{   

     

SPFile spfile = web.GetFile(

""

);

     

if

(spfile.Exists)

     

{

      

byte

[] byteArrayFileContentsBefore = spfile.OpenBinary();

  

      

if

(byteArrayFileContentsBefore.Length > 0)

      

{

       

string

strFileContentsBefore = enc.GetString(byteArrayFileContentsBefore);

//convert byte array to string.

       

string

newStr = strFileContentsBefore +

"This is the new text added"

;

       

byte

[] byteArrayFileContentsAfter =

null

;

       

if

(!newStr.Equals(

""

))

       

{

        

byteArrayFileContentsAfter = enc.GetBytes(newStr);

        

spfile.SaveBinary(byteArrayFileContentsAfter);

//save to the file.

       

}

      

}

     

}

    

}

    

catch

(Exception e){}

   

} 

  

}

 

});

}