Attach file to list item programmatically using web service

Hi All,

In SharePoint if we want to attach a file to any existing list item and we are in any other asp.net or client / server application or just any other console application, then we can use SharePoint web services to attach a file to existing list item.

Here is a sample code to attach a file to existing list item.

Write down the below code and you are good to go. Just see the argument of addattachment method of lists.asmx web service. In my case, I am attaching my file to item which has ID 7.

See image before running this code.

private void button7_Click(object sender, EventArgs e)
{
string strFilePath= textBox1.Text;

if (!File.Exists(strFilePath))
{
throw new ArgumentException(String.Format("{0} does not exist",
strFilePath), "srcUrl");
}

FileStream Stream = File.OpenRead(strFilePath);
string fileName = Stream.Name.Substring(3);
byte[] contents = new byte[Stream.Length];
Stream.Read(contents, 0, (int)Stream.Length);
Stream.Close();


DownloadListItems.Lists objLists = new EncryptAndDecrypt.DownloadListItems.Lists();

objLists.Credentials = System.Net.CredentialCache.DefaultCredentials;

objLists.Url = "{site url}/_vti_bin/lists.asmx";

try
{
string addAttach = objLists.AddAttachment("DummyList", "7", fileName, contents);

}

catch (System.Web.Services.Protocols.SoapException ex)
{

}


}

See below image after running above code.



That is it. you have just attached your file to the existing list item.