Calling a Stored Procedure with XML Datatype

Question

I am simply trying to call a store procedure (SQL Server 2008) using C# and passing XMLDocument to a store procedure parameter that takes a SqlDbType.Xml data type. I am getting error: Failed to convert parameter value from a XmlDocument to a String. Below is code sample. How do you pass an XML Document to a store procedure that is expecting an XML datatype? Thanks.

        XmlDocument doc = new XmlDocument();
        //Load the the document with the last book node.
        XmlTextReader reader = new XmlTextReader(@"C:\temp\" + uploadFileName);
        reader.Read();
        // load reader 
        doc.Load(reader);

        connection.Open();

        SqlCommand cmd = new SqlCommand("UploadXMLDoc", connection);

        cmd.CommandType = CommandType.StoredProcedure;

        cmd.Parameters.Add("@Year", SqlDbType.Int);
        cmd.Parameters["@Year"].Value = iYear;
        cmd.Parameters.Add("@Quarter", SqlDbType.Int);
        cmd.Parameters["@Quarter"].Value = iQuarter;
        cmd.Parameters.Add("@CompanyID", SqlDbType.Int);
        cmd.Parameters["@CompanyID"].Value = iOrganizationID;
        cmd.Parameters.Add("@FileType", SqlDbType.VarChar);
        cmd.Parameters["@FileType"].Value = "Replace";
        cmd.Parameters.Add("@FileContent", SqlDbType.Xml);
        cmd.Parameters["@FileContent"].Value = doc;
        cmd.Parameters.Add("@FileName", SqlDbType.VarChar);
        cmd.Parameters["@FileName"].Value = uploadFileName;
        cmd.Parameters.Add("@Description", SqlDbType.VarChar);
        cmd.Parameters["@Description"].Value = lblDocDesc.Text;
        cmd.Parameters.Add("@Success", SqlDbType.Bit);
        cmd.Parameters["@Success"].Value = false;
        cmd.Parameters.Add("@AddBy", SqlDbType.VarChar);
        cmd.Parameters["@AddBy"].Value = Page.User.Identity.Name;

        cmd.ExecuteNonQuery();
        connection.Close();

Answer 1

From this, it looks like you need to pass a string in, instead of an XmlDocument.

Answer 2

You need to pass the xml as a string.

But if you don't need the xml functions in the database, you might consider using varbinary to store the files.

Answer 3

Another simpler way is to write the xmldoc to a string and pass that to the stored procedure.

Dim sb As New StringBuilder()
Dim wrtr As New System.IO.StringWriter(sb)
doc.Save(wrtr)
Dim strxml As String = sb.ToString()
cmd.Parameters.Add("@FileContent", SqlDbType.Xml);
cmd.Parameters["@FileContent"].Value =strxml;

Answer 4

Other way to do it if you don't mind loosing the xml declaration (version and encoding) is just:

XML.DocumentElement.OuterXml 'where XML is a XMLDocument