Question

 private void btnmap_Click(object sender, EventArgs e)
 { 
 XmlDocument xmldoc = new XmlDocument();
                 XmlNode xmlnode, xmlroot, docNode, Doc;
                 XmlAttribute xmlatt;
                 docNode = xmldoc.CreateXmlDeclaration("1.0", "UTF-8", null);
                 xmldoc.AppendChild(docNode);                
                 if (rchtextfile.Text == "")
                 {
                     MessageBox.Show("Please Select a Text file", "File Name Error", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                 }
                 else
                 {
                     con = new System.Data.SqlClient.SqlConnection();
                     DataSet ds = new DataSet();
                     con.ConnectionString = @"Server=MDS-SW02; User ID=sa; Pwd=Admin2011; Initial Catalog=xml;";
                     con.Open();
                     MessageBox.Show("Database Connected");                    
                     String sql = "select Styles from Xml_Tags,pdfelement where Xml_Tags.Mapping_Id=pdfelement.Mapping_Id AND Xml_Tags.Pdf_Tag=pdfelement.Element_Name AND pdfelement.Style=Xml_Tags.Styles";
                     com = new SqlCommand(sql);
                     da = new System.Data.SqlClient.SqlDataAdapter(sql, con);
                     da.Fill(ds, "xml");
                     maxrows = ds.Tables["xml"].Rows.Count;
                     StreamReader objReader = new StreamReader(file, Encoding.Default, true);
                     do
                     {                       
                         for (int i = 0; i < maxrows; i++)
                         {                           
                             dRow = ds.Tables["xml"].Rows[i];                             
                             line = objReader.ReadLine();
                             if (line == null)
                             {
                                 //xmldoc.Save(ya);
                             }
                             else
                             {
                                 string st1 = ">";
                                 string st2 = "</";
                                 int end = line.IndexOf(st2);
                                 if (end != -1 && end > 1)
                                 {
                                     st = line.IndexOf(st1);
                                     en = line.IndexOf(st2);
                                     int v = en - st;
                                     sub = line.Substring(st + 1, v - 1);
                                     rchtext.Text = rchtext.Text + sub + "\r\n";
                                 }                                                                  
                                 String sqll = "select Dtd_Tag from Xml_Tags,pdfelement where Xml_Tags.Mapping_Id=pdfelement.Mapping_Id AND Xml_Tags.Pdf_Tag=pdfelement.Element_Name AND pdfelement.Style=Xml_Tags.Styles";
                                 SqlCommand comm = new SqlCommand(sqll);
                                 SqlDataAdapter daa = new System.Data.SqlClient.SqlDataAdapter(sqll, con);
                                 DataSet ds1 = new DataSet();
                                 daa.Fill(ds1, "xml");
                                 dRow1=ds1.Tables["xml"].Rows[i];                                
                                 String sqlll = "select Dtd_Attribute_Name from Mapped_Tags_Attributes,Xml_Tags where Mapped_Tags_Attributes.Pdf_Tag=Xml_Tags.Pdf_Tag AND Mapped_Tags_Attributes.Mapping_Id=Xml_Tags.Mapping_Id";
                                 SqlCommand cmd = new SqlCommand(sqlll);
                                 SqlDataAdapter dt = new System.Data.SqlClient.SqlDataAdapter(sqlll, con);
                                 DataSet ds2 = new DataSet();
                                 dt.Fill(ds2, "xml");
                                 dRow2 = ds2.Tables["xml"].Rows[i];
                                 name = XmlConvert.EncodeName(dRow1.ItemArray.GetValue(0).ToString());
                                 xmlnode = xmldoc.CreateElement(name);
                                 Doc = xmldoc.CreateDocumentType(name, null, "E:\\Rachana_mds\\proj\\pdfextraction\\docbook.dtd", null);                                
                                 xmlroot = xmldoc.CreateElement(name);                                 
                                 xmlatt = xmldoc.CreateAttribute(dRow2.ItemArray.GetValue(0).ToString());
                                 xmlroot.AppendChild(xmlnode);
                                 xmlnode.InnerText = sub;                                                                
                             }
                         }
                     }                    
                     while (dRow[0].ToString()!=line && !objReader.EndOfStream);
                         MessageBox.Show("Done");
                         string filename = @"E:" + DateTime.Now.Day + DateTime.Now.Month + DateTime.Now.Minute + ".xml";                         
                         xmldoc.Save(filename);                                                  
                         MessageBox.Show("Successfully saved");                                              
                 }                
                 con.Close();              
}

我收到此行的错误。 ...xmldoc.Save(filename);

Answer 1

你永远不会打电话给doc.AppendChild(xmlroot);，所以虽然你已经创建元素，但你从来没有真正把它们放在文档中。因此它没有根元素。

现在，如果你做了创建根元素并添加它，如果for循环执行了多次，你仍然会遇到问题，因为你试图添加多个根。您可能希望在循环外部创建xmlroot ，然后在循环中创建嵌套元素。

如果你可以使用.NET 3.5或更高版本以及LINQ to XML，顺便说一下，很多这些代码会简单得多......

Answer 2

以下行也不正确：

string filename = @"E:" + DateTime.Now.Day + DateTime.Now.Month + DateTime.Now.Minute + ".xml";

用以下代码替换：

string filename = @"E:\\" + DateTime.Now.Day + DateTime.Now.Month + DateTime.Now.Minute + ".xml";

无效的XML文档，该文档没有根元素

2 个答案: