How to delete parent node <layer> in xml file using C#

Question

I have such code

 <symbol type="marker" clip_to_extent="1" alpha="1" tags="multilayer,rgb,black,character,icomoon,yellow" name="60201010323" force_rhr="0">
      <layer locked="0" class="SvgMarker" enabled="1" pass="0">
        <prop v="0" k="angle"/>
        <prop v="255,255,0,255" k="color"/>
        <prop v="0" k="fixedAspectRatio"/>
        <prop v="1" k="horizontal_anchor_point"/>
        <prop v="60201010323.svg" k="name"/>
        <prop v="0,0" k="offset"/>
        <prop v="3x:0,0,0,0,0,0" k="offset_map_unit_scale"/>
        <prop v="Point" k="offset_unit"/>
        <prop v="35,35,35,255" k="outline_color"/>
        <prop v="0" k="outline_width"/>
        <prop v="3x:0,0,0,0,0,0" k="outline_width_map_unit_scale"/>
        <prop v="MM" k="outline_width_unit"/>
        <prop v="diameter" k="scale_method"/>
        <prop v="16.5326" k="size"/>
        <prop v="3x:0,0,0,0,0,0" k="size_map_unit_scale"/>
        <prop v="Point" k="size_unit"/>
        <prop v="1" k="vertical_anchor_point"/>
        <data_defined_properties>
          <Option type="Map">
            <Option type="QString" value="" name="name"/>
            <Option name="properties"/>
            <Option type="QString" value="collection" name="type"/>
          </Option>
        </data_defined_properties>
      </layer>
      <layer locked="1" class="SvgMarker" enabled="1" pass="0">
        <prop v="0" k="angle"/>
        <prop v="0,0,0,255" k="color"/>
        <prop v="0" k="fixedAspectRatio"/>
        <prop v="1" k="horizontal_anchor_point"/>
        <prop v="60201010323_1.svg" k="name"/>
        <prop v="0,0" k="offset"/>
        <prop v="3x:0,0,0,0,0,0" k="offset_map_unit_scale"/>
        <prop v="Point" k="offset_unit"/>
        <prop v="35,35,35,255" k="outline_color"/>
        <prop v="0" k="outline_width"/>
        <prop v="3x:0,0,0,0,0,0" k="outline_width_map_unit_scale"/>
        <prop v="MM" k="outline_width_unit"/>
        <prop v="diameter" k="scale_method"/>
        <prop v="14.8781" k="size"/>
        <prop v="3x:0,0,0,0,0,0" k="size_map_unit_scale"/>
        <prop v="Point" k="size_unit"/>
        <prop v="1" k="vertical_anchor_point"/>
        <data_defined_properties>
          <Option type="Map">
            <Option type="QString" value="" name="name"/>
            <Option name="properties"/>
            <Option type="QString" value="collection" name="type"/>
          </Option>
        </data_defined_properties>
      </layer>
      <layer locked="1" class="SvgMarker" enabled="1" pass="0">
        <prop v="0" k="angle"/>
        <prop v="0,0,0,255" k="color"/>
        <prop v="0" k="fixedAspectRatio"/>
        <prop v="1" k="horizontal_anchor_point"/>
        <prop v="60201010323_2.svg" k="name"/>
        <prop v="0,0" k="offset"/>
        <prop v="3x:0,0,0,0,0,0" k="offset_map_unit_scale"/>
        <prop v="Point" k="offset_unit"/>
        <prop v="35,35,35,255" k="outline_color"/>
        <prop v="0" k="outline_width"/>
        <prop v="3x:0,0,0,0,0,0" k="outline_width_map_unit_scale"/>
        <prop v="MM" k="outline_width_unit"/>
        <prop v="diameter" k="scale_method"/>
        <prop v="16.5326" k="size"/>
        <prop v="3x:0,0,0,0,0,0" k="size_map_unit_scale"/>
        <prop v="Point" k="size_unit"/>
        <prop v="1" k="vertical_anchor_point"/>
        <data_defined_properties>
          <Option type="Map">
            <Option type="QString" value="" name="name"/>
            <Option name="properties"/>
            <Option type="QString" value="collection" name="type"/>
          </Option>
        </data_defined_properties>
      </layer>
    </symbol>

I want to delete some layer in symbol type="marker" where <layer locked="1" and prop v="60201010323_1.svg" k="name"/(contains underscore _)

So it's should be looked like this

 <symbol type="marker" clip_to_extent="1" alpha="1" tags="multilayer,rgb,black,character,icomoon,yellow" name="60201010323" force_rhr="0">
      <layer locked="0" class="SvgMarker" enabled="1" pass="0">
        <prop v="0" k="angle"/>
        <prop v="255,255,0,255" k="color"/>
        <prop v="0" k="fixedAspectRatio"/>
        <prop v="1" k="horizontal_anchor_point"/>
        <prop v="60201010323.svg" k="name"/>
        <prop v="0,0" k="offset"/>
        <prop v="3x:0,0,0,0,0,0" k="offset_map_unit_scale"/>
        <prop v="Point" k="offset_unit"/>
        <prop v="35,35,35,255" k="outline_color"/>
        <prop v="0" k="outline_width"/>
        <prop v="3x:0,0,0,0,0,0" k="outline_width_map_unit_scale"/>
        <prop v="MM" k="outline_width_unit"/>
        <prop v="diameter" k="scale_method"/>
        <prop v="16.5326" k="size"/>
        <prop v="3x:0,0,0,0,0,0" k="size_map_unit_scale"/>
        <prop v="Point" k="size_unit"/>
        <prop v="1" k="vertical_anchor_point"/>
        <data_defined_properties>
          <Option type="Map">
            <Option type="QString" value="" name="name"/>
            <Option name="properties"/>
            <Option type="QString" value="collection" name="type"/>
          </Option>
        </data_defined_properties>
      </layer>
</symbol>

p.s. i know that it's a bad behaviour here to ask for help, but i am not a programmer, i just have 300K lines of code and most of them are not needed, please help by providing the c# code

Answer 1

Very simple using Xml Linq :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
using System.Xml.Linq;

namespace ConsoleApplication1
{
    class Program
    {
        const string FILENAME = @"c:\temp\test.xml";
        static void Main(string[] args)
        {
            XDocument doc = XDocument.Load(FILENAME);

            List<XElement> toDelete = doc.Descendants("layer")
                .Where(XElement => ((int)XElement.Attribute("locked") == 0) && ((string)XElement.Attribute("class") == "SvgMarker"))
                .ToList();

            toDelete.Remove();

            doc.Save(FILENAME);

        }
     }
}