Xml c#基于另一个节点查找节点值

必须剥离名称空间才能使其加载，但这应该可以工作，无论如何在本地工作

 var xml = "<MyObjectBuilder_EntityBase>" +
        "<EntityId>173933426524952854</EntityId>" +
        "<PersistentFlags>CastShadows InScene</PersistentFlags>" +
        "<PositionAndOrientation>" +
        "<Position x='"32.206989288330078'" y='"28.401615142822266'" z='"11.562240600585937'" />" +
        "<Forward x='"0.323335081'" y='"-0.00425125659'" z='"-0.946275'" />" +
        "<Up x='"-0.9462663'" y='"-0.007667198'" z='"-0.32329765'" />" +
        "</PositionAndOrientation>" +
        "<GridSizeEnum>Small</GridSizeEnum>" +
        "<CubeBlocks>" +
        "<MyObjectBuilder_CubeBlock>" +
        "<SubtypeName>Weight</SubtypeName>" +
        "<EntityId>173933426524952855</EntityId>" +
        "<Min x='"0'" y='"0'" z='"0'" />" +
        "<BlockOrientation Forward='"Forward'" Up='"Up'" />" +
        "<ColorMaskHSV x='"0'" y='"-1'" z='"0'" />" +
        "<ShareMode>None</ShareMode>" +
        "<DeformationRatio>0</DeformationRatio>" +
        "</MyObjectBuilder_CubeBlock>" +
        "</CubeBlocks>" +
        "<IsStatic>false</IsStatic>" +
        "<Skeleton />" +
        "<LinearVelocity x='"0'" y='"0'" z='"0'" />" +
        "<AngularVelocity x='"0'" y='"0'" z='"0'" />" +
        "<XMirroxPlane />" +
        "<YMirroxPlane />" +
        "<ZMirroxPlane />" +
        "<BlockGroups />" +
        "<Handbrake>false</Handbrake>" +
        "<DisplayName>Grid 2854</DisplayName>" +
        "<DestructibleBlocks>true</DestructibleBlocks>" +
        "<CreatePhysics>true</CreatePhysics>" +
        "<EnableSmallToLargeConnections>true</EnableSmallToLargeConnections>" +
        "</MyObjectBuilder_EntityBase>";
        var doc = new XmlDocument();
        doc.LoadXml(xml);
        var xlist = new List<string>();
        var ylist = new List<string>();
        var zlist = new List<string>();
        var subtypeName = doc.SelectSingleNode("//SubtypeName");
        if (subtypeName.InnerText == "Weight")
        {
            var position = doc.SelectSingleNode("//Position");
            xlist.Add(position.Attributes["x"].Value);
            ylist.Add(position.Attributes["y"].Value);
            zlist.Add(position.Attributes["z"].Value);
        }

用一点体力来回答我自己的问题:

private void button3_Click(object sender, EventArgs e)
    {
        String choice;
        switch (comboBox1.SelectedIndex)
        {
            case 0: //player
                choice = "Player";
                break;
            case 1://weight
                choice = "Weight";
                break;
            case 2://catapult
                choice = "CatapultHead";
                break;
            case 3://ropething
                choice = "RopeEndingSmall";
                break;
            case 4://ropethingbig
                choice = "RopeReleaseSmall";
                break;
            case 5://turncross
                choice = "TurnCrossSmall";
                break;
            default:
                choice = "Blah";
                break;
        }

        Random rand = new Random();
        XmlDocument xmlDoc = new XmlDocument();
        xmlDoc.Load(pathtree);
        //XmlReader xmlReader = XmlReader.Create(pathtree);
        XmlNamespaceManager nsmanager = new XmlNamespaceManager(xmlDoc.NameTable);
        nsmanager.AddNamespace("xsi", "http://www.w3.org/2001/XMLSchema-instance");
        List<double> x = new List<double>();
        List<double> y = new List<double>();
        List<double> z = new List<double>();
        ////MyObjectBuilder_Sector/SectorObjects/MyObjectBuilder_EntityBase[@xsi:type = 'MyObjectBuilder_CubeGrid']/CubeBlocks/MyObjectBuilder_CubeBlock[@xsi:type = 'MyObjectBuilder_CubeBlock']/SubtypeName
        //xmlReader.
        while (true)
        {
            switch (comboBox1.SelectedIndex)
            {
                case 0: //player
                    x.Add( Convert.ToDouble(xmlDoc.SelectSingleNode("//MyObjectBuilder_Sector/SectorObjects/MyObjectBuilder_EntityBase[@xsi:type = 'MyObjectBuilder_Character']/PositionAndOrientation/Position", nsmanager).Attributes["x"].Value) );
                    y.Add( Convert.ToDouble(xmlDoc.SelectSingleNode("//MyObjectBuilder_Sector/SectorObjects/MyObjectBuilder_EntityBase[@xsi:type = 'MyObjectBuilder_Character']/PositionAndOrientation/Position", nsmanager).Attributes["y"].Value) );
                    z.Add( Convert.ToDouble(xmlDoc.SelectSingleNode("//MyObjectBuilder_Sector/SectorObjects/MyObjectBuilder_EntityBase[@xsi:type = 'MyObjectBuilder_Character']/PositionAndOrientation/Position", nsmanager).Attributes["z"].Value) );
                    break;
                case 1:
                    XmlNodeList nodeCollection = xmlDoc.SelectNodes("//MyObjectBuilder_Sector/SectorObjects/MyObjectBuilder_EntityBase[@xsi:type = 'MyObjectBuilder_CubeGrid']",nsmanager);
                    if (nodeCollection != null) { 
                    textBox2.Text += nodeCollection.Count;
                    }
                    for (int j = 0; j < nodeCollection.Count; j++)
                    {
                        ///////
                        if (nodeCollection[j].SelectSingleNode("//CubeBlocks/MyObjectBuilder_CubeBlock[@xsi:type = 'MyObjectBuilder_CubeBlock']/SubtypeName",nsmanager).InnerText.Equals("Weight"))
                        {
                            var position = nodeCollection[j].SelectSingleNode("//PositionAndOrientation/Position");
                            x.Add(Convert.ToDouble(position.Attributes["x"].Value));
                            y.Add(Convert.ToDouble(position.Attributes["y"].Value));
                            z.Add(Convert.ToDouble(position.Attributes["z"].Value));
                        }
                    }
                    //xmlReader.ReadToFollowing()
                    //xmlDoc.SelectNodes()
                    //x.add(from type in xmlDoc.SelectSingleNode("//MyObjectBuilder_Sector/SectorObjects/MyObjectBuilder_EntityBase[@xsi:type = 'MyObjectBuilder_Character']/PositionAndOrientation/Position", nsmanager));
                    //Select x.value('Description[1]','varchar(max)') as 'description' FROM xmlDoc.SelectNodes('//IncomeItem[TypeId=29]') i(x)
                    break;
                case 2://catapult
                    break;
                case 3://ropething
                    break;
                case 4://ropethingbig
                    break;
                case 5://turncross
                    break;
                default:
                    break;
            }
            break;
            /*
            x.Add( Convert.ToDouble(xmlDoc.SelectSingleNode("//MyObjectBuilder_Sector/SectorObjects/MyObjectBuilder_EntityBase[@xsi:type = 'MyObjectBuilder_Character']/PositionAndOrientation/Position", nsmanager).Attributes["x"].Value) );
            y.Add( Convert.ToDouble(xmlDoc.SelectSingleNode("//MyObjectBuilder_Sector/SectorObjects/MyObjectBuilder_EntityBase[@xsi:type = 'MyObjectBuilder_Character']/PositionAndOrientation/Position", nsmanager).Attributes["y"].Value) );
            z.Add( Convert.ToDouble(xmlDoc.SelectSingleNode("//MyObjectBuilder_Sector/SectorObjects/MyObjectBuilder_EntityBase[@xsi:type = 'MyObjectBuilder_Character']/PositionAndOrientation/Position", nsmanager).Attributes["z"].Value) );
            */
        }
        for (int i = 0; i < (x.Count); i++)
        {
            createTree(x[i], y[i], z[i]);
            textBox2.Text += "'r'nCREATED A TREE'r'n";
        }
    }