save layer to xml file

LedonneJuan · ‎07-22-2010

hi, i'm looking for a layer to xml file and load xml file as graphic layer but found nothing. somebody help me please.

thanks

DominiqueBroux · ‎07-24-2010

I've attached C# code allowing XML serialization/deserialization of Graphics.

It's developed as an extension of GraphicsLayer:

So, in WPF, you can serialize to a file with code like:

 
string dataFile = @"graphics.xml";
using (XmlWriter writer = XmlWriter.Create(dataFile, new XmlWriterSettings() { Indent = true }))
{
  myGraphicsLayer.SerializeGraphics(writer);
  writer.Close();
}

and deserialize with :

 
myGraphicsLayer.ClearGraphics();
using (XmlReader reader = XmlReader.Create(dataFile))
{
  myGraphicsLayer.DeserializeGraphics(reader);
  reader.Close();
}

The generated XML looks like:

 
<?xml version="1.0" encoding="utf-8"?>
<Graphics xmlns:sys="http://www.w3.org/2001/XMLSchema" xmlns:esri="http://schemas.datacontract.org/2004/07/ESRI.ArcGIS.Client.Geometry" xmlns:col="http://schemas.datacontract.org/2004/07/System.Collections.Generic" xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.datacontract.org/2004/07/ESRI.ArcGIS.Client.Samples">
<Graphic>
<Attributes>
<Attribute>
<col:key>OBJECTID</col:key>
<col:value i:type="sys:int">1</col:value>
</Attribute>
<Attribute>
<col:key>Name</col:key>
<col:value i:type="sys:string">Graphic1</col:value>
</Attribute>
</Attributes>
<Geometry i:type="esri:Polygon">
<esri:spatialReference>
<esri:wkid>4326</esri:wkid>
</esri:spatialReference>
<esri:rings>
<esri:points>
<esri:point>
<esri:spatialReference i:nil="true" />
<esri:x>120.039</esri:x>
<esri:y>-20.303</esri:y>
</esri:point>
<esri:point>
<esri:spatialReference i:nil="true" />
<esri:x>142.539</esri:x>
<esri:y>-7.0137</esri:y>
</esri:point>
<esri:point>
<esri:spatialReference i:nil="true" />
<esri:x>163.281</esri:x>
<esri:y>-13.923</esri:y>
</esri:point>
<esri:point>
<esri:spatialReference i:nil="true" />
<esri:x>172.773</esri:x>
<esri:y>-35.174</esri:y>
</esri:point>
<esri:point>
<esri:spatialReference i:nil="true" />
<esri:x>173.594</esri:x>
<esri:y>-43.18</esri:y>
</esri:point>
<esri:point>
<esri:spatialReference i:nil="true" />
<esri:x>121.797</esri:x>
<esri:y>-36.032</esri:y>
</esri:point>
<esri:point>
<esri:spatialReference i:nil="true" />
<esri:x>120.039</esri:x>
<esri:y>-20.303</esri:y>
</esri:point>
</esri:points>
</esri:rings>
</Geometry>
</Graphic>
<Graphic>
<Attributes>
<Attribute>
<col:key>OBJECTID</col:key>
<col:value i:type="sys:int">2</col:value>
</Attribute>
<Attribute>
<col:key>Name</col:key>
<col:value i:type="sys:string">Graphic2</col:value>
</Attribute>
</Attributes>
<Geometry i:type="esri:Polygon">
<esri:spatialReference i:nil="true" />
<esri:rings>
<esri:points>
<esri:point>
<esri:spatialReference i:nil="true" />
<esri:x>130.039</esri:x>
<esri:y>-20.303</esri:y>
</esri:point>
<esri:point>
<esri:spatialReference i:nil="true" />
<esri:x>152.539</esri:x>
<esri:y>-7.0137</esri:y>
</esri:point>
<esri:point>
<esri:spatialReference i:nil="true" />
<esri:x>173.281</esri:x>
<esri:y>-13.923</esri:y>
</esri:point>
<esri:point>
<esri:spatialReference i:nil="true" />
<esri:x>179.773</esri:x>
<esri:y>-35.174</esri:y>
</esri:point>
<esri:point>
<esri:spatialReference i:nil="true" />
<esri:x>179.594</esri:x>
<esri:y>-43.18</esri:y>
</esri:point>
<esri:point>
<esri:spatialReference i:nil="true" />
<esri:x>131.797</esri:x>
<esri:y>-36.032</esri:y>
</esri:point>
<esri:point>
<esri:spatialReference i:nil="true" />
<esri:x>130.039</esri:x>
<esri:y>-20.303</esri:y>
</esri:point>
</esri:points>
</esri:rings>
</Geometry>
</Graphic>
</Graphics>

You can also use it with other kind of stream. Example in silverlight with IsolatedStorage:

 
string dataFile = @"graphics.xml";
using (IsolatedStorageFile store = IsolatedStorageFile.GetUserStoreForApplication())
{
using (IsolatedStorageFileStream fileStream = store.CreateFile(dataFile))
{
using (XmlWriter writer = XmlWriter.Create(fileStream, new XmlWriterSettings() { Indent = true }))
{
graphicsLayer.SerializeGraphics(writer);
writer.Close();
}
fileStream.Close();
}�??

Note that the symbol is not serialized, so it's only working if there is a renderer associted to your layer or if you reset the symbols by code after the deserialization (else the grahics end up wihout any symbol and so are not rendered.

LedonneJuan · ‎07-25-2010

Thanks a lot Dominique. That's the one I need.

God Bless 🙂

XavierGuillard1 · ‎06-06-2011

Hi , I'm developing a MapControl Application using ARGIS Engine 9.3 .I'm wondering if it possible to serialize like you do, the IGraphicLayer or IGraphicContainer From ESRI.Arcgis.Carto to XML and also to deseralize it. I think the process is very similar to yours .

Somebody can help me please.

Thanks in advance .

BKuiper · ‎08-01-2011

I've attached C# code allowing XML serialization/deserialization of Graphics.

It's developed as an extension of GraphicsLayer:

So, in WPF, you can serialize to a file with code like:

Great post, thanks. I started out with the XmlSerializer but switch to the DataContractSerializer because of the support within the ESRI. I also used IXmlSerializer which is a interface to overwrite the regular Xml Serialization parsing and insert your own. This helped me because i made some derived classes from GraphicsLayer and Graphics that I didn't want to change that much.

Thanks again for the great post. Hopefully the ESRI objects will be further extended so we don't need to hack our own anymore 🙂

VishakhaKadam · ‎10-21-2011

Hi Dominique,

First of all I would like to thank you for this post. Great post!!

I have a question about it. I am using both the classes DataContracts.cs and GraphicsLayerExtension.cs.
    GraphicsLayer glayer = layer as GraphicsLayer;
                        using (XmlWriter writer = XmlWriter.Create(xmlFile+dataFile, new XmlWriterSettings() { Indent = true }))
                        {
                            glayer.SerializeGraphics(writer);
                            writer.Close();
                        }
This works fine. Please find attached xml file. However when when I use DeserilaizeGraphics method it only identifies <Geometry i:type="esri:Polygon">.

Here is my code:

ESRI.ArcGIS.Client.GraphicsLayer gfxLyr = new ESRI.ArcGIS.Client.GraphicsLayer();
   using (XmlReader testReader = XmlReader.Create(new FileStream(@"C:\Users\vkadam\Documents\CommandCore\SaveData\graphicsTest.xml", FileMode.Open)))
                        {
                            gfxLyr.DeserializeGraphics(testReader);
                            gfxLyr.ID = "test";
                            testReader.Close();

                            cont.BaseMap.Layers.Add(gfxLyr);

                            for(int n = 0; n < gfxLyr.Graphics.Count; n++)
                            {
                               Debug.WriteLine(gfxLyr.Graphics.Geometry);
/// does not show   <Geometry i:type="esri:Polyline">
                            }

VishakhaKadam · ‎10-21-2011

Hi Dominique,

First of all I would like to thank you for this post. Great post!!

I have a question about it. I am using both the classes DataContracts.cs and GraphicsLayerExtension.cs.

Here is code for serialization of graphic:

    GraphicsLayer glayer = layer as GraphicsLayer;
                        using (XmlWriter writer = XmlWriter.Create(xmlFile+dataFile, new XmlWriterSettings() { Indent = true }))
                        {
                            glayer.SerializeGraphics(writer);
                            writer.Close();
                        }
This works fine. Please find attached xml file. However when when I use DeserilaizeGraphics method it only identifies <Geometry i:type="esri:Polygon">.

Here is my code:

ESRI.ArcGIS.Client.GraphicsLayer gfxLyr = new ESRI.ArcGIS.Client.GraphicsLayer();
   using (XmlReader testReader = XmlReader.Create(new FileStream(@"C:\Users\vkadam\Documents\CommandCore\SaveData\graphicsTest.xml", FileMode.Open)))
                        {
                            gfxLyr.DeserializeGraphics(testReader);
                            gfxLyr.ID = "test";
                            testReader.Close();

                            BaseMap.Layers.Add(gfxLyr);

                            for(int n = 0; n < gfxLyr.Graphics.Count; n++)
                            {
                               Debug.WriteLine(gfxLyr.Graphics.Geometry);
      // does not show   <Geometry i:type="esri:Polyline"> and <Geometry i:type="esri: point">
                            }

This only shows Polygon type and not <Geometry i:type="esri:Polyline"> and <Geometry i:type="esri: point>

Am I missing something ? I really appreciate your help !!

Waiting for your reply...

Thank you,

Sincerely,
Vishakha

DominiqueBroux · ‎10-24-2011

I tested your xml file and got 11 graphics including polylines and points.

ESRI.ArcGIS.Client.Geometry.Polygon
ESRI.ArcGIS.Client.Geometry.Polygon
ESRI.ArcGIS.Client.Geometry.Polygon
ESRI.ArcGIS.Client.Geometry.Polygon
ESRI.ArcGIS.Client.Geometry.Polygon
ESRI.ArcGIS.Client.Geometry.Polyline
ESRI.ArcGIS.Client.Geometry.Polyline
ESRI.ArcGIS.Client.Geometry.Polyline
ESRI.ArcGIS.Client.Geometry.Polyline
Point[X=-11370863.6659683, Y=4344881.59797506, WKID=102100]
Point[X=-10566392.7121314, Y=4192007.05534562, WKID=102100]

How may graphics do you get?

VishakhaKadam · ‎10-24-2011

Hi Dominique,

Here is my output:

ESRI.ArcGIS.Client.Geometry.Polygon
ESRI.ArcGIS.Client.Geometry.Polygon
ESRI.ArcGIS.Client.Geometry.Polygon
ESRI.ArcGIS.Client.Geometry.Polygon
ESRI.ArcGIS.Client.Geometry.Polygon

I am still not able to find why it is not showing all the 11 graphics items as you said. I only get the 5 items.

Please find attached class files which I am using. Please let me know what am I missing or doing incorrect.

Thank you,
Vishakha

VishakhaKadam · ‎10-25-2011

Hi Dominique,

I found out that , it was this code showing only polygon types.

for(int n = 0; n < gfxLyr.Graphics.Count; n++)
{
Debug.WriteLine(gfxLyr.Graphics.Geometry);
// does not show <Geometry i:type="esri:Polyline"> and <Geometry i:type="esri: point">
}

Instead of using for loop, I used foreach (var graphics in gfxLyr.Graphics) and it worked !!

Thank you so much for your help!!

Sincerely,
Vishakha