public static string Union(string svgdata1,params string[] svgdata)
{
if (svgdata.Length==0)return svgdata1;
SvgDocument doc1 =new SvgDocument();
doc1.PreserveWhitespace =true;
doc1.LoadXml(svgdata1);
string head=doc1.DocumentElement.CloneNode(false).OuterXml;
StringBuilder sb = new StringBuilder();
StringBuilder sbHead = new StringBuilder();
StringBuilder sbDefs = new StringBuilder();
sbHead.Append("<?xml version=\"1.0\" encoding=\"utf-8\"?>");
sbHead.Append("\n");
sbHead.Append(head.Replace("</svg>",""));
sbHead.Append("\n");
IList idList = new ArrayList();
IList graphList =new ArrayList();
foreach(XmlNode node in doc1.DocumentElement.ChildNodes)
{
if (node is Defs)
{
sbDefs.Append(node.OuterXml.Replace("</defs>",""));
sbDefs.Append("\n");
foreach(XmlNode node2 in node.ChildNodes)
{
if (node2 is XmlElement)
{
idList.Add( (node2 as XmlElement).GetAttribute("id"));
}
}
}
if (node is IGraph)
{
graphList.Add((node as XmlElement).GetAttribute("id"));
sb.Append(node.OuterXml);
sb.Append("\n");
}
}
for(int i=0;i<svgdata.Length;i++)
{
SvgDocument doc2 =new SvgDocument();
doc2.PreserveWhitespace=true;
doc2.LoadXml(svgdata[0]);
foreach(XmlNode node in doc2.DocumentElement.ChildNodes)
{
if (node is Defs)
{
foreach(XmlNode node2 in node.ChildNodes)
{
if (node2 is XmlElement )
{
XmlElement element = node2 as XmlElement;
Layer layer=element as Layer;
if(layer!=null && layer.GraphList.Count==0 )
{
continue;
}
string id =element.GetAttribute("id");
if (idList.IndexOf(id)>=0)continue;
idList.Add(id);
sbDefs.Append(element.OuterXml);
sbDefs.Append("\n");
}
if (node2 is Layer)
{
string id = ((Layer)node2).ID;
if (idList.IndexOf(id) >= 0) continue;
idList.Add(id);
sbDefs.Append(node2.OuterXml);
sbDefs.Append("\n");
}
}
}
if (node is IGraph)
{
string id = (node as XmlElement).GetAttribute("id");
if (id !=string.Empty && id!=null && graphList.IndexOf(id)>=0)continue;
graphList.Add(id);
sb.Append(node.OuterXml);
sb.Append("\n");
}
}
doc2.Dispose();
}
doc1.Dispose();
sbDefs.Append("</defs>");
sbDefs.Append("\n");
sb.Insert(0,sbDefs.ToString());
sb.Insert(0,sbHead.ToString());
sb.Append("</svg>");
return sb.ToString();
}