Diagram drag and drop node (v 19.4.0.38)
Hi,
I am trying the following, I have a diagram that contains nodes, those are using the card component to be rendered. I started with one of your example :
https://www.syncfusion.com/forums/158986/dragging-nodes-to-create-and-delete-connections
and made some adjustments :
<SfDiagram Width="1000px" Height="@Height" @ref="@diagram" Nodes="nodes">
<DiagramEvents OnDrop="@OnDrop" SelectionChanged="@SelectionChange"></DiagramEvents>
<DiagramTemplates>
<NodeTemplate>
@{
var noeudDirection = context as Node;
if (noeudDirection.Data.Contains("|"))
{
<SfCard ID="@((context as Node).Id)">
<CardHeader Title="@(noeudDirection.Data.Split("|")[0])" SubTitle="@(noeudDirection.Data.Split("|")[1])" ImageUrl=@(noeudDirection.Data.Split("|")[2]) />
</SfCard>
}
else
{
<SfCard ID="@((context as Node).Id)">
<CardHeader Title="@((context as Node).Data)" ImageUrl="@((context as Node).Data)" />
</SfCard>
}
}
</NodeTemplate>
</DiagramTemplates>
</SfDiagram>
and
protected override void OnInitialized()
{
Palettes = new ObservableCollection<SymbolPalettePalette>();
nodes = new ObservableCollection<DiagramNode>();
data.Add("Mass", 15);
data.Add("Pressure", 50);
data.Add("Velocity", 30);
DiagramNode node1 = new DiagramNode()
{
Id = "node1",
Height = 100,
Width = 100,
OffsetX = 300,
OffsetY = 100
};
node1.Constraints = NodeConstraints.Default | NodeConstraints.AllowDrop;
nodes.Add(node1);
basicShapes = new ObservableCollection<Object>()
{
new DiagramNode()
{
Id = "Rectangle",
Shape = new DiagramShape() { Type = Shapes.Basic, BasicShape = Syncfusion.Blazor.Diagrams.BasicShapes.Rectangle },
AddInfo = data
},
};
Palettes.Add(new SymbolPalettePalette() { Id = "BasicShapes", Expanded = true, Symbols = basicShapes, Title = "Basicshapes" });
}
Now look what happens in the console when I do the following steps :
1- Drag a new node 
2- Move the first node around
3- Drop the new node into the node 1 :
The exception appears and the event will not be triggered.
Can you reproduce and gives some advice as how to mitigate that error?
Thanks
