Dialog drag drop error

[Scott Peal]

Drag and drop a palette node and Chrome gives this error. 

Newtonsoft.Json.JsonSerializationException: Error converting value "[]" to type 'System.Collections.ObjectModel.ObservableCollection`1[Syncfusion.Blazor.Diagrams.DiagramNode]'. Path 'nodes', line 1, position 13.

 ---> System.ArgumentException: Could not cast or convert from System.String to System.Collections.ObjectModel.ObservableCollection`1[Syncfusion.Blazor.Diagrams.DiagramNode].

   at Newtonsoft.Json.Utilities.ConvertUtils.EnsureTypeAssignable(Object value, Type initialType, Type targetType)

   at Newtonsoft.Json.Utilities.ConvertUtils.ConvertOrCast(Object initialValue, CultureInfo culture, Type targetType)

   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.EnsureType(JsonReader reader, Object value, CultureInfo culture, JsonContract contract, Type targetType)

   --- End of inner exception stack trace ---

   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.EnsureType(JsonReader reader, Object value, CultureInfo culture, JsonContract contract, Type targetType)

   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.SetPropertyValue(JsonProperty property, JsonConverter propertyConverter, JsonContainerContract containerContract, JsonProperty containerProperty, JsonReader reader, Object target)

   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.PopulateObject(Object newObject, JsonReader reader, JsonObjectContract contract, JsonProperty member, String id)

   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateObject(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue)

   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize(JsonReader reader, Type objectType, Boolean checkAdditionalContent)

   at Newtonsoft.Json.JsonSerializer.DeserializeInternal(JsonReader reader, Type objectType)

   at Newtonsoft.Json.JsonConvert.DeserializeObject(String value, Type type, JsonSerializerSettings settings)

   at Syncfusion.Blazor.BaseComponent.ChangeType(Object value, Type conversionType, Boolean isClientChange)

   at Syncfusion.Blazor.BaseComponent.UpdateComponentModel(Dictionary`2 properties, BaseComponent parentObject, Boolean isAutoInitialized)

   at Syncfusion.Blazor.BaseComponent.UpdateModel(Dictionary`2 properties)

Error: Newtonsoft.Json.JsonSerializationException: Error converting value "[]" to type 'System.Collections.ObjectModel.ObservableCollection`1[Syncfusion.Blazor.Diagrams.DiagramNode]'. Path 'nodes', line 1, position 13.

 ---> System.ArgumentException: Could not cast or convert from System.String to System.Collections.ObjectModel.ObservableCollection`1[Syncfusion.Blazor.Diagrams.DiagramNode].

   at Newtonsoft.Json.Utilities.ConvertUtils.EnsureTypeAssignable(Object value, Type initialType, Type targetType)

   at Newtonsoft.Json.Utilities.ConvertUtils.ConvertOrCast(Object initialValue, CultureInfo culture, Type targetType)

   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.EnsureType(JsonReader reader, Object value, CultureInfo culture, JsonContract contract, Type targetType)

   --- End of inner exception stack trace ---

   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.EnsureType(JsonReader reader, Object value, CultureInfo culture, JsonContract contract, Type targetType)

   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.SetPropertyValue(JsonProperty property, JsonConverter propertyConverter, JsonContainerContract containerContract, JsonProperty containerProperty, JsonReader reader, Object target)

   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.PopulateObject(Object newObject, JsonReader reader, JsonObjectContract contract, JsonProperty member, String id)

   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateObject(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue)

   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize(JsonReader reader, Type objectType, Boolean checkAdditionalContent)

   at Newtonsoft.Json.JsonSerializer.DeserializeInternal(JsonReader reader, Type objectType)

   at Newtonsoft.Json.JsonConvert.DeserializeObject(String value, Type type, JsonSerializerSettings settings)

   at Syncfusion.Blazor.BaseComponent.ChangeType(Object value, Type conversionType, Boolean isClientChange)

   at Syncfusion.Blazor.BaseComponent.UpdateComponentModel(Dictionary`2 properties, BaseComponent parentObject, Boolean isAutoInitialized)

   at Syncfusion.Blazor.BaseComponent.UpdateModel(Dictionary`2 properties)

    at Object.endInvokeDotNetFromJS (https://localhost:44333/_framework/blazor.server.js:8:31660)

    at e.<anonymous> (https://localhost:44333/_framework/blazor.server.js:8:103446)

    at https://localhost:44333/_framework/blazor.server.js:1:19202

    at Array.forEach (<anonymous>)

    at e.invokeClientMethod (https://localhost:44333/_framework/blazor.server.js:1:19173)

    at e.processIncomingData (https://localhost:44333/_framework/blazor.server.js:1:17165)

    at e.connection.onreceive (https://localhost:44333/_framework/blazor.server.js:1:10276)

    at WebSocket.i.onmessage (https://localhost:44333/_framework/blazor.server.js:1:38091)

[Aravind Ravi]

Hi Scott, 

We are validating your requirements and update you with more details on May 15^th 2020. 

Regards 

Aravind Ravi 

[Aravind Ravi]

Hi Scott, 

We have fixed the reported issue in our latest version(18.1.52). So could you please upgrade your version to our latest version (18.1.52). We have attached a video demonstration that while drag and drop the nodes from palette to diagram no console exception occurs. 

Video: https://www.syncfusion.com/downloads/support/forum/154220/ze/LAYOUT~16267297 

Regards 

Aravind Ravi