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System.Runtime.Serialization.InvalidDataContractException when trying to serialize grid (with SerializeColumns to true)

Hi, if I try to serialize a SFGrid, with parameter "SerializeColumns" equals to two, this exception is generated:

'Type 'System.RuntimeType' cannot be serialized. Consider marking it with the DataContractAttribute attribute, and marking all of its members you want serialized with the DataMemberAttribute attribute. Alternatively, you can ensure that the type is public and has a parameterless constructor - all public members of the type will then be serialized, and no attributes will be required.'
The class code is as follows:

    /// <summary>
    /// </summary>
    public class ItemSz
        public ItemSz(Item item, IObjectSpace objSpace)
            ObjSpace = objSpace;
            Item = item;
            Oid = item.Oid;
            Id = item.Id;
            Barcode = item.Barcode;
            CreationDate= item.CreationDate;
            PurchasePrice = item.PurchasePrice;

        private IObjectSpace _objSpace;
        public IObjectSpace ObjSpace
            get => _objSpace;
            set => _objSpace = value;

        private Item _item;
        public Item Item
            get => _item;
            set => _item = value;

        private Guid _oid;
        public Guid Oid
            get => _oid;
            set => _oid = value;

        private string _id;
        public string Id
            get => _id;
            set => _id = value;

        private string _barcode;
        public string Barcode
            get => _barcode;
            set => _barcode = value;

        private DateTime _creationDate;
        public DateTime CreationDate
            get => _creationDate;
            set => _creationDate = value;

        private decimal _purchasePrice;
        public decimal PurchasePrice
            get => _purchasePrice;
            set => _purchasePrice = value;


6 Replies

VD Vasanthkumar Durairaj Syncfusion Team December 19, 2022 03:40 PM UTC

Hi Saverio,

We are currently checking your reported issue with the provided information. We will update you with further details on
December 22, 2022.

VD Vasanthkumar Durairaj Syncfusion Team December 22, 2022 02:33 PM UTC

Hi Saverio,

Based on the provided information, we have prepared the sample, but we are unable to replicate the reported issue from our end.

Find the tested sample.

If the issue persists, share us the below things.     

1. You are using DataContractAttribute to the Data class, can you specify the use for this?
      How you are using this in serialization, and if possible, share the video demonstration.

        2. Can you share serialization related code snippets?

        3. If possible, modify the attached to reproduce the issue and provide a video illustration of the reported issue.

It will be more helpful for us to check the possibilities for resolving the reported problem.

Attachment: WF_SfDataGrid_976a0030.zip

SA Saverio replied to Vasanthkumar Durairaj December 26, 2022 05:48 PM UTC


I found the source of the problem.

I have used the property "ColumnMemberType" for some of my columns, for example,

ColumnMemberType = typeof(string)

in a GridTextColumn.

I don't know why, and I'd be interested to know, but removing that line of code the exception is no longer thrown.

I would report this as a bug, unless you have an explanation why it happens.

VS Vijayarasan Sivanandham Syncfusion Team December 27, 2022 02:02 PM UTC


We are currently checking your reported scenario with the provided information. We will update you with further details on December 29, 2022.

VS Vijayarasan Sivanandham Syncfusion Team December 28, 2022 05:17 PM UTC


We have created a bug report for the reported issue “RuntimeType not support exception occurs when ColumnMemberType is defined in GridColumn while serialize”. We will fix this issue and include it in our upcoming Weekly NuGet release scheduled for January 17, 2023.

You can track the status of this report through the following feedback link,

Feedback Link: https://www.syncfusion.com/feedback/40091/runtimetype-not-support-exception-occurs-when-columnmembertype-is-defined-in

Note: The provided feedback link is private, and you need to login to view this feedback.

VS Vijayarasan Sivanandham Syncfusion Team January 18, 2023 02:24 PM UTC


We are pleased to inform you that we have resolved the issue of an exception occurring while serializing a System.RunTimeType property that was reported. However, we have identified a framework-level issue that occurs while deserializing the System.RunTimeType property. We have created a query on GitHub to address this issue.

GitHub Link: https://github.com/dotnet/runtime/issues/80590

We will update you with details once we get the solution from GitHub. We appreciate your patience until then.

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