This JsonSerializerOptions instance is read-only or has already been used in serialization or deserialization.
I have upgraded the Syncfusion Nuget package to 24.2.8 but I am still getting an error. I have a field in my table that is nullable (InventoryItemId) and also a foreign key to a related table (InventoryItem). If I edit an existing record where this field is null and save it without making any changes, InventoryItemId is still null but there is a newly instantiated record assigned to InventoryItem and EF is trying to add this new record to the database. Here is the record from the database before the Patch method is called in my OData controller.
Here is the record after the Patch method has been called. Note that the InventoryItemId is still null but there is a record assigned to the InventoryItem property. The InventoryItem property should also be null.
And here is the InventoryItem property expanded. Note that it is a newly instantiated record with invalid values. EF is trying to add this record to the database.
Here is the GridColumn declaration for the InventoryItemId field.
<GridColumn Field="InventoryItem.SerialNumber"
HeaderText="Serial Number"
Width="@(inventoryItem == null ? "200px" : "0px")">
<EditTemplate>
@{
var repair = (Repair)context;
}
<SfDropDownList TValue="int?"
TItem="InventoryItem"
@bind-Value="@repair.InventoryItemId"
Placeholder="Serial Number"
FloatLabelType="FloatLabelType.Always"
AllowFiltering="true"
SortOrder="Syncfusion.Blazor.DropDowns.SortOrder.Ascending"
FilterType="Syncfusion.Blazor.DropDowns.FilterType.StartsWith">
<DropDownListFieldSettings Text="@nameof(InventoryItem.SerialNumber)"
Value="@nameof(InventoryItem.InventoryItemId)" />
<SfDataManager Url="odata/InventoryItems"
Adaptor="Adaptors.ODataV4Adaptor"
HttpClientInstance="@httpClient"
Key="@nameof(InventoryItem.InventoryItemId)" />
</SfDropDownList>
</EditTemplate>
</GridColumn>
Thanks,
Craig
