Blazor Radzen DataGrid 自定义过滤未处理异常

Question

我有一个包含三列的 Radzen DataGrid：名字、姓氏和服务协调员。我希望服务协调员列具有复选框过滤功能。我参考了文档并尝试调整他们的代码来解决这个问题；但是，每当我与表交互时，我都会遇到未处理的异常。

@page "/"
...
@using Radzen;
@using Radzen.Blazor;

<h2>Manage Employee</h2>

<RadzenDataGrid Data="@EmployeeRecords" TItem="ChildRecord"
                AllowSorting="true" AllowPaging="true" PageSize="10" AllowFiltering="true" FilterMode="FilterMode.Simple">
    <Columns>
        <RadzenDataGridColumn TItem="EmployeeRecord" Property="Name.FirstName" Title="First Name" />
        <RadzenDataGridColumn TItem="EmployeeRecord" Property="Name.LastName" Title="Last Name" />
        <RadzenDataGridColumn TItem="EmployeeRecord" Property="ServiceCoordinator" Title="Customer"
                              FilterOperator="FilterOperator.Contains" LogicalFilterOperator="LogicalFilterOperator.Or">
            <FilterTemplate>
                <RadzenDropDown @bind-Value=@selectedServiceCoordinators Style="width:100%;"
                                Change=@OnSelectedServiceCoordinatorsChange Data="@(serviceCoordinators)" AllowClear="true" Multiple="true" />
            </FilterTemplate>
        </RadzenDataGridColumn>
    </Columns>
</RadzenDataGrid>

@code {
    List<string> selectedServiceCoordinators;
    List<string> serviceCoordinators = new List<string>();

    EmployeeRecord employeeRecord = new EmployeeRecord();
    List<EmployeeRecord> EmployeeRecords = new List<EmployeeRecord>();

    protected override async Task OnInitializedAsync() {
        GetEmployeeRecords();
        UpdateServiceCoordinators();
    }
    private void GetEmployeeRecords() {
        EmployeeRecords = EmployeeRecordService.EmployeeRecords();
    }
    private void UpdateServiceCoordinators() {
        foreach (EmployeeRecord c in EmployeeRecords) {
            serviceCoordinators.Add(c.ServiceCoordinator);
        }
    }
    void OnSelectedServiceCoordinatorsChange(object value) {
        if (selectedServiceCoordinators != null && !selectedServiceCoordinators.Any()) {
            selectedServiceCoordinators = null;
        }
    }
}

我相信

selectedServiceCoordinator

没有正确更新，但我不确定是否要纠正这个错误，因为我依赖于 Radzen 的内部实现。