StaffPerformance/wispro.sp.web/Components/PositionSelect.razor

<Select DataSource="@_allPositions"
        DefaultValue="@PositionId"
        LabelName="@nameof(wispro.sp.entity.Position.Name)"
        ValueName="@nameof(wispro.sp.entity.Position.Id)"
        Style="width: 200px"
        Placeholder="选择一个职位"
        IgnoreItemChanges="false"
        AllowClear
        OnSelectedItemChanged="OnSelectedItemChangedHandler">
</Select>