如何计算IEnumerable中出现的次数

Question

我的剃刀页面中有这个IEnumerable方法。

@if (Orders.Any())
{
<table class="table table-bordered">
<thead>

<th>Driver Name</th>
<th>Delivery Orders</th>
</thead>
<tbody>
@foreach(var objOrders in Orders)
{
<tr>
<th>
@objOrders.Driver.UserName
</th>
<th>
@objOrders.Driver.FullName.Count()
</th>
<td>
</td>
</tr>
}
</tbody>
</table>
}

哪个是

private IEnumerable<OrderDTO> Orders { get; set; } = new List<OrderDTO>();
private bool IsLoading { get; set; } = true;
public async Task SearchDate()
{
Orders =  await _orderRepository.GetDate(DateValue);
}
private async Task LoadOrders()
{
IsLoading=true;
StateHasChanged();
await SearchDate();

//Orders = await _orderRepository.GetDate(date);
IsLoading = false;
StateHasChanged();
}

在这里

public async Task<IEnumerable<OrderDTO>> GetDate(DateTime date)
{
if (date != null)
{
return _mapper.Map<IEnumerable<Order>, IEnumerable<OrderDTO>>
((IEnumerable<Order>)_db.Orders.Where(u => u.DeliveryDate == date));
}
else
{
return _mapper.Map<IEnumerable<Order>, IEnumerable<OrderDTO>>(_db.Orders);
}
}

目前，显示器有点像

|Driver Name          | Number Delivery Orders |
| :---                |    :----:   | 
| 1                   | 1  |
| 1                   | 1  |
| 2                   | 1  |
|Kim1                 | 4  |

我想像这个一样显示

|Driver Name          | Number Delivery Orders |
| :---                |    :----:   | 
| 1                   | 2 (Occurrences)  |
| 2                   | 1 (Occurrences)  |
|Kim1                 | 1 (Occurrences)  |

我知道现在Count()方法正在计算驱动程序名称的长度，但我如何对其进行编码，使其返回出现的驱动程序名称。

谢谢大家。

Answer 1

@foreach(var objOrders in Orders
.GroupBy(u => u.Driver.FullName)
.Select(group => new {
Count= group.Count(),
Key=group.Key }
)
)

设法做到这一点。感谢@Martin Costello