如果GUID為空，則模型綁定不起作用

Question

在以下代碼片段中，當我使用正文發出POST請求時，ExpenseRecord對象始終為null： {"id":null,"name":"Test","reason":"Flight","date":"01.10.2016","amount":10,"text":"Test"}

[HttpPost]
public IActionResult Post([FromBody]ExpenseRecord record)
{
    try
    {
        this.repository.Create(record);
        return this.Created($"api/expenses/{record.Id}", null);
    }
    catch (ArgumentNullException)
    {
        return this.BadRequest();
    }
    catch (InvalidOperationException)
    {
        return new StatusCodeResult((int)HttpStatusCode.Conflict);
    }
 }

ExpenseRecord看起來像：

public class ExpenseRecord : IEquatable<ExpenseRecord>
{
    public Guid Id { get; set; }

    public string Date { get; set; }

    public string Name { get; set; }

    [JsonConverter(typeof(StringEnumConverter))]
    public ExpenseReason Reason { get; set; }

    public decimal Amount { get; set; }

    public string Text { get; set; }

    ...
}

如果將ID設置為適當的格式GUID，則可以使用。 但是，發布新記錄時，我不能（或不想）提供ID？

Answer 1

如前所述，guid不能為null。

// change
public Guid Id { get; set; }

// to
public Guid? Id { get; set; }

或在您的POST中發送空的Guid