我爲一個實體使用CustomValidation,並且我想在其中注入Repository。驗證方法必須是靜態的。有什麼方法可以在服務位置以外的靜態上下文中注入對象?如何在自定義驗證器中注入某些東西?
這裏是我的元數據:
[MetadataTypeAttribute(typeof(BillPosition.BillPositionsMetadata))]
[CustomValidation(typeof(BillPositionValidator), "ValidateBillPositionsCount")]
public partial class BillPosition
{
internal sealed class BillPositionsMetadata
{
private BillPositionsMetadata() { }
public int BillId { get; set; }
}
}
這裏的驗證碼:
public class BillValidator
{
[Inject]
public static IRepository Repository { get; set; }
public static ValidationResult ValidateBillPositionsCount(BillPosition bill, ValidationContext context)
{
ValidationResult result = ValidationResult.Success;
/* Repository wasn't injected and I get null reference exception */
var billPositions = Repository.BillPositions.Count(position => position.BillId == bill.BillId);
if (bill.BillPositions.Count == 0 && billPositions == 0)
{
result = new ValidationResult("Invalid positions count", new[] { "BillPositions" });
}
return result;
}
}