我在AspNetCore中创建web api。我想在sql Server中设置默认的DateTime值。以下是创建Web Api的方法。
控制器：
[HttpPost]
[Route("Insert/PartyAddress")]
public async Task<IActionResult> PostPartyAddressAsync([FromBody] PartyAddress partyAddress)
{
if (!ModelState.IsValid)
return BadRequest(ModelState);
var result = await _repo.PostPartyAddressAsync(partyAddress);
return Ok(result);
}
存储库逻辑：
public async Task<bool> PostPartyAddressAsync(PartyAddress partyAddress)
{
try
{
TblPartyAddress tblPartyAddress = new TblPartyAddress();
tblPartyAddress.PartyId = partyAddress.PartyId;
tblPartyAddress.AddressLine1 = partyAddress.AddressLine1;
tblPartyAddress.AddressLine2 = partyAddress.AddressLine2;
tblPartyAddress.Pincode = partyAddress.Pincode;
tblPartyAddress.City = partyAddress.City;
tblPartyAddress.State = partyAddress.State;
tblPartyAddress.Country = partyAddress.Country;
tblPartyAddress.PersonName = partyAddress.PersonName;
tblPartyAddress.Email = partyAddress.Email;
tblPartyAddress.ContactNo = partyAddress.ContactNo;
tblPartyAddress.IsDefault = partyAddress.IsDefault;
tblPartyAddress.IsActive = partyAddress.IsActive;
await ctx.Context.tblPartyAddresses.AddAsync(tblPartyAddress);
ctx.Context.Entry(tblPartyAddress).State = EntityState.Added;
await ctx.Context.SaveChangesAsync();
return true;
}
catch (Exception ex)
{
return false;
}
}
映射类
[Table("tblPartyAddress")]
public class TblPartyAddress
{
[Key]
[Column("Id")]
[Required]
public int Id { get; set; }
[Column("PartyId")]
[Required]
public int PartyId { get; set; }
[Column("AddressLine1")]
[Required]
public string AddressLine1 { get; set; }
[Column("AddressLine2")]
public string AddressLine2 { get; set; }
[Column("Pincode")]
[MaxLength(50)]
[Required]
public string Pincode { get; set; }
[Column("City")]
[MaxLength(50)]
public string City { get; set; }
[Column("State")]
[MaxLength(50)]
public string State { get; set; }
[Column("Country")]
[MaxLength(50)]
public string Country { get; set; }
[Column("PersonName")]
[MaxLength(50)]
[Required]
public string PersonName { get; set; }
[Column("Email")]
[MaxLength(50)]
[Required]
public string Email { get; set; }
[Column("ContactNo")]
[MaxLength(20)]
[Required]
public string ContactNo { get; set; }
[Column("IsDefault")]
[Required]
public bool IsDefault { get; set; }
[Column("IsActive")]
[Required]
public bool IsActive { get; set; }
[Column("CreatedDate")]
public DateTime? CreatedDate { get; set; }
[Column("ModifiedDate")]
public DateTime? ModifiedDate { get; set; }
}
但是我在将数据插入表中时遇到以下异常。
{Microsoft.EntityFrameworkCore.DbUpdateException: An error occurred while updating the entries. See the inner exception for details. ---> System.Data.SqlClient.SqlException: Cannot insert the value NULL into column 'CreatedDate', table 'AasthaSales.dbo.tblPartyAddress'; column does not allow nulls. INSERT fails.
The statement has been terminated.
at System.Data.SqlClient.SqlCommand.<>c.<ExecuteDbDataReaderAsync>b__108_0(Task`1 result)
at System.Threading.Tasks.ContinuationResultTaskFromResultTask`2.InnerInvoke()
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot)
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.EntityFrameworkCore.Storage.Internal.RelationalCommand.<ExecuteAsync>d__17.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.EntityFrameworkCore.Update.ReaderModificationCommandBatch.<ExecuteAsync>d__32.MoveNext()
--- End of inner exception stack trace ---
at Microsoft.EntityFrameworkCore.Update.ReaderModificationCommandBatch.<ExecuteAsync>d__32.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.EntityFrameworkCore.Update.Internal.BatchExecutor.<ExecuteAsync>d__10.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.EntityFrameworkCore.Storage.Internal.SqlServerExecutionStrategy.<ExecuteAsync>d__7`2.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.<SaveChangesAsync>d__61.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.<SaveChangesAsync>d__59.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.EntityFrameworkCore.DbContext.<SaveChangesAsync>d__48.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
如果有人有疑问，请随时提出。
任何帮助都会得到赞赏。
答案 0 :(得分：0)
可以为空的DateTime显然会映射到允许空值的列，所以唯一可能的解释是，在某些时候它是不是 a DateTime?而你使它成为一个或你有Required属性并删除它。在任何一种情况下，您都需要执行新的迁移以将这些更改传播回数据库。
但是，对于此特定情况，类似CreatedDate属性的内容应该不可为空并且只有一个默认集：
public DateTime CreatedDate { get; set; } = DateTime.UtcNow;