System.Data.SqlClient.SqlException:无法将值NULL插入AspnetCore Web Api的列中

我正在AspNetCore中创建web api。我想在sql Server中设置默认日期时间值。下面是创建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);
        }

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;
            }
        }

但是我在向表中插入数据时遇到以下异常

{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)

{Microsoft.EntityFrameworkCore.DbUpdateException:更新条目时出错。有关详细信息，请参阅内部异常。-->System.Data.SqlClient.SqlException:无法将值NULL插入到“CreatedDate”列、表“AasthaSales.dbo.tblPartyAddress”中；列不允许NULL。插入失败。
声明已终止。
在System.Data.SqlClient.SqlCommand.c.b\u 108\u 0（任务'1结果）
位于System.Threading.Tasks.ContinuationResultTaskFromResultTask`2.InnerInvoke（）
在System.Threading.ExecutionContext.Run（ExecutionContext ExecutionContext，ContextCallback回调，对象状态）
位于System.Threading.Tasks.Task.ExecuteWithThreadLocal（Task和currentTaskSlot）
---来自引发异常的上一个位置的堆栈结束跟踪---
在System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）中
在System.Runtime.CompilerServices.TaskWaiter.HandleNonSuccessAndDebuggerNotification（任务任务）中
在Microsoft.EntityFrameworkCore.Storage.Internal.RelationalCommand.d_u17.MoveNext（）中
---来自引发异常的上一个位置的堆栈结束跟踪---
在System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）中
在System.Runtime.CompilerServices.TaskWaiter.HandleNonSuccessAndDebuggerNotification（任务任务）中
在Microsoft.EntityFrameworkCore.Update.ReaderModificationCommandBatch.d_u32.MoveNext（）中
---内部异常堆栈跟踪的结束---
在Microsoft.EntityFrameworkCore.Update.ReaderModificationCommandBatch.d_u32.MoveNext（）中
---来自引发异常的上一个位置的堆栈结束跟踪---
在System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）中
在System.Runtime.CompilerServices.TaskWaiter.HandleNonSuccessAndDebuggerNotification（任务任务）中
在Microsoft.EntityFrameworkCore.Update.Internal.BatchExecutor.d_u10.MoveNext（）中
---来自引发异常的上一个位置的堆栈结束跟踪---
在System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）中
在System.Runtime.CompilerServices.TaskWaiter.HandleNonSuccessAndDebuggerNotification（任务任务）中
在Microsoft.EntityFrameworkCore.Storage.Internal.SqlServerExecutionStrategy.d_u7`2.MoveNext（）中
---来自引发异常的上一个位置的堆栈结束跟踪---
在System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）中
在System.Runtime.CompilerServices.TaskWaiter.HandleNonSuccessAndDebuggerNotification（任务任务）中
在Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.d_u61.MoveNext（）中
---来自引发异常的上一个位置的堆栈结束跟踪---
在System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）中
在System.Runtime.CompilerServices.TaskWaiter.HandleNonSuccessAndDebuggerNotification（任务任务）中
在Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.d_u59.MoveNext（）中
---来自引发异常的上一个位置的堆栈结束跟踪---
在System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）中
在System.Runtime.CompilerServices.TaskWaiter.HandleNonSuccessAndDebuggerNotification（任务任务）中
在Microsoft.EntityFrameworkCore.DbContext.d_u48.MoveNext（）中
---来自引发异常的上一个位置的堆栈结束跟踪---
在System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）中
在System.Runtime.CompilerServices.TaskWaiter.HandleNonSuccessAndDebuggerNotification（任务任务）中

如果有人有疑问，请随时询问

---

任何帮助都将不胜感激。

一个可空的

DateTime

显然会映射到一个允许空的列，因此唯一可能的解释是，在某些情况下，它不是

DateTime？

而您将其设置为一个，或者您在它上面有

Required

属性并将其删除。在任何情况下，您都需要执行一个新的操作迁移以将这些更改传播回数据库

但是，对于此特定场景，类似于

CreatedDate

属性的内容应该是不可为空的，并且只有一个默认设置：

public DateTime CreatedDate { get; set; } = DateTime.UtcNow;

public DateTime CreatedDate { get; set; } = DateTime.UtcNow;