我正尝试使用实体框架将数据从ASP.Net Web API应用程序插入到数据库中。但我得到一个例外:不能使用实体框架插入数据
An exception of type 'System.Data.Entity.Infrastructure.DbUpdateException' occurred in EntityFramework.dll but was not handled in user code.
当该方法激发时发生异常db.SaveChanges(); 这里是POST方法的代码:
public HttpResponseMessage PostTransaction(Transaction transaction)
{
if (ModelState.IsValid)
{
// db.Entry(transaction).State = EntityState.Added;
db.Transactions.Add(transaction);
try
{
db.SaveChanges();
}
catch (DbUpdateConcurrencyException)
{
return Request.CreateResponse(HttpStatusCode.NotFound);
}
HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.Created, transaction);
response.Headers.Location = new Uri(Url.Link("DefaultApi", new { id = transaction }));
return response;
}
else
{
return Request.CreateResponse(HttpStatusCode.BadRequest);
}
}
这里是模型:
public partial class Transaction
{
public int TrnID { get; set; }
public string TrnSubject { get; set; }
public int TrnCategoryID { get; set; }
public DateTime TrnDate { get; set; }
public int TrnAccount { get; set; }
public bool TrnType { get; set; }
public decimal TrnAmount { get; set; }
}
错误消息是什么做,如果你调试你?什么是不更新的原因? –
你不是想编辑已有的项目吗?如果是,那么你应该在实际更新之前调用** Attach **。 –
我试图插入新项目 – MohamedAbbas