我使用Entity Framework 4.0. SaveChanges()可能返回0但不会引发异常？例如,添加后.
这是我的代码：
try
{
_context.CodeProducts.Add(entity);
_context.SaveChanges();
//Shell I control return result from SaveChanges() in here.
//However doesn't throw an exceoption?
return new MethodResponse()
{
ResultText = "Successful",Type = MethodResponse.ResponseType.Succeed
};
}
catch (OptimisticConcurrencyException exc)
{
throw exc;
}
catch (UpdateException exc)
{
throw exc;
}
catch (Exception exc)
{
throw exc;
}
解决方法
根据
the documentation,DbContext.SaveChanges的返回值为
The number of objects written to the underlying database.
所以你看到的只有在没有实体需要保存到数据库的时候才可能.
