/// <summary>
/// 更新课程
/// </summary>
/// <param name="courseId"></param>
/// <param name="dto"></param>
/// <returns></returns>
public async Task <(bool sucess, string errMessage)> UpdateCourseAsync(AddOrUpdateCourseDto dto)
{
//先判断用户是不是存在了课程
var course = await db.Courses.FirstOrDefaultAsync(e => e.Id == dto.Id && e.UserId == dto.UserId);
if (course == null)
{
return(false, "不存在该课程");
}
course.Desc = dto.Desc;
course.Name = dto.Name;
course.LastModifyDatetime = DateTime.UtcNow;
try
{
int row = await db.SaveChangesAsync();
return(row > 0, null);
}
catch (Exception ex)
{
return(false, ex.InnerException?.Message ?? ex.Message);
}
}
private async Task <(bool sucess, string errMessage)> AddCourseAsync(AddOrUpdateCourseDto dto)
{
//先判断用户是不是存在了课程名称
bool existCourse = await db.Courses.AnyAsync(e => e.UserId == dto.UserId && e.Name == dto.Name);
if (existCourse)
{
return(false, "添加课程失败，已经存在了该课程");
}
var now = DateTime.UtcNow;
var id = Guid.NewGuid().ToString("N");
await db.Courses.AddAsync(new Course {
Id = id,
Desc = dto.Desc,
AddDateTime = now,
UserId = dto.UserId,
Name = dto.Name,
LastModifyDatetime = now
});
int rows = await db.SaveChangesAsync();
return(rows > 0, null);
}
/// <summary>
/// 添加或者更新课程
/// </summary>
/// <param name="dto"></param>
/// <returns></returns>
public async Task <Result> AddOrUpdateCourseAsync(AddOrUpdateCourseDto dto)
{
(bool sucess, string errMessage)result;
if (string.IsNullOrEmpty(dto.Id))
{
result = await AddCourseAsync(dto);
}
else
{
result = await UpdateCourseAsync(dto);
}
return(new Result {
Succeeded = result.sucess, ErrorMessage = result.errMessage
});
}
public async Task <IActionResult> OnPost(AddOrUpdateCourseDto AddOrUpdateCourseDto)
{
if (!TryValidateModel(AddOrUpdateCourseDto))
{
return(BadRequest(ModelState));
}
var result = await CourseService.AddOrUpdateCourseAsync(AddOrUpdateCourseDto).ConfigureAwait(false);
if (!result.Succeeded)
{
ModelState.AddModelError(string.Empty, result.ErrorMessage);
return(BadRequest(ModelState));
}
return(Content("/Teacher/Course/CourseList"));
}
public async Task <IActionResult> OnGetAsync([ModelBinder(Name = "CourseId")] CourseDto course)
{
if (course != null)
{
AddOrUpdateCourseDto = new AddOrUpdateCourseDto
{
Desc = course.Desc,
Id = course.Id,
Name = course.Name,
UserId = course.UserId
};
}
else
{
AddOrUpdateCourseDto = new AddOrUpdateCourseDto
{
UserId = CurUserId
};
}
return(Page());
}