[英]MVC EF6 Async delete
在我的控制器中,我有动作
[HttpPost, ActionName("Delete")]
[ValidateAntiForgeryToken]
public async Task<ActionResult> DeleteConfirmed(int id)
{
clsHost HostDAL = new clsHost();
vw_Host vw_host = await HostDAL.GetByIdAsync(id);
string actionStatus = HostDAL.Delete(vw_host);
TempData["msgHost"] = actionStatus;
return RedirectToAction("Display");
}
删除方法:
public string Delete(vw_Host host)
{
ObjectParameter executionStatus = new ObjectParameter("ExecutionStatus", "");
try
{
using (Entities context = new Entities())
{
string name = HttpContext.Current.User.Identity.Name.ToString();
context.sp_Host_Delete(host.ID, HttpContext.Current.User.Identity.Name.ToString(), executionStatus);
context.SaveChanges();
}
}
catch (Exception ex)
{
using (Entities context = new Entities())
{
context.sp_LogError(this.GetType().Name.ToString() + "." + System.Reflection.MethodBase.GetCurrentMethod().Name.ToString(), ex.Message, HttpContext.Current.User.Identity.Name);
context.SaveChanges();
}
executionStatus.Value = "Error occured. Please contact to Administrator";
}
return executionStatus.Value.ToString();
}
我的问题是,当我使用 Async DeleteConfirmed 操作时,在 Delete 方法中出现错误:
你调用的对象是空的。
为了
HttpContext.Current.User.Identity.Name
另一方面,当我使用同步操作时:
[HttpPost, ActionName("Delete")]
[ValidateAntiForgeryToken]
public ActionResult DeleteConfirmed(int id)
{
clsHost HostDAL = new clsHost();
vw_Host vw_host = HostDAL.GetById(id);
string actionStatus = HostDAL.Delete(vw_host);
TempData["msgHost"] = actionStatus;
return RedirectToAction("Display");
}
一切正常, HttpContext.Current.User.Identity.Name
没有返回错误。 只有删除操作才会出现此问题。 它适用于编辑操作(甚至是异步操作)。
您还可以考虑在async
调用之前获取用户并将其作为参数传递给 delete 方法。
[HttpPost, ActionName("Delete")]
[ValidateAntiForgeryToken]
public async Task<ActionResult> DeleteConfirmed(int id) {
var name = "Unknown";
try {
name = HttpContext.Current.User.Identity.Name.ToString();
}catch { }
clsHost HostDAL = new clsHost();
vw_Host vw_host = await HostDAL.GetByIdAsync(id);
string actionStatus = HostDAL.Delete(vw_host, name);
TempData["msgHost"] = actionStatus;
return RedirectToAction("Display");
}
重构的删除方法
public string Delete(vw_Host host, string name) {
ObjectParameter executionStatus = new ObjectParameter("ExecutionStatus", "");
try {
using (Entities context = new Entities()) {
context.sp_Host_Delete(host.ID, name, executionStatus);
context.SaveChanges();
}
} catch (Exception ex) {
using (Entities context = new Entities()) {
context.sp_LogError(this.GetType().Name.ToString() + "." + System.Reflection.MethodBase.GetCurrentMethod().Name.ToString(), ex.Message, name);
context.SaveChanges();
}
executionStatus.Value = "Error occured. Please contact to Administrator";
}
return executionStatus.Value.ToString();
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.