在我的控制器中,我有行动
[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();
}
Mi问题是当我使用Async DeleteConfirmed操作时,在Delete方法中我收到错误:
对象引用未设置为对象的实例。
代表
HttpContext.Current.User.Identity.Name
另一方面,当我使用同步动作时:
[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
不会返回任何错误。
仅对Delete操作发生此问题。它适用于编辑操作(甚至是异步)。
答案 0 :(得分:1)
您还可以考虑在async
调用之前抓取用户,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();
}