I am trying to fully understand how I can simplify the following:
public ActionResult Create(string ds) {
InitializeServices(ds, "0000");
vm.Account = new Account {
PartitionKey = "0000",
RowKey = "0000",
Created = DateTime.Now,
CreatedBy = User.Identity.Name
};
}
catch (ServiceException ex) {
ModelState.Merge(ex.Errors);
}
catch (Exception e) {
Trace.Write(e);
ModelState.AddModelError("", "Database access error: " + e.Message);
}
return View("CreateEdit", vm);
}
I had a few great answers and the following was suggested:
private void HandleException(Action action) {
try {
action();
}
catch (ServiceException ex) {
ModelState.Merge(ex.Errors);
}
catch (Exception e)
{
Trace.Write(e);
ModelState.AddModelError("", "Database access error: " + e.Message);
}
}
RunAndHandleExceptions(new Action(() =>
{
//Do some computing }
));
This looks like a really great solution but I still don't understand how I can pass in my parameters into the action. What I need to do is to pass in the following:
string ds
System.Web.Mvc.ModelState ModelState (passed as a reference)
Just
HandleException(() => someFunction(ds, ModeState));
should do it
To get the return value, you need a Func<>
, not Action<>
:
private TR HandleException<TR>(Func<TR> action)
{
try
{
return action();
}
catch (ServiceException ex)
{
ModelState.Merge(ex.Errors);
}
catch (Exception e)
{
Trace.Write(e);
ModelState.AddModelError("", "Database access error: " + e.Message);
}
return default(TR); // null for reference types
}
You then would use it, eg without an existing function:
bool result = HandleException(() =>
{
if (string.IsNullOrEmpty(ds))
return false;
// do interesting stuff that throws many kinds of exceptions :)
// Note: freely use ds and ModelState from surrounding scope,
// no need to 'pass them'
return true;
});
You can define an action with up to 16 parameters (no discussion, if that number is useful, please). So, sour call could look like:
private void HandleException(Action<string, System.Web.Mvc.ModelState ModelState > action) {
Edit
Here is an example with an action having parameter:
private void RunHandleException(Action<int> action)
{
action(someIntValue);
}
...
RunAndHandleExceptions((someInt) =>
{
//Do some computing
});
And here is an example with a function having a return value:
private void RunHandleException(Func<bool, int> action)
{
bool returnValue = action(someIntValue);
}
...
RunAndHandleExceptions((someInt) =>
{
//Do some computing
return true;
});
你看过RedirectToAction了吗?
return this.RedirectToAction(c => c.SomeAction(MyParam));
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