dynamic

问题 I have a situation where it would be nice to be able to have a catch block where the type of the Exception is determined at run time. It would work something like this: $someClassName = determineExceptionClass(); try { $attempt->something(); } catch ($someClassName $e) { echo 'Dynamic Exception'; } catch (Exception $e) { echo 'Default Exception'; } Is this at all possible? 回答1: That doesn't work as far as I'm aware. You could mimic that functionality with a control statement like this:

问题 I define a com object as a dynamic type in c# I am able to call methods quite easily. However when I try to access a property on the same object I get an invalid cast exception. The object in question is an array, passed to managed code from JavaScript, and I wish to get the length property of it as an int. I know I am missing something odd because I am not getting a 'does not contain a definition' exception and I can access the property easily using reflection/InvokeMember. Why can I not

问题 This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center. Closed 7 years ago . I'm trying to build a report that would be smart enough to modify slightly its sql query based on an input parameter of some sort. For example if that

问题 I have been playing with Core Plot and trying to create a dynamic date x-axis. From the date plot example I have managed to create a static date axis, but would like to create a two-minute window at any time and update the xRange values. I am not sure on how to pass dates as the xRange min and length values and display time on the x-axis. I have looked at examples, but I haven't been able to utilize NSTimeInterval (if this is how to do it...). Below is the picture (if it helps) Below is my

问题 I'm making a matriz multiplication program in OpenMPI, and I got this error message: [Mecha Liberta:12337] *** Process received signal *** [Mecha Liberta:12337] Signal: Segmentation fault (11) [Mecha Liberta:12337] Signal code: Address not mapped (1) [Mecha Liberta:12337] Failing at address: 0xbfe4f000 -------------------------------------------------------------------------- mpirun noticed that process rank 1 with PID 12337 on node Mecha Liberta exited on signal 11 (Segmentation fault). ----

问题 I create dynamically a Userform with comboboxes and textboxes. one of each per row. The user will choose how many lines he wants. So far I can adjust the size of the Userform according to the number of rows and create the first row. But an error occurred for the second row: Run-time error '-2147221005(800401f3)': Invalid Class String The result is Userform generated Here is my code. to simplify I allocated the row variable to Nb=3 Public Sub CommandButton2_Click() Dim Nb As Integer 'Nb =

问题 I have table data, select * from tbltaxamount ; id | taxname | taxinfoid | taxvalue | taxamt | zoneid | invoiceid | transid ----+-------------+-----------+----------+--------+--------+-----------+--------- 1 | Service Tax | 0 | 0.00 | 28.69 | 2 | 119 | -1 2 | ABC Tax | 0 | 0.00 | 25.78 | 2 | 119 | -1 Now, how can I get the result as below using any function of PostgreSQL? invoiceid | Service Tax | ABC Tax ----------+-------------+-------- 119 | 28.69 | 25.78 回答1: Your solution is a viable way

问题 I'm trying to put different images (.jpg , .png) dynamically into a ListView from r es/drawable . The names from the images I get from a database. The images themselves are in the res/drawable folder. This is what I already have, With an error of :D String imgName; --> There are the img names I need from the database Drawable drawable; drawable = Class.appContext.getResources().getDrawable(Class.appContext.getResources().getIdentifier("com.example.test:drawable/"+imgName,null,null)); Then I

问题 Does anybody know if there is a way of preventing a memory leak in RuntimeBinder when using "dynamic" keyword with __ComObject instances in C#? I got the following code: var t = Type.GetTypeFromCLSID(new Guid("BB06C0E4-D293-4f75-8A90-CB05B6477EEE")); while (true) { dynamic o = System.Activator.CreateInstance(t); Marshal.ReleaseComObject(o); } This leaks LocalVariableSymbol class instances (and other from the Microsoft.CSharp.RuntimeBinder.Semantics namespace). Replacing "dynamic" with "object

问题 I need to create dynamic filter that adds/removes rows dynamically. It contains a drop-down box. Depending upon the drop-down box value selected, I create a dynamic <TD> that may have a text field or drop-down list. If it's a text field, then I have to add date picker for that text field. I have done this, except date picker for dynamically generated text field. If you're creating 100 rows, the text fields' names should be same for all rows. How to add datepicker for dynamically generated