reference

问题 When trying to save an order we first load the object from session. This works. Then we add information to the order and put it back into session. I then receive and Object reference not set to an instance of an object error. Private Sub SaveOrder() 'load the order Order = Session("Order") 'Add order information here Session("Order") = Order 'The error is occurring here. End Sub The stack trace is as follows: Error Path: Contact.aspx Error Detail: Object reference not set to an instance of an

问题 In SAS/IML I try to pass to a user defined module a reference to a variable that is defined in macro. The module changes the variable value. Since call of the function is in the do-loop I cannot use &-sign . However use of symget does not work. Here is my code. proc iml; start funcReference(argOut); print "funcReference " argOut; argOut = 5; finish funcReference; store module=funcReference; quit; proc IML; mydata1 = {1 2 3}; call symput ('macVar', 'mydata1'); load module=funcReference; run

问题 I need to assign data field (component of another field symbol) to field-symbol in a several places of code. For the sake of reusability I decided to encapsulate this code in procedure, but I cannot understand how to pass field-symbols into this procedure. LOOP bseg ASSIGNING <bseg> ... PERFORM assigning USING <bseg> CHANGING <wrbtr>. ... ENDLOOP. FORM assigning USING <bseg> TYPE bseg CHANGING <wrbtr> TYPE bseg-wrbtr IF ... some logic here ASSIGN <bseg>-wrbtr TO <wrbtr>. ELSE ASSIGN <bseg>

问题 A collection is a list of nodes per W3C DOM Reference but where is a node defined? I'm assuming it is an element currently but where is the formal defenition? 回答1: It's in the DOM level 2 Core specification, here . The DOM HTML specs you're looking in contains elements specific to HTML, but it extends DOM 2 来源： https://stackoverflow.com/questions/6617030/where-is-a-node-defined

问题 I have this C# code: int i = 20; object t = i; object r = t; r = 100; Why at this point, the value of T is still 20 and not 100 ? I supposed T and R pointed to the same location and changes to any of them should affect each other... I can't really understand how reference types work in the Heap, please help me 回答1: Why at this point, the value of T is still 20 and not 100 ? Because you didn't modify t . You'll want to look up "boxing". But, what's going on in your code is that the value 20

问题 Background It started with a cmdlet as an answer for Save hash table in PowerShell object notation (PSON). Meanwhile evolved to ConvertTo-Expression. A cmdlet that serializes PowerShell objects to a PowerShell expression. Being a little involved in the -Depth issues with similar native cmdlets (ConvertTo-Xml and ConvertTo-Json) due to recurring property references, I am wondering if this issue could be nicely resolved in a PowerShell expression. Example $Object = @{ Name = "Parent" Child = @{

问题 It seems that using Excel functions INDIRECT(ADDRESS(...)) and OFFSET(...) can be used interchangeably. For example, the following two formulas return the same result to an absolute reference: = INDIRECT(ADDRESS(1,1)) = OFFSET(<current cell>,1-ROW(),1-COLUMN()) And similarly the next two formulas return the same result to a relative reference (in this case, for example, these formulas return whatever value is in the cell below this cell with the formula): = OFFSET(<current cell>,1,0) =

问题 I have been trying to add Quartz.dll as reference for so many times but it keeps showing the message A reference to 'Quartz.dll' cannot be added. A reference to the component 'Quartz' already exists in the project. Before this issue happens, I indeed had added Quartz reference into the project, but I messed up with another issue so I have to re-add the reference. However, the above message prevents me from doing that, when there is actually nothing named 'Quartz' seen ticked in the Reference

问题 I am looking for a way to keep reference of an object/instance that's a member object of a service. I know in case of Activities, we can save it by the provided onSaveInstance method. However, I couldn't find any similar way for a service. I can use static object but it's unsafe as there is no guaranty , if the reference would be valid the next time, the service is created. Another possible way would be, I store all the data on storage & later on when the service is created again, I can read

问题 As I read ---references are not pointers it is the object itself,A reference is an entity that is an alias for another object. ---references can never represent NULL ---Reference variables allow two variable names to address the same memory location: ---it cannot later be made to refer to a different object ---A reference is not a variable as a variable is only introduced by the declaration of an object. An object is a region of storage and, in C++, references do not (necessarily) take up any