|
Yes - but my version is up to date!
Microsoft is not fond of fixing bugs ... 
Sent from my Amstrad PC 1640
Never throw anything away, Griff
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
|
|
|
|
|
Hi,
I want to get a copy of the line in foreach brackets. But since the copyline is the reference type, the line is also changing.
foreach ( var line in Lines)
{
var copyline= new LineTable();
copyline = line;
copyline.Id = 0;
copyline.InvoiceHeaderId = newHeaderId;
var lineResponse = _service.InsertLine(copyline);
if (lineResponse.Success)
{
line.UpdatedTime = DateTime.Now();
}
Already below that lines return value is true
System.Object.ReferenceEquals(line, copyline) return value of this code
Thanks for your answers
|
|
|
|
|
I have no idea what you're trying to.
But, there a problems with the code in general. First, you never make a copy of the object line is pointing to.
Next, you create a new variable, copyline, and point it a new instance of LineTable. On the very next line of code you throw that instance out. ???
foreach (var line in Lines)
{
var copyline = new LineTable();
copyline = line;
On the same line, you point copyline to the same object line is pointing to. This does NOT make a copy of an object!
copyline = line;
Then you start manipulating the properties of the object pointed to by copyline. Well, both line and copyline are pointing at the exact same object so the changes you make with one variable will show up in the other.
So, yeah, ReferenceEquals is going to return true.
If you're trying to make a copy of line, you're going to have to define exactly what you want to copy. A "shallow copy" can easily be done using MemberwiseClone(). A "deep copy" is quite a bit more complex, and can be done many different ways depending on what members of line you're copying and how.
|
|
|
|
|
I have code which unzips a file over others, but first checks the date of a special file to make sure it is newer. The ModifiedTime of the file is found using:
using (ZipFile zip = ZipFile.Read(OriginalFileName))
try
{
ZipEntry z = zip["save_history.log"];
NewFileAge = z.ModifiedTime;
}
catch......
WinZip shows the date of the file as 26/02/2019 3:56 PM. Extraction confirms this.
The value of NewFileAge in the code above is 26/02/2019 2:56 PM.
The only references I can find to this refer to remote servers in different time zones. All these files are on one computer.
Yes, it looks suspiciously like a daylight saving time issue, but I can't figure out how.
|
|
|
|
|
Which ZIP library are you using? The one in the .NET Framework doesn't have a .Read method.
Consult the documentation on that library. I'd be willing to bet the date/time you got back for the zip file entry is in UTC and you're comparing it to a local date/time.
|
|
|
|
|
I'm using Ionic.Zip. You are right, I've converted to local time and that sorts it.
Thanks.
|
|
|
|
|
I recently started programming with the wpf
<DataGridTextColumn.HeaderTemplate>
<DataTemplate >
<StackPanel Orientation="Horizontal">
<ComboBox Name="ddlTipo" TextBoxBase.TextChanged="DdlTipo_TextChanged"
in Mainwindow.cs : 'ddlTipo' does not exist in the current context
how can I do ?
thanks
|
|
|
|
|
Just a guess - and since we can't look at your code that's all it can be - C# is case sensitive.
Is it supposed to be ddlTipo or DdlTipo given that it's one in the "name" and the other in the event handler?
Sent from my Amstrad PC 1640
Never throw anything away, Griff
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
|
|
|
|
|
A column header template with a combo box that has a name accessed from code-behind.
You're just making this stuff up. There is no precedent.
What can you do? LEARN WPF.
Create a WPF application in Visual Studio | Microsoft Docs
"(I) am amazed to see myself here rather than there ... now rather than then".
― Blaise Pascal
|
|
|
|
|
What is Best way of remembering the history of treeview and other control also across the application in desktop application with example in C#/VB .net
Regards,
Girish
Email:mohantagirish9@gmail.com
Ph:8249511873
|
|
|
|
|
|
A memento-pattern (undo/redo) would be a logical store for such actions.
Bastard Programmer from Hell 
If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.
|
|
|
|
|
It depends on what "remembering the history" means;
1. logging changes
2. creating an undo/redo facility
3. saving/restoring the current state of UI, or data, at some point. by serialization/deserialization
If you edit your question to be more specific, I think you can get more specific responses. Include more information about context: WinForms, WPF, ASP ? MS TreeView or 3rd. party TreeView ?
«Where is the Life we have lost in living? Where is the wisdom we have lost in knowledge? Where is the knowledge we have lost in information?» T. S. Elliot
|
|
|
|
|
Hi BillWoodruff,
Thanks for your reply.
My requirement is the 3rd point
3. saving/restoring the current state of UI, or data, at some point. by serialization/deserialization
If any soulution is there, can you please provide me.
Thanks,
Girish
|
|
|
|
|
Hi, In order to respond in a way I think will assist you, you need to be more specific.
What specific properties of Controls do you want to save and restore ? Are the Controls run-time movable/resizable, or otherwise changeable ?
What specific properties of the TreeView do you want to save and restore ? Assuming the TreeNodes are bound/linked/connected to some other type of data, what is that data, and, do you need to save that data and restore it ?Quote: If any soulution is there, can you please provide me.
No, but, I will help you learn to do it yourself, and, by doing it yourself, you will learn a lot 
cheers, Bill
«Where is the Life we have lost in living? Where is the wisdom we have lost in knowledge? Where is the knowledge we have lost in information?» T. S. Elliot
|
|
|
|
|
Hi Bill,
My requirement is that i have multi hirarchy treeview control in a form and that form is in tab control and that tab has multiple tabs. When switching from one tab to another , that time automatically select the last selected node in that treeview and also after closing and opening the application, when we navigate to that tab control automatically select the last selected node.
If you have any quries then please let me know.
Regards,
Girish
|
|
|
|
|
First, ... and, I may be misinterpreting you here ... never put a Form inside another Form; use Panels.
What you describe does not seem that complex; I'd create some data-structure to hold the state of the panel to treenode relations: I'd use a Class that I could serialize, maybe something like:
using System.Collections.Generic;
using System.Runtime.Serialization;
using System.Windows.Forms;
namespace ?????????????
{
[DataContract]
public static class PanelToNode
{
[DataMember]
private static Dictionary<string, string> PanelNameToTreeNodeKey;
static PanelToNode()
{
PanelNameToTreeNodeKey = new Dictionary<string, string>();
}
public static TreeNode GetCurrentNode(Panel pnl)
{
}
public static Panel GetCurrentNode(TreeNode node)
{
}
public static void Serialize(string filepath)
{
}
public static void DeSerialize(string filepath)
{
}'
}
}Do study the relation between a TreeNode's 'Text and 'Name properties: setting the 'Text when you create a TreeNode does not set the 'Name. Why set/use the 'Name: because to find a TreeNode recursively using 'Find:
TreeNode[] matches = treeView1.Nodes.Find("someNode", searchAllChildren: true);
You must use the 'Name property ... which is really the 'Key property. Note what using 'Find returns: an array of TreeNodes ... think about that: it means many nodes can have the same 'Name.
There are many other ways you could approach coding this. And, now, you get started researching and experimenting, and come back with specific questions and code.
«Where is the Life we have lost in living? Where is the wisdom we have lost in knowledge? Where is the knowledge we have lost in information?» T. S. Elliot
|
|
|
|
|
I'm trying to find out what is possible in C#.
I know that this is possible
VolcanoRobot = new dante VolcanoRobot();
dante.showAttributes();
which will call an external class VolcanRobot and runs showAttributes() within the class
So is it possible to have a class within a class?
example
game.inventory.getobject();
This (if it works) calls a class then within the class it calls the inventory class and within inventory class it runs getobject()
Brian
|
|
|
|
|
Before I respond to your specific question, I want to suggest to you that you need to study the basics about what Classes are in C#. Based on my experience with students, I believe you are not clear yet on the important difference between declaring/defining a Class, and creating an instance of a Class.
After you understand that, you can then understand what static Classes are, where the declaration/definition of the Class automatically creates a singular instance.
~
Yes, it is possible to:
1. define a Class within a Class:
using System.Windows.Forms;
namespace YourNameSpace
{
public class OuterClass
{
public OuterClass(int someInt)
{
SomeOuterInt = someInt;
}
public int SomeOuterInt { set; get; }
public void SayWhat()
{
MessageBox.Show("Outer What");
}
public class InnerClass
{
public InnerClass(int someInt)
{
SomeInnerInt = someInt;
}
public int SomeInnerInt { set; get; }
public void SayWhat()
{
MessageBox.Show("Inner What");
}
}
}
}You can then create either Class:
OuterClass outerClass = new OuterClass(42);
OuterClass.InnerClass innerClass = new OuterClass.InnerClass(24);
outerClass.SayWhat();
innerClass,SayWhat(); But, think about what this is: it is the equivalent of a recipe/blueprint for the construction of a Class that happens to have another recipe/blueprint inside it.
There is no real "dependency" between the two Classes at run-time: creating an instance of the OuterClass does not create an instance of the InnerClass. You cannot do this:
OuterClass outerClass = new OuterClass(42);
outerClass.InnerClass.SomeInnerInt = 108;
«Where is the Life we have lost in living? Where is the wisdom we have lost in knowledge? Where is the knowledge we have lost in information?» T. S. Elliot
|
|
|
|
|
Maybe I'm wrong ... but I understood the question that the enquirer wants to instance OuterClass inside OuterClass. I didn't tried that yet ... but in my opinion that isn't possible ...
|
|
|
|
|
Thanks Bill.
After using an example from a book I had a better understanding on an instance of a class.
Thanks also for the code example you provided.
This is my main question.
I know that this is possible
dante.displayAttributes();
But is this possible
game.inventory.getobject
(notice the use of two dots instead of one dot.
I consider inventory to be within a class.
Brian
|
|
|
|
|
That's not nesting classes.
What you're really describing is the game class is exposing a property called 'inventory'. That property may return an instance of some class that manages a characters items collection. The getobject method would be called on whatever that class instance is that was returned by the inventory property.
|
|
|
|
|
Brian, Virtually anything can be done, but, I'd like to see you get a good grounding in the fundamentals of OOP in C# .NET, so that in the future you will be able to distinguish between what might be done and what is commonly done to create useful programs.
Everyone here was a beginner at some point We've all struggled towards mastery of the fantastically rich tools that the FrameWork, the language, and Visual Studio offer.
In my experience, students often go through a phase of bewilderment as they seek to get oriented; often become dazzled by some aspect of the language, like dot-notation. That's okay for a while, but needs to be slowly eclipsed by focusing on fundamentals.
Please check out some other posts of mine here that relate to learning C#, and which include book (some free) recommendations: [^], [^], [^]
Let's see you connect the dots
cheers, Bill
«Where is the Life we have lost in living? Where is the wisdom we have lost in knowledge? Where is the knowledge we have lost in information?» T. S. Elliot
|
|
|
|
|
Hi Bill.
I wanted to know if C# was suitable for my purpose before I went too depply into learning this language, but what I've seen so far it looks like it might be what I'm looking for.
Last year I learnt Python, but while it's easy to program in it's slow and does not create compiled files that have an exe extension so that they're easy to run. You can create an exe using py2exe program but there's a lot of work in making the code ready but adding extra information to the code.
Also it's a fairly loose language and A="Tom:A=22 works without an error, so 'A' is not protected
So after considering Visual Basic Net which tends to add extra code "If..Then.. End If, etc I'm starting to like C#.
The next step is to get a better understanding of things such as Constructors, Destructors and Polymorphism.
Brian
|
|
|
|
|
To add to Bill's comments, your example looks more like accessing a property of a class, in which case you don't need to nest the classes:
public class Game
{
public Game()
{
Inventory = new GameInventory();
}
public GameInventory Inventory { get; }
}
public class GameInventory
{
public object GetObject()
{
return ...
}
}
...
Game game = new Game();
object x = game.Inventory.GetObject();
C# Guide | Microsoft Docs[^]
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
