C# Discussion Boards - CodeProject

Re: Still fighting with the terminologies of unicode vs. encoding

18-Dec-17 2:19

PIEBALDconsult wrote:
my pedanticism

On the other other hand, my pedantry does extend to saying there's no such word as "pedanticism". Poke tongue | ;-P

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

PIEBALDconsult18-Dec-17 12:01

PIEBALDconsult

18-Dec-17 12:01

You must not be a true pedanticist.

Advice on Partial View

sunsher16-Dec-17 0:36

sunsher

16-Dec-17 0:36

Hi,

I am creating an Asp.Net MVC5 application where I have two areas called Teacher and Parent. I want to display a Child's home page based on the area, that is, both the teacher and parent have their own page layout. I can pull the child data using json. How can display it as a partial view in both parent and teacher home page?

Thanks

Re: Advice on Partial View

Richard MacCutchan16-Dec-17 0:47

Richard MacCutchan

16-Dec-17 0:47

sunsher wrote:
I am creating an Asp.Net MVC5 application

Then you should post your question in the ASP.NET forum: ASP.NET Discussion Boards[^].

Convert .NET 4.5 method into .NET 2.0 using LinqBridge

arnold_w14-Dec-17 1:39

Re: Convert .NET 4.5 method into .NET 2.0 using LinqBridge

14-Dec-17 1:39

This is a spin-off from the thread Efficiently sort the following? - Algorithms Discussion Boards , but specifically is about converting .NET 4.5 LINQ code into .NET 2.0 code using LinqBridge. The following code is using .NET 4.5 and works fine in Visual Studio 2013:

        public struct Record
        {
            public string column1 { get; set; }
            public string column2 { get; set; }
            public string column3 { get; set; }
        }

        public Form1()
        {
            InitializeComponent();

            Record[] UnsortedRecords =
            {
                new Record { column1 = "City",   column2 = "Florida",    column3 = "Miami"},
                new Record { column1 = "Animal", column2 = "Land",       column3 = "Dog"},
                new Record { column1 = "Animal", column2 = "Land",       column3 = "Rabbit"},
                new Record { column1 = "Food",   column2 = "Dessert",    column3 = "Chocolate Mousse"},
                new Record { column1 = "Food",   column2 = "Dinner",     column3 = "Hamburger"},
                new Record { column1 = "Animal", column2 = "Water",      column3 = "Fish"},
                new Record { column1 = "Animal", column2 = "Land",       column3 = "Cat"},
                new Record { column1 = "Food",   column2 = "Dessert",    column3 = "Cake"},
                new Record { column1 = "Animal", column2 = "Air",        column3 = "Bird"},
                new Record { column1 = "Food",   column2 = "Dessert",    column3 = "Ice Cream"},
                new Record { column1 = "Food",   column2 = "Dinner",     column3 = "Steak"},
                new Record { column1 = "Animal", column2 = "Water",      column3 = "Sea Lion"},
                new Record { column1 = "City",   column2 = "Texas",      column3 = "Austin"},
                new Record { column1 = "Food",   column2 = "Breakfast",  column3 = "Cereal"},
                new Record { column1 = "Food",   column2 = "Breakfast",  column3 = "Pancakes"},
                new Record { column1 = "City",   column2 = "Florida",    column3 = "Tampa"},
                new Record { column1 = "Animal"  , column2 = "Air",      column3 = "Fly"},
                new Record { column1 = "City",   column2 = "California", column3 = "San Francisco"},
                new Record { column1 = "Food",   column2 = "Breakfast",  column3 = "Bacon and Eggs"},
                new Record { column1 = "City",   column2 = "Texas",      column3 = "Dallas"},
                new Record { column1 = "City",   column2 = "Texas",      column3 = "Houston"},
                new Record { column1 = "City",   column2 = "California", column3 = "Los Angeles"},
                new Record { column1 = "Animal", column2 = "Water",      column3 = "Dolphin"},
                new Record { column1 = "Animal", column2 = "Air",        column3 = "Bee"},
                new Record { column1 = "City",   column2 = "Florida",    column3 = "Orlando"},
                new Record { column1 = "City",   column2 = "California", column3 = "San Diego"},
                new Record { column1 = "Food",   column2 = "Dinner",     column3 = "Lasagna" },
            };

            /* Sorted:
                "City" "Florida" "Miami"
                "City" "Florida" "Tampa"
                "City" "Florida" "Orlando"
                "City" "Texas" "Austin"
                "City" "Texas" "Dallas"
                "City" "Texas" "Houston"
                "City" "California" "San Francisco"
                "City" "California" "Los Angeles"
                "City" "California" "San Diego"
                "Animal" "Land" "Dog"
                "Animal" "Land" "Rabbit"
                "Animal" "Land" "Cat"
                "Animal" "Water" "Fish"
                "Animal" "Water" "Sea Lion"
                "Animal" "Water" "Dolphin"
                "Animal" "Air" "Bird"
                "Animal" "Air" "Fly"
                "Animal" "Air" "Bee"
                "Food" "Dessert" "Chocolate Mousse"
                "Food" "Dessert" "Cake"
                "Food" "Dessert" "Ice Cream"
                "Food" "Dinner" "Hamburger"
                "Food" "Dinner" "Steak"
                "Food" "Dinner" "Lasagna"
                "Food" "Breakfast" "Cereal"
                "Food" "Breakfast" "Bacon and Eggs"
                "Food" "Breakfast" "Pancakes"
            */
            IEnumerable<Record> SortedRecords = SortRecords(UnsortedRecords);
        }

        public static IEnumerable<Record> SortRecords(IEnumerable<Record> source)
        {
            return source
                .GroupBy(r => r.column1, (key, items) => items
                    .GroupBy(r => r.column2)
                    .SelectMany(g => g)
                )
                .SelectMany(g => g);
        }

The code above works great, but I need to run it in Visual Studio 2005, that is .NET 2.0. I have downloaded LinqBridge.dll ( LinqBridge ) and added a reference to it and I have tried the following, but I get build errors:

        public class Record
        {
            public string column1;
            public string column2;
            public string column3;

            public Record(string column1, string column2, string column3)
            {
                this.column1 = column1;
                this.column2 = column2;
                this.column3 = column3;
            }
        }

        public Form1()
        {
            InitializeComponent();
            System.Collections.ArrayList UnsortedRecords = new System.Collections.ArrayList();
            UnsortedRecords.Add(new Record("City",   "Florida",    "Miami"));
            UnsortedRecords.Add(new Record("Animal", "Land",       "Dog"));
            UnsortedRecords.Add(new Record("Animal", "Land",       "Rabbit"));
            UnsortedRecords.Add(new Record("Food",   "Dessert",    "Chocolate Mousse"));
            UnsortedRecords.Add(new Record("Food",   "Dinner",     "Hamburger"));
            UnsortedRecords.Add(new Record("Animal", "Water",      "Fish"));
            UnsortedRecords.Add(new Record("Animal", "Land",       "Cat"));
            UnsortedRecords.Add(new Record("Food",   "Dessert",    "Cake"));
            UnsortedRecords.Add(new Record("Animal", "Air",        "Bird"));
            UnsortedRecords.Add(new Record("Food",   "Dessert",    "Ice Cream"));
            UnsortedRecords.Add(new Record("Food",   "Dinner",     "Steak"));
            UnsortedRecords.Add(new Record("Animal", "Water",      "Sea Lion"));
            UnsortedRecords.Add(new Record("City",   "Texas",      "Austin"));
            UnsortedRecords.Add(new Record("Food",   "Breakfast",  "Cereal"));
            UnsortedRecords.Add(new Record("Food",   "Breakfast",  "Pancakes"));
            UnsortedRecords.Add(new Record("City",   "Florida",    "Tampa"));
            UnsortedRecords.Add(new Record("Animal"  , "Air",      "Fly"));
            UnsortedRecords.Add(new Record("City",   "California", "San Francisco"));
            UnsortedRecords.Add(new Record("Food",   "Breakfast",  "Bacon and Eggs"));
            UnsortedRecords.Add(new Record("City",   "Texas",      "Dallas"));
            UnsortedRecords.Add(new Record("City",   "Texas",      "Houston"));
            UnsortedRecords.Add(new Record("City",   "California", "Los Angeles"));
            UnsortedRecords.Add(new Record("Animal", "Water",      "Dolphin"));
            UnsortedRecords.Add(new Record("Animal", "Air",        "Bee"));
            UnsortedRecords.Add(new Record("City",   "Florida",    "Orlando"));
            UnsortedRecords.Add(new Record("City",   "California", "San Diego"));
            UnsortedRecords.Add(new Record("Food",   "Dinner",     "Lasagna" ));

            /* Sorted:
                "City" "Florida" "Miami"
                "City" "Florida" "Tampa"
                "City" "Florida" "Orlando"
                "City" "Texas" "Austin"
                "City" "Texas" "Dallas"
                "City" "Texas" "Houston"
                "City" "California" "San Francisco"
                "City" "California" "Los Angeles"
                "City" "California" "San Diego"
                "Animal" "Land" "Dog"
                "Animal" "Land" "Rabbit"
                "Animal" "Land" "Cat"
                "Animal" "Water" "Fish"
                "Animal" "Water" "Sea Lion"
                "Animal" "Water" "Dolphin"
                "Animal" "Air" "Bird"
                "Animal" "Air" "Fly"
                "Animal" "Air" "Bee"
                "Food" "Dessert" "Chocolate Mousse"
                "Food" "Dessert" "Cake"
                "Food" "Dessert" "Ice Cream"
                "Food" "Dinner" "Hamburger"
                "Food" "Dinner" "Steak"
                "Food" "Dinner" "Lasagna"
                "Food" "Breakfast" "Cereal"
                "Food" "Breakfast" "Bacon and Eggs"
                "Food" "Breakfast" "Pancakes"
            */
            System.Collections.ArrayList SortedRecords = SortRecords(UnsortedRecords);
        }

        // You can either replace the ArrayList with a List<T>[^], or use the Cast[^] or OfType[^] 
        // methods to convert it to an IEnumerable<T>.
        public static IEnumerable<Record> SortRecords(IEnumerable<Record> source)
        {
            IEnumerable<IEnumerable<Record>> groupT = System.Linq.Enumerable.GroupBy<Record, string, IEnumerable<Record>>(source,
                delegate(Record r) { return r.column1; },
                delegate(string key, IEnumerable<Record> items)
                {
                    IEnumerable<IGrouping<string, Record>> groupH = System.Linq.Enumerable.GroupBy<Record, string>(items, delegate(Record r) { return r.column2; });
                    return System.Linq.Enumerable.SelectMany<IEnumerable<Record>, Record>(groupH, delegate(IEnumerable<Record> g) { return g; });
                });

            return System.Linq.Enumerable.SelectMany<IEnumerable<Record>, Record>(groupT, delegate(IEnumerable<Record> g) { return g; });
        }

Can someone please help me get this work?

Richard Deeming14-Dec-17 2:39

Re: Convert .NET 4.5 method into .NET 2.0 using LinqBridge

14-Dec-17 2:39

The obvious error is that you're trying to pass the non-generic ArrayList class to a parameter which expects the generic IEnumerable<T> interface, and trying to assign an IEnumerable<T> to an ArrayList.

ArrayList doesn't implement IEnumerable<T>, because it pre-dates generics. Change the variables:

List<Record> UnsortedRecords = new List<Record>();
UnsortedRecords.Add(...);
...

IEnumerable<Record> SortedRecords = SortRecords(UnsortedRecords);

With that change in place, your code should work. If you're still getting compiler errors, then post them here.

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

arnold_w14-Dec-17 3:15

Re: Convert .NET 4.5 method into .NET 2.0 using LinqBridge

14-Dec-17 3:15

I have re-arranged the code a little to make it easier to spot the compile errors:

30      
31                  List<Record> UnsortedRecords = new List<Record>();
32                  UnsortedRecords.Add(new Record("City",   "Florida",    "Miami"));
33                  // The rest of the adds are removed in order to compact the code
34       
35                  List<Record> SortedRecords = SortRecords(UnsortedRecords);
36              }
37      
38              // You can either replace the ArrayList with a List<T>[^], or use the Cast[^] or OfType[^] 
39              // methods to convert it to an IEnumerable<T>.
40              public static IEnumerable<Record> SortRecords(IEnumerable<Record> source)
41              {
42                  IEnumerable<IEnumerable<Record>> groupT = System.Linq.Enumerable.GroupBy<Record, string, IEnumerable<Record>>
43                      (source,
44                      delegate(Record r) { return r.column1; },
45                      delegate(
46                      string key, IEnumerable<Record> items)
47                      {
48                          IEnumerable<System.Linq.IGrouping<string, Record>> groupH = System.Linq.Enumerable.GroupBy<Record, string>(items, delegate(Record r) { return r.column2; });
49                          return System.Linq.Enumerable.SelectMany<IEnumerable<Record>, 
50                              Record>(groupH, 
51                              delegate(IEnumerable<Record> g) { 
52                                     return g; });
53                      });
54      
55                  return System.Linq.Enumerable.SelectMany<IEnumerable<Record>, Record>(groupT, delegate(IEnumerable<Record> g) { return g; });
56              }
57          }
58      }

I get the following 5 compile errors:

Line 35: Cannot implicitly convert type 'System.Collections.Generic.IEnumerable<sort.form1.record>' to 'System.Collections.Generic.List<sort.form1.record>'. An explicit conversion exists (are you missing a cast?)

Line 43: The best overloaded method match for 'System.Linq.Enumerable.GroupBy<sort.form1.record,string,system.collections.generic.ienumerable<sort.form1.record>>(System.Collections.Generic.IEnumerable<sort.form1.record>, System.Func<sort.form1.record,string>, System.Func<sort.form1.record,system.collections.generic.ienumerable<sort.form1.record>>)' has some invalid arguments

Line 45: Argument '3': cannot convert from 'anonymous method' to 'System.Func<sort.form1.record,system.collections.generic.ienumerable<sort.form1.record>>'

Line 50: The best overloaded method match for 'System.Linq.Enumerable.SelectMany<system.collections.generic.ienumerable<sort.form1.record>,Sort.Form1.Record>(System.Collections.Generic.IEnumerable<system.collections.generic.ienumerable<sort.form1.record>>, System.Func<system.collections.generic.ienumerable<sort.form1.record>,System.Collections.Generic.IEnumerable<sort.form1.record>>)' has some invalid arguments

Line 50: Argument '1': cannot convert from 'System.Collections.Generic.IEnumerable<system.linq.igrouping<string,sort.form1.record>>' to 'System.Collections.Generic.IEnumerable<system.collections.generic.ienumerable<sort.form1.record>>'

Richard Deeming14-Dec-17 3:30

Re: Convert .NET 4.5 method into .NET 2.0 using LinqBridge

14-Dec-17 3:30

Your method returns IEnumerable<Record>, not List<Record>. Either change the variable type, or convert the returned value to a list.

IEnumerable<Record> SortedRecords = SortRecords(UnsortedRecords);

// Or:
List<Record> SortedRecords = System.Linq.Enumerable.ToList<Record>(SortRecords(UnsortedRecords));

For the other errors, it's usually best to start with the inner-most error first.

return System.Linq.Enumerable.SelectMany<IEnumerable<Record>, Record>(
    groupH, 
    delegate(IEnumerable<Record> g) { return g; });

C# 2 is not as forgiving with generic types. You have to use IGrouping<string, Record> instead of IEnumerable<Record> here.

return System.Linq.Enumerable.SelectMany<IGrouping<string, Record>, Record>(
    groupH, 
    delegate(IGrouping<string, Record> g) { return g; });

With that one fixed, the errors on lines 43 and 45 should also go away.

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

arnold_w14-Dec-17 4:14

Re: Convert .NET 4.5 method into .NET 2.0 using LinqBridge

14-Dec-17 4:14

Now it compiles perfectly:

        public static IEnumerable<Record> SortRecords(IEnumerable<Record> source)
        {
            IEnumerable<IEnumerable<Record>> groupT = System.Linq.Enumerable.GroupBy<Record, string, IEnumerable<Record>>
                (source,
                delegate(Record r) { return r.column1; },
                delegate(string key, IEnumerable<Record> items)
                {
                    IEnumerable<System.Linq.IGrouping<string, Record>> groupH = 
                        System.Linq.Enumerable.GroupBy<Record, string>(items, delegate(Record r) { return r.column2; });
                    return System.Linq.Enumerable.SelectMany<System.Linq.IGrouping<string, Record>, Record>(groupH,
                        delegate(System.Linq.IGrouping<string, Record> g)
                        { 
                             return g; 
                        });
                });
            return System.Linq.Enumerable.SelectMany<IEnumerable<Record>, Record>(groupT, delegate(IEnumerable<Record> g) { return g; });
        }

However, when I look at the SortedRecords array in the debugger I can't see the Records. It says:
collectionSelector null
resultSeelctor null
source null

How do I retrieve the sorted Records?

arnold_w14-Dec-17 5:19

Re: Convert .NET 4.5 method into .NET 2.0 using LinqBridge

14-Dec-17 5:19

This seems to solve it:

IEnumerable<Record> SortedRecords = SortRecords(UnsortedRecords);

List<Record> SortedRecordsList = new List<Record>();
IEnumerator<Record> Enumerator = SortedRecords.GetEnumerator();

while (Enumerator.MoveNext())
{
    SortedRecordsList.Add(Enumerator.Current);
}

A big thanks to Richard Deeming, I'm so happy the sorting is working now.

Richard Deeming14-Dec-17 6:17

Re: Convert .NET 4.5 method into .NET 2.0 using LinqBridge

14-Dec-17 6:17

A slight simplification:

List<Record> SortedRecordsList = new List<Record>();
SortedRecordsList.AddRange(SortedRecords);

Or:

List<Record> SortedRecordsList = System.Linq.Enumerable.ToList<Record>(SortedRecords);

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

BillWoodruff15-Dec-17 11:06

BillWoodruff

15-Dec-17 11:06

Up-voting the responses of someone who assisted you is a good way to contribute to CodeProject, as well as letting the person who helped you know you appreciate their time and knowledge.

cheers, Bill

«While I complain of being able to see only a shadow of the past, I may be insensitive to reality as it is now, since I'm not at a stage of development where I'm capable of seeing it.» Claude Levi-Strauss (Tristes Tropiques, 1955)

Re: Convert .NET 4.5 method into .NET 2.0 using LinqBridge

arnold_w15-Dec-17 20:29

Need to understand work assigned to me

15-Dec-17 20:29

I clicked some links I thought might mean giving praise, can you please confirm I did it right?

nisss13-Dec-17 20:13

nisss

13-Dec-17 20:13

Hello everyone,

I am new to c# previously I used to work on vb.net and I have joined a new organisation where I have been assigned this following task. Posted below is my task. I need someone who could explain me this task as a layman.

We will be creating a new GUI: This GUI will be a generic GUI capable of allowing for configuration of all some Actions, without specific knowledge of each one. This will allow us to expand the components and variables of our system without the need to completely redo the GUI every time we alter a feature.
There is a new project I created within the solution. If you get the latest version of the solution from source control you should see it. There are currently no classes in it.
We need to create the following items:
A new Class GUICreator
This class will accept be responsible for creating a new Panel, which can be displayed within a Windows UI.
It should have an empty constructor and which accepts a profile name for future settings use
It needs a new function "CreatePanel" which accepts a list of GUIObject and returns a Panel, which can then be displayed in another application
A new class GUIControl
This class will contain the information about what type of element we are creating on the GUI
It should have the following(at a minimum):
string: dataType
string: dataName
string: profileName
string: validationRegex
string: tooltip
Control: Windows Control
GetControl - This should return a the control to be used in the Panel based on the data type. For instance it could return a textbox or checkbox
ValidateData: this function will compare the data to the ValidationRegex of the GUIControl and return true or false
Save: This function will save the data based on the data name and profileName of this object
Load: this function will load the data based on the data name and profile name of this object
A new class Panel
This class will be a collection of GUIControl displayed on a panel in a readable layout
This should be a standard windows panel and have a tooltip object which will display the tooltip value for the GUIControl that is currently under the mouse
It will have a LoadFunction which calls the load function of all GUIControls
It will have a save function which calls the save of all GUIControls
The layout of the objects in the panel should default to a format that is both legible and able to be interacted with. This panel can then be displayed in various GUIs such as our user and admin tools to display all settings within the system in a generic way. It also provides flexibility for when we add a new variable or feature to the product we do not need to redesign the entire panel or GUI, we just need to add a new GUIControl object to the panel and everything will continue to work.

modified 14-Dec-17 3:31am.

OriginalGriff13-Dec-17 20:36

OriginalGriff

13-Dec-17 20:36

Pretend it's a VB project, and read it again. You should be able to understand what is required of you, and it's the same job in C#.

But frankly - that looks like homework, not a work specification. It spells out everything down to the lowest level, and only just doesn't write the actual code for you...

Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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nisss14-Dec-17 0:11

nisss

14-Dec-17 0:11

I had never worked on classes even using vb.net and I have always used GUI object from Windows Form designer. Treat me as a fresher and please help me understand this task.

OriginalGriff14-Dec-17 0:32

OriginalGriff

14-Dec-17 0:32

How the heck did you manage to get anything working in VB.NET without using classes? Everything is class based! The whole of .NET is a massive collection of classes!

I think that you need to go back to basics, and start from scratch with the basics of OOPs - you would not understand the code to solve that homework without that, and that makes the whole exercise futile for both of us. Me, because I waste my time on something you can't use unless you hand it in as your own work; yours because it means that the next piece of homework is even more difficult for you - and you fail your course because you can't catch up.

Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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nisss14-Dec-17 0:52

nisss

14-Dec-17 0:52

I agree that everything in .NET is class based. I meant to say I have never created a class of my own.Hence it is difficult for me to work on this task. I apologize that I have wasted your time. Just wanted some explanation from your end because I felt that you were very much clear about my task. I still feel that a bit explanation from your end will help me understand this task and despite your explanation I failed to understand this task I will stop posting message. Hoping for some positive reply from your end.