What the reason of the error ?

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Hi there. I'm using Visual Studio 2022.
I have an error prompt that I had no experience with.
the program has a class named Common as follows:

C#

namespace WindowsFormsApp1
{
    public class Common
    {
        public class flanges
        {
            public string Name;
            public string Description;
            public double Size;
        }
    }

Then I use it in a user control as a List type as follows:

C#

namespace WindowsFormsApp1
{
    public partial class MyUserControl1 : UserControl
    {
        private List<common.flanges> _Flange=new List<common.flanges>();
        public List<common.flanges> Flange
        { 
            get { return _Flange; }
            set { _Flange = value; }
        }
            
        public MyUserControl1()
        {
            InitializeComponent();
        }
    }
}

It builds the program but when I try to insert it in form during edit time, I get an error prompt then I disable it to save or run the program. Note that inserting the user control through the program at the run time makes no problems.

What I have tried:

I couldn't check the assembly file. It seems that's not supported in VS2022.

Posted 10-Jun-22 9:23am

Member 12687352

Updated 13-Jun-22 19:38pm

Dave Kreskowiak

v2

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Comments

Graeme_Grant 11-Jun-22 0:11am

What is the error message?

Member 12687352 14-Jun-22 0:43am

Failed to create component 'MyUserControl1'. The error
message follows:
'Systerm.Runtime Serializatıon.SerIalizationException: Type
'WindowsFormsApp1.Common+Flanges In Assembly
WindowsFormsApp1, Version=1.0.0.0, Culture=neutral,
PublicKeyToken=null' Is not marked as serıalizable
at
System.Runtime Serialization.FormatterServlces nternalGetSeri
alizableMembers(RuntimeType type]
at
System.Collectıons.Concurrent.ConcurrentDictionary '2.GetOrAdd(TKey key, Func 2 valueFactory)
at
System.Runtime Serializatıon.FormatterServIces.GetSerializable
Members(Type type, StreamingContext context]
at
System.Runtime Serializatıon.Formatters.Binary.WriteObjectlnfo. Initemberlnfo()
at
System.Runtime Serializatıon.Formatters.Binary.WriteObjectlnfo.
InitSerialize(Type objectType, Surrogateselector
surrogateselector, StreamingContext context,
SerObjectinfolnit serObjectinfoinit, FormatterConverter
converter, SerıalizatıonBinder binder)
at
System.Runtime Serializatıon.Formatters.Binary.ObJectWriter
WriteArray(WriteObjectinfo objectlnfo, Namelnfo
memberNameinfo, WriteObjectlnfo

Richard MacCutchan 11-Jun-22 3:33am

"I get an error prompt"
And what does it say?

Member 12687352 14-Jun-22 0:43am

Failed to create component 'MyUserControl1'. The error
message follows:
'Systerm.Runtime Serializatıon.SerIalizationException: Type
'WindowsFormsApp1.Common+Flanges In Assembly
WindowsFormsApp1, Version=1.0.0.0, Culture=neutral,
PublicKeyToken=null' Is not marked as serıalizable
at
System.Runtime Serialization.FormatterServlces nternalGetSeri
alizableMembers(RuntimeType type]
at
System.Collectıons.Concurrent.ConcurrentDictionary '2.GetOrAdd(TKey key, Func 2 valueFactory)
at
System.Runtime Serializatıon.FormatterServIces.GetSerializable
Members(Type type, StreamingContext context]
at
System.Runtime Serializatıon.Formatters.Binary.WriteObjectlnfo. Initemberlnfo()
at
System.Runtime Serializatıon.Formatters.Binary.WriteObjectlnfo.
InitSerialize(Type objectType, Surrogateselector
surrogateselector, StreamingContext context,
SerObjectinfolnit serObjectinfoinit, FormatterConverter
converter, SerıalizatıonBinder binder)
at
System.Runtime Serializatıon.Formatters.Binary.ObJectWriter
WriteArray(WriteObjectinfo objectlnfo, Namelnfo
memberNameinfo, WriteObjectlnfo

2 solutions

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OriginalGriff · Answer 1 · 2022-06-10T09:40:00

Solution 1

C# is case sensitive: Common is not the same as common.
So this:

C#

public class Common
   {
   public class flanges
      {
      ....
      }

Does not match with this:

C#

private List<common.flanges> _Flange=new List<common.flanges>();

It's also considered good practive to start Class names with an Upper case character: class Common is correct, class common is not

Posted 10-Jun-22 9:40am

OriginalGriff

Comments

Member 12687352 10-Jun-22 19:14pm

That was my mistake while I was typing the question. Sorry. The letter cases are correct in VS program.

Graeme_Grant · Answer 2 · 2022-06-13T19:38:00

I loaded up a project and ran your code modified and works as expected. Here is the code that I used:

1. Flange Class (changed fields to properties)

C#

public class Flange
{
    public string Name { get; set; }
    public string Description { get; set; }
    public double Size { get; set; }
}

2. FlangeControl

C#

public partial class FlangeControl : UserControl
{
    private List<Flange> flanges = new();

    public List<Flange> Flanges
    {
        get => flanges;
        set => flanges = value;
    }

    public FlangeControl() => InitializeComponent();
}

3. Then I dragged and dropped the FlangeControl from the Toolbox.

4. Ran code, no errors.

Hope this helps!

PS: I am using a slightly more modern conventions.