Static Classes: The type initializer for ' *** ' threw an exception.

Question

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I have a static class and lots of other classes.
Static Class has lots of variables and one of them is double:

C#

public static double speed = 2;

I try to change its value at the start of the program or at a little further:

C#

Data.speed = 2;

and it throws the next exception:

Quote:
An unhandled exception of type 'System.TypeInitializationException' occurred in Game X-O.exe

Additional information: The type initializer for 'Game_X_O.Data' threw an exception.

But when i change its value somewhere else, it works fine.
It also works fine if i create a new Windows Forms application and that is why i can't reproduce the problem.

I can also record a video of my Visual Studio to show the problem if needed.
If i can share some information to help, let me know.

Static Class:

C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;

namespace Game_X_O
{
    static class Data
    {
        public static double speed = 2;

        static float plus = 1;
        static int percent = 20;
        static bool _in = true;

        public static Color item0_color = Color.White;
        public static float item0_plus = plus;
        public static bool item0_in = _in;
        public static int item0_percent = percent;

        public static Color item1_color = Color.Yellow;
        public static float item1_plus = plus;
        public static bool item1_in = _in;
        public static int item1_percent = percent;

        public static Color item2_color = Color.Red;
        public static float item2_plus = plus;
        public static bool item2_in = _in;
        public static int item2_percent = percent;

        public static Color lines_color = Color.White;
        public static int lines_percent = percent;
        public static double lines_speed = 2D;

        public static Color line_color = Color.White;
        public static int line_percent = percent;
        public static int line_plus = 20;

        public static int i1_size = 0;
        public static int i2_size = Calculate.arr_size * Calculate.arr_size + 3;
        public static int i3_size = i2_size + Calculate.arr_size * Calculate.arr_size + 1;
        public static int i4_size = i3_size + Form1.form1.items.itemslength;

        public static int i1_start = 0;
        public static int i1_stop = i1_start;

        public static int i2_start = 3 + Calculate.arr_size * Calculate.arr_size;
        public static int i2_stop = i2_start;

        public static int i3_start = 3 + Calculate.arr_size * Calculate.arr_size * 2;
        public static int i3_stop = i3_start;

        public static int i4_start;
        public static int i4_stop;
    }
}

Form1 Class where i call it:

C#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading;
using System.Windows.Forms;

namespace Game_X_O
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            Data.speed = 5; // exception

            InitializeComponent();

            FormBorderStyle = FormBorderStyle.None;
            this.WindowState = FormWindowState.Maximized;

            this.DoubleBuffered = true;

            form1 = this;

            w = System.Windows.Forms.Screen.GetBounds(this).Width;
            h = System.Windows.Forms.Screen.GetBounds(this).Height;

            New();
        }

        public static Form1 form1;

        public static int w;
        public static int h;
        public static int size = 3 + Calculate.arr_size * Calculate.arr_size * 2 + New_Items.max_itemslength + 1;

        public void New()
        {
            di = new Draw_Items(form1);
            game = new Game(form1);
            rects = new Rectangles(form1);
            items = new New_Items(form1);
            calc = new Calculate(form1);
            ls = new Lines(form1);
            ai = new Add_Items(form1);
            draw = new Draw(form1);
            ll = new Light_Lines(form1);
            mga = new Move_Game_Area(form1);

            Start();

            ci = new Control_Items(form1);
        }

        public Game game;
        public Rectangles rects;
        public New_Items items;
        public Calculate calc;
        public Lines ls;
        public bool single = false;
        public Draw_Items di;
        public Add_Items ai;
        public Draw draw;
        public Light_Lines ll;
        public Move_Game_Area mga;
        public Control_Items ci;

        private void Start()
        {
            game.Play();
        }
    }
}

InnerException:

Quote:
System.NullReferenceException: Object reference not set to an instance of an object.
at Game_X_O.Data..cctor() in c:\Users\Ziya1995\Desktop\Game X-O 18 - Copy\Game X-O\Data.cs:line 42

Posted 2-Mar-15 4:12am

Ziya1995

Updated 2-Mar-15 5:39am

v8

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Comments

Sergey Alexandrovich Kryukov 2-Mar-15 10:16am

What's the use of showing exception message without showing a line where it was thrown?
Why video? If you need help, you need appropriate issue report, comprehensive exception information, code sample...
—SA

Ziya1995 2-Mar-15 10:52am

I added:
Data.speed = 5; // exception
Let me know, if i can help.

Sergey Alexandrovich Kryukov 2-Mar-15 11:20am

It could be null exception id Data is null. Check it up under the debugger.
—SA

Ziya1995 2-Mar-15 11:28am

I never do something to Data, i just named a static class "Data" and that is all.
I always used Data static variables and now can use, but in this case with this variable it gives exception.

So, what does "Data is null" mean and how can i fix it?

Sergey Alexandrovich Kryukov 2-Mar-15 11:37am

If you don't know what null means, you should stop doing what you are doing and start learning software from the very, very beginning. You need to understand pointers and references, at least the idea. This is not a topic for Quick Questions & Answers. Not knowing it is the same as not knowing what is variable, constant, function, member and so on. Writing a single line of code would already be a waste of time until you at least read about the basic topics.
—SA

Sergey Alexandrovich Kryukov 2-Mar-15 11:39am

Not sure that you have done as you described; then your exception would be somewhere else. I can see your definition for Data. First of all, this static class is probably a bad idea. As everything is static, that line you pointed out could not through the exception. You either presented not the code you used to execute, or your observations are incorrect.
—SA

Ziya1995 2-Mar-15 12:05pm

Let's be gentle, i really need help, i learned how to use Thread Timer as you teached me the last time and it turned out the best option, better than all the 3 timers of .Net Framework, and now i can use Thread Timer, so you can be sure, it is not wasting time on me, and if it was easy, i would not post this question, although i post easy questions sometimes. I hope it is ok)

Let's get to task.
I know what is null, i mean i don't know how a class can be null, an instance of the class can be null, not a class.

So, can you teach me how a class (Data) can be null?
And how to fix this problem?

Sergey Alexandrovich Kryukov 2-Mar-15 13:37pm

I don't mean to be not gentle. Sorry if I was mistaken about your level of understanding, it's just my excuse is that my reply was based on the impression your previous comment gave me, nothing else: you wrote: what "does "Data is null" mean..?"; so, how else could I understand it? If you say you know what is null, it's good, it's just your phrase was misleading.

I already told you how I see it. Yes, of course, if your wrote

static class Data {
    public static double speed = 2;
... }

The line
Data.speed = 5; could never though the exception. Conclusions? I don't know. It could be different things: 1) you have another name Data meaning something else; 2) you show one code but the problem is detected on somewhat different code; 3) your exception information is incorrect; or something else like that.

So, you can check up everything, have only one version of the code, execute it under the debugger, get comprehensive exception information, not only exact line. Clean up the project before proceeding, go slowly.

—SA

Thomas Daniels 2-Mar-15 11:29am

Check the InnerException of the exception. That one shows the cause of the error.

Ziya1995 2-Mar-15 11:41am

I checked and added, take a look.
What to do now?

Thomas Daniels 2-Mar-15 11:43am

It looks like the error happens in the New() method, when you pass form1 to one of those classes. I assume one of those methods wants to use a variable of form1, but that's not possible, because form1 is null.

Ziya1995 2-Mar-15 11:52am

I can't understand, i need to change a value of Data.speed, it is double and already initialized.
My program works fine if don't do it.

Error happens at the line labeled "exception":
Data.speed = 5; // exception
If i take that line away, the program works fine.

I don't get something?
What can i do?

Thomas Daniels 2-Mar-15 11:55am

I have no idea why that line would change anything, as the InnerException points to another line.

Ziya1995 2-Mar-15 12:07pm

Yes, that is what i can not understand, i can record a video, upload to youtube where you can watch how that exception happens.

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Rob Philpott · Accepted Answer · 2015-03-02T06:03:00

OK, lets go through this. A Static Initializer failure is bodybag material. The type is then useless for the life of the process. It's caused by the static constructor throwing an exception. If you set the debugger to break on first chance exceptions, that'll show you the line.

My bet is it's this:

public static int i4_size = i3_size + Form1.form1.items.itemslength;

Which whilst being inline is set implicitly in the constructor. Static constructors get called the first time the type is 'mentioned' in the execution of code. Here you have one thing with unclear lifetime referencing another thing with unclear lifetime.

Can you not use normal instances instead, such that you can be sure they are instantiated in the correct order?

Static Classes: The type initializer for ' *** ' threw an exception.

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Static Classes: The type initializer for ' *** ' threw an exception.

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