DataGrid Value issues

I honestly cannot see why this seemingly simple click event isn't working.

Code:

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private void button4_Click(object sender, EventArgs e)
        {
            Structs.Point2D[] PointI = new Structs.Point2D[100];
            //Structs.Point2D is just an array of two floats I created, labeled X and Y;
            for(int i = 0; i < dataGridView1.RowCount; i++)
            {
                PointI[i].X = (float)Convert.ToDouble(dataGridView1.Rows[i].Cells["ColumnX"].FormattedValue.ToString());
                PointI[i].Y = (float)Convert.ToDouble(dataGridView1.Rows[i].Cells["ColumnY"].FormattedValue.ToString());
            }
            Console.WriteLine(PointI.ToString());
        }

---

It says that my string input was not in the correct format...

Any ideas?

what doesn't work?

Sorry...rewrote the message to include what the actual error message said haha.

Basically all I'm trying to do is store the value of a DataGridView Cell.

What if dataGridView1 has more than 100 rows? Use "new Structs.Point2D[dataGridView1.RowCount]" instead of "new Structs.Point2D[100]".
You should catch the exception and watch the StackTrace property. It usually tells exactly which line (+/-1) the error lies on.

That is interesting actually...didn't know that you could dynamically change the index of an array. Awesomeness :P

I still have the same unhandled FormatException error.



This is the entire error in detail:

Code:

---

System.FormatException was unhandled
  Message="Input string was not in a correct format."
  Source="mscorlib"
  StackTrace:
      at System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal)
      at System.Number.ParseDouble(String value, NumberStyles options, NumberFormatInfo numfmt)
      at System.Double.Parse(String s, NumberStyles style, NumberFormatInfo info)
      at System.Convert.ToDouble(String value)
      at MathClass_09_30_08.Form1.button4_Click(Object sender, EventArgs e) in C:\Documents and Settings\Tyler Kendrick\My Documents\Visual Studio 2008\Projects\Math Class\MathClass_09_30_08\MathClass_09_30_08\MathClass_09_30_08\Form1.cs:line 145
      at System.Windows.Forms.Control.OnClick(EventArgs e)
      at System.Windows.Forms.Button.OnClick(EventArgs e)
      at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
      at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
      at System.Windows.Forms.Control.WndProc(Message& m)
      at System.Windows.Forms.ButtonBase.WndProc(Message& m)
      at System.Windows.Forms.Button.WndProc(Message& m)
      at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
      at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
      at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
      at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
      at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
      at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
      at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
      at System.Windows.Forms.Application.Run(Form mainForm)
      at MathClass_09_30_08.Program.Main() in C:\Documents and Settings\Tyler Kendrick\My Documents\Visual Studio 2008\Projects\Math Class\MathClass_09_30_08\MathClass_09_30_08\MathClass_09_30_08\Program.cs:line 19
      at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
      at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
      at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
      at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
      at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
      at System.Threading.ThreadHelper.ThreadStart()
  InnerException:

---

Does anyone know a way to return the value of a datagridviewcell as a float?

1) Make a check what type is actually contained in that cell. Something like:

Code:

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throw new System.Exception(dataGridView1.Rows[i].Cells["ColumnX"].Value.GetType().ToString());

---

(the type, prolly "float" or "string", will be shown in the exception message)

2) Consider using "Value" instead of "FormattedValue" as it may contain more than just the value.

I used Value earlier but Value is an object and I can't find a proper cast or convert method to change an object to a float. The type of the formattedValue is just a string, but I can't seem to properly convert a string to a float either....

Any ideas? haha

Datagrids get me mad :P

Code:

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object X = 3.14f;

---

X is an object pointer/reference, but that doesn't mean what it points at is an object. Now go check what GetType returns, as I said :)

And if value is indeed a float, just do:

Code:

---

float X = (float)Value;

---

Well, I found the fix thanks to you. :)

Thank you for your assistance Magos!