NumericUpDown List and Button List . How to link them ?

Hi Catalin

 

Your problem isn’t occurring in the code you provided to us because the code btnList[i].Click += (se, ev) => { numUpDnList[i].UpButton(); } isn’t present in the flow of execution.

Its reasonable to assume that this code is being executed elsewhere in your class. Wherever that is, the value of i representing the btnList index and/or numUpDnList index does not exist.

 

For example, let’s assume maxv is 5.

 

Your program draws 5 buttons and draws 5 UpDownNumber controls.

 

These controls are collected in btnList and numUpDnList respectively.

 

The indexes in each list would be 0, 1, 2, 3, 4 for a total of 5 controls in each List.

 

Next you register each button’s click event to the UpDownNumber’s UpButton method.

 

During registration, using my example of indexes: 0, 1, 2, 3 and 4 the value of i at some point in time during code execution goes below 0 or goes above 4. For example, the value of i changes to -1 or it could change to 5. When that happens, you get System.ArgumentOutOfRangeException. The index goes out range.

 

Within Range - Good

 

btnList[0].Click += (se, ev) => { numUpDnList[0].UpButton(); }

btnList[1].Click += (se, ev) => { numUpDnList[1].UpButton(); }

btnList[2].Click += (se, ev) => { numUpDnList[2].UpButton(); }

btnList[3].Click += (se, ev) => { numUpDnList[3].UpButton(); }

btnList[4].Click += (se, ev) => { numUpDnList[4].UpButton(); }

 

Out of Range: Exception - Bad

 

btnList[5].Click += (se, ev) => { numUpDnList[5].UpButton(); }

 

Hope this help you.

Hello , first i don't think it matters who is maxv since maxv is the same for both lists

but this is the rest of the code :

Hi,

This error occurs when you try to access an element of a collection which is outside of its bounds (e.g. element 5 of a 4 element array).

Share your implementation details of maxv which your comparing in your for loop with i.