CODEWITHSUNDEEP
c#
Jonathan Brown
Jonathan Brown

Reputation: 55

Inserting text into existing textboxes, like an array

I am reading values from a serial port and would like to place these values in various textboxes on my form.

The textboxes are called:

tbMasterParam0, 
tbMasterParam1, 
tbMasterParam2,
...
tbMasterParam15

I would like to use the fact that they have a numeric naming structure and call them like they were arrays. Is this possible?

I have attached the code to give some context.

Otherwise I am just running a switch/case but this is becoming quite bulky. Surely I can do this in a few lines.

    private void displayBoardValue(byte[] BoardParameters)
    {
        uint measurement;
        string value;
        measurement = (uint)(BoardParameters[3] + (BoardParameters[2] << 8));
        value = measurement.ToString();

        this.Controls[("tbMasterParam" + boardManager.parameter_id)].Text = value;
    }

I seem to be getting a null reference exception

Upvotes: 2

Views: 62

Answers (2)

Dmitrii Bychenko
Dmitrii Bychenko

Reputation: 186823

I'd rather extract a method:

public TextBox FindTextBox(int index) 
{
     // Find corresponding TextBox here 
     // Note .Find(..., true) - scan not only controls on the form, 
     // but all the child panels, groupboxes etc.
     return Controls.Find("tbMasterParam" + index.ToString(), true).First() as TextBox;
}

...

private void displayBoardValue(byte[] BoardParameters)
{
    uint measurement;
    string value;
    measurement = (uint)(BoardParameters[3] + (BoardParameters[2] << 8));
    value = measurement.ToString();

    FindTextBox(boardManager.parameter_id).Text = value;
}

Edit: as far as I can see from the comments, the problem is to scan not only form itself, but child panels, group boxes etc. In that case, you need Controls.Find(, true).

Upvotes: 3

kevintjuh93
kevintjuh93

Reputation: 1010

If I am not mistaken, you can achieve this by using the Find method. Like this: this.Controls.Find()

You might need to cast it to a TextBox.

Upvotes: 1

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