How to change devexpress controls value and proprieties using external function

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hi,

how to change devexpress control value and proprieties exist in Variable form ( unknown ) using public function in another class ..
ex:-

i have 3 devexpess controls (label , simple button , ComboBoxEdit), and 5 form that contains this 3 controls (with same names)..

also i have another class that contains a function , how to change the 3 controls value and proprieties when i call this function in every form (when needed)?

What I have tried:

i tried this:

public static void  Search<T>(this XtraForm frm, IQueryable<T> query, BindingSource bindingsource, int currentPage = 1) where T : class
        {
frm.Controls["PAG_CountPerPage"].EditValue = "";
frm.Controls["PAG_CountPerPage"].SelectedText = "";
}

but Control does not contain definition for EditValue , SelectedText ,....

Posted 10-Mar-19 12:46pm

Golden Basim

Updated 10-Mar-19 22:18pm

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[no name] 11-Mar-19 0:49am

I see no relation between what you "say" you want and what you say you "tried".

Golden Basim 11-Mar-19 5:04am

i'm sorry maybe i failed to explain what i want .. what i want is like that

 frm.Controls["PAG_CountPerPage"].EditValue = "";

1 solution

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Ralf Meier · Answer 1 · 2019-03-10T22:18:00

Solution 1

'frm.Controls' delivers you an Object - not the real control you want to have.
So you have to cast it, if the Type matches, into the right Type to get/access the Properties you like to have.

Sample-code for this :

C#

Label myLabel;
if (this.Controls("Label1").GetType == typeof(Label))
    myLabel = this.Controls("Label1");

ComboBox myCombobox;
if (this.Controls("ComboBox1").GetType == typeof(ComboBox))
    myCombobox = this.Controls("ComboBox1");

Now you can access the member "Label1" from the Controls-Collection (of the current Form) by "myLabel"
The same is with "myComboBox".
Of course - you use different controls - but the making is the same.

If one of this Variables (myLabel or myCombobox) is Nothing there is no such member inside the Controls-Collection of your Form.

Posted 10-Mar-19 22:18pm

Ralf Meier

Updated 11-Mar-19 9:37am

v2

Comments

Golden Basim 11-Mar-19 5:05am

please can you show , how i can to do that ?

Golden Basim 11-Mar-19 6:03am

i tried that but i failed

ComboBoxEdit PAG_CountPerPage = frm.Controls["PAG_CountPerPage"] as ComboBoxEdit;
            PAG_CountPerPage.SelectedIndex = 3;

Ralf Meier 11-Mar-19 7:08am

Your code is a mix of VB and C# ...
In the moment I don't have a Visual Studio Version to use.
Also I'm not familiar enough with C# to give you a 'quick-and-dirty'-example.
Later (in the evening) I will create an example for you ...

Golden Basim 11-Mar-19 8:42am

thanks
also i tried this code to check if the from have an issue or no >>

frm.Close();

and

frm.text = "change text";

and the code don't run , no thing happen no errors appear

Ralf Meier 11-Mar-19 15:37pm

I added a/the code-sample ...

Golden Basim 12-Mar-19 5:59am

Error CS1955 Non-invocable member 'Control.Controls' cannot be used like a method.

Ralf Meier 12-Mar-19 7:08am

a little bit more Info would be useful - so show the complete relevant code. Use the 'Improve Question' widget to improve your Question with this code-parts ...