Set or raise Validation.HasE rror to highlight textbox from a method...

[HenrikL]

Hi.

I have a textbox that have a binding on it with converter and validationrules .

When a validation error ouccur the foreground of the textbox will change to red cause it has a style.triggers that are connect to it and it works as it should..

What I wanna to do it in some special case I wan to test tb.Text.Equals( "myTestStr" ) or if the text lenght too large etc.. and I wanna same behave as a validation has error on the textbox if the textbox not ok on check, if understand what i mean.

For examble.

private void OnTargetUpdated(object sender, DataTransferEventArgs e)
        {
            if (sender is TextBox)
            {
                TextBox tb = sender as TextBox;
                BindingExpression bindExp = tb.GetBindingExpression(TextBox.TextProperty);
 
                if (tb.text.lenght > 10)
                {
 
                    XsToLargeRule rule = new XsToLargeRule();
 
                    ValidationError validationError = new ValidationError(rule, bindExp);
 
                    validationError.RuleInError = rule;
                    validationError.ErrorContent = "TOO LARGE STRING";
 
                    tb.Text = "########";
                    Validation.MarkInvalid(bindExp, validationError);
                    tb.UpdateLayout(); 
                }
            }
        }

XsToLargeRule is a dummy method that allways return new System.Windows. Controls.Valida tionResult(fals e, "Too Large string");

But it is not working. The textbox text changed to "#####" but with no style foreground change.

Please help, what I wanna to know is how to mark a textbox as invalid that have validation error from code behind and trigger the style change without useing binding generate validationrules .

[tlhintoq]

TIP: When you are writing your question, there is a button on the tool bar that wraps the [code] tags around your copy/pasted code. It helps a bunch. Its the button with a '#' on it. More on tags. They're cool. Check'em out.

[tlhintoq]

I doubt this is the code you are actually compiling and using.
Line 8. the property is .Length not .lenght That will throw an error right there and not run.

[HenrikL]

Tnx for the tip and correction.. the code is just for a examble

But the question still are the same I will somehow set a textbox to have validation error with a error message and trigger style change.


Excuse me for my bad english :)

[tlhintoq]

Your English is fine. Far better than my foreign language skills.

the code is just for a examble

That may be, but its hard to help fix someone's code when it isn't actually the code they are using and having the problem with.

If you put a breakpoint at line 18 and walk through the code line by line do you find any errors being thrown? Maybe the validation your are creating and throwing isn't formed correctly? Does the validation error event get triggered when you throw the .MarkInvalid ?