C＃标签文本的方法不变

Question

I am new in the middle of the c#.

I have a problem, I want to change the text of a textboxbut I do not happen I have to look on the forum but nothing helped me. Your help will be welcome.

create textbox:

        TextBox _DysplayRulsR = new TextBox();

        _DysplayRulsR.Text = "Hello message";
        _DysplayRulsR.VerticalAlignment = VerticalAlignment.Top;
        _DysplayRulsR.HorizontalAlignment = HorizontalAlignment.Center;
        _DysplayRulsR.Background = Brushes.Transparent;
        _DysplayRulsR.BorderBrush = Brushes.Transparent;
        _DysplayRulsR.IsReadOnly = true;
        _DysplayRulsR.Foreground = Brushes.White;
        _DysplayRulsR.BorderThickness = new Thickness(0, 0, 0, 0);
        _DysplayRulsR.Margin = new Thickness(0, 15, 0, 0);
        _DysplayRulsR.Width = 900;
        _DysplayRulsR.Height = 300;
        _DysplayRulsR.FontSize = 30;
        _DysplayRulsR.TextAlignment = TextAlignment.Center;
        _ContentGrid.Children.Add(_DysplayRulsR);

_ContentGrid = Grid

method change textbox text:

     public static void UpdateRules(string status)
    {
        _DysplayRulsR.Text = "done";
    }

The label is displayed well the method and well used but the text of the textbox_DysplayRuls does not want to change.

Sorry for my approximate English I'm really not strong for translation.

Answer 1

You need to change the Text property of your TextBox .

Example:

public static void UpdateRules(string status)
{
    _TextRules.Text = "done";
} 

However you did show _DysplayRuls as the name of your TextBox in your above initialization code. Make sure you replace _TextRules in my example with whatever TextBox you want to change.

Answer 2

You need to assign a new value to the Text property of your _DysplayRuls TextBox instance.

public static void UpdateRules(string status)
{
    _DysplayRuls.Text = "done";
}

Answer 3

You have an issue with naming conventions. This may seem like a nit, but in this case it is a clue to the overall problem.

This line:

TextBox _DysplayRulsR = new TextBox();

...smells bad. If a variable name begins with an underscore, it should be a member variable. Some devs think the underscore is unnecessary, but that is a different point; if you're going to use them at all, they should not be used for local variables.

This leads me to believe that this line:

public static void UpdateRules(string status)
{
    _DysplayRulsR.Text = "done";
}

...is actually referencing a different textbox with a name of _DysplayRulsR but at member, not local, scope.

So you have two options:

Change this

TextBox _DysplayRulsR = new TextBox();

to this:

_DysplayRulsR = new TextBox();

OR

Add this to your first block of code:

_DysplayRulsR.Name = "_DysplayRulsR";

And change this:

public static void UpdateRules(string status)
{
    _DysplayRulsR.Text = "done";
}

to this:

public static void UpdateRules(string status)
{
    _ContentGrid.Children.FindControl("_DysplayRulsR").Text = "done";
}