Can't access mainwindow class from page?

Suraj Sararf

11y3.9k

i have wpf app which have a mainwindow.xaml and a pages/page1.xaml .Page display on window using frame .window contain a textbox and when i try to give value to this textbox from page1 on button click then nothing happen in textbox . so what should i do?

i am using that code on button click-
Mainwindow.xaml
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:v="clr-namespace:pp.Pages"
Title="MainWindow" MinHeight="350" MinWidth="525"
Background="Transparent">

Page1.xaml
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:v="clr-namespace:pp.Pages"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300"
Title="FileView">

3 Replies

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Piyush Pansuriya11y ago
Accepted answer
Hello,

as per your code, you are initializing new MainWindow(). So its basically two mainwindow you have been created.

Solution :
When MainWindow Load set this in GlobleClass (Static Common Class for all). And give textbox value to that instance.

i.e.
public static class GlobleClass
{
public static MainWindow uc_MainWindow;
}

void MainWindow_Loaded(object sender, RoutedEventArgs e)
{
GlobleClass.uc_MainWindow = this;
}

Page1.xaml.cs
private void Btn_Click(object sender, RoutedEventArgs e)
{
GlobleClass.uc_MainWindow.textbox1.Text="hello";
}
Piyush Pansuriya11y ago
Hello,

Same thing you are repeating again.!! You are initializing class 2 times. so its two different classes.
if you want to pass value to page2, you have to declare variable in page2.

page1.xaml.cs
public page1()
{
                InitializeComponent();
page2.content = "Hello";
}

page2.xaml.cs
        public string content { get; set; }
public page2()
        {
          InitializeComponent();
          this.textbox=content;
        }
Suraj Sararf11y ago
thanks piyush ! its work very well.
i have one more problem in property. i set some value in property on page1 and when call it in page2 then property doesn't have any value.
so what should i do?

variable.cs
        public class Variable
{
public string content { get; set; }
}

page1.xaml.cs

public page1()
{
                InitializeComponent();
          Variable v=new Variable();
          v.content="hello";
}
page2.xaml.cs

public page2()
        {
          InitializeComponent();
          Variable v=new Variable();
          this.textbox=v.content;
        }

But textbox doesn't have any value.