How to get Content in MAUI Class Library?

Question

Hi,

I have below code in my MAUI Class Library but the name Content does not exists

Kindly help..

namespace TempMAUIClass;  
  
using Microsoft.Maui.Controls;  
  
// All the code in this file is included in all platforms.  
public class Class1  
{  
    public static void GoTo()  
    {  
        var label = new Label { ... };  
        var button = new Button { ... };  
  
        var layout = new StackLayout();  
  
        layout.Children.Add(label);  
        layout.Children.Add(button);  
  
        Content = layout;  
          
        Application.Current.MainPage = content;  
    }  
}

Thanks,
Jassim

Answer

Hello @Jassim Al Rahma ,

Content is the property of ContentPage. If you want to call Content in Class1, the Class1 should be derived from ContentPage.

public class Class1: ContentPage{...}

In addition, you use the Content in the static GoTo() method. But the Content is a property 'member' of ContentPage, only a ContentPage object can reference it. This will result in compiler error CS0120.

public void GoTo()  
     {   .......  
         Content = layout;  
         ......  
     }

Further more, you set Application.Current.MainPage = content, Application.Current.MainPage is of type Microsoft.Maui.Controls.Page, but content is of type Microsoft.Maui.Controls.View. You can set Application.Current.MainPage = this; , or set any other pages.

------------Update---------------

You got the blank page because you created a new Signin page but you haven't call the GoTo() method, you can try

Signin myPage = new Signin();   
myPage.GoTo();

how can I just do:MyClass.Signin();to set the Page?

You would like to make a static class and call the static method, please refer to the following code :
First, you can create a static class named MyClass, then add the static method named Sigin() for it:

public static class MyClass  
{  
 public static void Signin()  
    {  
        Signin myPage = new Signin();  
        //myPage.GoTo();  if you don't want to call the GoTo() method here, you can move it to the Constructor of Signin page  
        Application.Current.MainPage = myPage;  
    }  
}

The Signin page:

public class Signin : ContentPage   
{  
    public Signin()// Constructor method  
    {  
        this.GoTo(); //if you have called myPage.GoTo() above, you don't have to call this method again  
     }  
   public void GoTo()  
         {   .......  
             Content = layout;  
             // Application.Current.MainPage = this;   the MainPage has been set in the static Signin() method above  
         }  
}

For more information, please see:

Instance constructors - C# programming guide | Microsoft Learn
Static Classes and Static Class Members - C# Programming Guide | Microsoft Learn
Compiler Error CS0120 | Microsoft Learn
ContentPage - .NET MAUI | Microsoft Learn

Best Regards,
Wenyan Zhang

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How to get Content in MAUI Class Library?

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