C#•2y ago

❔ Setting Up First Xamarin FOrms

trying to follow a xamarin forms tutorial on creating a mobile app...but I am getting these errors

        public LoginPage()
        {
            var vm = new LoginViewModel();
            this.BindingContext = vm;
            vm.DisplayInvalidLoginPrompt += () => DisplayAlert("Error", "Invalid Credentials", "OK");
            
            InitializeComponent(); 

            Email.Completed += (object sender, EventArgs e) =>
            {
                Password.Focus();
            };

            Password.Completed += (object sender, EventArgs e) =>
            {
                vm.SubmitCommand.Execute(null);
            };
        }

        public LoginPage()
        {
            var vm = new LoginViewModel();
            this.BindingContext = vm;
            vm.DisplayInvalidLoginPrompt += () => DisplayAlert("Error", "Invalid Credentials", "OK");
            
            InitializeComponent(); 

            Email.Completed += (object sender, EventArgs e) =>
            {
                Password.Focus();
            };

            Password.Completed += (object sender, EventArgs e) =>
            {
                vm.SubmitCommand.Execute(null);
            };
        }

errors =>

The name InitializeComponent does not exist in the current context
Email does not contain a definition for Completed
The name Password does not exist in the current context

The name InitializeComponent does not exist in the current context
Email does not contain a definition for Completed
The name Password does not exist in the current context

10 Replies

PraetorBlue•2y ago

You're using a bunch of variables and methods you never defined anywhere.

Accord•2y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

FoxTrotCharlieZulu•2y ago

This is the guide I'm following...where is it shown to do that? https://www.c-sharpcorner.com/article/xamarin-forms-create-a-login-page-mvvm/

Xamarin.Forms - Create A Login Page (MVVM)

In this code we created the followings properties: Email, Password and the command SubmitCommand() that we will use in the Login command button in the Login page. We use the ICommand interface that allows defining and implementing a command what we call commanding.

PraetorBlue•2y ago

Looks like you may have: - Skipped the beginning of step 4 with all the XML stuff - Failed to derive from the appropriate base class class LoginPage : ContentPage and possible you skipped more than that too hard to say

.bobgoblin•2y ago

okay - i'll start back at the beginning and see....

.bobgoblin•2y ago

@PraetorBlue - I have that code for step 4...Let me show you... LoginPage.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"  
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"  
             x:Class="XF_Login.Views.LoginPage"  
             BackgroundImage="logo.jpg">
    <ContentPage.Content>
        <StackLayout Orientation="Vertical" Padding="30" Spacing="40">
            <BoxView HeightRequest="10"/>
            <Image HorizontalOptions="Center" WidthRequest="300" Source="maco.jpg"/>
            <Frame BackgroundColor="#BF043055" HasShadow="False">
                <StackLayout Orientation="Vertical" Spacing="10">
                    <Entry x:Name="Email" Text="{Binding Email}" Placeholder="Email"   
                           PlaceholderColor="White" HeightRequest="40"   
                           Keyboard="Email"  
                           TextColor="White"/>
                    <Entry x:Name="Password" Text="{Binding Password}" Placeholder="Senha"   
                           PlaceholderColor="White" HeightRequest="40"   
                           IsPassword="True"  
                           TextColor="White"/>
                </StackLayout>
            </Frame>
            <Button Command="{Binding SubmitCommand}" Text="Login" TextColor="White"  
                    FontAttributes="Bold" FontSize="Large" HorizontalOptions="FillAndExpand"  
                    BackgroundColor="#088da5" />
        </StackLayout>
    </ContentPage.Content>
</ContentPage>

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"  
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"  
             x:Class="XF_Login.Views.LoginPage"  
             BackgroundImage="logo.jpg">
    <ContentPage.Content>
        <StackLayout Orientation="Vertical" Padding="30" Spacing="40">
            <BoxView HeightRequest="10"/>
            <Image HorizontalOptions="Center" WidthRequest="300" Source="maco.jpg"/>
            <Frame BackgroundColor="#BF043055" HasShadow="False">
                <StackLayout Orientation="Vertical" Spacing="10">
                    <Entry x:Name="Email" Text="{Binding Email}" Placeholder="Email"   
                           PlaceholderColor="White" HeightRequest="40"   
                           Keyboard="Email"  
                           TextColor="White"/>
                    <Entry x:Name="Password" Text="{Binding Password}" Placeholder="Senha"   
                           PlaceholderColor="White" HeightRequest="40"   
                           IsPassword="True"  
                           TextColor="White"/>
                </StackLayout>
            </Frame>
            <Button Command="{Binding SubmitCommand}" Text="Login" TextColor="White"  
                    FontAttributes="Bold" FontSize="Large" HorizontalOptions="FillAndExpand"  
                    BackgroundColor="#088da5" />
        </StackLayout>
    </ContentPage.Content>
</ContentPage>

LoginPage.xaml.cs -> https://pastebin.com/Lk7PKASc

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.bobgoblin•2y ago

This is the project I have.....maybe you can see error in my code?

App1.7z

Accord•2y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

.bobgoblin•2y ago

@PraetorBlue - any insight?

Accord•2y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ Setting Up First Xamarin FOrms