使用Application.Current.Properties存储数据

Question

我有一个注册页面。首先，用户输入他的信息，如电子邮件，密码，体重，身高。。。用户填写完此表单后，我想从该页面导航到我的登录页面。(导航部分可以，我可以处理(。

但是，我不知道如何使用Application.Current.Properties选项存储电子邮件、密码组合，然后在登录页面中使用这些信息进行输入。

我正在添加我的注册页面代码。如果你有任何想法或建议，我愿意接受。

<?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="HealNow.Signup"
NavigationPage.HasNavigationBar="False">
<ContentPage.Resources>
<ResourceDictionary>
<LinearGradientBrush x:Key="Theme" EndPoint="0,1">
<GradientStop Color="#48b6a6" Offset="0.1" />
<GradientStop Color="#2b78d4" Offset="1.0" />
</LinearGradientBrush>
</ResourceDictionary>
</ContentPage.Resources>
<ContentPage.Padding>
<OnPlatform x:TypeArguments="Thickness" iOS="0, 20, 0, 0">
</OnPlatform>
</ContentPage.Padding>
<StackLayout Background="{StaticResource Theme}">
<StackLayout Background="{StaticResource Theme}" >
</StackLayout>
<StackLayout Margin="0,35,0,0">
<Image HorizontalOptions="Center"    HeightRequest="60" WidthRequest="60" Source="heartbeatt.png" ></Image>
</StackLayout>
<StackLayout Padding="0" Margin="10,20,10,0" HorizontalOptions="FillAndExpand" >
<Frame BackgroundColor="Transparent" HeightRequest="600" Padding="0" Margin="0">
<StackLayout>

<StackLayout Padding="0" Margin="15,10">
<Frame BackgroundColor="Transparent" BorderColor="White" Padding="0" HorizontalOptions="FillAndExpand" CornerRadius="30">
<StackLayout Orientation="Horizontal">
<Frame BackgroundColor="Transparent" HeightRequest="40" WidthRequest="40" CornerRadius="30" Padding="0" Margin="5">
<Image Source="user.png" Aspect="AspectFill" Margin="0"/>
</Frame>
<Entry x:Name ="email" Placeholder="Email" TextColor="#666666" FontAttributes="None" HorizontalOptions="FillAndExpand" Margin="0,0,20,0" Completed="OnChange"/>
</StackLayout>
</Frame>
<Frame BackgroundColor="Transparent" BorderColor="White" Margin="0,12,0,0" Padding="0" HorizontalOptions="FillAndExpand" CornerRadius="30">
<StackLayout Orientation="Horizontal">
<Frame BackgroundColor="Transparent" HeightRequest="40" WidthRequest="40" CornerRadius="30" Padding="0" Margin="5">
<Image Source="broken.png" Aspect="AspectFill" Margin="0"/>
</Frame>
<Entry x:Name ="password" Placeholder="Password" IsPassword="True" TextColor="White" FontAttributes="None" HorizontalOptions="FillAndExpand" Margin="0,0,20,0" Completed="OnChange"/>
</StackLayout>
</Frame>

<Frame BackgroundColor="Transparent" BorderColor="White" Margin="0,12,0,0" Padding="0" HorizontalOptions="FillAndExpand" CornerRadius="30">
<StackLayout Orientation="Horizontal">
<Frame BackgroundColor="Transparent" HeightRequest="40" WidthRequest="40" CornerRadius="30" Padding="0" Margin="5">
<Image Source="babyy.png" Aspect="AspectFill"  Margin="0"/>
</Frame>
<Entry Placeholder="Date of Birth"  TextColor="White" FontAttributes="None" HorizontalOptions="FillAndExpand" Margin="0,0,20,0"/>
</StackLayout>
</Frame>
<Frame BackgroundColor="Transparent" Margin="0,12,0,0" BorderColor="White" Padding="0" HorizontalOptions="FillAndExpand" CornerRadius="30">
<StackLayout Orientation="Horizontal">
<Frame BackgroundColor="Transparent" HeightRequest="40" WidthRequest="40" CornerRadius="30" Padding="0" Margin="5">
<Image Source="barrr.png" Aspect="AspectFill" Margin="0"/>
</Frame>
<Entry Placeholder="Weight" TextColor="#666666" FontAttributes="None" HorizontalOptions="FillAndExpand" Margin="0,0,20,0"/>
</StackLayout>
</Frame>
<Frame BackgroundColor="Transparent" Margin="0,12,0,0" BorderColor="White" Padding="0" HorizontalOptions="FillAndExpand" CornerRadius="30">
<StackLayout Orientation="Horizontal">
<Frame BackgroundColor="Transparent" HeightRequest="40" WidthRequest="40" CornerRadius="30" Padding="0" Margin="5">
<Image Source="height.png" Aspect="AspectFill" Margin="0"/>
</Frame>
<Entry Placeholder="Height" TextColor="#666666" FontAttributes="None" HorizontalOptions="FillAndExpand" Margin="0,0,20,0"/>
</StackLayout>
</Frame>

<Button Margin="30" Text="SIGN UP" BackgroundColor="#2a52be" TextColor="White" CornerRadius="30" Clicked="Button_Clicked" />



</StackLayout>
</StackLayout>
</Frame>

</StackLayout>
</StackLayout>
</ContentPage>

看起来像这个

注册.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;
namespace HealNow
{
[XamlCompilation(XamlCompilationOptions.Compile)]
public partial class Signup : ContentPage
{
public Signup()
{
InitializeComponent();
Application.Current.Properties[email.Text] = password.Text;
if (Application.Current.Properties.ContainsKey("Email"))
{
var email = Application.Current.Properties["Email"] as string;
}
if (Application.Current.Properties.ContainsKey("Password"))
{
var password = Application.Current.Properties["Password"] as string;
}
}
private async void Button_Clicked(object sender, EventArgs e)
{
await Navigation.PushAsync(new MainPage());
}
private void OnChange(object sender, EventArgs e)
{
Application.Current.Properties["Email"] = email.Text;
Application.Current.Properties["Password"] = password.Text;
Application.Current.SavePropertiesAsync();
}
protected override void OnDisappearing()
{
base.OnDisappearing();
}
}
}

主页.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="HealNow.MainPage"
NavigationPage.HasNavigationBar="False">
<ContentPage.Padding>
<OnPlatform x:TypeArguments="Thickness" iOS="0, 20, 0, 0">
</OnPlatform>
</ContentPage.Padding>
<StackLayout>
<StackLayout.Background>
<LinearGradientBrush x:Name="Theme" EndPoint="0,1">
<GradientStop Color="#48b6a6" Offset="0.1" />
<GradientStop Color="#2b78d4" Offset="1.0" />
</LinearGradientBrush>
</StackLayout.Background>
<StackLayout Margin="0,35,0,0">
<Image HorizontalOptions="Center"    HeightRequest="60" WidthRequest="60" Source="heartbeatt.png" ></Image>
</StackLayout>
<StackLayout Padding="0" Margin="10,20,10,0" HorizontalOptions="FillAndExpand" >
<Frame BackgroundColor="Transparent" HeightRequest="600" Padding="0" Margin="0">
<StackLayout>
<StackLayout Padding="0" Margin="15,10">
<Frame BackgroundColor="Transparent" BorderColor="White" Padding="0" HorizontalOptions="FillAndExpand" CornerRadius="30">
<StackLayout Orientation="Horizontal">
<Frame BackgroundColor="Transparent" HeightRequest="40" WidthRequest="40" CornerRadius="30" Padding="0" Margin="5">
<Image Source="user.png" Aspect="AspectFill" Margin="0"/>
</Frame>
<Entry x:Name="email2"  Placeholder="Email" TextColor="#666666" FontAttributes="None" HorizontalOptions="FillAndExpand" Margin="0,0,20,0"/>
</StackLayout>
</Frame>
<Frame BackgroundColor="Transparent" BorderColor="White" Margin="0,15,0,0" Padding="0" HorizontalOptions="FillAndExpand" CornerRadius="30">
<StackLayout Orientation="Horizontal">
<Frame BackgroundColor="Transparent" HeightRequest="40" WidthRequest="40" CornerRadius="30" Padding="0" Margin="5">
<Image Source="broken.png" Aspect="AspectFill" Margin="0"/>
</Frame>
<Entry x:Name="password2" Placeholder="Password" IsPassword="True" TextColor="White" FontAttributes="None" HorizontalOptions="FillAndExpand" Margin="0,0,20,0"/>
</StackLayout>
</Frame>
<StackLayout  Orientation="Horizontal">
<CheckBox IsChecked="False" Color="White" />
<Label Text="Remember me" TextColor="White" FontSize="10" VerticalTextAlignment="Center" HorizontalTextAlignment="Center" />
<Label Text="Forgot Password" TextColor="White"  HorizontalOptions="EndAndExpand" FontSize="10" VerticalTextAlignment="Center" HorizontalTextAlignment="Center" />
</StackLayout>
<Button Margin="10" Text="SIGN IN" BackgroundColor="#2b78d4" TextColor="White" CornerRadius="30" Clicked="Button_Clicked" />
<StackLayout Orientation="Horizontal" HorizontalOptions="CenterAndExpand">
<Label Text="Still Not Connected ?" TextColor="White" FontSize="10"/>
<Button Margin="0,-17,0,0" Text="Sign Up" TextColor="White" FontAttributes="Bold" FontSize="10" BackgroundColor="Transparent" Clicked="Button_Clicked2" />
</StackLayout>
<StackLayout Margin="0,25,0,0" Padding="0">
<Grid>
<BoxView BackgroundColor="White" HeightRequest="1" WidthRequest="150"  HorizontalOptions="Center" VerticalOptions="Center"/>
<Frame BackgroundColor="White" HeightRequest="45" WidthRequest="45" CornerRadius="45" HasShadow="False" BorderColor="White" Margin="0" HorizontalOptions="Center" Padding="0">
<Label Text="OR" TextColor="#666666" FontSize="Small" VerticalTextAlignment="Center" HorizontalTextAlignment="Center"/>
</Frame>
</Grid>
</StackLayout>
<StackLayout Margin="0,25" Orientation="Horizontal" HorizontalOptions="CenterAndExpand">
<Frame BackgroundColor="Transparent" HeightRequest="45" WidthRequest="45" CornerRadius="45" HasShadow="False" BorderColor="White" Margin="0" HorizontalOptions="Center" Padding="0">
<Image Source="https://www.pngitem.com/pimgs/m/44-440455_transparent-background-fb-logo-hd-png-download.png" Aspect="AspectFill" Margin="0"/>
</Frame>
<Frame BackgroundColor="Transparent" HeightRequest="45" WidthRequest="45" CornerRadius="45" HasShadow="False" BorderColor="White" Margin="0" HorizontalOptions="Center" Padding="0">
<Image Source="https://blog.hubspot.com/hubfs/image8-2.jpg" Aspect="AspectFill" Margin="0"/>
</Frame>
</StackLayout>
</StackLayout>
</StackLayout>
</Frame >
</StackLayout>
</StackLayout >
</ContentPage>

主页.xaml.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Xamarin.Forms;
namespace HealNow
{
public partial class MainPage : ContentPage
{
public MainPage()
{
InitializeComponent();
}
private async void Button_Clicked(object sender, EventArgs e)
{
await Navigation.PushAsync(new WelcomePage());
}
private async void Button_Clicked2(object sender, EventArgs e)
{
await Navigation.PushAsync(new Signup());
}
}
}

Answer 1

正如Jason上面给出的文档所说，您只需要使用Properties字典来使用string键保存数据。

在您的情况下，如果您只想存储您的电子邮件和密码：

<Entry x:Name ="email" Placeholder="Email" TextColor="#666666" FontAttributes="None" HorizontalOptions="FillAndExpand" Margin="0,0,20,0"/>
<Entry x:Name="password" Placeholder="Password" IsPassword="True" TextColor="White" FontAttributes="None" HorizontalOptions="FillAndExpand" Margin="0,0,20,0"/>

成功注册后：

Application.Current.Properties["Email"] = email.Text;
Application.Current.Properties["Password"] = password.Text;

并读取数据：

if (Application.Current.Properties.ContainsKey("Email"))
{
var email= Application.Current.Properties ["Email"] as string;

}
if (Application.Current.Properties.ContainsKey("Password"))
{
var password = Application.Current.Properties ["Password"] as string;

}

如果您想将电子邮件与密码配对。您可以使用emial作为密钥，使用密码作为值。

Application.Current.Properties[email.Text] = password.Text;

然后当你想在登录页面中检查电子邮件和密码时：

if (Application.Current.Properties.ContainsKey(the email you entered))
{
var password = Application.Current.Properties [the email you entered] as string;
// then you could check that the saved password matches the one you entered
}