IsolatedStorage客户端独立存储

1.IsolatedStorageSettings 提供一个在独立存储中存储键/值对的 Dictionary<(Of <(<'TKey, TValue>)>)>。

前台代码：

<UserControl x:Class="IsolatedStorageSample.Page"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    FontFamily="Trebuchet MS" FontSize="11"
    Width="500" Height="300">
    <Grid x:Name="LayoutRoot" Background="White">
        <StackPanel VerticalAlignment="Top" >
            <TextBlock x:Name="tbGreeting" FontSize="24" />    
            <StackPanel Height="30" Orientation="Horizontal" Margin="10">
                <TextBlock Text="Name:      " VerticalAlignment="Center"/>
                <TextBox x:Name="tbName" Width="230" Margin="0,0,5,0"/>
                <Button x:Name="btnAddName" Content="Add" Click="btnAddName_Click" />
                <Button x:Name="btnChangeName" Content="Change" Click="btnChangeName_Click" />
                <Button x:Name="btnRemoveName" Content="Remove" Click="btnRemoveName_Click" />
            </StackPanel>
            <StackPanel Height="30" Orientation="Horizontal" Margin="10">
                <TextBlock Text="Settings:   " VerticalAlignment="Center"/>
                <Button x:Name="btnClear" Content="Clear" Click="btnClear_Click" />
                <Button x:Name="btnCount" Content="Count" Click="btnCount_Click" />
                <Button x:Name="btnKeys" Content="Get Keys" Click="btnKeys_Click" />
                <Button x:Name="btnValues" Content="Get Values" Click="btnValues_Click" />
            </StackPanel>
            <StackPanel Height="30" Orientation="Horizontal" Margin="10">
                <TextBlock Text="Results:    " VerticalAlignment="Center"/>
                <TextBox x:Name="tbResults" Width="230" Margin="0,0,5,0"/>
            </StackPanel>
        </StackPanel>
    </Grid>
</UserControl>

后台代码:

using System;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.IO.IsolatedStorage;

namespace IsolatedStorageSample
{
    public partial class Page : UserControl
    {
        private IsolatedStorageSettings userSettings = IsolatedStorageSettings.ApplicationSettings;

        public Page()
        {
            InitializeComponent();

            // Retrieve and set user name.
            try
            {
                string name = (string)userSettings["name"];
                tbGreeting.Text = "Hello, " + name;
            }
            catch (System.Collections.Generic.KeyNotFoundException)
            {
                // No preference is saved.
                tbGreeting.Text = "Hello, World";
            }
        }

        private void btnAddName_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                userSettings.Add("name", tbName.Text);
                tbResults.Text = "Name saved. Refresh page to see changes.";
            }
            catch (ArgumentException ex)
            {
                tbResults.Text = ex.Message;
            }
        }

        private void btnChangeName_Click(object sender, RoutedEventArgs e)
        {
            userSettings["name"] = tbName.Text;
            tbResults.Text = "Name changed. Refresh page to see changes.";
        }

        private void btnRemoveName_Click(object sender, RoutedEventArgs e)
        {
            if (userSettings.Remove("name") == true)
            {
                tbResults.Text = "Name removed. Refresh page to see changes.";
            }
            else
            {
                tbResults.Text = "Name could not be removed. Key does not exist.";
            }

        }

        private void btnClear_Click(object sender, RoutedEventArgs e)
        {
            userSettings.Clear();
            tbResults.Text = "Settings cleared. Refresh page to see changes.";
        }

        private void btnCount_Click(object sender, RoutedEventArgs e)
        {
            tbResults.Text = "Count: " + userSettings.Count();
        }

        private void btnKeys_Click(object sender, RoutedEventArgs e)
        {
            System.Text.StringBuilder sb = new System.Text.StringBuilder("Keys: ");

            foreach (string k in userSettings.Keys)
            {
                sb.Append(k + "; ");
            }
            tbResults.Text = sb.ToString();
        }

        private void btnValues_Click(object sender, RoutedEventArgs e)
        {
            System.Text.StringBuilder sb = new System.Text.StringBuilder("Values: ");

            foreach (Object v in userSettings.Values)
            {
                sb.Append(v.ToString() + "; ");
            }
            tbResults.Text = sb.ToString();
        }
    }
}

 

  if (!appSettings.Contains("UserName"))
                {
                    appSettings.Add("UserName", string.Empty);
                }
                appSettings["UserName"] = UserName.Text;
                StatusIndicator.Text = "Saved Username!";
 if (appSettings.Contains("UserName"))
            {
                UserName.Text = appSettings["UserName"].ToString();
                StatusIndicator.Text = "User name loaded from IsoStore.";
            }