Question

我正在尝试下载JSON字符串并将其分配给TextArea：

private async void KliknijMnie_Click(object sender, RoutedEventArgs e)
{
    try
    {
        ProgressBarRequest.Visibility = System.Windows.Visibility.Visible;

        HttpClient client = new HttpClient();

        HttpResponseMessage response = await client.GetAsync("http://someurl.with?parameters=inURL");
        response.EnsureSuccessStatusCode();
        var responseBody = await response.Content.ReadAsStringAsync();

        var root1 = JsonConvert.DeserializeObject<uzytkownika>(responseBody);
        this.DataContext = root1;

        //fileName.Text = root1;
    }
    catch
    {
        string responseBody = "some errors";
    }
    finally
    {
        ProgressBarRequest.Visibility = System.Windows.Visibility.Collapsed;
    }
}

class'uzytkownika'：

public class Day1
{
    public int @int { get; set; }
    public string str { get; set; }
    public string color { get; set; }
    public object text { get; set; }
    public string czas { get; set; }
    public bool funkcje { get; set; }
}

public class Day2
{
    public int @int { get; set; }
    public string str { get; set; }
    public string color { get; set; }
    public object text { get; set; }
    public string czas { get; set; }
    public bool funkcje { get; set; }
}

public class Day3
{
    public int @int { get; set; }
    public string str { get; set; }
    public string color { get; set; }
    public object text { get; set; }
    public string czas { get; set; }
    public bool funkcje { get; set; }
}

(....)

public class Day30
{
    public int @int { get; set; }
    public string str { get; set; }
    public string color { get; set; }
    public object text { get; set; }
    public string czas { get; set; }
    public bool funkcje { get; set; }
}

public class Grafik
{
    public Day1 day1 { get; set; }
    public Day2 day2 { get; set; }
    public Day3 day3 { get; set; }
    (....)
    public Day30 day30 { get; set; }
}

public class uzytkownika
{
    public string imie { get; set; }
    public string nazwisko { get; set; }
    public bool status { get; set; }
    public string msg { get; set; }
    public string miesiacTXT { get; set; }
    public string lastUpdate { get; set; }
    public string updatedBy { get; set; }
    public Grafik grafik { get; set; }
}

和网格：

<Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
    <Button Name="KliknijMnie" Margin="10,10,254,507" Click="KliknijMnie_Click">pobierz dane</Button>
    <StackPanel Margin="0,143,0,10">
        <StackPanel Orientation="Horizontal">
            <TextBlock Width="200" Text="First name"></TextBlock>
            <TextBlock Text="{Binding imie}" Width="230"></TextBlock>
        </StackPanel>
    </StackPanel>
    <StackPanel Margin="0,143,0,10">
        <StackPanel Orientation="Horizontal">
            <TextBlock Width="200" Text="LastName"></TextBlock>
            <TextBlock Text="{Binding nazwisko}" Width="230"></TextBlock>
        </StackPanel>
    </StackPanel>
</Grid>

怎么了？为什么root1未分配给textblock？

Answer 1

您可以使用以下代码作为参考。假设您需要使用facebook graph API

在文本块中显示用户名

private void KliknijMnie_Click(object sender, RoutedEventArgs e)
    {
        WebClient webClient = new WebClient();
        webClient.DownloadStringCompleted += webClient_DownloadStringCompleted;
        ProgressBarRequest.Visibility = System.Windows.Visibility.Visible;
        webClient.DownloadStringAsync(new Uri("http://graph.facebook.com/stackoverflow"));
    }

    void webClient_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
    {
        try
        {
            if (!string.IsNullOrEmpty(e.Result))
            {
                var root1 = JsonConvert.DeserializeObject<RootObject>(e.Result);
                this.DataContext = root1;
       }
    }
 }

和json解析器类（RootObject.cs）文件应该是这样的，你也可以使用json2csharp.com来创建更多的json解析器类。所有已解析的数据都存储在root1中，您可以进一步创建对它的引用。

public class Location
{
public string street { get; set; }
public string city { get; set; }
public string state { get; set; }
public string country { get; set; }
public string zip { get; set; }
}

public class Cover
{
public long cover_id { get; set; }
public string source { get; set; }
public int offset_y { get; set; }
public int offset_x { get; set; }
}

public class RootObject
{
public string about { get; set; }
public string category { get; set; }
public string founded { get; set; }
public bool is_published { get; set; }
public Location location { get; set; }
public string mission { get; set; }
public string phone { get; set; }
public int talking_about_count { get; set; }
public string username { get; set; }
public int were_here_count { get; set; }
public string id { get; set; }
public string name { get; set; }
public string link { get; set; }
public int likes { get; set; }
public Cover cover { get; set; }
}

在你的xmal中你有

  <TextBlock Name="usernamebox" Text="{Binding username}"></TextBlock>

现在将json对象值分配给textblock，你可以

this.usernamebox.DataContext = root1.username;

如何将字符串解码为JSON

1 个答案: