Question

我有来自mysql数据库的数据，并在listview中显示了它。现在，我想将列表视图中的内容导出为pdf文件或可读文件。

我一直在搜索，它指示我趋向于融合，但是没有足够的教程。也许我需要添加一些细节才能完成此事件。

这是我绑定的来源。

public class Post
{
    //private const string V = "test";
    //from settingspage to show up in history
    string rain1lbl = Settings.rain1LocationSettings;
    string rain2lbl = Settings.rain2LocationSettings;
    string rain3lbl = Settings.rain3LocationSettings;

    //ID primary key that we will autoincrement
    //These are binding source for Historypage
    [PrimaryKey, AutoIncrement]
    public int ID { get; set; }

    public static bool showLabel { get; set; }  //public class model


    public string rain1Lbl
    {
        get => rain1lbl;

        set
        {
            rain1lbl = Settings.rain1LocationSettings;
        }
    }

    public string rain2Lbl
    {
        get => rain2lbl;

        set
        {
            rain2lbl = Settings.rain2LocationSettings;
        }
    }

    public string rain3Lbl
    {
        get => rain3lbl;

        set
        {
            rain3lbl = Settings.rain3LocationSettings;
        }
    }


    public string CDateTime { get; set; }

    [MaxLength(3)]
    public string rain1vol { get; set; }

    [MaxLength(3)]
    public string rain2vol { get; set; }

    [MaxLength(3)]
    public string rain3vol { get; set; }

    }

}

xaml文件

<ListView x:Name="postListView" SeparatorVisibility="Default" HasUnevenRows="true"
       ItemsSource="{Binding Items}" SeparatorColor="White" ItemSelected="listviewhandle_ItemSelected" >

<ListView.ItemTemplate>

         <!-- from the post.cs -->
    <DataTemplate>
        <ViewCell >
            <Grid BackgroundColor="Black" HorizontalOptions="CenterAndExpand"  VerticalOptions="FillAndExpand"
                  Padding="1,2,1,0">

            <Grid HorizontalOptions="CenterAndExpand" VerticalOptions="FillAndExpand" ColumnSpacing="1"
                  RowSpacing="1">
                <Grid.RowDefinitions > 
                <RowDefinition Height="Auto" />
                <RowDefinition Height="Auto" />
                <RowDefinition Height="Auto" />
                <RowDefinition Height="Auto" />
                </Grid.RowDefinitions>

            <Grid.ColumnDefinitions>                      
            <ColumnDefinition Width="120"/>
            <ColumnDefinition Width="100"/>                 
            </Grid.ColumnDefinitions>  

                <!-- Date Time binding from Post.cs MVVM-->
               <Label x:Name="datetimeLabel" Grid.Row="0" HorizontalTextAlignment="Center" Text="{Binding CDateTime}" BackgroundColor="Yellow" Grid.ColumnSpan="2" />

            <!-- rain1 Row 1 odd rows are conrflowerblue-->
            <Label Grid.Row="1" FontSize="Medium" Grid.Column="0" Text="{Binding rain1Lbl}" HorizontalTextAlignment="Center" BackgroundColor="cornflowerblue"  />               
            <Label Grid.Row="1" Grid.Column="1" Text="{Binding rain1vol}" HorizontalTextAlignment="Center" BackgroundColor="cornflowerblue" /> 
                            <!-- endrow1   -->  

                            <!-- rain2 Row 2 -->
            <Label Grid.Row="2"  FontSize="Medium" Grid.Column="0" IsVisible="{Binding showLabel}" Text="{Binding rain2Lbl}" HorizontalTextAlignment="Center" BackgroundColor="Yellow"/>               
            <Label Grid.Row="2" Grid.Column="1" Text="{Binding rain2vol}" HorizontalTextAlignment="Center" BackgroundColor="Yellow" /> 

                            <!-- endrow2   -->

                    <!-- rain3 Row 3 -->
            <Label Grid.Row="3" FontSize="Medium" Grid.Column="0" Text="{Binding rain3Lbl}" HorizontalTextAlignment="Center" BackgroundColor="cornflowerblue" />                         
            <Label Grid.Row="3" Grid.Column="1" Text="{Binding rain3vol}" HorizontalTextAlignment="Center" BackgroundColor="cornflowerblue"/>
                            <!-- endrow3   -->  

</Grid>

      </Grid>
        </ViewCell>
    </DataTemplate>       
</ListView.ItemTemplate>
</ListView>
       </StackLayout> 
</ContentPage>

cs文件公共局部类HistoryLogPage：ContentPage { 公共HistoryLogPage（） {

        InitializeComponent();
    }

    protected override void OnAppearing()
    {
        base.OnAppearing();
        SQLiteConnection conn = new SQLiteConnection(App.DatabaseLocation);
        {

            conn.CreateTable<Post>();
            var posts= conn.Table<Post>().ToList();
            postListView.ItemsSource = posts;
            conn.Close();

        }
    }

    //to be able to know which item was selected
    void listviewhandle_ItemSelected(object sender, SelectedItemChangedEventArgs e)
    {
        var selectedPost = postListView.SelectedItem as Post;

        if(selectedPost != null)
        {
            Navigation.PushModalAsync(new PostDetail(selectedPost));
        }
    }

    void converbuttonHandle_Clicked(object sender, EventArgs e)
    {


    }
}

Answer 1

根据您的描述，我找到了一种将数据从ListView导出到Excel文件的方法，您可以看一下：

https://github.com/egbakou/ExportDataToExcel

更新：

   // Constructing header
                    Row row = new Row();

                    row.Append(
                        ConstructCell("No", CellValues.String),
                        ConstructCell("FullName", CellValues.String),
                        ConstructCell("Phone", CellValues.String)
                        );

                    // Insert the header row to the Sheet Data
                    sheetData.AppendChild(row);

                    // Add each product
                    foreach (var d in Developers)
                    {
                        row = new Row();
                        row.Append(
                            ConstructCell(d.ID.ToString(), CellValues.String),
                            ConstructCell(d.FullName, CellValues.String),
                            ConstructCell(d.Phone, CellValues.String));
                        sheetData.AppendChild(row);
                    }

根据代码，您可以使用Row.Append（）在excel中打印标题，例如列1，列2，列3 ......

然后，您可以让每个ListView项源在Excel中插入数据。通过您的代码，我看到您的ListView Itemsource是Items，因此您可以让每个Items在excel中插入数据，如下所示：

 foreach (var d in Items)
        {
            row = new Row();
            row.Append(
                ConstructCell(d.CDateTime.ToString(), CellValues.String),
                ConstructCell(d.rain1Lbl.ToString(), CellValues.String),
                ConstructCell(d.rain1vol.ToString(), CellValues.String)
                 ConstructCell(d.showLabel.ToString(), CellValues.String),
                ConstructCell(d.rain2vol.ToString(), CellValues.String),
                 ConstructCell(d.rain3Lbl.ToString(), CellValues.String),
                ConstructCell(d.rain3vol.ToString(), CellValues.String));
            sheetData.AppendChild(row);
        }

请

如何将数据从listview（mysql离线数据库）导出为pdf或某种类型的可读文件？

1 个答案: