DxSparkline.ExportToAsync(String, DataExportFormat) Method

Exports sparkline data to a file in the specified format.

Namespace: DevExpress.Blazor

Assembly: DevExpress.Blazor.v25.1.dll

NuGet Package: DevExpress.Blazor

Declaration

public ValueTask ExportToAsync(
    string fileName,
    DataExportFormat format = DataExportFormat.Png
)

Parameters

Name	Type	Description
fileName	String	The name of the exported file.

Optional Parameters

Name	Type	Default	Description
format	DataExportFormat	Png	The format of the exported file.

Returns

Type	Description
ValueTask	A structure that stores an awaitable result of an asynchronous operation.

Remarks

Call the ExportToAsync() method to export sparkline data to a file in the specified format: PNG, PDF, JPEG, or SVG.

The following code snippet displays a custom Export to PDF button that exports component data to a PDF file. The button appears after the Sparkline is completely loaded. For demo purposes, the example imitates a time-consuming operation.

Razor

<DxSparkline Data="@DataSource"
             @ref=@Sparkline
             ArgumentFieldName="Month"
             ValueFieldName="VisitorCount"
             Rendered="@SparklineRendered"
             Height="50px"
             Width="200px">
</DxSparkline>

<DxButton Text="Export to PDF" Visible="@buttonVisible" Click="ExportToPdf" />

@code {
    bool buttonVisible;
    DxSparkline Sparkline;

    IEnumerable<SparklineDataPoint> DataSource = Enumerable.Empty<SparklineDataPoint>();
    protected override void OnInitialized() {
        DataSource = GenerateData();
    }

    async Task SparklineRendered() {
        await Task.Delay(2000);
        buttonVisible = true;
    }
    async Task ExportToPdf () {
        await Sparkline.ExportToAsync("Custom file", DataExportFormat.Pdf);
    }
}

DataSource

public List<SparklineDataPoint> GenerateData() {
    return new List<SparklineDataPoint>() {
            new SparklineDataPoint( 01, 2132),
            new SparklineDataPoint( 02, 2103),
            new SparklineDataPoint( 03, 2210),
            new SparklineDataPoint( 04, 2152),
            new SparklineDataPoint( 05, 2062),
            new SparklineDataPoint( 06, 1954),
            new SparklineDataPoint( 07, 2112),
            new SparklineDataPoint( 08, 1967),
            new SparklineDataPoint( 09, 2009),
            new SparklineDataPoint( 10, 2087),
            new SparklineDataPoint( 11, 2112),
            new SparklineDataPoint( 12, 2038),
        };
}
public class SparklineDataPoint {
    public int Month { get; set; }
    public int? VisitorCount { get; set; }
    public SparklineDataPoint(int month, int? visitorCount) {
        Month = month;
        VisitorCount = visitorCount;
    }
}