ChartControl.LoadFromFile(String) Method

Loads the chart layout from the specified file.

Namespace: DevExpress.Xpf.Charts

Assembly: DevExpress.Xpf.Charts.v19.1.dll

Declaration

C#

public void LoadFromFile(
    string fileName
)

VB.NET

Public Sub LoadFromFile(
    fileName As String
)

Parameters

Name	Type	Description
fileName	String	The path to the file containing the chart to be loaded. An exception is raised if the specified file doesn’t exist.

Remarks

Use the LoadFromFile method to load a chart layout from a file that the ChartControl.SaveToFile method creates.

Example

The following code utilizes the save/load methods, and allows an end user to write to or read from a layout file:

Tip

The complete example is available on GitHub.

C#

// In the Window's code-behind file.
const string LayoutSavedFormatString = "The Chart Layout saved to the '{0}' file";
const string LayoutLoadedFormatString = "The Chart Layout loaded from the '{0}' file";

private void OnSaveBarItemClick(object sender, ItemClickEventArgs e) {
    DXSaveFileDialog dialog = new DXSaveFileDialog();
    dialog.DefaultExt = "xml";
    bool? result = dialog.ShowDialog();
    if (result.HasValue && result.Value) {
        chartControl.SaveToFile(dialog.FileName);
        statusMessageItem.Content = String.Format(LayoutSavedFormatString, dialog.FileName);
    }
}

private void OnLoadBarItemClick(object sender, ItemClickEventArgs e) {
    DXOpenFileDialog dialog = new DXOpenFileDialog();
    dialog.DefaultExt = "xml";
    bool? result = dialog.ShowDialog();
    if (result.HasValue && result.Value) {
        chartControl.LoadFromFile(dialog.FileName);
        // IMPORTANT: LoadFrom... methods create new instances of chart elements to restore the Chart Control's layout.
        // You should recreate bindings if you bind UI controls to chart elements.
        CreateBindings();
        statusMessageItem.Content = String.Format(LayoutLoadedFormatString, dialog.FileName);
    }
}

VB

' In the Window's code-behind file.
Const LayoutSavedFormatString As String = "The Chart Layout saved to the '{0}' file"
Const LayoutLoadedFormatString As String = "The Chart Layout loaded from the '{0}' file"

Private Sub OnSaveBarItemClick(sender As Object, e As ItemClickEventArgs)
    Dim dialog As DXSaveFileDialog = New DXSaveFileDialog()
    dialog.DefaultExt = "xml"
    Dim result As Boolean? = dialog.ShowDialog()
    If (result.HasValue And result.Value) Then
        chartControl.SaveToFile(dialog.FileName)
        statusMessageItem.Content = String.Format(LayoutSavedFormatString, dialog.FileName)
    End If
End Sub

Private Sub OnLoadBarItemClick(sender As Object, e As ItemClickEventArgs)
    Dim dialog As DXOpenFileDialog = New DXOpenFileDialog()
    dialog.DefaultExt = "xml"
    Dim result As Boolean? = dialog.ShowDialog()
    If (result.HasValue And result.Value) Then
        chartControl.LoadFromFile(dialog.FileName)
        ' IMPORTANT: LoadFrom... methods create new instances of chart elements to restore the Chart Control's layout.
        ' You should recreate bindings when you bind UI controls to chart elements.
        CreateBindings()
        statusMessageItem.Content = String.Format(LayoutLoadedFormatString, dialog.FileName)
    End If
End Sub

The Chart Control provides the following methods that save/load its layout:

Method	Description
SaveToFile(String)	Saves the chart layout to the specified file.
SaveToStream(Stream)	Saves the chart layout to the specified stream.
LoadFromFile(String)	Loads the chart layout from the specified file.
LoadFromStream(Stream)	Loads the chart layout from the specified stream.

Related GitHub Examples

The following code snippet (auto-collected from DevExpress Examples) contains a reference to the LoadFromFile(String) method.

Note

The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.

VB.NET

how-to-save-and-restore-chart-layout/VB/SaveLayoutSample/MainWindow.xaml.vb#L39

If result.HasValue AndAlso result.Value Then
    chartControl.LoadFromFile(dialog.FileName)
    CreateBindings()