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MAUI-978225 - [Others] Updated README file
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‎README.md‎

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# How-to-Serialize-template-column-content-in-.NET-MAUI-DataGrid--SfDataGrid-
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This demo shows how to Serialize template column content in .NET MAUI DataGrid (SfDataGrid)?
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This sample shows how to serialize and deserialize template column content in the .NET MAUI DataGrid (SfDataGrid).
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The example demonstrates placing a `DataGridTemplateColumn` with a `CellTemplate` (defined in XAML resources), wiring a custom `DataGridSerializationController` to preserve template column configuration, and using simple Serialize/Deserialize buttons to write/read the grid state to an XML file in app data.
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**Refer to the official UG for more details:**
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- [Getting Started with .NET MAUI DataGrid](https://help.syncfusion.com/maui/datagrid/getting-started)
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- [Serialization and Deserialization in .NET MAUI DataGrid (SfDataGrid)](https://help.syncfusion.com/maui/datagrid/serialization)
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## XAML
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The grid includes a `DataGridTemplateColumn` whose `CellTemplate` is stored in page resources with x:Key="cellTemplate".
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```xml
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<ContentPage.BindingContext>
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<local:EmployeeViewModel x:Name="viewModel" />
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</ContentPage.BindingContext>
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<ContentPage.Resources>
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<ResourceDictionary>
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<DataTemplate x:Key="cellTemplate">
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<Button Text="Test" />
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</DataTemplate>
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</ResourceDictionary>
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</ContentPage.Resources>
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<Grid ColumnDefinitions="*,300"
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RowDefinitions="Auto,Auto">
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<syncfusion:SfDataGrid x:Name="dataGrid"
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Grid.Column="0"
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Grid.Row="0"
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AllowGroupExpandCollapse="True"
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ColumnWidthMode="Auto"
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GridLinesVisibility="Both"
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HeaderGridLinesVisibility="Both"
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AutoGenerateColumnsMode="None"
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ItemsSource="{Binding Employees}">
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<syncfusion:SfDataGrid.Columns>
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<syncfusion:DataGridNumericColumn MappingName="EmployeeID"
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HeaderText="Employee ID" />
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<syncfusion:DataGridTextColumn MappingName="Title"
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HeaderText="Designation" />
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<syncfusion:DataGridDateColumn MappingName="HireDate"
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HeaderText="Hire Date" />
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<syncfusion:DataGridTemplateColumn MappingName="Name"
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HeaderText="Employee Name"
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CellTemplate="{StaticResource cellTemplate}" />
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</syncfusion:SfDataGrid.Columns>
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</syncfusion:SfDataGrid>
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<syncfusion:SfDataGrid x:Name="dataGrid1"
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Grid.Column="0"
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Grid.Row="1"
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ItemsSource="{Binding Employees}">
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</syncfusion:SfDataGrid>
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<VerticalStackLayout Grid.Column="1">
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<Grid RowDefinitions="80,80">
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<Button Text="Serialize"
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Grid.Row="0"
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Margin="0,0,0,20"
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WidthRequest="150"
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Clicked="Button_Clicked" />
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<Button Text="Deserialize"
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Grid.Row="1"
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Margin="0,20,0,0"
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WidthRequest="150"
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Clicked="Button_Clicked_1" />
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</Grid>
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</VerticalStackLayout>
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</Grid>
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```
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## C#
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To support serialization and restore the `CellTemplate` after deserialization, the sample adds a small extension of `DataGridSerializationController` that looks up the template in the page `ResourceDictionary` and reassigns it when restoring column properties.
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```csharp
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public MainPage()
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{
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InitializeComponent();
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this.dataGrid.SerializationController = new SerializationControllerExt(this.dataGrid, Resources);
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this.dataGrid1.SerializationController = new SerializationControllerExt(this.dataGrid1, Resources);
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}
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private void Button_Clicked(object sender, EventArgs e)
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{
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string localPath = Path.Combine(FileSystem.AppDataDirectory, "DataGrid.xml");
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using (var file = File.Create(localPath))
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{
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dataGrid.Serialize(file);
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}
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}
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private void Button_Clicked_1(object sender, EventArgs e)
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{
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string localPath = Path.Combine(FileSystem.AppDataDirectory, "DataGrid.xml");
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using (var file = File.Open(localPath, FileMode.Open))
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{
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dataGrid1.Deserialize(file);
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}
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}
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public class SerializationControllerExt : DataGridSerializationController
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{
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private readonly ResourceDictionary _pageResources;
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public SerializationControllerExt(SfDataGrid grid, ResourceDictionary pageResources)
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: base(grid)
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{
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_pageResources = pageResources;
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}
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protected override void RestoreColumnProperties(SerializableDataGridColumn serializableColumn, DataGridColumn column)
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{
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base.RestoreColumnProperties(serializableColumn, column);
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if (column is DataGridTemplateColumn templateColumn &&
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string.Equals(templateColumn.MappingName, "Name", StringComparison.Ordinal))
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{
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if (_pageResources.TryGetValue("cellTemplate", out var template) &&
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template is DataTemplate dataTemplate)
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{
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templateColumn.CellTemplate = dataTemplate;
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}
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}
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}
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}
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```
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## How it works
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- The grid's `SerializationController` is set to `SerializationControllerExt` which inherits from `DataGridSerializationController`.
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- When the grid is serialized, column definitions including type and properties are written to the stream (here, an XML file in `FileSystem.AppDataDirectory`).
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- On deserialization the base controller restores basic column properties; `SerializationControllerExt.RestoreColumnProperties` runs afterward to reconnect runtime-only artifacts such as `DataTemplate` instances that live in the page `ResourceDictionary`.
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##### Conclusion
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I hope you enjoyed learning about how to Serialize template column content in .NET MAUI DataGrid (SfDataGrid).
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You can refer to our [.NET MAUI DataGrid’s feature tour](https://www.syncfusion.com/maui-controls/maui-datagrid) page to learn about its other groundbreaking feature representations. You can also explore our [.NET MAUI DataGrid Documentation](https://help.syncfusion.com/maui/datagrid/getting-started) to understand how to present and manipulate data.
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For current customers, you can check out our .NET MAUI components on the [License and Downloads](https://www.syncfusion.com/sales/teamlicense) page. If you are new to Syncfusion, you can try our 30-day [free trial](https://www.syncfusion.com/downloads/maui) to explore our .NET MAUI DataGrid and other .NET MAUI components.
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If you have any queries or require clarifications, please let us know in the comments below. You can also contact us through our [support forums](https://www.syncfusion.com/forums), [Direct-Trac](https://support.syncfusion.com/create) or [feedback portal](https://www.syncfusion.com/feedback/maui?control=sfdatagrid), or the feedback portal. We are always happy to assist you!

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