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DataTemplateExtension.cs
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DataTemplateExtension.cs
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using System;
namespace Microsoft.Maui.Controls.Xaml
{
[ContentProperty(nameof(TypeName))]
[ProvideCompiled("Microsoft.Maui.Controls.Build.Tasks.DataTemplateExtension")]
public sealed class DataTemplateExtension : IMarkupExtension<DataTemplate>
{
public string TypeName { get; set; }
public DataTemplate ProvideValue(IServiceProvider serviceProvider)
{
if (serviceProvider == null)
throw new ArgumentNullException(nameof(serviceProvider));
if (!(serviceProvider.GetService(typeof(IXamlTypeResolver)) is IXamlTypeResolver typeResolver))
throw new ArgumentException("No IXamlTypeResolver in IServiceProvider");
if (string.IsNullOrEmpty(TypeName))
{
var li = (serviceProvider.GetService(typeof(IXmlLineInfoProvider)) is IXmlLineInfoProvider lip) ? lip.XmlLineInfo : new XmlLineInfo();
throw new XamlParseException("TypeName isn't set.", li);
}
if (typeResolver.TryResolve(TypeName, out var type))
return new DataTemplate(type);
var lineInfo = (serviceProvider.GetService(typeof(IXmlLineInfoProvider)) is IXmlLineInfoProvider lineInfoProvider) ? lineInfoProvider.XmlLineInfo : new XmlLineInfo();
throw new XamlParseException($"DataTemplateExtension: Could not locate type for {TypeName}.", lineInfo);
}
object IMarkupExtension.ProvideValue(IServiceProvider serviceProvider)
{
return (this as IMarkupExtension<DataTemplate>).ProvideValue(serviceProvider);
}
}
}