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Fix date typos and terminology in default interface methods tutorial #47375

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Copilot Jul 15, 2025
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Fix date typos and terminology in default interface methods tutorial
Copilot Jul 15, 2025
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2 changes: 1 addition & 1 deletion .../advanced-topics/interface-implementation/default-interface-methods-versions.md
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Original file line number Diff line number Diff line change
Expand Up @@ -55,7 +55,7 @@ Notice the following portion of the test:

:::code language="csharp" source="./snippets/default-interface-members-versions/finished/customer-relationship/Program.cs" id="SnippetHighlightCast":::

That cast from `SampleCustomer` to `ICustomer` is necessary. The `SampleCustomer` class doesn't need to provide an implementation for `ComputeLoyaltyDiscount`; that's provided by the `ICustomer` interface. However, the `SampleCustomer` class doesn't inherit members from its interfaces. That rule hasn't changed. In order to call any method declared and implemented in the interface, the variable must be the type of the interface, `ICustomer` in this example.
That implicit conversion from `SampleCustomer` to `ICustomer` is necessary. The `SampleCustomer` class doesn't need to provide an implementation for `ComputeLoyaltyDiscount`; that's provided by the `ICustomer` interface. However, the `SampleCustomer` class doesn't inherit members from its interfaces. That rule hasn't changed. In order to call any method declared and implemented in the interface, the variable must be the type of the interface, `ICustomer` in this example.

## Provide parameterization

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4 changes: 2 additions & 2 deletions ...ion/snippets/default-interface-members-versions/finished/customer-relationship/Program.cs
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Expand Up @@ -5,14 +5,14 @@
Reminders =
{
{ new DateTime(2010, 08, 12), "childs's birthday" },
{ new DateTime(1012, 11, 15), "anniversary" }
{ new DateTime(2012, 11, 15), "anniversary" }
}
};

SampleOrder o = new SampleOrder(new DateTime(2012, 6, 1), 5m);
c.AddOrder(o);

o = new SampleOrder(new DateTime(2103, 7, 4), 25m);
o = new SampleOrder(new DateTime(2013, 7, 4), 25m);
c.AddOrder(o);

// <SnippetHighlightCast>
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4 changes: 2 additions & 2 deletions ...tion/snippets/default-interface-members-versions/starter/customer-relationship/Program.cs
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Expand Up @@ -5,14 +5,14 @@
Reminders =
{
{ new DateTime(2010, 08, 12), "childs's birthday" },
{ new DateTime(1012, 11, 15), "anniversary" }
{ new DateTime(2012, 11, 15), "anniversary" }
}
};

SampleOrder o = new SampleOrder(new DateTime(2012, 6, 1), 5m);
c.AddOrder(o);

o = new SampleOrder(new DateTime(2103, 7, 4), 25m);
o = new SampleOrder(new DateTime(2013, 7, 4), 25m);
c.AddOrder(o);

Console.WriteLine($"Data about {c.Name}");
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