Add more C# examples to fusion docs

website/src/docs/fusion/v16/data-requirements-and-mapping.md

@@ -215,6 +215,20 @@ type Product {
 }
 ```
 
+**C# resolver**
+
+```csharp
+[ObjectType<Product>]
+public static partial class ProductNode
+{
+    public static decimal GetTaxEstimate(
+        [Parent] Product product,
+        [Require("seller.address.countryCode")] string countryCode,
+        [Require] float price)
+        => TaxCalculator.Estimate(countryCode, price);
+}
+```
+
 The gateway traverses `seller.address.countryCode` on the entity and passes the resolved value as the `countryCode` argument.
 
 ### List Aggregation Paths
@@ -235,6 +249,29 @@ type Product {
 
 The path `seller.addresses[countryCode]` means: navigate to `seller.addresses` (a list), then select `countryCode` from each element. If the seller has three addresses with country codes `"US"`, `"DE"`, and `"US"`, the resolver receives `["US", "DE", "US"]` as the `countryCodes` argument.
 
+**C# resolver**
+
+```csharp
+[ObjectType<Product>]
+public static partial class ProductNode
+{
+    public static decimal GetTaxEstimate(
+        [Parent] Product product,
+        [Require("seller.addresses[countryCode]")] string[] countryCodes,
+        [Require] float price)
+        => TaxCalculator.Estimate(countryCodes, price);
+}
+```
+
+For the list projection variant (`dimensions[{ weight, height }]`), the argument is a list of an input object type:
+
+```csharp
+public static int GetBulkEstimate(
+    [Parent] Product product,
+    [Require("dimensions[{ weight, height }]")] ProductDimensionInput[] dimensions)
+    => ShippingCalculator.Bulk(dimensions);
+```
+
 ## Declaring Contextually Available Fields
 
 Use `@provides` on a field that returns an entity to tell the gateway that certain subfields of that entity are available when resolved through this specific field. The subgraph does not own those fields globally, but it can provide them in this context.