Fully qualify extension method calls

tests/EntityFrameworkCore.Projectables.Generator.Tests/ProjectionExpressionGeneratorTests.ProjectableExtensionMethod4.verified.txt

@@ -13,7 +13,7 @@ namespace EntityFrameworkCore.Projectables.Generated
         public static System.Linq.Expressions.Expression<System.Func<object, object>> Expression()
         {
             return (object i) => 
-                i.Foo1();
+                global::Foo.C.Foo1(i);
         }
     }
 }

tests/EntityFrameworkCore.Projectables.Generator.Tests/ProjectionExpressionGeneratorTests.ProjectablePropertyToNavigationalProperty.verified.txt

@@ -13,7 +13,7 @@ namespace EntityFrameworkCore.Projectables.Generated
         public static System.Linq.Expressions.Expression<System.Func<global::Foo.C, global::Foo.D>> Expression()
         {
             return (global::Foo.C @this) => 
-                @this.Dees.First();
+                global::System.Linq.Enumerable.First(@this.Dees);
         }
     }
 }

tests/EntityFrameworkCore.Projectables.Generator.Tests/ProjectionExpressionGeneratorTests.RequiredNamespace.verified.txt

@@ -0,0 +1,17 @@
+// <auto-generated/>
+using EntityFrameworkCore.Projectables;
+using One.Two;
+
+namespace EntityFrameworkCore.Projectables.Generated
+#nullable disable
+{
+    [System.ComponentModel.EditorBrowsable(System.ComponentModel.EditorBrowsableState.Never)]
+    public static class One_Two_Bar_Method
+    {
+        public static System.Linq.Expressions.Expression<System.Func<global::One.Two.Bar, int>> Expression()
+        {
+            return (global::One.Two.Bar @this) => 
+                global::One.IntExtensions.AddOne(1);
+        }
+    }
+}

tests/EntityFrameworkCore.Projectables.Generator.Tests/ProjectionExpressionGeneratorTests.TypesInBodyGetsFullyQualified.verified.txt

@@ -13,7 +13,7 @@ namespace EntityFrameworkCore.Projectables.Generated
         public static System.Linq.Expressions.Expression<System.Func<global::Foo.C, int>> Expression()
         {
             return (global::Foo.C @this) => 
-                @this.Dees.OfType<global::Foo.D>().Count();
+                global::System.Linq.Enumerable.Count(global::System.Linq.Enumerable.OfType<D>(@this.Dees));
         }
     }
 }

tests/EntityFrameworkCore.Projectables.Generator.Tests/ProjectionExpressionGeneratorTests.cs

@@ -1514,6 +1514,34 @@ class Foo {
             return Verifier.Verify(result.GeneratedTrees[0].ToString());
         }
 
+        [Fact]
+        public Task RequiredNamespace()
+        {
+            var compilation = CreateCompilation(@"
+using EntityFrameworkCore.Projectables;
+
+namespace One {
+    static class IntExtensions {
+        public static int AddOne(this int i) => i + 1;    
+    }
+}
+
+namespace One.Two {
+    class Bar {
+        [Projectable]
+        public int Method() => 1.AddOne();
+    }   
+}
+");
+
+            var result = RunGenerator(compilation);
+
+            Assert.Empty(result.Diagnostics);
+            Assert.Single(result.GeneratedTrees);
+
+            return Verifier.Verify(result.GeneratedTrees[0].ToString());
+        }
+
         #region Helpers
 
         Compilation CreateCompilation(string source, bool expectedToCompile = true)