Improved expression tree generation

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

@@ -8,7 +8,7 @@ namespace EntityFrameworkCore.Projectables.Generated
 {
     public static class Foo_C_Foo
     {
-        public static System.Linq.Expressions.Expression<System.Func<global::Foo.C, D>> Expression => 
+        public static System.Linq.Expressions.Expression<System.Func<global::Foo.C, global::Foo.D>> Expression => 
             (global::Foo.C @this) => @this.Dees.First();
     }
 }

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

@@ -0,0 +1,14 @@
+using System;
+using System.Linq;
+using EntityFrameworkCore.Projectables;
+using Foo;
+
+namespace EntityFrameworkCore.Projectables.Generated
+#nullable disable
+{
+    public static class Foo_C_Foo
+    {
+        public static System.Linq.Expressions.Expression<System.Func<global::Foo.C, int>> Expression => 
+            (global::Foo.C @this) => @this.Dees.OfType<global::Foo.D>().Count();
+    }
+}

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

@@ -292,6 +292,33 @@ namespace Foo {
             return Verifier.Verify(result.GeneratedTrees[0].ToString());
         }
 
+        [Fact]
+        public Task TypesInBodyGetsFullyQualified()
+        {
+            var compilation = CreateCompilation(@"
+using System;
+using System.Linq;
+using EntityFrameworkCore.Projectables;
+namespace Foo {
+    class D { }
+    
+    class C {
+        public System.Collections.Generic.List<D> Dees { get; set; }
+
+        [Projectable]
+        public int Foo => Dees.OfType<D>().Count();
+    }
+}
+");
+
+            var result = RunGenerator(compilation);
+
+            Assert.Empty(result.Diagnostics);
+            Assert.Single(result.GeneratedTrees);
+
+            return Verifier.Verify(result.GeneratedTrees[0].ToString());
+        }
+
         [Fact]
         public Task ProjectableExtensionMethod()
         {