Use ContractResolver instead of forcing to lower case (#112)

Addresses #90

src/Microsoft.AspNetCore.JsonPatch/JsonPatchDocumentOfT.cs

@@ -691,12 +691,13 @@ namespace Microsoft.AspNetCore.JsonPatch
             {
                 foreach (var op in Operations)
                 {
-                    var untypedOp = new Operation();
+                    var untypedOp = new Operation
-
+                    {
-                    untypedOp.op = op.op;
+                        op = op.op,
-                    untypedOp.value = op.value;
+                        value = op.value,
-                    untypedOp.path = op.path;
+                        path = op.path,
-                    untypedOp.from = op.from;
+                        from = op.from
+                    };
 
                     allOps.Add(untypedOp);
                 }
@@ -715,11 +716,11 @@ namespace Microsoft.AspNetCore.JsonPatch
                 path += "/" + position;
                 if (segments.Count == 0)
                 {
-                    return path.ToLowerInvariant();
+                    return path;
                 }
             }
 
-            return "/" + path.ToLowerInvariant();
+            return "/" + path;
         }
 
         private List<string> GetPathSegments(Expression expr)

test/Microsoft.AspNetCore.JsonPatch.Test/JsonPatchDocumentGetPathTest.cs

@@ -19,7 +19,7 @@ namespace Microsoft.AspNetCore.JsonPatch
             var path = patchDocument.GetPath(p => p.SimpleObject.IntegerList, "-");
 
             // Assert
-            Assert.Equal("/simpleobject/integerlist/-", path);
+            Assert.Equal("/SimpleObject/IntegerList/-", path);
         }
 
         [Fact]
@@ -84,7 +84,7 @@ namespace Microsoft.AspNetCore.JsonPatch
             var path = patchDocument.GetPath(p => (BaseClass)p.DerivedObject, null);
 
             // Assert
-            Assert.Equal("/derivedobject", path);
+            Assert.Equal("/DerivedObject", path);
         }
 
         [Fact]

test/Microsoft.AspNetCore.JsonPatch.Test/JsonPatchDocumentJsonPropertyAttributeTest.cs

@@ -56,7 +56,7 @@ namespace Microsoft.AspNetCore.JsonPatch
 
             // get path
             var pathToCheck = deserialized.Operations.First().path;
-            Assert.Equal("/anothername", pathToCheck);
+            Assert.Equal("/AnotherName", pathToCheck);
         }
 
         [Fact]
@@ -73,7 +73,7 @@ namespace Microsoft.AspNetCore.JsonPatch
 
             // Assert
             var pathToCheck = deserialized.Operations.First().path;
-            Assert.Equal("/stringproperty", pathToCheck);
+            Assert.Equal("/StringProperty", pathToCheck);
         }
 
         [Fact]
@@ -90,7 +90,7 @@ namespace Microsoft.AspNetCore.JsonPatch
 
             // Assert
             var pathToCheck = deserialized.Operations.First().path;
-            Assert.Equal("/arrayproperty/-", pathToCheck);
+            Assert.Equal("/ArrayProperty/-", pathToCheck);
         }
 
         [Fact]
@@ -209,7 +209,7 @@ namespace Microsoft.AspNetCore.JsonPatch
 
             // get path
             var pathToCheck = deserialized.Operations.First().path;
-            Assert.Equal("/anothername", pathToCheck);
+            Assert.Equal("/AnotherName", pathToCheck);
         }
 
         [Fact]
@@ -249,9 +249,9 @@ namespace Microsoft.AspNetCore.JsonPatch
 
             // Assert
             var fromPath = deserialized.Operations.First().from;
-            Assert.Equal("/stringproperty", fromPath);
+            Assert.Equal("/StringProperty", fromPath);
             var toPath = deserialized.Operations.First().path;
-            Assert.Equal("/stringproperty2", toPath);
+            Assert.Equal("/StringProperty2", toPath);
         }
 
         [Fact]
@@ -269,7 +269,7 @@ namespace Microsoft.AspNetCore.JsonPatch
 
             // Assert
             var path = deserialized.Operations.First().path;
-            Assert.Equal("/socialsecuritynumber", path);
+            Assert.Equal("/SocialSecurityNumber", path);
         }
 
         private class JsonPropertyWithNoPropertyName