Added TryGetValue method to get values without throwing exception (#9)

Author: vudodov

V.Udodov.Json.Tests/EntityTests.cs

@@ -138,7 +138,7 @@ public void WhenGettingEntityAsAStringItShouldSerializeIt()
         }
 
         [Fact]
-        public void WhenTryingToGetWrongFlexibleDataEntityItemItShouldThrow()
+        public void WhenTryingToGetWrongFlexibleDataEntityItemThroughIndexerItShouldThrow()
         {
             var entityMock = new EntityMock
             {
@@ -152,5 +152,33 @@ public void WhenTryingToGetWrongFlexibleDataEntityItemItShouldThrow()
 
             action.Should().Throw<KeyNotFoundException>();
         }
+        
+        [Fact]
+        public void WhenTryingToGetWrongFlexibleDataEntityItemItShouldThrow()
+        {
+            var entityMock = new EntityMock
+            {
+                ["shoe_size"] = 12
+            };
+
+            entityMock.TryGetValue("pants_size", out var result)
+                .Should().BeFalse();
+
+            result.Should().BeNull();
+        }
+        
+        [Fact]
+        public void WhenTryingToGetFlexibleDataEntityItemItShouldThrow()
+        {
+            var entityMock = new EntityMock
+            {
+                ["shoe_size"] = 12
+            };
+
+            entityMock.TryGetValue("shoe_size", out var result)
+                .Should().BeTrue();
+
+            result.Should().Be(12);
+        }
     }
 }

V.Udodov.Json/Entity.cs

@@ -84,24 +84,7 @@ public object this[string key]
 
         private object Get(string key)
         {
-            object JTokenToObject(JToken source)
-            {
-                switch (source.Type)
-                {
-                    case JTokenType.Object:
-                        return ((JObject) source).Properties()
-                            .ToDictionary(prop => prop.Name, prop => JTokenToObject(prop.Value));
-                    case JTokenType.Array:
-                        return source.Values().Select(JTokenToObject).ToList();
-                    default:
-                        return source.ToObject<object>();
-                }
-            }
-
-            if (_data.TryGetValue(key, out JToken token))
-            {
-                return JTokenToObject(token);
-            }
+            if (TryGetValue(key, out object result)) return result;
 
             throw new KeyNotFoundException($"Key {key} was not found.");
         }
@@ -123,5 +106,31 @@ private void Set(string key, object value)
 
             _data.Add(key, token);
         }
+
+        public bool TryGetValue(string key, out object value)
+        {
+            object JTokenToObject(JToken source)
+            {
+                switch (source.Type)
+                {
+                    case JTokenType.Object:
+                        return ((JObject) source).Properties()
+                            .ToDictionary(prop => prop.Name, prop => JTokenToObject(prop.Value));
+                    case JTokenType.Array:
+                        return source.Values().Select(JTokenToObject).ToList();
+                    default:
+                        return source.ToObject<object>();
+                }
+            }
+
+            if (_data.TryGetValue(key, out JToken token))
+            {
+                value = JTokenToObject(token);
+                return true;
+            }
+
+            value = null;
+            return false;
+        }
     }
 }