diff options
| -rw-r--r-- | Xamarin.Forms.Core.UnitTests/ResourceDictionaryTests.cs | 14 | ||||
| -rw-r--r-- | Xamarin.Forms.Core/ResourceDictionary.cs | 2 |
2 files changed, 16 insertions, 0 deletions
diff --git a/Xamarin.Forms.Core.UnitTests/ResourceDictionaryTests.cs b/Xamarin.Forms.Core.UnitTests/ResourceDictionaryTests.cs index e5b8b60d..9a2c6f01 100644 --- a/Xamarin.Forms.Core.UnitTests/ResourceDictionaryTests.cs +++ b/Xamarin.Forms.Core.UnitTests/ResourceDictionaryTests.cs @@ -292,5 +292,19 @@ namespace Xamarin.Forms.Core.UnitTests Assert.True(rd0.TryGetMergedValue("foo", out _)); Assert.AreEqual("Foo", _); } + + [Test] + public void ThrowOnDuplicateKey() + { + var rd0 = new ResourceDictionary(); + rd0.Add("foo", "Foo"); + try { + rd0.Add("foo", "Bar"); + } catch (ArgumentException ae) { + Assert.AreEqual("A resource with the key 'foo' is already present in the ResourceDictionary.", ae.Message); + Assert.Pass(); + } + Assert.Fail(); + } } }
\ No newline at end of file diff --git a/Xamarin.Forms.Core/ResourceDictionary.cs b/Xamarin.Forms.Core/ResourceDictionary.cs index ed3ea7f5..a213dee5 100644 --- a/Xamarin.Forms.Core/ResourceDictionary.cs +++ b/Xamarin.Forms.Core/ResourceDictionary.cs @@ -72,6 +72,8 @@ namespace Xamarin.Forms public void Add(string key, object value) { + if (ContainsKey(key)) + throw new ArgumentException($"A resource with the key '{key}' is already present in the ResourceDictionary."); _innerDictionary.Add(key, value); OnValueChanged(key, value); } |