Make the PropertyFetcher case insensitive (#49)

Author: markvincze

src/OpenTracing.Contrib.NetCore/Internal/PropertyFetcher.cs

@@ -1,6 +1,7 @@
 // From https://github.com/dotnet/corefx/blob/master/src/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/DiagnosticSourceEventSource.cs
 
 using System;
+using System.Linq;
 using System.Reflection;
 
 namespace OpenTracing.Contrib.NetCore.Internal
@@ -28,7 +29,8 @@ public object Fetch(object obj)
             if (objType != _expectedType)
             {
                 TypeInfo typeInfo = objType.GetTypeInfo();
-                _fetchForExpectedType = PropertyFetch.FetcherForProperty(typeInfo.GetDeclaredProperty(_propertyName));
+                var propertyInfo = typeInfo.DeclaredProperties.FirstOrDefault(p => string.Equals(p.Name, _propertyName, StringComparison.InvariantCultureIgnoreCase));
+                _fetchForExpectedType = PropertyFetch.FetcherForProperty(propertyInfo);
                 _expectedType = objType;
             }
             return _fetchForExpectedType.Fetch(obj);

test/OpenTracing.Contrib.NetCore.Tests/Internal/PropertyFetcherTest.cs

@@ -0,0 +1,52 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using OpenTracing.Contrib.NetCore.Internal;
+using Xunit;
+
+namespace OpenTracing.Contrib.NetCore.Tests.Internal
+{
+    public class PropertyFetcherTest
+    {
+        public class TestClass
+        {
+            public string TestProperty { get; set; }
+        }
+
+        [Fact]
+        public void Fetch_NameNotFound_NullReturned()
+        {
+            var obj = new TestClass { TestProperty = "TestValue" };
+
+            var sut = new PropertyFetcher("DifferentProperty");
+
+            var result = sut.Fetch(obj);
+
+            Assert.Null(result);
+        }
+
+        [Fact]
+        public void Fetch_NameFound_ValueReturned()
+        {
+            var obj = new TestClass { TestProperty = "TestValue" };
+
+            var sut = new PropertyFetcher("TestProperty");
+
+            var result = sut.Fetch(obj);
+
+            Assert.Equal("TestValue", result);
+        }
+
+        [Fact]
+        public void Fetch_NameFoundDifferentCasing_ValueReturned()
+        {
+            var obj = new TestClass { TestProperty = "TestValue" };
+
+            var sut = new PropertyFetcher("testproperty");
+
+            var result = sut.Fetch(obj);
+
+            Assert.Equal("TestValue", result);
+        }
+    }
+}