Unable to bind Dictionary with key type "Enum" when key string case is different (#71926)

Use ignoreCase=true when parsing enum values.

Fix #71185

src/libraries/Microsoft.Extensions.Configuration.Binder/src/ConfigurationBinder.cs

@@ -576,9 +576,10 @@ private static bool CanBindToTheseConstructorParameters(ParameterInfo[] construc
             {
                 try
                 {
-                    object key = keyTypeIsEnum ? Enum.Parse(keyType, child.Key) :
+                    object key = keyTypeIsEnum ? Enum.Parse(keyType, child.Key, true) :
                         keyTypeIsInteger ? Convert.ChangeType(child.Key, keyType) :
                         child.Key;
+
                     var valueBindingPoint = new BindingPoint(
                         initialValueProvider: () =>
                         {

src/libraries/Microsoft.Extensions.Configuration.Binder/tests/ConfigurationBinderTests.cs

@@ -491,6 +491,33 @@ public class ByteArrayOptions
             public byte[] MyByteArray { get; set; }
         }
 
+        public enum TestSettingsEnum
+        {
+            Option1,
+            Option2,
+        }
+
+        [Fact]
+        public void EnumBindCaseInsensitiveNotThrows()
+        {
+            var dic = new Dictionary<string, string>
+            {
+                {"Section:Option1", "opt1"},
+                {"Section:option2", "opt2"}
+            };
+
+            var configurationBuilder = new ConfigurationBuilder();
+            configurationBuilder.AddInMemoryCollection(dic);
+            var config = configurationBuilder.Build();
+            var configSection = config.GetSection("Section");
+
+            var configOptions = new Dictionary<TestSettingsEnum, string>();
+            configSection.Bind(configOptions);
+
+            Assert.Equal("opt1", configOptions[TestSettingsEnum.Option1]);
+            Assert.Equal("opt2", configOptions[TestSettingsEnum.Option2]);
+        }
+
         [Fact]
         public void CanBindIConfigurationSection()
         {