diff --git a/src/ObservableCollections/ObservableDictionary.cs b/src/ObservableCollections/ObservableDictionary.cs
index 897ac7e..118fc87 100644
--- a/src/ObservableCollections/ObservableDictionary.cs
+++ b/src/ObservableCollections/ObservableDictionary.cs
@@ -3,6 +3,7 @@ using System;
 using System.Collections;
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
+using System.Linq;
 
 namespace ObservableCollections
 {
@@ -18,12 +19,27 @@ namespace ObservableCollections
             this.dictionary = new Dictionary<TKey, TValue>();
         }
 
-        public ObservableDictionary(IEnumerable<KeyValuePair<TKey, TValue>> collection)
+        public ObservableDictionary(IEqualityComparer<TKey>? comparer)
         {
-#if NET6_0_OR_GREATER
-            this.dictionary = new Dictionary<TKey, TValue>(collection);
+            this.dictionary = new Dictionary<TKey, TValue>(comparer: comparer);
+        }
+
+        public ObservableDictionary(int capacity, IEqualityComparer<TKey>? comparer)
+        {
+            this.dictionary = new Dictionary<TKey, TValue>(capacity, comparer: comparer);
+        }
+
+        public ObservableDictionary(IEnumerable<KeyValuePair<TKey, TValue>> collection)
+            : this(collection, null)
+        {
+        }
+
+        public ObservableDictionary(IEnumerable<KeyValuePair<TKey, TValue>> collection, IEqualityComparer<TKey>? comparer)
+        {
+#if NETSTANDARD2_1_OR_GREATER || NET6_0_OR_GREATER
+            this.dictionary = new Dictionary<TKey, TValue>(collection: collection, comparer: comparer);
 #else
-            this.dictionary = new Dictionary<TKey, TValue>();
+            this.dictionary = new Dictionary<TKey, TValue>(comparer: comparer);
             foreach (var item in collection)
             {
                 dictionary.Add(item.Key, item.Value);
@@ -224,5 +240,16 @@ namespace ObservableCollections
         {
             return GetEnumerator();
         }
+
+        public IEqualityComparer<TKey> Comparer
+        {
+            get
+            {
+                lock (SyncRoot)
+                {
+                    return dictionary.Comparer;
+                }
+            }
+        }
     }
 }
diff --git a/src/ObservableCollections/ObservableHashSet.cs b/src/ObservableCollections/ObservableHashSet.cs
index 8e2e1d4..0b95615 100644
--- a/src/ObservableCollections/ObservableHashSet.cs
+++ b/src/ObservableCollections/ObservableHashSet.cs
@@ -19,18 +19,33 @@ namespace ObservableCollections
             this.set = new HashSet<T>();
         }
 
+        public ObservableHashSet(IEqualityComparer<T>? comparer)
+        {
+            this.set = new HashSet<T>(comparer: comparer);
+        }
+
 #if NETSTANDARD2_1_OR_GREATER || NET5_0_OR_GREATER
 
         public ObservableHashSet(int capacity)
         {
-            this.set = new HashSet<T>(capacity);
+            this.set = new HashSet<T>(capacity: capacity);
+        }
+
+        public ObservableHashSet(int capacity, IEqualityComparer<T>? comparer)
+        {
+            this.set = new HashSet<T>(capacity: capacity, comparer: comparer);
         }
 
 #endif
 
         public ObservableHashSet(IEnumerable<T> collection)
         {
-            this.set = new HashSet<T>(collection);
+            this.set = new HashSet<T>(collection: collection);
+        }
+
+        public ObservableHashSet(IEnumerable<T> collection, IEqualityComparer<T>? comparer)
+        {
+            this.set = new HashSet<T>(collection: collection, comparer: comparer);
         }
 
         public event NotifyCollectionChangedEventHandler<T>? CollectionChanged;
@@ -185,7 +200,7 @@ namespace ObservableCollections
 
         public bool TryGetValue(T equalValue, [MaybeNullWhen(false)] out T actualValue)
         {
-            lock(SyncRoot)
+            lock (SyncRoot)
             {
                 return set.TryGetValue(equalValue, out actualValue);
             }
@@ -264,5 +279,16 @@ namespace ObservableCollections
         {
             return GetEnumerator();
         }
+
+        public IEqualityComparer<T> Comparer
+        {
+            get
+            {
+                lock (SyncRoot)
+                {
+                    return set.Comparer;
+                }
+            }
+        }
     }
 }
diff --git a/src/ObservableCollections/ObservableQueue.cs b/src/ObservableCollections/ObservableQueue.cs
index 2a66ca6..db18b5b 100644
--- a/src/ObservableCollections/ObservableQueue.cs
+++ b/src/ObservableCollections/ObservableQueue.cs
@@ -171,7 +171,7 @@ namespace ObservableCollections
             }
         }
 
-        public bool TryPeek([MaybeNullWhen(false)] T result)
+        public bool TryPeek([MaybeNullWhen(false)] out T result)
         {
             lock (SyncRoot)
             {