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Add DictionaryExtensions.SequenceEqual
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‎tracer/src/Datadog.Trace/ExtensionMethods/DictionaryExtensions.cs‎

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@@ -7,6 +7,7 @@
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using System.Collections;
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using System.Collections.Concurrent;
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using System.Collections.Generic;
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using System.Collections.ObjectModel;
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using Datadog.Trace.Util;
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namespace Datadog.Trace.ExtensionMethods
@@ -128,5 +129,42 @@ public static TV Get<TK, TV>(this Dictionary<TK, TV> map, TK key, Func<TK, TV> c
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map[key] = newVal;
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return newVal;
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}
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/// <summary>
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/// Checks if two dictionaries contain the same keys and values.
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/// Note that this method assumes the two dictionaries use the same
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/// <see cref="IEqualityComparer"/>; using different comparers in each
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/// dictionary is not supported.
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/// </summary>
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public static bool SequenceEqual(
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this ReadOnlyDictionary<string, string> dict1,
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ReadOnlyDictionary<string, string> dict2,
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StringComparison valueComparison = StringComparison.Ordinal)
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{
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if (dict1 is null & dict2 is null)
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{
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return true;
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}
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if (dict1 is null || dict2 is null || dict1.Count != dict2.Count)
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{
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return false;
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}
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if (dict1.Count == 0 && dict2.Count == 0)
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{
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return true;
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}
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foreach (var kvp1 in dict1)
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{
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if (!dict2.TryGetValue(kvp1.Key, out var val2) || !string.Equals(kvp1.Value, val2, valueComparison))
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{
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return false;
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}
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}
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return true;
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}
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}
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}

‎tracer/test/Datadog.Trace.Tests/ExtensionMethods/DictionaryExtensionsTests.cs‎

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// <copyright file="DictionaryExtensionsTests.cs" company="Datadog">
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// Unless explicitly stated otherwise all files in this repository are licensed under the Apache 2 License.
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// This product includes software developed at Datadog (https://www.datadoghq.com/). Copyright 2017 Datadog, Inc.
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// </copyright>
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using System;
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using System.Collections.Generic;
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using System.Collections.ObjectModel;
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using Datadog.Trace.ExtensionMethods;
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using Datadog.Trace.Util;
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using FluentAssertions;
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using Xunit;
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namespace Datadog.Trace.Tests.ExtensionMethods;
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public class DictionaryExtensionsTests
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{
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[Fact]
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public void SequenceEqual_HandlesBothNull()
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{
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ReadOnlyDictionary<string, string> dict1 = null;
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dict1!.SequenceEqual(null).Should().BeTrue();
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}
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[Fact]
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public void SequenceEqual_HandlesOneNull()
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{
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ReadOnlyDictionary<string, string> dict1 = null;
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ReadOnlyDictionary<string, string> dict2 = ReadOnlyDictionary.Empty;
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dict1!.SequenceEqual(dict2).Should().BeFalse();
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dict2!.SequenceEqual(dict1).Should().BeFalse();
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}
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[Fact]
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public void SequenceEqual_HandlesEmpty()
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{
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ReadOnlyDictionary<string, string> dict1 = ReadOnlyDictionary.Empty;
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ReadOnlyDictionary<string, string> dict2 = ReadOnlyDictionary.Empty;
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dict1.SequenceEqual(dict2).Should().BeTrue();
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dict2.SequenceEqual(dict1).Should().BeTrue();
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}
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[Fact]
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public void SequenceEqual_HandlesDifferentSizes()
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{
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ReadOnlyDictionary<string, string> dict1 = new(new Dictionary<string, string> { { "key", "value" } });
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ReadOnlyDictionary<string, string> dict2 = ReadOnlyDictionary.Empty;
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dict1.SequenceEqual(dict2).Should().BeFalse();
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dict2.SequenceEqual(dict1).Should().BeFalse();
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}
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[Fact]
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public void SequenceEqual_HandlesDifferentKeys()
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{
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ReadOnlyDictionary<string, string> dict1 = new(new Dictionary<string, string> { { "key1", "value" } });
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ReadOnlyDictionary<string, string> dict2 = new(new Dictionary<string, string> { { "key2", "value" } });
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dict1.SequenceEqual(dict2).Should().BeFalse();
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dict2.SequenceEqual(dict1).Should().BeFalse();
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}
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[Theory]
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[InlineData("value2")]
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[InlineData("VALUE1")]
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[InlineData("value1 ")]
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[InlineData(" value1 ")]
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[InlineData("")]
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[InlineData(null)]
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public void SequenceEqual_HandlesDifferentValues(string value)
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{
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ReadOnlyDictionary<string, string> dict1 = new(new Dictionary<string, string> { { "key", "value1" } });
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ReadOnlyDictionary<string, string> dict2 = new(new Dictionary<string, string> { { "key", value } });
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dict1.SequenceEqual(dict2).Should().BeFalse();
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dict2.SequenceEqual(dict1).Should().BeFalse();
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}
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[Fact]
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public void SequenceEqual_UsesDictionaryKeyComparer()
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{
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ReadOnlyDictionary<string, string> dict1 = new(new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase) { { "key", "value" } });
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ReadOnlyDictionary<string, string> dict2 = new(new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase) { { "KEY", "value" } });
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dict1.SequenceEqual(dict2).Should().BeTrue();
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dict2.SequenceEqual(dict1).Should().BeTrue();
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}
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[Fact]
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public void SequenceEqual_UsesDictionaryWithDifferentComparersIsNotSupported()
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{
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ReadOnlyDictionary<string, string> dict1 = new(new Dictionary<string, string>(StringComparer.Ordinal) { { "key", "value" } });
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ReadOnlyDictionary<string, string> dict2 = new(new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase) { { "KEY", "value" } });
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// reversing the order changes the result
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dict1.SequenceEqual(dict2).Should().BeTrue();
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dict2.SequenceEqual(dict1).Should().BeFalse();
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}
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[Theory]
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[InlineData(StringComparison.Ordinal, "value", true)]
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[InlineData(StringComparison.Ordinal, "VALUE", false)]
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[InlineData(StringComparison.OrdinalIgnoreCase, "VALUE", true)]
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public void SequenceEqual_UsesComparer(StringComparison comparison, string value, bool expected)
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{
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ReadOnlyDictionary<string, string> dict1 = new(new Dictionary<string, string> { { "key", "value" } });
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ReadOnlyDictionary<string, string> dict2 = new(new Dictionary<string, string> { { "key", value } });
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// reversing the order changes the result
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dict1.SequenceEqual(dict2, comparison).Should().Be(expected);
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dict2.SequenceEqual(dict1, comparison).Should().Be(expected);
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}
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}

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