添加元组、AnalysisLevel、DistinctBy 的 PLINQ 形式

Extensions/EnumerableExtensions.cs

@@ -1,4 +1,6 @@
-namespace MeloongCore.Extensions;
+using System.Collections.Concurrent;
+
+namespace MeloongCore.Extensions;
 public static class EnumerableExtensions {
 
     #region Distinct
@@ -21,6 +23,13 @@ public static class EnumerableExtensions {
             if (seen.Add(selector(element))) yield return element;
         }
     }
+    /// <summary>
+    /// 按对象的指定值去重。
+    /// </summary>
+    public static ParallelQuery<T> DistinctBy<T, TKey>(this ParallelQuery<T> source, Func<T, TKey> selector) {
+        var seen = new ConcurrentDictionary<TKey, bool>();
+        return source.Where(element => seen.TryAdd(selector(element), true));
+    }
 
     #endregion
 

MeloongCore.csproj

@@ -11,6 +11,7 @@
 		<Deterministic>true</Deterministic>
 		<LangVersion>13.0</LangVersion>
 		<Nullable>enable</Nullable>
+		<AnalysisLevel>8.0</AnalysisLevel>
 	</PropertyGroup>
 
 	<ItemGroup>
@@ -18,6 +19,7 @@
 	    <PrivateAssets>all</PrivateAssets>
 	    <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
 	  </PackageReference>
+	  <PackageReference Include="System.ValueTuple" Version="4.6.1" />
 	</ItemGroup>
 
 	<ItemGroup>