1

Src/Core/Extensions/DisplayAttributeExtensions.cs

@@ -27,11 +27,12 @@ namespace BITKit
                 {
                     return displayNameAttribute.DisplayName;
                 }
-
+#if NET5_0_OR_GREATER
                 if (self.GetType().GetCustomAttribute<DisplayAttribute>() is { } displayAttribute)
                 {
                     return displayAttribute.Name;
                 }
+#endif
             }
             {
                 if (self is Enum)
@@ -42,11 +43,12 @@ namespace BITKit
                     {
                         return displayNameAttribute.DisplayName;
                     }
-
+#if NET5_0_OR_GREATER
                     if (field.GetCustomAttribute<DisplayAttribute>() is DisplayAttribute displayAttribute)
                     {
                         return displayAttribute.Name;
                     }
+#endif
                 }
             }
             return self.ToString();

Src/Core/Extensions/DisplayAttributeExtensions.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 56c780c378f03f4419272fb5ae8dfb1d
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Src/Core/Extensions/IEnumerable.cs

@@ -2,6 +2,8 @@
 using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
+using Unity.Mathematics;
+using Random = System.Random;
 
 namespace BITKit
 {
@@ -198,6 +200,22 @@ namespace BITKit
         {
             return self[typeof(TKey)];
         }
+
+        public static TValue[] TakeRandom<TValue>(this TValue[] self, int count)
+        {
+            //自动实现
+            var random = new Random();
+            var newList = self.ToList();
+            count = math.min(count, newList.Count);
+            var result = new TValue[count];
+            for (var i = 0; i < count; i++)
+            {
+                var value = newList[random.Next(0, newList.Count)];
+                newList.Remove(value);
+                result[i] = value;
+            }
+            return result;
+        }
         public static TValue Get<TKey, TValue>(this IDictionary<TKey, TValue> self, TKey key) where TValue : new()
         {
             lock (self)