Fix nondeterministic exception order in GetManyAsDictionaryAsync and fix doc return type description

docs/en/framework/infrastructure/entity-cache.md

@@ -182,7 +182,7 @@ public class ProductAppService : ApplicationService, IProductAppService
 
 ### Dictionary-Based Batch Retrieval
 
-`FindManyAsDictionaryAsync` and `GetManyAsDictionaryAsync` return a `Dictionary<TKey, TEntityCacheItem>` keyed by entity ID, which is convenient when you need fast lookup by ID:
+`FindManyAsDictionaryAsync` and `GetManyAsDictionaryAsync` return results as a dictionary keyed by entity ID, which is convenient when you need fast lookup by ID:
 
 ```csharp
 public async Task<Dictionary<Guid, ProductDto?>> FindManyAsDictionaryAsync(List<Guid> ids)

framework/src/Volo.Abp.Ddd.Domain/Volo/Abp/Domain/Entities/Caching/EntityCacheBase.cs

@@ -94,15 +94,16 @@ public abstract class EntityCacheBase<TEntity, TEntityCacheItem, TKey> :
 
     public virtual async Task<Dictionary<TKey, TEntityCacheItem>> GetManyAsDictionaryAsync(IEnumerable<TKey> ids)
     {
-        var cacheItemDict = await GetCacheItemDictionaryAsync(ids.Distinct().ToArray());
+        var distinctIds = ids.Distinct().ToArray();
+        var cacheItemDict = await GetCacheItemDictionaryAsync(distinctIds);
         var result = new Dictionary<TKey, TEntityCacheItem>();
-        foreach (var pair in cacheItemDict)
+        foreach (var id in distinctIds)
         {
-            if (pair.Value == null)
+            if (!cacheItemDict.TryGetValue(id, out var item) || item == null)
             {
-                throw new EntityNotFoundException<TEntity>(pair.Key);
+                throw new EntityNotFoundException<TEntity>(id);
             }
-            result[pair.Key] = pair.Value;
+            result[id] = item;
         }
         return result;
     }