feat: ✨ 异步累加器函数 (#17)

src/backend/NSExt/Extensions/EnumerableExtensions.cs

@@ -5,6 +5,26 @@ namespace NSExt.Extensions;
 /// </summary>
 public static class EnumerableExtensions
 {
+    /// <summary>
+    ///     异步累加器函数
+    /// </summary>
+    /// <exception cref="InvalidOperationException">InvalidOperationException</exception>
+    public static async Task<TSource> AggregateAsync<TSource>( //
+        this IEnumerable<TSource> source, Func<TSource, TSource, Task<TSource>> func)
+    {
+        using var e = source.GetEnumerator();
+        if (!e.MoveNext()) {
+            throw new InvalidOperationException("Sequence contains no elements");
+        }
+
+        var result = e.Current;
+        while (e.MoveNext()) {
+            result = await func(result, e.Current).ConfigureAwait(false);
+        }
+
+        return result;
+    }
+
     /// <summary>
     ///     将列表转成分隔符分隔的字符串
     /// </summary>