refactor: ♻️ 2.0 (#3)

src/backend/NSExt/Extensions/EnumerableExtensions.cs

@@ -0,0 +1,26 @@
+namespace NSExt.Extensions;
+
+/// <summary>
+///     EnumerableExtensions
+/// </summary>
+public static class EnumerableExtensions
+{
+    /// <summary>
+    ///     将列表转成分隔符分隔的字符串
+    /// </summary>
+    public static string Join(this IEnumerable<object> me, string separator)
+    {
+        return string.Join(separator, me);
+    }
+
+    /// <summary>
+    ///     判断对象是否为null或不存在子元素（如果为集合对象）
+    /// </summary>
+    /// <typeparam name="T">对象类型</typeparam>
+    /// <param name="me">me</param>
+    /// <returns>空则返回true</returns>
+    public static bool NullOrEmpty<T>(this IEnumerable<T> me)
+    {
+        return me?.Any() != true;
+    }
+}