feat:support for concurrent file-based queries

binding/csharp/IP2Region.Net/Abstractions/ISearcher.cs

@@ -0,0 +1,20 @@
+// Copyright 2023 The Ip2Region Authors. All rights reserved.
+// Use of this source code is governed by a Apache2.0-style
+// license that can be found in the LICENSE file.
+// @Author Alan <lzh.shap@gmail.com>
+// @Date   2023/07/25
+
+using System.Net;
+
+namespace IP2Region.Net.Abstractions;
+
+public interface ISearcher
+{
+    string? Search(string ipStr);
+
+    string? Search(IPAddress ipAddress);
+
+    string? Search(uint ipAddress);
+
+    int IoCount { get; }
+}