diff --git a/binding/csharp/IP2Region.Net/Extensions/ServiceCollectionExtensions.cs b/binding/csharp/IP2Region.Net/Extensions/ServiceCollectionExtensions.cs
index b12278d..ace55ad 100644
--- a/binding/csharp/IP2Region.Net/Extensions/ServiceCollectionExtensions.cs
+++ b/binding/csharp/IP2Region.Net/Extensions/ServiceCollectionExtensions.cs
@@ -1,4 +1,4 @@
-// Copyright 2023 The Ip2Region Authors. All rights reserved.
+// 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>
diff --git a/binding/csharp/IP2Region.Net/Internal/Abstractions/AbstractCacheStrategy.cs b/binding/csharp/IP2Region.Net/Internal/Abstractions/AbstractCacheStrategy.cs
index 8d5f06c..3509187 100644
--- a/binding/csharp/IP2Region.Net/Internal/Abstractions/AbstractCacheStrategy.cs
+++ b/binding/csharp/IP2Region.Net/Internal/Abstractions/AbstractCacheStrategy.cs
@@ -10,11 +10,6 @@ namespace IP2Region.Net.Internal.Abstractions;
 
 internal abstract class AbstractCacheStrategy
 {
-    protected const int HeaderInfoLength = 256;
-    protected const int VectorIndexRows = 256;
-    protected const int VectorIndexCols = 256;
-    protected const int VectorIndexSize = 8;
-
     protected readonly FileStream XdbFileStream;
     private const int BufferSize = 4096;
 
@@ -51,4 +46,4 @@ internal abstract class AbstractCacheStrategy
 
         return new ReadOnlyMemory<byte>(buffer, 0, totalBytesRead);
     }
-}
\ No newline at end of file
+}
diff --git a/binding/csharp/IP2Region.Net/Internal/CacheStrategyFactory.cs b/binding/csharp/IP2Region.Net/Internal/CacheStrategyFactory.cs
index 4d9b3d5..0deb198 100644
--- a/binding/csharp/IP2Region.Net/Internal/CacheStrategyFactory.cs
+++ b/binding/csharp/IP2Region.Net/Internal/CacheStrategyFactory.cs
@@ -17,4 +17,4 @@ internal class CacheStrategyFactory(string xdbPath)
         CachePolicy.VectorIndex => new VectorIndexCacheStrategy(xdbPath),
         _ => new FileCacheStrategy(xdbPath),
     };
-}
\ No newline at end of file
+}
diff --git a/binding/csharp/IP2Region.Net/Internal/ContentCacheStrategy.cs b/binding/csharp/IP2Region.Net/Internal/ContentCacheStrategy.cs
index 614495a..c455521 100644
--- a/binding/csharp/IP2Region.Net/Internal/ContentCacheStrategy.cs
+++ b/binding/csharp/IP2Region.Net/Internal/ContentCacheStrategy.cs
@@ -8,9 +8,9 @@ using IP2Region.Net.Internal.Abstractions;
 
 namespace IP2Region.Net.Internal;
 
-internal class ContentCacheStrategy : AbstractCacheStrategy
+class ContentCacheStrategy : AbstractCacheStrategy
 {
-    private readonly ReadOnlyMemory<byte> _cacheData;
+    readonly ReadOnlyMemory<byte> _cacheData;
 
     public ContentCacheStrategy(string xdbPath) : base(xdbPath)
     {
@@ -23,4 +23,4 @@ internal class ContentCacheStrategy : AbstractCacheStrategy
     {
         return _cacheData.Slice(offset, length);
     }
-}
\ No newline at end of file
+}
diff --git a/binding/csharp/IP2Region.Net/Internal/FileCacheStrategy.cs b/binding/csharp/IP2Region.Net/Internal/FileCacheStrategy.cs
index 0f98cfe..3a597b0 100644
--- a/binding/csharp/IP2Region.Net/Internal/FileCacheStrategy.cs
+++ b/binding/csharp/IP2Region.Net/Internal/FileCacheStrategy.cs
@@ -8,6 +8,7 @@ using IP2Region.Net.Internal.Abstractions;
 
 namespace IP2Region.Net.Internal;
 
-internal class FileCacheStrategy(string xdbPath) : AbstractCacheStrategy(xdbPath)
+class FileCacheStrategy(string xdbPath) : AbstractCacheStrategy(xdbPath)
 {
-}
\ No newline at end of file
+
+}
diff --git a/binding/csharp/IP2Region.Net/Internal/VectorIndexCacheStrategy.cs b/binding/csharp/IP2Region.Net/Internal/VectorIndexCacheStrategy.cs
index e9f5fac..e9eb40a 100644
--- a/binding/csharp/IP2Region.Net/Internal/VectorIndexCacheStrategy.cs
+++ b/binding/csharp/IP2Region.Net/Internal/VectorIndexCacheStrategy.cs
@@ -10,11 +10,16 @@ namespace IP2Region.Net.Internal;
 
 internal class VectorIndexCacheStrategy : AbstractCacheStrategy
 {
-    private readonly ReadOnlyMemory<byte> _vectorIndex;
+    const int HeaderInfoLength = 256;
+    const int VectorIndexRows = 256;
+    const int VectorIndexCols = 256;
+    const int VectorIndexSize = 8;
+
+    readonly ReadOnlyMemory<byte> _vectorIndex;
 
     public VectorIndexCacheStrategy(string xdbPath) : base(xdbPath)
     {
         var vectorLength = VectorIndexRows * VectorIndexCols * VectorIndexSize;
         _vectorIndex = base.GetData(HeaderInfoLength, vectorLength);
     }
-}
\ No newline at end of file
+}
diff --git a/binding/csharp/IP2Region.Net/XDB/CachePolicy.cs b/binding/csharp/IP2Region.Net/XDB/CachePolicy.cs
index 0f4d035..9397ee0 100644
--- a/binding/csharp/IP2Region.Net/XDB/CachePolicy.cs
+++ b/binding/csharp/IP2Region.Net/XDB/CachePolicy.cs
@@ -1,17 +1,22 @@
 namespace IP2Region.Net.XDB;
 
+/// <summary>
+/// 缓存策略枚举
+/// </summary>
 public enum CachePolicy
 {
     /// <summary>
     /// no cache 
     /// </summary>
     File,
+
     /// <summary>
     /// cache vector index , reduce the number of IO operations
     /// </summary>
     VectorIndex,
+
     /// <summary>
     /// default cache policy , cache whole xdb file
     /// </summary>
     Content
-}
\ No newline at end of file
+}
diff --git a/binding/csharp/IP2Region.Net/XDB/Searcher.cs b/binding/csharp/IP2Region.Net/XDB/Searcher.cs
index 60690c8..5fcbf30 100644
--- a/binding/csharp/IP2Region.Net/XDB/Searcher.cs
+++ b/binding/csharp/IP2Region.Net/XDB/Searcher.cs
@@ -13,29 +13,47 @@ using System.Text;
 
 namespace IP2Region.Net.XDB;
 
+/// <summary>
+/// <see cref="ISearcher"/> 实现类
+/// </summary>
 public class Searcher : ISearcher
 {
     private readonly AbstractCacheStrategy _cacheStrategy;
 
+    /// <summary>
+    /// <inheritdoc/>
+    /// </summary>
     public int IoCount => _cacheStrategy.IoCount;
 
+    /// <summary>
+    /// <inheritdoc/>
+    /// </summary>
     public Searcher(CachePolicy cachePolicy, string dbPath)
     {
         var factory = new CacheStrategyFactory(dbPath);
         _cacheStrategy = factory.CreateCacheStrategy(cachePolicy);
     }
 
+    /// <summary>
+    /// <inheritdoc/>
+    /// </summary>
     public string? Search(string ipStr)
     {
         var ipAddress = IPAddress.Parse(ipStr);
         return Search(ipAddress);
     }
 
+    /// <summary>
+    /// <inheritdoc/>
+    /// </summary>
     public string? Search(IPAddress ipAddress)
     {
         return SearchCore(ipAddress.GetAddressBytes());
     }
 
+    /// <summary>
+    /// <inheritdoc/>
+    /// </summary>
     public string? Search(uint ipAddress)
     {
         var bytes = BitConverter.GetBytes(ipAddress);
diff --git a/binding/csharp/IP2Region.Net/XDB/Util.cs b/binding/csharp/IP2Region.Net/XDB/Util.cs
index b151df2..f593a9b 100644
--- a/binding/csharp/IP2Region.Net/XDB/Util.cs
+++ b/binding/csharp/IP2Region.Net/XDB/Util.cs
@@ -5,6 +5,9 @@ using System.Runtime.InteropServices;
 
 namespace IP2Region.Net.XDB;
 
+/// <summary>
+/// 工具类
+/// </summary>
 public static class Util
 {
     public static uint IpAddressToUInt32(string ipAddress)
diff --git a/binding/csharp/IP2Region.Net/XDB/XdbVersion.cs b/binding/csharp/IP2Region.Net/XDB/XdbVersion.cs
index 1fdb743..e93e9db 100644
--- a/binding/csharp/IP2Region.Net/XDB/XdbVersion.cs
+++ b/binding/csharp/IP2Region.Net/XDB/XdbVersion.cs
@@ -1,5 +1,8 @@
-namespace IP2Region.Net.XDB;
+namespace IP2Region.Net.XDB;
 
+/// <summary>
+/// XdbVersion 结构体
+/// </summary>
 public struct XdbVersion
 {
     /// <summary>