diff --git a/binding/csharp/IP2Region.Net/Internal/ContentCacheStrategy.cs b/binding/csharp/IP2Region.Net/Internal/ContentCacheStrategy.cs
index 94e7f51..ad3e2ba 100644
--- a/binding/csharp/IP2Region.Net/Internal/ContentCacheStrategy.cs
+++ b/binding/csharp/IP2Region.Net/Internal/ContentCacheStrategy.cs
@@ -8,18 +8,18 @@ using IP2Region.Net.Internal.Abstractions;
 
 namespace IP2Region.Net.Internal;
 
-class ContentCacheStrategy(string xdbPath) : AbstractCacheStrategy(xdbPath)
+class ContentCacheStrategy : AbstractCacheStrategy
 {
     ReadOnlyMemory<byte> _cacheData = default;
 
+    public ContentCacheStrategy(string xdbPath) : base(xdbPath)
+    {
+        using var reader = base.GetXdbFileStream();
+        _cacheData = base.GetData(0, (int)reader.Length);
+    }
+
     public override ReadOnlyMemory<byte> GetData(int offset, int length)
     {
-        if (_cacheData.IsEmpty)
-        {
-            using var reader = base.GetXdbFileStream();
-            _cacheData = base.GetData(0, (int)reader.Length);
-        }
-
         return _cacheData.Slice(offset, length);
     }
 }
diff --git a/binding/csharp/IP2Region.Net/Internal/VectorIndexCacheStrategy.cs b/binding/csharp/IP2Region.Net/Internal/VectorIndexCacheStrategy.cs
index 4dea3fe..f34b1b2 100644
--- a/binding/csharp/IP2Region.Net/Internal/VectorIndexCacheStrategy.cs
+++ b/binding/csharp/IP2Region.Net/Internal/VectorIndexCacheStrategy.cs
@@ -8,16 +8,14 @@ using IP2Region.Net.Internal.Abstractions;
 
 namespace IP2Region.Net.Internal;
 
-internal class VectorIndexCacheStrategy(string xdbPath) : AbstractCacheStrategy(xdbPath)
+internal class VectorIndexCacheStrategy : AbstractCacheStrategy
 {
     ReadOnlyMemory<byte> _vectorCahe = default;
 
-    public override ReadOnlyMemory<byte> GetVectorIndexStartPos(int offset)
+    public VectorIndexCacheStrategy(string xdbPath) : base(xdbPath)
     {
-        if (_vectorCahe.IsEmpty)
-        {
-            _vectorCahe = base.GetData(256, 256 * 256 * 8);
-        }
-        return _vectorCahe.Slice(offset, 8);
+        _vectorCahe = base.GetData(256, 256 * 256 * 8);
     }
+
+    public override ReadOnlyMemory<byte> GetVectorIndexStartPos(int offset) => _vectorCahe.Slice(offset, 8);
 }