修改文件名，保证类名跟文件名相同

CommonLibrary/CommonLibrary.csproj

@@ -62,7 +62,7 @@
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
-    <Compile Include="IpAddressAttribute.cs" />
+    <Compile Include="IpV4AddressAttribute.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
   </ItemGroup>
   <ItemGroup>