refactor: 增加键值匹配规则

Author: ArgoZhang

src/BootstrapBlazor.Server/Services/CodeSnippetService.cs

@@ -62,8 +62,8 @@ public async Task<string> GetCodeAsync(string codeFile)
         {
             // codeFile = ajax.razor.cs
             var segs = codeFile.Split('.');
-            var key = segs[0].ToLowerInvariant();
-            var typeName = SourceCodes.TryGetValue(key, out var value) ? value : string.Empty;
+            var key = segs[0];
+            var typeName = SourceCodes.TryGetValue(key.ToLowerInvariant(), out var value) ? value : string.Empty;
             if (!string.IsNullOrEmpty(typeName))
             {
                 var fileName = codeFile.Replace(key, typeName);