dev: 渲染服务和文件内容服务

YaeBlog.Core/Services/EssayContentService.cs

@@ -0,0 +1,18 @@
+using System.Collections.Concurrent;
+using YaeBlog.Core.Models;
+
+namespace YaeBlog.Core.Services;
+
+public class EssayContentService
+{
+    private readonly ConcurrentDictionary<string, BlogEssay> _essays = new();
+
+    public bool TryGet(string key, out BlogEssay? essay)
+        => _essays.TryGetValue(key, out essay);
+
+    public bool TryAdd(string key, BlogEssay essay) => _essays.TryAdd(key, essay);
+
+    public IEnumerable<KeyValuePair<string, BlogEssay>> Essays => _essays;
+
+    public int Count => _essays.Count;
+}