first commit

backend/F9WebAiTest.Application/Common/Exceptions/F9NotFoundException.cs

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+namespace F9WebAiTest.Application.Common.Exceptions;
+
+/// <summary>资源不存在异常</summary>
+public class F9NotFoundException : Exception
+{
+    public F9NotFoundException(string resourceName, object key)
+        : base($"{resourceName}不存在'{key}'。")
+    {
+    }
+
+    public F9NotFoundException(string message) : base(message) { }
+}