通过使用Response.OnStarting事件在中间件的末尾手动添加Cache-Control标头。

示例代码：

public class CacheMiddleware
{
    private readonly RequestDelegate _next;

    public CacheMiddleware(RequestDelegate next)
    {
        _next = next;
    }

    public async Task Invoke(HttpContext context)
    {
        // Call the next middleware in the pipeline
        await _next(context);

        // Set the Cache-Control header if it hasn't already been set
        if (!context.Response.Headers.ContainsKey("Cache-Control"))
        {
            context.Response.Headers.Add("Cache-Control", "max-age=3600");
        }
    }
}

在Startup.cs文件中，将CacheMiddleware添加到中间件管道中：

app.UseMiddleware();