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   源码介绍

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原理：ActionFilterAttribute

public class ReplaceTagsFilter : MemoryStream
{
    private readonly Stream _response;
    public ReplaceTagsFilter(Stream response)
    {
        _response = response;
    }

    public override void Write(byte[] buffer, int offset, int count)
    {
        var html = Encoding.UTF8.GetString(buffer);
        html = ReplaceTags(html);
        buffer = Encoding.UTF8.GetBytes(html);
        _response.Write(buffer, offset, buffer.Length);
    }

    private string ReplaceTags(string html)
    {
        // TODO: go ahead and implement the filtering logic
        throw new NotImplementedException();
    }
}


public class ReplaceTagsAttribute : ActionFilterAttribute
{
    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
        var response = filterContext.HttpContext.Response;
        response.Filter = new ReplaceTagsFilter(response.Filter);
    }
}


[ReplaceTags]
public ActionResult Index()
{
    return View();
}