Question

我有这个Webservice方法，用于从数据库中获取音频。服务器端：

[WebMethod]
  public void PlayAudio(int id)
  {
      byte[] bytes = new byte[0];
      using (The_FactoryDBContext db = new The_FactoryDBContext())
      {
          if (db.Words.FirstOrDefault(word => word.wordID == id).engAudio != null)
          {
              bytes = db.Words.FirstOrDefault(word => word.wordID == id).engAudio;

              MemoryStream ms = new MemoryStream(bytes);



            Context.Response.Clear();
            Context.Response.AddHeader("ContentType ", "audio/wav");
            Context.Response.BinaryWrite(ms.ToArray());
            Context.Response.Flush();
            Context.Response.Close();
          }
     }
  }

我有这段代码在浏览器中播放此音频：

var audio = document.createElement('audio');

            audio.id = "test";
            audio.autoplay = false;
            audio.preload = true;
            audio.oncanplaythrough = function () {
                foo.disabled = false;
            };
            var id = $("[id$=hiddenWord_id]").val();


            audio.src =// below are the different ways ive tried


            foo.onclick = function () {
                audio.play();
            }

我试过这个：

audio.src = "../../WebService.asmx/PlayAudio/?id=" + id;

这是为了到达webservie

document.getElementById('test').src = PlayAudio();

function PlayAudio() {
                var id = $("[id$=hiddenWord_id]").val();
                $.ajax({

                    url: "../../WebService.asmx/PlayAudio",
                    data: "{ 'id': '" + id + "'}",
                    dataType: "json",
                    type: "POST",
                    contentType: "application/json; charset=utf-8",
                    success: function (data) {
                    },
                    error: function (XMLHttpRequest, textStatus, errorThrown) {
                    }
                });

            };

然而，上述情况似乎都不起作用。

Answer 1

将其改写为ASHX。包括以下类（自己添加命名空间和使用语句，将文件命名为AudioHandler.ashx.cs）：

public class AudioHandler : IHttpHandler
{
    public bool IsReusable
    {
        get { return true; }
    }

    public void ProcessRequest(HttpContext context)
    {
        int id = Convert.ToInt32(context.Request.QueryString["id"]);
        byte[] bytes = new byte[0];
        using (The_FactoryDBContext db = new The_FactoryDBContext())
        {
            if (db.Words.FirstOrDefault(word => word.wordID == id).engAudio != null)
            {
                bytes = db.Words.FirstOrDefault(word => word.wordID == id).engAudio;

                context.Response.ContentType = "audio/wav";
                context.Response.BinaryWrite(bytes);
                context.Response.Flush();
            }
        }
    }

}

根据您的.NET版本，通过在web.config中指定处理程序或在站点的根目录中添加audiohandler.ashx文件来添加处理程序。将以下内容粘贴在其中：

<%@ WebHandler Language="C#" Class="AudioHandler" %>

现在您可以通过

调用该服务

audio.src = "/AudioHandler.ashx?id=" + id;

您可以扩展ASHX文件以使其更加健壮（如果没有ID或者例如它不是有效整数，那该怎么办）

如何将Webservice方法链接到音频的src元素？

1 个答案: