.net 抛出HttpResponseException的web api以及如何在wpf客户端上接收

从我的wpf客户端，我向web api发送异步请求，在这个场景中，web api应该返回HttpResponseException，所以我尝试了

HttpResponseMessage response = new HttpResponseMessage();
response = client.GetAsync(url).Result;
if (response.IsSuccessStatusCode)
{
   ...
} else {
    MessageBox.Show("Not active" + response.StatusCode + " : Message - " + response.ReasonPhrase);
}

WebApi端

private void GetData()
{
   try {
      data = RavenSession.Query<myobj>().Take(1024).ToList();
   } catch (WebException) {
         throw new HttpResponseException(Request.CreateResponse(HttpStatusCode.ServiceUnavailable, "Database is not online!"));
   }
}

---

但接球挡根本没有被击中。我只能访问

响应。IsSuccessStatusCode

，但这样我无法从webservice向客户端返回详细的消息异常（我想显示详细消息）。

从客户端读取错误消息

并根据需要格式化字符串

参考：（在文章中搜索“反序列化响应内容”）

try{
    HttpResponseMessage response = new HttpResponseMessage();
    response = client.GetAsync(url).Result;
    if (response.IsSuccessStatusCode)
    {
       ...
    } else {
        MessageBox.Show("Not active" + response.StatusCode + " : Message - " + response.ReasonPhrase);
    }
}
catch(HttpResponseException e){
     MessageBox.Show(e.Message);
}
catch(Exception e){
     MessageBox.Show(e.Message);
}

if (response.IsSuccessStatusCode)
{
   ...
} else {
    var errorMessage = response.Content.ReadAsStringAsync().Result; 
}