[英]Return jsonp from self hosted WEB API Console app
I've use the jsonp formatter described in this blog post: http://www.west-wind.com/weblog/posts/2012/Apr/02/Creating-a-JSONP-Formatter-for-ASPNET-Web-API 我使用了这篇博文中描述的jsonp格式化程序: http : //www.west-wind.com/weblog/posts/2012/Apr/02/Creating-a-JSONP-Formatter-for-ASPNET-Web-API
Has anybody tried using the formatter with a self hosted console application? 有没有人尝试使用带有自托管控制台应用程序的格式化程序?
I've tried the formatter in a regular MVC 4 project, and it worked immediately. 我在常规MVC 4项目中尝试过格式化程序,它立即起作用。 However, I would like to use it in a self hosted console application, and I've had a lot of trouble getting it to work.
但是,我想在自托管控制台应用程序中使用它,我在使用它时遇到了很多麻烦。
I've registered the formatter, and verified that it is added: 我已注册格式化程序,并验证它已添加:
var config = new HttpSelfHostConfiguration(serviceUrl);
config.Formatters.Insert(0, new JsonpMediaTypeFormatter());
I have verified that the formatter is being called when I make a request with the following code: 我已经验证在使用以下代码发出请求时正在调用格式化程序:
$("#TestButton").click(function () {
$.ajax({
url: 'http://localhost:8082/Api/Test',
type: 'GET',
dataType: 'jsonp',
success: function(data) {
alert(data.TestProperty);
}
});
})
I've checked in Fiddler, and the response I get is: 我已经检查了Fiddler,我得到的回答是:
HTTP/1.1 504 Fiddler - Receive Failure
Content-Type: text/html; charset=UTF-8
Connection: close
Timestamp: 09:30:51.813
[Fiddler] ReadResponse() failed: The server did not return a response for this request.
I'd be really grateful if anybody can shed some light on what is going on! 如果有人能够了解正在发生的事情,我将非常感激!
Thanks, 谢谢,
Francis 弗朗西斯
I suspect that Disposing the StreamWriter causes issues here. 我怀疑Disposing StreamWriter会导致问题。 Try adapting the
WriteToStreamAsync
method: 尝试调整
WriteToStreamAsync
方法:
public override Task WriteToStreamAsync(
Type type,
object value,
Stream stream,
HttpContent content,
TransportContext transportContext
)
{
if (string.IsNullOrEmpty(JsonpCallbackFunction))
{
return base.WriteToStreamAsync(type, value, stream, content, transportContext);
}
// write the JSONP pre-amble
var preamble = Encoding.ASCII.GetBytes(JsonpCallbackFunction + "(");
stream.Write(preamble, 0, preamble.Length);
return base.WriteToStreamAsync(type, value, stream, content, transportContext).ContinueWith((innerTask, state) =>
{
if (innerTask.Status == TaskStatus.RanToCompletion)
{
// write the JSONP suffix
var responseStream = (Stream)state;
var suffix = Encoding.ASCII.GetBytes(")");
responseStream.Write(suffix, 0, suffix.Length);
}
}, stream, TaskContinuationOptions.ExecuteSynchronously);
}
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