如何从url获取json字符串?

I'm switching my code form XML to JSON.

我将代码从XML转换为JSON。

But I can't find how to get a JSON string from a given url.

但是我找不到如何从给定的url获取JSON字符串。

URL是这样的:" https://api.facebook.com/method/fqlquery? query. & formatjson "

I used XDocuments before, there I could use the load method:

我之前用过XDocuments，在那里我可以使用load方法:

XDocument doc = XDocument.load("URL");

What is the equivalent of this method for JSON? I'm using JSON.NET.

JSON对应的方法是什么?我使用JSON.NET。

3 个解决方案

217

Use the WebClient class in System.Net:

在System.Net中使用WebClient类:

var json = new WebClient().DownloadString("url");

Keep in mind that WebClient is IDisposable, so you would probably add a using statement to this in production code. This would look like:

请记住，WebClient是IDisposable，因此您可能会在产品代码中添加一条using语句。这样子:

using (WebClient wc = new WebClient())
{
   var json = wc.DownloadString("url");
}

AFAIK JSON.Net does not provide functionality for reading from a URL. So you need to do this in two steps:

JSON的。Net不提供从URL读取的功能。所以你需要分两个步骤来做:

using (var webClient = new System.Net.WebClient()) {
    var json = webClient.DownloadString(URL);
    // Now parse with JSON.Net
}

If you're using .NET 4.5 and want to use async then you can use HttpClient in System.Net.Http:

如果您正在使用。net 4.5并且希望使用异步，那么您可以在System.Net.Http:

using (var httpClient = new HttpClient())
{
    var json = await httpClient.GetStringAsync("url");

    // Now parse with JSON.Net
}

217