你好我是android开发的初学者
我在C＃上用xamarin编写android应用程序。我有产品清单的活动。
从API解析产品
示例：
Array
(
[0] => WP_Post Object
(
[ID] => 4538
[post_author] => 7
[post_date] => 2015-10-11 21:42:27
[post_date_gmt] => 2015-10-11 17:42:27
[post_content] =>
[post_title] => Рол Філадельфія з лососем
[post_excerpt] => Рис, Лосось, Норі, Сир Філадельфія, Авокадо, Ікра масаго
[post_status] => publish
[comment_status] => open
[ping_status] => closed
[post_password] =>
[post_name] => rol-filadelfiya-z-lososem
[to_ping] =>
[pinged] =>
[post_modified] => 2015-10-12 10:41:11
[post_modified_gmt] => 2015-10-12 06:41:11
[post_content_filtered] =>
[post_parent] => 0
[guid] => http://new.murakami.ua/shop/rol-filadelfiya-z-lososem/
[menu_order] => 0
[post_type] => product
[post_mime_type] =>
[comment_count] => 0
[filter] => raw
[img_url] => http://new.murakami.ua/wp-content/uploads/Rol-Filadelfiya-z-lososem1.jpg
[visibility] => visible
[price] => 106.00
[weight] => 215
[energy] => 0
[sku] => 423
[category] => 87
)
[1] => WP_Post Object
(
[ID] => 4533
[post_author] => 4
[post_date] => 2015-10-09 17:32:51
[post_date_gmt] => 2015-10-09 13:32:51
[post_content] =>
[post_title] => Васабі
[post_excerpt] => на 1 сушку 2гр; на 1 ролл 4 гр; на набор
[post_status] => publish
[comment_status] => open
[ping_status] => closed
[post_password] =>
[post_name] => vasabi
[to_ping] =>
[pinged] =>
[post_modified] => 2015-10-11 22:22:19
[post_modified_gmt] => 2015-10-11 18:22:19
[post_content_filtered] =>
[post_parent] => 0
[guid] => http://new.murakami.ua/shop/vasabi/
[menu_order] => 0
[post_type] => product
[post_mime_type] =>
[comment_count] => 0
[filter] => raw
[img_url] => http://new.murakami.ua/wp-content/uploads/Vasabi.jpg
[visibility] => visible
[price] => 7.00
[weight] => 4
[energy] =>
[sku] => 822
[category] => 90
)
[2] => WP_Post Object
(
[ID] => 4378
[post_author] => 4
[post_date] => 2015-10-01 12:47:54
[post_date_gmt] => 2015-10-01 08:47:54
[post_content] =>
[post_title] => Ямато
[post_excerpt] => Курячий бульйон з яйцем / салат овочевий з заправкою насу / крохмальна локшина з овочами та свининою
[post_status] => publish
[comment_status] => open
[ping_status] => closed
[post_password] =>
[post_name] => yamato-0
[to_ping] =>
[pinged] =>
[post_modified] => 2015-10-08 14:38:18
[post_modified_gmt] => 2015-10-08 10:38:18
[post_content_filtered] =>
[post_parent] => 0
[guid] => http://new.murakami.ua/shop/yamato-0/
[menu_order] => 0
[post_type] => product
[post_mime_type] =>
[comment_count] => 0
[filter] => raw
[img_url] => http://new.murakami.ua/wp-content/uploads/YAmato.jpg
[visibility] => visible
[price] => 99.00
[weight] => 225/110/175
[energy] =>
[sku] => 172
[category] => 182
)
我在从URL激活活动时解析它。
代码：
string url2 = "http://new.murakami.ua/?mkapi=getProducts";
JsonValue json = await FetchAsync(url2);
ParseAndDisplay1(json);
ParseAndDisplay2(json);
ParseAndDisplay3(json);
ParseAndDisplay4(json);
ParseAndDisplay5(json);
private async Task<JsonValue> FetchAsync(string url)
{
// Create an HTTP web request using the URL:
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(new Uri(url));
request.ContentType = "application/json";
request.Method = "GET";
// Send the request to the server and wait for the response:
using (WebResponse response = await request.GetResponseAsync())
{
// Get a stream representation of the HTTP web response:
using (Stream stream = response.GetResponseStream())
{
// Use this stream to build a JSON document object:
JsonValue jsonDoc = await Task.Run(() => JsonObject.Load(stream));
//dynamic data = JObject.Parse(jsonDoc[15].ToString);
Console.Out.WriteLine("Response: {0}", jsonDoc.ToString());
// Return the JSON document:
return jsonDoc;
}
}
}
private void ParseAndDisplay1(JsonValue json)
{
//ImageButton product = FindViewById<ImageButton>(Resource.Id.vugor);
TextView productname = FindViewById<TextView>(Resource.Id.posttittle);
TextView price = FindViewById<TextView>(Resource.Id.price);
TextView weight = FindViewById<TextView>(Resource.Id.weight);
productname.Click += delegate
{
var intent485 = new Intent(this, typeof(GoryachieZakuskiDetailActivity1));
StartActivity(intent485);
};
JsonValue firstitem = json[10];
//Console.Out.WriteLine(firstitem["post_title"].ToString());
productname.Text = firstitem["post_title"];
price.Text = firstitem["price"] + " грн";
weight.Text = firstitem["weight"] + "г";
}
我想将它解析一次到文本文件。并从文件中获取信息。
我怎么能这样做？
答案 0 :(得分：3)
@CDrosos建议应该起作用，有一点来自我： - ）
此外，您还可以使用File.WriteAllText（内部使用StreamWriter）将一串文本保存到文件中，但使用起来要简单得多：
bool SaveJson(string json)
{
var documentFolder = Environment.GetFolderPath (Environment.SpecialFolder.MyDocuments);
var fileNamePath = Path.Combine (documentFolder, "Products.json");
File.WriteAllText(fileNamePath, json);
return File.Exists(fileNamePath);
}
您当然可以使此方法更通用，以便允许传递文件名和默认文件夹路径等。它可以被其他类使用。允许你的代码相当干（不要重复自己的原则）：
bool SaveText(string json, string fileName, string folderPath)
{
var fileNamePath = Path.Combine (folderPath, filename);
File.WriteAllText(fileNamePath, json);
return File.Exists(fileNamePath);
}
然后SaveJson可以重构为：
bool SaveJson(string json)
{
return SaveText
(
json
, "Products.json"
, Environment.GetFolderPath (Environment.SpecialFolder.MyDocuments)
);
}
答案 1 :(得分：2)
编写和阅读文件非常简单：
string path = Environment.GetFolderPath(Environment.SpecialFolder.Personal);
string filename = Path.Combine(path, "myfile.txt");
using (var streamWriter = new StreamWriter(filename, true))
{
streamWriter.WriteLine(DateTime.UtcNow);
}
using (var streamReader = new StreamReader(filename))
{
string content = streamReader.ReadToEnd();
System.Diagnostics.Debug.WriteLine(content);
}