我怎样才能解开Compact Framework的客户端上的自定义类型的返回泛型列表？ [英] How can I unpack a returned generic list of a custom type on the Compact Framework client?
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问题描述
我有一个从本地到它的MS Access表，并存储值到一个通用的列表，并传递回读的Web API服务器上的REST方法：
公开名单＆LT;＆Sitemap产生GT; GetSiteMappings（字符串userid，字符串PWD）
{
清单＆LT;＆Sitemap产生GT; siteMappings =新的List＆LT;＆Sitemap产生GT;（）;
串connStr =
的String.format（
@供应商= Microsoft.ACE.OLEDB.12.0;用户ID = {0};密码= {1};数据
来源= C：\\ CDBWin \\ DATA \\ CDBSetup.MDB;喷射OLEDB：系统数据库= C：\\ CDBWin \\ DATA \\ sscs.mdw，用户ID
PWD）;
使用（VAR康恩=新的OleDbConnection（connStr））
{
使用（OleDbCommand的CMD = conn.CreateCommand（））
{
cmd.CommandText =SELECT site_no，location_num从site_no t_sites秩序;
cmd.CommandType = CommandType.Text;
conn.Open（）;
使用（OleDbDataReader oleDbD8aReader = cmd.ExecuteReader（））
{
而（oleDbD8aReader = NULL＆放大器;！＆安培; oleDbD8aReader.Read（））
{
INT siteNum = oleDbD8aReader [SiteNumber]是的DBNull
？ 0
：Convert.ToInt16（oleDbD8aReader [SiteNumber]）;
字符串locationNum = oleDbD8aReader [location_num]是的DBNull
？的String.Empty
：oleDbD8aReader [location_num]的ToString（）;
siteMappings.Add（新Sitemap产生{SiteNumber = siteNum，LocationNumber =
locationNum}）;
}
}
}
}
返回siteMappings;
}公共类第三方Sitemap
{
公众诠释SiteNumber {搞定;组; }
公共字符串LocationNumber {搞定;组; }
公共字符串网站名称{搞定;组; }
}
我把它从客户端（Windows CE的/ Compact Framework的），像这样：
公开的ArrayList FetchSiteMappings（字符串URL）
{
HttpWebRequest的httpwreq = SendHTT prequestNoCredentials（URL，HttpMethods.GET，的String.Empty，应用程序/ XML）;
//从http://stackoverflow.com/questions/12350670/how-to-extract-zipped-file-received-from-httpwebresponse理念
变种响应= httpwreq.GetResponse（）;
变种responseStream = response.GetResponseStream（）;
responseStream。 ＆LT; =我卡在这里
}
...但我不知道如何处理响应流做 - 我如何把什么传递从一个普通的列表返回一个ArrayList
？这里的 SendHTT prequestNoCredentials（）的方法，如果任何人的兴趣（或者即使他们没有）：
公共静态的HttpWebRequest SendHTT prequestNoCredentials（字符串URI，HttpMethods方法，字符串数据，字符串的contentType）
{
WebRequest的请求= NULL;
尝试
{
请求= WebRequest.Create（URI）;
request.Method = Enum.ToObject（typeof运算（HttpMethods），法）的ToString（）;
request.ContentType的contentType =;
（（HttpWebRequest的）要求）。接受的contentType =;
（（HttpWebRequest的）要求）.KeepAlive = FALSE;
（（HttpWebRequest的）要求）.ProtocolVersion = HttpVersion.Version10; 如果（方法= HttpMethods.GET和放大器;！＆安培;！方法= HttpMethods.DELETE）
{
字节[] = arrData Encoding.UTF8.GetBytes（数据）;
request.ContentLength = arrData.Length;
使用（流OS = request.GetRequestStream（））
{
oS.Write（arrData，0，arrData.Length）;
}
}
其他
{
request.ContentLength = 0;
}
}
赶上（异常前）
{
字符串msgInnerExAndStackTrace =的String.Format（
{0};内蒙古例如：{1};堆栈跟踪：{2}，ex.Message，ex.InnerException，
ex.StackTrace）;
ExceptionLoggingService.Instance.WriteLog（的String.Format（从
FileXferREST.SendHTT prequestNoCredentials（）{0}，msgInnerExAndStackTrace））;
}
返回的请求为HttpWebRequest的;
}
更新
我已经改变了SendHTT prequestNoCredentials（）方法返回，而不是一个一个的HttpWebRequest HttpWebResponse（见<一href=\"http://stackoverflow.com/questions/27804430/is-there-something-missing-from-this-borrowed-adapted-$c$c-or-am-i-not-seeing\">Is有什么从此却下落不明（借用/改编）code，还是我没有看到其中获取被炒鱿鱼？在更新那里（最小）的详细信息），所以FetchSiteMappings（）方法也改变;现在是：
HttpWebResponse httpwresp = SendHTT prequestNoCredentials（URL，HttpMethods.GET，的String.Empty，应用程序/ XML）;
httpwresp。 ＆LT;如今=什么？
解决方案
看来，这应该工作：
公开的ArrayList FetchSiteQuery（字符串URL）
{
清单＆LT;串GT; LS =新的List＆LT;串GT;（）;
字节[] buf中=新的字节[8192];
字符串tempString = NULL;
诠释计数= 0;
//从http://stackoverflow.com/questions/12350670/how-to-extract-zipped-file-理念
接收来自-httpwebresponse
HttpWebResponse httpwresp = SendHTT prequestNoCredentials（URL，HttpMethods.GET，
的String.Empty，应用程序/ XML）;
变种responseStream = httpwresp.GetResponseStream（）;
//改编自http://www.csharp-station.com/HowTo/HttpWebFetch.aspx以下
做
{
//填充数据的缓冲区
数= responseStream.Read（BUF，0，buf.Length）; //确保我们读一些数据
如果（计数！= 0）
{
//从字节ASCII文本翻译
tempString = Encoding.ASCII.GetString（BUF，0，计数）; //继续生成字符串
ls.Add（tempString）;
}
}
而（计数大于0）; //更多的数据看？
ArrayList的myArrayList =新的ArrayList（）;
myArrayList.AddRange（LS）;
返回myArrayList;
}
更新
是的，它的工作;本次测试code：
私人无效button56_Click（对象发件人，EventArgs的发送）
{
ArrayList的人= FetchSiteQuery（HTTP：//本地主机：21608 / API / sitequery / GETALL / dbill / PPU的/ 3）;
的foreach（一个String的人）
{
MessageBox.Show（多个）;
}
}
...给我这样的：
...还有几个后页面（消息框实例）。
I have a REST method on the Web API server that reads from a local-to-it MS Access table, and stores the values into a generic list, and passes that back:
public List<SiteMapping> GetSiteMappings(String userId, String pwd)
{
List<SiteMapping> siteMappings = new List<SiteMapping>();
string connStr =
string.Format(
@"Provider=Microsoft.ACE.OLEDB.12.0;User ID={0};Password={1};Data
Source=C:\CDBWin\DATA\CDBSetup.MDB;Jet OLEDB:System database=C:\CDBWin\Data\sscs.mdw", userId,
pwd);
using (var conn = new OleDbConnection(connStr))
{
using (OleDbCommand cmd = conn.CreateCommand())
{
cmd.CommandText = "SELECT site_no, location_num FROM t_sites order by site_no";
cmd.CommandType = CommandType.Text;
conn.Open();
using (OleDbDataReader oleDbD8aReader = cmd.ExecuteReader())
{
while (oleDbD8aReader != null && oleDbD8aReader.Read())
{
int siteNum = oleDbD8aReader["SiteNumber"] is DBNull
? 0
: Convert.ToInt16(oleDbD8aReader["SiteNumber"]);
string locationNum = oleDbD8aReader["location_num"] is DBNull
? string.Empty
: oleDbD8aReader["location_num"].ToString();
siteMappings.Add(new SiteMapping { SiteNumber = siteNum, LocationNumber =
locationNum });
}
}
}
}
return siteMappings;
}
public class SiteMapping
{
public int SiteNumber { get; set; }
public string LocationNumber { get; set; }
public string SiteName { get; set; }
}
I call it from the client (Windows CE / Compact Framework) like so:
public ArrayList FetchSiteMappings(string url)
{
HttpWebRequest httpwreq = SendHTTPRequestNoCredentials(url, HttpMethods.GET, String.Empty, "application/xml");
// Idea from http://stackoverflow.com/questions/12350670/how-to-extract-zipped-file-received-from-httpwebresponse
var response = httpwreq.GetResponse();
var responseStream = response.GetResponseStream();
responseStream. <= I'm stuck here
}
...but I don't know what to do with the response stream -- How do I convert what is passed back from a generic list to an ArrayList?
Here's the SendHTTPRequestNoCredentials() method, in case anybody's interested (or even if they're not):
public static HttpWebRequest SendHTTPRequestNoCredentials(string uri, HttpMethods method, string data, string contentType)
{
WebRequest request = null;
try
{
request = WebRequest.Create(uri);
request.Method = Enum.ToObject(typeof(HttpMethods), method).ToString();
request.ContentType = contentType;
((HttpWebRequest)request).Accept = contentType;
((HttpWebRequest)request).KeepAlive = false;
((HttpWebRequest)request).ProtocolVersion = HttpVersion.Version10;
if (method != HttpMethods.GET && method != HttpMethods.DELETE)
{
byte[] arrData = Encoding.UTF8.GetBytes(data);
request.ContentLength = arrData.Length;
using (Stream oS = request.GetRequestStream())
{
oS.Write(arrData, 0, arrData.Length);
}
}
else
{
request.ContentLength = 0;
}
}
catch (Exception ex)
{
String msgInnerExAndStackTrace = String.Format(
"{0}; Inner Ex: {1}; Stack Trace: {2}", ex.Message, ex.InnerException,
ex.StackTrace);
ExceptionLoggingService.Instance.WriteLog(String.Format("From
FileXferREST.SendHTTPRequestNoCredentials(): {0}", msgInnerExAndStackTrace));
}
return request as HttpWebRequest;
}
UPDATE
I've changed the SendHTTPRequestNoCredentials() method to return a HttpWebResponse instead of a HttpWebRequest (see Is there something missing from this (borrowed/adapted) code, or am I not seeing where a Get gets fired? for the (minimal) details in the Update there), so the FetchSiteMappings() method has also changed; it is now:
HttpWebResponse httpwresp = SendHTTPRequestNoCredentials(url, HttpMethods.GET, String.Empty, "application/xml");
httpwresp. <= what now???
解决方案
It seems that this should work:
public ArrayList FetchSiteQuery(string url)
{
List<String> ls = new List<string>();
byte[] buf = new byte[8192];
string tempString = null;
int count = 0;
// Idea from http://stackoverflow.com/questions/12350670/how-to-extract-zipped-file-
received-from-httpwebresponse
HttpWebResponse httpwresp = SendHTTPRequestNoCredentials(url, HttpMethods.GET,
String.Empty, "application/xml");
var responseStream = httpwresp.GetResponseStream();
// adapted the following from http://www.csharp-station.com/HowTo/HttpWebFetch.aspx
do
{
// fill the buffer with data
count = responseStream.Read(buf, 0, buf.Length);
// make sure we read some data
if (count != 0)
{
// translate from bytes to ASCII text
tempString = Encoding.ASCII.GetString(buf, 0, count);
// continue building the string
ls.Add(tempString);
}
}
while (count > 0); // any more data to read?
ArrayList myArrayList = new ArrayList();
myArrayList.AddRange(ls);
return myArrayList;
}
UPDATE
Yes, it did work; this test code:
private void button56_Click(object sender, EventArgs e)
{
ArrayList al = FetchSiteQuery("http://localhost:21608/api/sitequery/getall/dbill/ppus/3");
foreach (String s in al)
{
MessageBox.Show(s);
}
}
...showed me this:
...and several more "pages" (message box instantiations) after that.
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