Xamarin.Forms-webservices访问

虽然xamarin.android/ios 均支持右键添加web引用方式引用webservices，但是xamarin.forms不支持此方式，而如果android/ios各做一套采用抽象方式实现则工程巨大，且耦合性太强。故决定采用http方式请求webservices。

废话不说上干货：

Webservices 端改造
1. [System.Web.Script.Services.ScriptService]为支持jquery 或者其他 http 调用必须放开注释，如没有此特性将不能调用；
2. [ScriptMethod(ResponseFormat = ResponseFormat.Json)] webservices 默认返回xml格式为了增加 json格式返回增加此特性；
3. UseHttpGet = true 特别注意此点增加此特性则允许httpget访问，不增加则只允许post访问此为单向指定。
  建议如果指定需要参数传递的方法建议使用post方式如果使用get方式会各种报错如无效的json基元、参数'xx'缺少值。当然首先你要确认你的 jquery data 格式正确。
  
  测试代码如下：

using System;

using System.Collections;

using System.ComponentModel;

using System.Data;

using System.Web;

using System.Web.Services;

using System.Web.Services.Protocols;

using System.Web.Script.Services;

namespace NeuHuiju.APF.MES.WebUI

{

/// <summary>

/// WebService_wzc 的摘要说明

/// </summary>

[WebService(Namespace = "http://tempuri.org/")]

[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]

[ToolboxItem(false)]

[System.Web.Script.Services.ScriptService]

public class WebService_wzc : System.Web.Services.WebService

{

/// <summary>

/// 有参方法POST请求支持

/// </summary>

/// <param name="lan"></param>

/// <returns></returns>

[WebMethod]

[ScriptMethod(ResponseFormat = ResponseFormat.Json)]

public string HelloWorld(string lan)

{

if (lan != "")

return lan.ToString();

else

return "Hello World";

}

/// <summary>

/// 无参方法 GET请求支持

/// </summary>

/// <returns></returns>

[WebMethod]

[ScriptMethod(ResponseFormat = ResponseFormat.Json, UseHttpGet = true)]

public string World()

{

return "ceshi";

}

Web.config改造
<system.web>

</protocols>

</webServices>

增加webservices的请求支持。允许采用httpget、httppost方式

<system.webServer>

<add name="ScriptResource" verb="GET,HEAD" path="ScriptResource.axd" preCondition="integratedMode" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>

增加webservices的请求支持。此节点为System.Web.Script.Services.ScriptService提供支持如缺少会报错。大多数500错误均可以检查此节点是否添加。

要求iis采用集成模式，不能使用经典。（如果2.0）

Web端调试 jquery
为了便于测试新建html页面用于监控请求与返回。（为便于调试整理html代码用于测试，html必须与webservices同项目，否则会有跨域访问的问题。调试浪费精力。）

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<head>

</head>

<body>

function GetInfo() {

$.ajax({

url: "Webservice/MES/WebService_wzc.asmx/HelloWorld",

contentType: "application/json; charset=gb2312",

dataType: "json",

type: "POST",

data:"{lan:'"+$('#canshu').val()+"'}",

dataType: "json",

success: function (data) {

alert(data.d);

}

});

}

function GetWord() {

$.ajax({

url: "Webservice/MES/WebService_wzc.asmx/World",

contentType: "application/json; charset=gb2312",

dataType: "json",

type: "GET",

//data:"{lan:'"+$('#canshu')+"'}",

dataType: "json",

success: function (data) {

alert(data.d);

}

});

}

$('#ipt1').click(function () {

var res = GetInfo();

});

$('#Button1').click(function () {

var res = GetWord();

});

</script>

</body>

</html>

Webclient类

using BarCode;

using Newtonsoft.Json;

using System;

using System.Collections.Generic;

using System.Diagnostics;

using System.Linq;

using System.Net;

namespace BarCode.Droid

{

/// <summary>

/// webclient帮助类

/// </summary>

public class WebClient_clr : IWebClient_clr

{

public WebClient_clr()

{

}

/// <summary>

/// 根据参数集合拼凑json提交字符串

/// </summary>

/// <param name="datas"></param>

/// <returns></returns>

private string CreateDataJson(IDictionary<string, object> datas = null)

{

if (datas == null)

return string.Empty;

var namevalues = datas.Select(d =>

string.Format(@"""{0}"":{1}"

, d.Key

, d.Value.GetType().IsValueType

? string.Format(@"""{0}""", (d.Value??"").ToString())

: this.ObjectToJson(d.Value))

).ToArray();

return string.Format("{{{0}}}", string.Join(",", namevalues));

}

public T WebRequest<T>(Uri uri, IDictionary<string, object> datas = null, string method = "POST", string charset = "UTF8")

{

string data = this.CreateDataJson(datas);

using (WebClient webClient = new WebClient())

{

//webClient.Encoding = (Encoding)Enum.Parse(typeof(Encoding), charset);

webClient.Headers["Method"] = method.ToString();

webClient.Headers["Content-Type"] = string.Format(@"application/json;charset={0}", charset);

string dwstring;

if ("POST".Equals(method))

dwstring = webClient.UploadString(uri, method, data);

else

dwstring = webClient.DownloadString(uri);

return JsonConvert.DeserializeObject<T>(dwstring);

}

/// <summary>

/// 异步调用返回结果

/// </summary>

/// <typeparam name="T"></typeparam>

/// <param name="uri"></param>

/// <param name="datas"></param>

/// <param name="method"></param>

/// <param name="charset"></param>

/// <returns></returns>

public async System.Threading.Tasks.Task<T> WebRequestAsync<T>(Uri uri, IDictionary<string, object> datas = null, string method = "POST", string charset = "UTF8")

{

string data = this.CreateDataJson(datas);

using (WebClient webClient = new WebClient())

{

//webClient.Encoding = (Encoding)Enum.Parse(typeof(Encoding), charset);

webClient.Headers["Method"] = method.ToString();

webClient.Headers["Content-Type"] = string.Format(@"application/json;charset={0}", charset);

string dwstring;

if ("POST".Equals(method))

dwstring = await webClient.UploadStringTaskAsync(uri, method, data);

else

dwstring = await webClient.DownloadStringTaskAsync(uri);

return JsonConvert.DeserializeObject<T>(dwstring);

}

public void WebRequestCompleted<T>(Uri uri, IDictionary<string, object> datas = null, string method = "POST", string charset = "UTF8", Action<T> RunT = null)

{

string data = this.CreateDataJson(datas);

using (WebClient webClient = new WebClient())

{

//webClient.Encoding = (Encoding)Enum.Parse(typeof(Encoding), charset);

webClient.Headers["Method"] = method.ToString();

webClient.Headers["Content-Type"] = string.Format(@"application/json;charset={0}", charset);

if ("POST".Equals(method))

{

webClient.UploadStringCompleted += (sender, e) =>

{

var dwstring = e.Result;

if (RunT != null)

RunT(JsonConvert.DeserializeObject<T>(dwstring));

};

webClient.UploadStringAsync(uri, method, data);

}

else

{

webClient.DownloadStringCompleted += (sender, e) =>

{

var dwstring = e.Result;

if (RunT != null)

RunT(JsonConvert.DeserializeObject<T>(dwstring));

};

webClient.DownloadStringAsync(uri);

}

#region 字符串对象序列化--ObjectConvertJson

/// <summary>

/// 字符串对象序列化

/// </summary>

/// <param name="jsonstr"></param>

/// <returns></returns>

public T ObjectConvertJson<T>(string jsonstr)

{

try

{

if (string.IsNullOrEmpty(jsonstr) || jsonstr == "{}" || jsonstr == "Token String in state Start would result in an invalid JavaScript object.")

return default(T);

if (!typeof(T).Name.Equals("Object"))//不等于动态类型

return JsonConvert.DeserializeObject<T>(jsonstr);

return default(T);

}

catch (Exception ex)

{

Debug.Print(ex.Message);

throw new NotImplementedException(jsonstr + "\r\n+" + ex.Message);

}

#endregion

#region 对象序列化json-ObjectToJson

/// <summary>

/// ObjectToJson 对象序列化返回json

/// </summary>

/// <param name="obj"></param>

/// <returns></returns>

public string ObjectToJson(object obj)

{

return JsonConvert.SerializeObject(obj);

}

#endregion

}

调用
string turl = url + "/GetServiceDateTime";
string sss = CommCLR.webclient.WebRequest<string>(new Uri(turl), method: "GET");//url，get方式获取string

//post方式提交参数，key同web function 参数名

string sapurl = url + "/GetPOInforFromSAP";

IDictionary<string, object> datas = new Dictionary<string, object >();

datas.Add("plantNo", "1000");

datas.Add("poNo", "4500000060");

datas.Add("itemNo", new UserDto

{

Location = "11",

PlantNo = "1000"

});

var strss = CommCLR.webclient.WebRequest<string>(new Uri(sapurl), datas);

posted on 2016-03-14 09:32 吴占超的博客园阅读(2247) 评论(1) 编辑收藏举报

刷新页面返回顶部

一个程序员的自我修养

Xamarin.Forms-webservices访问

Webservices 端改造

Web.config改造

Web端调试 jquery

Webclient类

调用

导航

公告