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1.利用新浪提供给的iframe直接嵌入，这种方式非常的简单，但是却没有交互性。代码如下：

scrolling="no" width="246" height="360">

2.抓取当天的天气，以指定格式输出。

涉及的核心代码如下：

public static ArrayList GetWeather(string code)
{
/*
[0] "北京 "string
[1] "雷阵雨 "string
[2] "9℃" string
[3] "29℃"string
[4] "小于3级"string
*/
string html = "";
try
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://weather.sina.com.cn/iframe/weather/" + code + "_w.html ");
request.Method = "Get";
//request.Timeout   =   1;
request.ContentType = "application/x-www-form-urlencoded ";
WebResponse response = request.GetResponse();
Stream s = response.GetResponseStream();
StreamReader sr = new StreamReader(s, System.Text.Encoding.GetEncoding("GB2312"));
html = sr.ReadToEnd();
s.Close();
sr.Close();
}
catch (Exception err)
{
throw new Exception("访问地址出错~~~ ");
}

 这里涉及到一个ConvertCode类，它的作用是用于把城市转换为对应的全国统一的编码，代码如下：

using System;
using System.Collections.Generic;
using System.Web;


", thirdWindforceStartIndex);
string ThirdWindforce = Html.Substring(thirdWindforceStartIndex + 3, thirdWindforceEndIndex - thirdWindforceStartIndex - 3);

3.获取三天以内的天气，以指定格式输出。

核心代码如下：

public static ArrayList GetThreeDayWeather(string City)
{
ArrayList al = new ArrayList();
/*
[0] "今天 北京"              string
[1] "2009-04-17，星期五"     string
[2] "晴转多云"               string
[3] "12℃"                   string
[4] "25℃"                   string
[5] "2-3级"                  string
[6] "明天 北京"              string
[7] "2009-04-18，星期六"     string
[8] "阴转阵雨"               string
[9] "11℃"                   string
[10] "21℃"                  string
[11] "2-3级"                 string
[12] "后天 北京"             string
[13] "2009-04-19，星期日"    string
[14] "多云转阵雨"            string
[15] "9℃"                   string
[16] "20℃"                  string
[17] "2-3级"                 string         
*/
string Html = "";       //返回来的网页的源码
ASCIIEncoding encoding = new ASCIIEncoding();
string postData = string.Format("city=" + City);
byte[] data = encoding.GetBytes(postData);

try
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://php.weather.sina.com.cn/search.php?city=" + System.Web.HttpContext.Current.Server.UrlEncode(City) + "&f=1&dpc=1");
request.Method = "Get";
request.ContentType = "application/x-www-form-urlencoded ";
WebResponse response = request.GetResponse();
Stream s = response.GetResponseStream();
StreamReader sr = new StreamReader(s, System.Text.Encoding.GetEncoding("GB2312"));
Html = sr.ReadToEnd();
s.Close();
sr.Close();
}
catch (Exception err)
{
throw new Exception("访问地址出错~~~ ");
}

//去除多余代码，便于分析跟提高效率
int count = Html.Length;
int starIndex = Html.IndexOf("

", 0, count);
int endIndex = Html.IndexOf("

", 0);
Html = Html.Substring(starIndex, endIndex - starIndex);

try
{
#region 得到今天的天气

//得到今天的标识跟城市
int firstDayAndCityStartIndex = Html.IndexOf("

", 0);
int firstDayAndCityEndIndex = Html.IndexOf("

", 0);
string FirstDayAndCity = Html.Substring(firstDayAndCityStartIndex + 4, firstDayAndCityEndIndex - firstDayAndCityStartIndex - 4);

//得到今天的日期跟星期
int firstDateStartIndex = Html.IndexOf("

", firstDayAndCityEndIndex);
int firstDateEndIndex = Html.IndexOf("

", firstDayAndCityEndIndex);
string FirstDate = Html.Substring(firstDateStartIndex + 3, firstDateEndIndex - firstDateStartIndex - 3).Replace(" ", "，");

//得到今天的天气
int firstWeatherStartIndex = Html.IndexOf("

", firstDateEndIndex);
int firstWeatherEndIndex = Html.IndexOf(" ", firstWeatherStartIndex + 24);
string FirstWeather = Html.Substring(firstWeatherStartIndex + 24, firstWeatherEndIndex - firstWeatherStartIndex - 24);

//得到今天的温度

int firstTemperatureStartIndex = firstWeatherEndIndex + 1;
int firstTemperatureEndIndex = Html.IndexOf("

", firstTemperatureStartIndex);
string FirstTemperature = Html.Substring(firstTemperatureStartIndex, firstTemperatureEndIndex - firstTemperatureStartIndex);
int int1 = FirstTemperature.IndexOf("℃", 0);
int int2 = FirstTemperature.IndexOf("～", 0);
int int3 = FirstTemperature.IndexOf("℃", int2);
string FirstMinTemperature = FirstTemperature.Substring(int2 + 1, int3 - int2);
string FirstMaxTemperature = FirstTemperature.Substring(0, int2 - int1 + 2);

//得到今天的风力
int firstWindforceStartIndex = Html.IndexOf("风力：", firstTemperatureEndIndex);
int firstWindforceEndIndex = Html.IndexOf("

", firstWindforceStartIndex);
string FirstWindforce = Html.Substring(firstWindforceStartIndex + 3, firstWindforceEndIndex - firstWindforceStartIndex - 3);

if (FirstWindforce.Contains("至"))
{

}
else if (FirstWindforce.Contains("<"))                  //判断风力是否含有"<"或"≤"字样将,如果有的话，将其替换为2-
{
string strWindforce = FirstWindforce.Substring(1, FirstWindforce.Length - 2);
int minWindforce = Int32.Parse(strWindforce) - 1;
FirstWindforce = FirstWindforce.Replace("<", minWindforce.ToString() + "-");
}
else if (FirstWindforce.Contains("≤"))
{
string strWindforce = FirstWindforce.Substring(1, FirstWindforce.Length - 2);
int minWindforce = Int32.Parse(strWindforce) - 1;
FirstWindforce = FirstWindforce.Replace("≤", minWindforce.ToString() + "-");
}

#endregion

#region 得到明天的天气

//得到明天的标识跟城市
int secondDayAndCityStartIndex = Html.IndexOf("

", firstWindforceEndIndex);
int secondDayAndCityEndIndex = Html.IndexOf("

", secondDayAndCityStartIndex);
string secondDayAndCity = Html.Substring(secondDayAndCityStartIndex + 4, secondDayAndCityEndIndex - secondDayAndCityStartIndex - 4);

//得到明天的日期跟星期
int secondDateStartIndex = Html.IndexOf("

", secondDayAndCityEndIndex);
int secondDateEndIndex = Html.IndexOf("

", secondDateStartIndex);
string SecondDate = Html.Substring(secondDateStartIndex + 3, secondDateEndIndex - secondDateStartIndex - 3).Replace(" ", "，");

//得到明天的天气
int secondWeatherStartIndex = Html.IndexOf("

", secondDateEndIndex);
int secondWeatherEndIndex = Html.IndexOf(" ", secondWeatherStartIndex + 24);
string SecondWeather = Html.Substring(secondWeatherStartIndex + 24, secondWeatherEndIndex - secondWeatherStartIndex - 24);

//得到明天的温度

int secondTemperatureStartIndex = secondWeatherEndIndex + 1;
int secondTemperatureEndIndex = Html.IndexOf("

", secondTemperatureStartIndex);
string SecondTemperature = Html.Substring(secondTemperatureStartIndex, secondTemperatureEndIndex - secondTemperatureStartIndex);
int int4 = SecondTemperature.IndexOf("℃", 0);
int int5 = SecondTemperature.IndexOf("～", 0);
int int6 = SecondTemperature.IndexOf("℃", int2);
string SecondMinTemperature = SecondTemperature.Substring(int5 + 1, int6 - int5);
string SecondMaxTemperature = SecondTemperature.Substring(0, int5 - int4 + 2);

//得到明天的风力
int secondWindforceStartIndex = Html.IndexOf("风力：", secondTemperatureEndIndex);
int secondWindforceEndIndex = Html.IndexOf("

", secondWindforceStartIndex);
string SecondWindforce = Html.Substring(secondWindforceStartIndex + 3, secondWindforceEndIndex - secondWindforceStartIndex - 3);

if (SecondWindforce.Contains("至"))
{

}
else if (SecondWindforce.Contains("<"))                  //判断风力是否含有"<"或"≤"字样将,如果有的话，将其替换为2-
{
string strWindforce = SecondWindforce.Substring(1, FirstWindforce.Length - 2);
int minWindforce = Int32.Parse(strWindforce) - 1;
SecondWindforce = SecondWindforce.Replace("<", minWindforce.ToString() + "-");
}
else if (SecondWindforce.Contains("≤"))
{
string strWindforce = SecondWindforce.Substring(1, SecondWindforce.Length - 2);
int minWindforce = Int32.Parse(strWindforce) - 1;
SecondWindforce = SecondWindforce.Replace("≤", minWindforce.ToString() + "-");
}

#endregion

#region 得到后天的天气

//得到后天的标识跟城市
int thirdDayAndCityStartIndex = Html.IndexOf("

", secondWindforceEndIndex);
int thirdDayAndCityEndIndex = Html.IndexOf("

", thirdDayAndCityStartIndex);
string thirdDayAndCity = Html.Substring(thirdDayAndCityStartIndex + 4, thirdDayAndCityEndIndex - thirdDayAndCityStartIndex - 4);

//得到后天的日期跟星期
int thirdDateStartIndex = Html.IndexOf("

", thirdDayAndCityEndIndex);
int thirdDateEndIndex = Html.IndexOf("

", thirdDateStartIndex);
string ThirdDate = Html.Substring(thirdDateStartIndex + 3, thirdDateEndIndex - thirdDateStartIndex - 3).Replace(" ", "，");

//得到后天的天气
int thirdWeatherStartIndex = Html.IndexOf("

", thirdDateEndIndex);
int thirdWeatherEndIndex = Html.IndexOf(" ", thirdWeatherStartIndex + 24);
string ThirdWeather = Html.Substring(thirdWeatherStartIndex + 24, thirdWeatherEndIndex - thirdWeatherStartIndex - 24);

//得到后天的温度

int thirdTemperatureStartIndex = thirdWeatherEndIndex + 1;
int thirdTemperatureEndIndex = Html.IndexOf("

", thirdTemperatureStartIndex);
string ThirdTemperature = Html.Substring(thirdTemperatureStartIndex, thirdTemperatureEndIndex - thirdTemperatureStartIndex);
int int7 = ThirdTemperature.IndexOf("℃", 0);
int int8 = ThirdTemperature.IndexOf("～", 0);
int int9 = ThirdTemperature.IndexOf("℃", int2);
string ThirdMinTemperature = ThirdTemperature.Substring(int8 + 1, int9 - int8);
string ThirdMaxTemperature = ThirdTemperature.Substring(0, int8 - int7 + 2);

//得到后天的风力
int thirdWindforceStartIndex = Html.IndexOf("风力：", thirdTemperatureEndIndex);
int thirdWindforceEndIndex = Html.IndexOf("

特殊说明，使用第三种方法获取天气预报，输入城市的时候可能会受新浪提供的服务的影响，可能有些城市搜不到，前两种方法应该是不会受影响的。另外，由于代码写的比较急，所以难免代码的质量就会有些问题，还请大家多多包涵。单纯从代码上看，可能确实没有什么难度，可是如果在您的工作中如果因为我的代码为您节省了一些时间，笔者深感欣慰了。

另外，由于我的开发环境是VS2008+sp1，如果您的vs版本较低，不妨把项目文件删除掉，然后打开您的VS，选择打开网站，然后定位到本程序的目录，这样就可以进行代码的编译跟踪调试了。

再补充一点，有人可能对代码中出现的：System.Environment.NewLine 这句代码比较迷糊，因为这个是.NET提供的简单的换行方法，我推荐大家以后能够使用这种.net提供给大家的高效、简便的方法。最关键的是它不容易出错。

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