错误文档类型"是一个意外的标记。预期的令牌是"DOCTYPE"。第 1 行，位置 3。

大家好，我是使用谷歌api获取天气更新的新手。这个问题产生了一个错误。。我设置了doctype，但问题没有解决。。请帮我提前谢谢。。。

.aspx文件

<%@ Page Language="C#"  CodeBehind="WebForm1.aspx.cs" Inherits="WebApplication4.WebForm1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head id="Head1" runat="server">
    <title>Put Your Title Here</title>
    <style type="text/css">
        #Panel1
        {        
            width:350px;         
        }           
        #Panel1 img
        {
            float:left;
            width:100px;
            height:100px;
            margin-top:10px;
        }
        #Panel1 p
        {        
            float:right;
            margin-top:-10px;
            margin-right:0px;        
        }
        #Panel1 legend
        {        
            background-color:Green;
            color:White;
        }
    </style> 
</head>
<body>
    <form id="form1" runat="server">
        <h1 style="text-align:left">Using The Google Weather API</h1><br /> 
        <div style="text-align:left">
            <b>Enter Location (Postal Code or City): </b><asp:TextBox ID="txtLocation" Text="10007" runat="server"></asp:TextBox>
            <asp:Button ID="btnGo" runat="server" Text="GO" onclick="btnGo_Click" /><br /><br />
            <asp:Panel ID="Panel1" runat="server">
                <asp:Image ImageUrl="" runat="server" ID="icon" /> <br />
                <p>
                    Forecast for <b><asp:Label ID="lblLocation" runat="server"></asp:Label></b><br />
                    Current Condition: <b><asp:Label ID="currCondition" runat="server" Text=""></asp:Label></b><br />
                    <b><asp:Label ID="temp_f" runat="server" CssClass = "temp" Text=""></asp:Label></b>
                    <b><asp:Label ID="temp_c" runat="server" Text=""></asp:Label></b><br />
                    <b><asp:Label ID="humidity" runat="server" Text=""></asp:Label></b><br />
                    <b><asp:Label ID="wind_condition" runat="server" Text=""></asp:Label></b><br />
                    Forecast Date: <b><asp:Label ID="lblForecastDate" runat="server" Text=""></asp:Label></b><br />
                </p>
            </asp:Panel><br />
                <div>
                    <b><asp:Label id="wdcError" runat="server" Visible="false" CssClass="weatherError" ></asp:Label></b>
                </div>
        </div>
    </form>
<br/>       
</body>
</html>

.cs文件

  protected void btnGo_Click(object sender, EventArgs e)
        {
            // retrieve weather for the zip code entered by the user
            getWeatherData();
        }
        public void getWeatherData()
        {
            wdcError.Visible = false;
            // check for empty zip code field
            if (txtLocation.Text.Length == 0)
            {
                wdcError.Visible = true;
                wdcError.Text = "Please enter a location!";
                return;
            }
            // load xml result from Google weather
            XDocument xd = XDocument.Load("http://www.google.com/ig/api?weather=" + txtLocation.Text);
            // used to determine if a node is missing
            int cnt = 0;
            cnt = xd.Descendants("forecast_information").Count();
            // determine if forecast information was returned for the location entered by user
            if (cnt == 0)
            {
                wdcError.Visible = true;
                wdcError.Text = "Forecast Information NOT available for the location";
                return;
            }
            // navigate to the Current Conditions node
            var current_conditions = from currentCond in xd.Root.Descendants("current_conditions")
                                     select currentCond;
            // navigate to the Forecast Information node
            var forcastInfo = from forecastinfo in xd.Root.Descendants("forecast_information")
                              select forecastinfo;
            Panel1.GroupingText = "Today's Weather";
            // retrieve city and forecast date information
            foreach (var item in forcastInfo)
            {
                lblLocation.Text = item.Element("city").Attribute("data").Value;
                lblForecastDate.Text = item.Element("forecast_date").Attribute("data").Value;
            }
            // retrieve current weather conditions information
            foreach (var item in current_conditions)
            {
                currCondition.Text = item.Element("condition").Attribute("data").Value;
                temp_f.Text = item.Element("temp_f").Attribute("data").Value + "&deg;" + "F";
                temp_c.Text = "  (" + item.Element("temp_c").Attribute("data").Value + "&deg;" + "C" + ")";
                humidity.Text = item.Element("humidity").Attribute("data").Value;
                icon.ImageUrl = "http://www.google.com" + item.Element("icon").Attribute("data").Value;
                wind_condition.Text = item.Element("wind_condition").Attribute("data").Value;
            }
        }

如果你最喜欢的天气应用程序在上周左右突然停止工作，那么尝试刷新或重新安装它是没有意义的。谷歌已经关闭了天气API，但没有任何消息，依赖它为天气相关应用程序供电的开发人员陷入困境。我们剩下的是一堆坏掉的应用程序，它们可能会被修复，也可能不会被修复。

它不见了，我的朋友试试别的

你可以从这里得到

http://www.yr.no/

http://www.weathercase.net/

MSN天气API条件列表？

感谢

这是因为http://www.google.com/ig/api?weather=" + txtLocation.Text没有返回xml文件。该链接只是将您重定向到谷歌页面。

谷歌在之前的某个时候关闭了天气api。http://thenextweb.com/google/2012/08/28/did-google-just-quietly-kill-private-weather-api/

微软有一个天气API非常类似于谷歌的

查看此示例
http://weather.service.msn.com/data.aspx?weadegreetype=F&文化=en-US&weasearchstr=伊利诺伊州芝加哥

或者您可以使用Wunderground api

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