ArcGIS.Server.9.2.DotNet自带例子分析(一、二)
目的:
1.arcgis server9.2 ADF的无刷新机制。
准备:
1.(一、一)的工程,具体见前篇。
开始:
1. 先把上篇里漏下的ScaleBar(比例尺)和Magnifier(放大镜)功能补上,从工具栏拖一个ScaleBar和Magnifier控件到页面上ID分别为ScaleBar1和Magnifier1。
2.设置ScaleBar1,首先给esri:ScaleBar加上Style=" left: 278px; position: absolute; top: 485px; "这样做的目的就是可以使得ScaleBar1浮在地图上面,把页面切换到设计视图,选择ScaleBar1把它位置拖动到地图的右下角的位置,设置Map属性为Map1,设置BarUnits(单位)属性为Kilometers(千米), BarUnits有Miles(英里)、Kilometers(千米)、Feet(英尺)、Meters(米)四种选择,找了一下汉化单位的方法好像没有找到了,只能这样了。
3.设置Magnifier1,首先给esri:Magnifier加上style="position: absolute; left: 179px; top: 122px;"然后在设计视图中拖动到合适的位置,设置Map属性为Map1,MagnifierMapResource属性为MapResourceManager1,MagnifierMapResource属性为MapResourceItem0,MagnificationFactor属性设置默认放大倍数。
4.这样就完成了ScaleBar(比例尺)和Magnifier(放大镜)功能,可以调试运行一下查看效果。
5.开始功能代码,Default.aspx页面切换到代码视图,按照页生命周期顺序来说明代码。
6.首先添加ESRI.ArcGIS.ADF.Web.UI.WebControls的引用,输入页面的Page_PreInit方法,代码如下:
Code
1protected void Page_PreInit(object sender, EventArgs e)
2{
3 //找到页面中的OverviewMap_Panel控件
4 FloatingPanel ovPanel = Page.FindControl("OverviewMap_Panel") as FloatingPanel;
5if (ovPanel != null)
6{
7 OverviewMap ov = ovPanel.FindControl("OverviewMap1") as OverviewMap;
8 //如果OverviewMap1不为空OverviewMap_Panel的状态为展开状态
9if (ov != null)
10{
11 ov.Enabled = ovPanel.Expanded;
12}
13}
14}
7.Page_Load事件,首先去掉了一些比较复杂的代码从简单到复杂的分析,代码和说明如下:
Code
1//载入标识
2 public string m_newLoad = "false";
3
4 protected void Page_Load(object sender, EventArgs e)
5 {
6 if (!Page.IsCallback && !Page.IsPostBack)
7 {
8 //Map1控件的MapResourceManager检查
9 if (Map1.MapResourceManager == null || Map1.MapResourceManager.Length == 0)
10 {
11 //调用页面错误方法
12 callErrorPage("No MapResourceManager defined for the map.", null);
13 }
14 //MapResourceManager1控件的ResourceItems检查
15 if (MapResourceManager1.ResourceItems.Count == 0 || MapResourceManager1.ResourceItems[0] == null)
16 {
17 //调用页面错误方法
18 callErrorPage("The MapResourceManager does not have a valid ResouceItem Definition.", null);
19 }
20 //
21 m_newLoad = "true";
22 }
23
24 //获取OverviewMap_Panel控件
25 FloatingPanel ovPanel = Page.FindControl("OverviewMap_Panel") as FloatingPanel;
26 if (ovPanel != null)
27 {
28 //设置OverviewMap_Pane的关闭事件
29 ovPanel.PanelCollapsed += new ESRI.ArcGIS.ADF.Web.UI.WebControls.FloatingPanelCollapseEventHandler(OverviewMap_Panel_PanelCollapsed);
30 //设置OverviewMap_Pane的展开事件
31 ovPanel.PanelExpanded += new ESRI.ArcGIS.ADF.Web.UI.WebControls.FloatingPanelExpandEventHandler(OverviewMap_Panel_PanelExpanded);
32 }
33 }
34
35 //OverviewMap的展开事件
36 void OverviewMap_Panel_PanelExpanded(object sender, EventArgs args)
37 {
38 FloatingPanel ovPanel = Page.FindControl("OverviewMap_Panel") as FloatingPanel;
39 if (ovPanel != null)
40 {
41 OverviewMap ov = ovPanel.FindControl("OverviewMap1") as OverviewMap;
42 if (ov != null)
43 {
44 //激活OverviewMap1鹰眼
45 ov.Enabled = true;
46 //刷新鹰眼
47 ov.Refresh();
48
49 //进行回调登记
50 ovPanel.CallbackResults.CopyFrom(ov.CallbackResults);
51 }
52 }
53 }
54
55 //OverviewMap的关闭事件
56 void OverviewMap_Panel_PanelCollapsed(object sender, EventArgs args)
57 {
58 FloatingPanel ovPanel = Page.FindControl("OverviewMap_Panel") as FloatingPanel;
59 if (ovPanel != null)
60 {
61 OverviewMap ov = ovPanel.FindControl("OverviewMap1") as OverviewMap;
62 if (ov != null)
63 {
64 //不激活OverviewMap1鹰眼
65 ov.Enabled = false;
66 }
67 }
68 }
69
70 //发生错误是跳到ErrorPage.aspx页面
71 private void callErrorPage(string errorMessage, Exception exception)
72 {
73 //存储错误信息到Session
74 Session["ErrorMessage"] = errorMessage;
75 Session["Error"] = exception;
76
77 Page.Response.Redirect("ErrorPage.aspx", true);
78 }
8.接下来页面要实现 ICallbackEventHandler这个接口,关于 ICallbackEventHandler的资料网上很多了,通过实现 ICallbackEventHandler接口实现了NET中页面的无回调刷新。 实现 ICallbackEventHandler接口就必须实现string ICallbackEventHandler.GetCallbackResult()和void ICallbackEventHandler.RaiseCallbackEvent(string eventArgument)这2个方法具体代码和说明如下:
Code
1public partial class _Default : System.Web.UI.Page, ICallbackEventHandler
2.
3
4ICallbackEventHandler 成员#region ICallbackEventHandler 成员
5
6//负责把结果回传给客户端
7string ICallbackEventHandler.GetCallbackResult()
8{
9 throw new Exception("The method or operation is not implemented.");
10}
11
12//负责从客户端javascript传来的参数
13void ICallbackEventHandler.RaiseCallbackEvent(string eventArgument)
14{
15 throw new Exception("The method or operation is not implemented.");
16}
17
18#endregion
9.用ICallbackEventHandler的方式实现页面关闭和页面版权显示2个功能,首先添加m_closeOutCallback和m_copyrightCallback两个全局的字符串变量,这两字符串是生成客户端的javascript用的。然后在Page_Load事件添加生产这两字符内容的代码,具体代码如下:
Code
1//关闭javascript段
2public string m_closeOutCallback = "";
3//版权javascript段
4public string m_copyrightCallback = "";
5
6protected void Page_Load(object sender, EventArgs e)
7{
8
9
10 //通过GetCallbackEventReference生成客户端调用的javascript方法段
11 //GetCallbackEventReference (Control control,string argument,string clientCallback,string context)
12 //参数:
13 //control 处理客户端回调的服务器 Control。该控件必须实现 ICallbackEventHandler 接口并提供 RaiseCallbackEvent 方法。
14 //argument 从客户端脚本传递一个参数到服务器端的RaiseCallbackEvent 方法。
15 //clientCallback 一个客户端事件处理程序的名称,该处理程序接收服务器端事件返回的结果。
16 //context 启动回调之前在客户端的客户端脚本信息。脚本的结果传回给客户端事件处理程序。
17 m_closeOutCallback = Page.ClientScript.GetCallbackEventReference(Page, "argument", "CloseOutResponse", "context", true);
18 m_copyrightCallback = Page.ClientScript.GetCallbackEventReference(Page, "argument", "processCallbackResult", "context", true);
19
20}
10.把上面的m_closeOutCallback和m_copyrightCallback输出到页面,切换到Default.aspx的html代码页面在页面的结尾处输入如下代码:
Code
1
2</form>
3
4 <script language="javascript" type="text/javascript">
5 newLoad = <%=m_newLoad %>;
6 webMapAppCloseCallback = "<%=m_closeOutCallback %>";
7 webMapAppCopyrightCallback = "<%=m_copyrightCallback %>";
8 startUp();
9
10 </script>
11</body>
12</html>
11.新建JavaScript目录,然后在目录中新建叫WebMapApp.js的js文件,同时在Default.aspx页面用添加对WebMapApp.js文件的引用:<script language="javascript" type="text/javascript" src="javascript/WebMapApp.js"></script> 。WebMapApp.js代码如下:
Code
1//初始化方法
2function startUp()
3{
4 //暂空
5}
6
7//关闭页面方法
8function CloseOut() {
9 //向服务器端传递的参数
10 var argument = "ControlID=Map1&ControlType=Map&EventArg=CloseOutApplication";
11 var context = map.controlName;
12 //用eval执行webMapAppCloseCallback字符串,webMapAppCloseCallback = "WebForm_DoCallback('__Page',argument,CloseOutResponse,context,null,true)";
13 eval(webMapAppCloseCallback);
14}
15
16//在CloseOut()方法后接收服务器端事件返回的结果对页面进行响应
17function CloseOutResponse(response, context) {
18 window.close();
19 document.location = response;
20}
21
22function webMapAppGetCopyrightText() {
23 //向服务器端传递的参数
24 var argument = "ControlID=Map1&ControlType=Map&EventArg=GetCopyrightText";
25 var context = map.controlName;
26 //用eval执行webMapAppCopyrightCallback字符串,webMapAppCopyrightCallback = "WebForm_DoCallback('__Page',argument,processCallbackResult,context,null,true)";
27 eval(webMapAppCopyrightCallback);
28 //显示CopyrightText_Panel,arcgisServer的方法
29 showFloatingPanel('CopyrightText_Panel');
30}
31
12.上面的脚本文件中主要实现了CloseOut()和webMapAppGetCopyrightText()两客户端方法,他们是通过执行有服务器端GetCallbackEventReference生成客户端调用的javascript方法段实现无刷新的调用服务器端的方法。
13.接下来在服务器端编写响应上面这2个客户端方法的代码,这2个客户端方法都是通过WebForm_DoCallback与服务器端进行交互,所以需要在服务器端的ICallbackEventHandler.GetCallbackResult()和ICallbackEventHandler.RaiseCallbackEvent(string eventArgument)方法中进行处理,具体代码和说明如下:
Code
1ICallbackEventHandler 成员#region ICallbackEventHandler 成员
2
3 private string _callbackArg;
4 //负责把结果回传给客户端
5 string ICallbackEventHandler.GetCallbackResult()
6 {
7 return RaiseCallbackEvent(_callbackArg);
8 }
9
10 //负责从客户端javascript传来的参数
11 void ICallbackEventHandler.RaiseCallbackEvent(string eventArgument)
12 {
13 _callbackArg = eventArgument;
14 }
15
16 //对客户端的请求进行处理
17 public virtual string RaiseCallbackEvent(string responseString)
18 {
19 //对请求字符串进行分割以键值的形式放到NameValueCollection m_queryString中,方便接下来的使用
20 Array keyValuePairs = responseString.Split("&".ToCharArray());
21 NameValueCollection m_queryString = new NameValueCollection();
22 string[] keyValue;
23 string response = "";
24 if (keyValuePairs.Length > 0)
25 {
26 for (int i = 0; i < keyValuePairs.Length; i++)
27 {
28 keyValue = keyValuePairs.GetValue(i).ToString().Split("=".ToCharArray());
29 m_queryString.Add(keyValue[0], keyValue[1]);
30 }
31 }
32 else
33 {
34 keyValue = responseString.Split("=".ToCharArray());
35 if (keyValue.Length > 0)
36 {
37 m_queryString.Add(keyValue[0], keyValue[1]);
38 }
39 }
40
41 //请求字符串样例:ControlID=Map1&ControlType=Map&EventArg=CloseOutApplication,这样就可以很容易理解了
42 string controlType = m_queryString["ControlType"];
43 string eventArg = m_queryString["EventArg"];
44 if (controlType == null)
45 {
46 controlType = "Map";
47 }
48
49 //根据controlType的不同对请求做不同的处理
50 switch (controlType)
51 {
52 case "Map":
53 if (eventArg == "CloseOutApplication")//关闭页面请求-CloseOut()
54 {
55 //ServerContext对象,需要 ESRI.ArcGIS.Server;
56 IServerContext context;
57 for (int i = 0; i < Session.Count; i++)
58 {
59 //清除session
60 context = Session[i] as IServerContext;
61 if (context != null)
62 {
63 context.RemoveAll();
64 context.ReleaseContext();
65 }
66 }
67 Session.RemoveAll();
68 //从webconfig中获取关闭后的页面地址
69 response = ConfigurationManager.AppSettings["CloseOutUrl"];
70 if (response == null || response.Length == 0)
71 {
72 response = "ApplicationClosed.aspx";
73 }
74 }
75 else if (eventArg == "GetCopyrightText")//显示版权-webMapAppGetCopyrightText()
76 {
77 System.Text.StringBuilder sb = new System.Text.StringBuilder();
78 //webMapAppGetCopyrightText()请求服务器后返回结果由processCallbackResult进行客户端处理
79 //关于processCallbackResult方法的参数格式 控件类型:::控件ID:::内容类型:::内容,如div:::mydiv:::content:::你好,GIS!
80 sb.AppendFormat("///:::{0}:::innercontent:::", "CopyrightTextContents");
81 int sbLength = sb.Length;
82 //获取版权内容
83 sb.Append(GetCopyrightText());
84 if (sb.Length == sbLength)
85 {
86 //没有获取,显示为没有版权
87 sb.Append("No Copyright information available.");
88 }
89 response = sb.ToString();
90 }
91
92 break;
93 default:
94 break;
95 }
96 //输出给客户端的内容
97 return response;
98 }
99 #endregion
100
101 private string GetCopyrightText()
102 {
103 System.Text.StringBuilder sb = new System.Text.StringBuilder();
104 string key = "";
105 string value = "";
106 string dataframeValue = "";
107 int layerId;
108 foreach (IMapFunctionality mapFunc in Map1.GetFunctionalities())
109 {
110 //
111 if (mapFunc.Supports("GetCopyrightText"))
112 {
113 Dictionary<string, string> crDictionary = mapFunc.GetCopyrightText();
114 System.Text.StringBuilder sb2 = new System.Text.StringBuilder();
115 string[] layerIds = null;
116 string[] layerNames = null;
117 mapFunc.GetLayers(out layerIds, out layerNames);
118 foreach (KeyValuePair<string, string> kvPair in crDictionary)
119 {
120 key = kvPair.Key;
121 value = kvPair.Value;
122 if (value != null && value.Length > 0)
123 {
124 if (key != null && key.Length > 0)
125 {
126 layerId = Convert.ToInt32(key);
127 sb2.Append(layerNames[layerId] + ": ");
128 sb2.Append(value + "<br/>");
129 }
130 else
131 dataframeValue = value;
132 }
133 }
134 if (sb2.Length > 0) sb.AppendFormat("<div style='font-weight: bold'>{0}:</div><div style='padding: 0px 5px 5px 5px;font-weight: normal;'>{2}<br/>{1}</div>", mapFunc.Resource.Name, sb2.ToString(), dataframeValue);
135 sb2.Length = 0;
136 dataframeValue = "";
137 }
138 }
139 return sb.ToString();
140 }
14.现在在页面上添加一个FloatingPanel控件id为CopyrightText_Panel,在<esri:FloatingPanel标签中添加 Style="left: 540px; position: absolute; top: 145px",Visible属性为False,在这个FloatingPanel控件添加一个div id为CopyrightTextContents.代码如下:
Code
1<esri:FloatingPanel ID="CopyrightText_Panel" runat="server" BackColor="White" BorderColor="Gray"
2 BorderStyle="Solid" BorderWidth="1px" Font-Names="Verdana" Font-Size="8pt" ForeColor="Black"
3 Height="200px" Style="left: 491px; position: absolute; top: 387px"
4 Title="Copyright" TitleBarColor="WhiteSmoke" TitleBarHeight="20px"
5 TitleBarSeparatorLine="False" Transparency="35" Width="250px" Visible="False" Docked="False">
6 <div id="CopyrightTextContents" style=" 100%" >Copyright Information</div>
7 </esri:FloatingPanel>
15.新建ApplicationClosed.aspx页面,等关闭地图页面后显示的页面。
16.最好在页面上添加2个btton来调用CloseOut()和webMapAppGetCopyrightText()方法,具体代码如下:
Code
1<input id="Button1" type="button" value="关闭地图" onclick="CloseOut()" />
2 <input id="Button2" type="button" value="显示版权"onclick="webMapAppGetCopyrightText()"/>
17.最后调试运行看效果,剩下的部分下篇在写。
原文地址:https://www.cnblogs.com/hll2008/p/1264627.html