ArcGIS.Server.9.2.DotNet自带例子分析（三、一）

目的：
1.arcgis server9.2 ADF的AddGraphics。
准备工作：
1.用ArcGis Server Manager或者ArcCatalog发布一个叫world的Map Service,并且把这个Service启动起来。
2.找到DeveloperKit\SamplesNET\Server\Web_Applications目录下的Common_AddGraphicsCSharp.zip。

开始：
1.新建名为AddGraphics的ASP.NET Web应用程序。
2.在页面上放置1个Map、1个Toc、1个MapResourceManager、1个Toolbar控件，做好相应的设置比较简单也不详细说了，也可以参考前面的几篇文章。
3.主要说一下MapResourceManager1设置了，这次与前几篇不同了用的是ArcGIS Server Internet，用编辑器添加以一个名为ServerResource的MapResourceItem，然后点击Definition属性做如下设置，Type:ArcGIS Server Internet;Data Source:http://机器名/arcgis/services；Identity:输入机器的账号和密码；Resource:(default)@world。
4.在Toolbar1添加一个Tool,Name:AddPointTool;Text:Add Graphic Point;ClientAction:Point;ServerActionAssembly:AddGraphics;ServerActionClass:AddGraphics.ElementGraphicTool。
5.新建GraphicPointTools.cs文件，然后在文件中添加ElementGraphicTool类用来实现AddPointTool的功能，代码和说明如下：

public class ElementGraphicTool : IMapServerToolAction
2

{
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void IMapServerToolAction.ServerAction(ToolEventArgs toolEventArgs)
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{
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//获取map控件
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ESRI.ArcGIS.ADF.Web.UI.WebControls.Map adfMap =(ESRI.ArcGIS.ADF.Web.UI.WebControls.Map)toolEventArgs.Control;
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//转成点
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PointEventArgs pointEventArgs = (PointEventArgs)toolEventArgs;
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//屏幕点
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System.Drawing.Point screenPoint = pointEventArgs.ScreenPoint;
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//屏幕坐标转成地理坐标
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ESRI.ArcGIS.ADF.Web.Geometry.Point adfPoint =ESRI.ArcGIS.ADF.Web.Geometry.Point.ToMapPoint(screenPoint.X, screenPoint.Y, adfMap.GetTransformationParams(ESRI.ArcGIS.ADF.Web.Geometry.TransformationDirection.ToMap));
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ESRI.ArcGIS.ADF.Web.DataSources.Graphics.MapFunctionality adfGraphicsMapFunctionality = null;
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//MapFunctionality
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foreach (ESRI.ArcGIS.ADF.Web.DataSources.IMapFunctionality mapFunctionality in adfMap.GetFunctionalities())
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{
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//当Resource为ADFGraphicsResource,ADFGraphicsResource为GraphicsLayer，保存在内存中用显示临时图层
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if (mapFunctionality.Resource.Name == "ADFGraphicsResource")
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{
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adfGraphicsMapFunctionality =(ESRI.ArcGIS.ADF.Web.DataSources.Graphics.MapFunctionality)mapFunctionality;
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break;
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}
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}
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//当为null的时候调用Utility.ProcessError方法弹出提示框
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if (adfGraphicsMapFunctionality == null)
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{
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//把Utility.ProcessError处理的CallbackResultCollection结果赋给Map控件
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adfMap.CallbackResults.CopyFrom(Utility.ProcessError("ADF graphics functionality not found"));
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return;
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}
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//从adfGraphicsMapFunctionality获取名为Element Graphics的DataTable
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ESRI.ArcGIS.ADF.Web.Display.Graphics.ElementGraphicsLayer elementGraphicsLayer = null;
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foreach (System.Data.DataTable dataTable in adfGraphicsMapFunctionality.GraphicsDataSet.Tables)
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{
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if (dataTable.TableName == "Element Graphics")
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{
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elementGraphicsLayer = (ESRI.ArcGIS.ADF.Web.Display.Graphics.ElementGraphicsLayer)dataTable;
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break;
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}
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}
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//如果名为Element Graphics的DataTable为null，就新建Element Graphics DataTable添加到adfGraphicsMapFunctionality.GraphicsDataSet中,同时刷新Toc1显示
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if (elementGraphicsLayer == null)
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{
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elementGraphicsLayer = new ESRI.ArcGIS.ADF.Web.Display.Graphics.ElementGraphicsLayer();
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elementGraphicsLayer.TableName = "Element Graphics";
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adfGraphicsMapFunctionality.GraphicsDataSet.Tables.Add(elementGraphicsLayer);
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//查找Toc1控件
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Toc adfToc = (Toc)Utility.FindControl("Toc1", adfMap.Page);
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//刷新Toc1控件
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adfToc.Refresh();
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//CallbackResults结果赋给Map控件
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adfMap.CallbackResults.CopyFrom(adfToc.CallbackResults);
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}
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//定义标点样式
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ESRI.ArcGIS.ADF.Web.Display.Symbol.SimpleMarkerSymbol simpleMarkerSymbol =new ESRI.ArcGIS.ADF.Web.Display.Symbol.SimpleMarkerSymbol();
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simpleMarkerSymbol.Color = System.Drawing.Color.Black;
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simpleMarkerSymbol.Width = 10;
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//定义标点选中样式
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ESRI.ArcGIS.ADF.Web.Display.Symbol.SimpleMarkerSymbol simpleSelectedMarkerSymbol =new ESRI.ArcGIS.ADF.Web.Display.Symbol.SimpleMarkerSymbol();
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simpleSelectedMarkerSymbol.Color = System.Drawing.Color.Yellow;
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simpleSelectedMarkerSymbol.Width = 12;
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simpleSelectedMarkerSymbol.Type = ESRI.ArcGIS.ADF.Web.Display.Symbol.MarkerSymbolType.Star;
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ESRI.ArcGIS.ADF.Web.Display.Graphics.GraphicElement graphicElement =new ESRI.ArcGIS.ADF.Web.Display.Graphics.GraphicElement(adfPoint, simpleMarkerSymbol, simpleSelectedMarkerSymbol);
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//把标点添加到elementGraphicsLayer
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elementGraphicsLayer.Add(graphicElement);
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//刷新显示
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if (adfMap.ImageBlendingMode == ImageBlendingMode.WebTier)
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{
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//整个地图控件刷新
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adfMap.Refresh();
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}
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else
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{
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//只刷新部分Resource
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adfMap.RefreshResource(adfGraphicsMapFunctionality.Resource.Name);
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}
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}
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}

6.新建Utility.cs文件，然后添加上面的ElementGraphicTool类中用到的ProcessError和FindControl方法，具体代码和说明如下：

namespace AddGraphics
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{
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public class Utility
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{
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//错误信息处理
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public static ESRI.ArcGIS.ADF.Web.UI.WebControls.CallbackResultCollection ProcessError(string message)
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{
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//alert错误信息
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string jsAlertException = "alert('" + message + "')";
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//用CallbackResult执行js脚本
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ESRI.ArcGIS.ADF.Web.UI.WebControls.CallbackResult alertCallbackResult =new ESRI.ArcGIS.ADF.Web.UI.WebControls.CallbackResult(null, null, "javascript", jsAlertException);
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//设置鼠标的指针显示
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string jsChangeCursor = "map.divObject.style.cursor = map.cursor";
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//用CallbackResult执行js脚本
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ESRI.ArcGIS.ADF.Web.UI.WebControls.CallbackResult cursorCallbackResult =new ESRI.ArcGIS.ADF.Web.UI.WebControls.CallbackResult(null, null, "javascript", jsChangeCursor);
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ESRI.ArcGIS.ADF.Web.UI.WebControls.CallbackResultCollection callbackResultCollection =new ESRI.ArcGIS.ADF.Web.UI.WebControls.CallbackResultCollection();
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callbackResultCollection.Add(alertCallbackResult);
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callbackResultCollection.Add(cursorCallbackResult);
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//返回CallbackResultCollection
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return callbackResultCollection;
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}
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//查找页面控件
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public static Control FindControl(string control, Page page)
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{
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if (page == null || control == null)
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{
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return null;
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}
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Control buddyControl = page.FindControl(control);
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if (buddyControl == null)
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{
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string webPartControl = GetControlUniqueID(control, page.Controls);
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if (webPartControl != null)
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{
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buddyControl = page.FindControl(webPartControl);
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}
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else
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{
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buddyControl = page.FindControl(control);
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}
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}
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return buddyControl;
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}
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public static string GetControlUniqueID(string controlID, ControlCollection controls)
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{
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Control control;
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string uniqueID = null;
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for (int i = 0; i < controls.Count; ++i)
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{
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control = controls[i];
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if (control.ID == controlID)
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{
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uniqueID = control.UniqueID;
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break;
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}
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if (control.Controls.Count > 0)
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{
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uniqueID = GetControlUniqueID(controlID, control.Controls);
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if (uniqueID != null)
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break;
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}
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}
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return uniqueID;
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}
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}
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}
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7.这样就完成了AddGraphics的功能可以运行查看一下效果。这个例子剩下的部分下篇继续写。