//几何对象绘制结束触发事件
private async void DrawCompleted(object sender, DrawEventArgs e)
{
//设置几何查询参数，FilterParameters、Geometry 和 SpatialQueryMode 为必设属性
QueryByGeometryParameters parameter = new QueryByGeometryParameters
{
FilterParameters = new List<FilterParameter>()
{
new FilterParameter()
{
Name = "Countries@World",
}
},
Geometry = e.Geometry,
SpatialQueryMode = SpatialQueryMode.INTERSECT,
//设置是返回查询结果资源（false）还是返回查询结果记录集（true）
ReturnContent = notHighlight
};
//与服务器交互
try
{
QueryByGeometryService service = new QueryByGeometryService(url);
var result = await service.ProcessAsync(parameter);
//无查询结果的情况
if (result == null)
{
await MessageBox.Show("查询结果为空！");
return;
}
//如果当前矢量图层中存在上一次的查询地物，则清除
if (flayer.Features.Count > 0)
{
flayer.Features.Clear();
}
highlayer.IsVisible = false;
highlayer.Refresh();
//当 ReturnContent = false 且有查询结果时，返回结果中的 ResourceInfo 不为空
//当 ReturnContent = true 且有查询结果时，返回结果中的 Recordsets 不为空，ResourceInfo 为空
if (result.ResourceInfo != null)
{
highlayer.IsVisible = true;
//获取高亮图片在服务器上存储的资源 ID 号
highlayer.QueryResultID = result.ResourceInfo.NewResourceID;
//设置服务端高亮图层的样式
highlayer.Style = new ServerStyle() { FillForeColor = new Color { R = 0, G = 160, B = 0 }, LineWidth = 0, FillOpaqueRate = 90 };
//该判断控制只加载一个高亮图层
if (!isAdded)
{
//刷新高亮图层
highlayer.Refresh();
this.MyMap.Layers.Add(highlayer);
isAdded = true;
}
}
else
{
//将查询结果记录集中的数据转换为矢量要素并在矢量图层中显示
foreach (Recordset recordset in result.Recordsets)
{
foreach (Feature f in recordset.Features)
{
flayer.Features.Add(f);
}
}
//将查询到的地物赋予 XMAL 中自定义样式
foreach (Feature item in flayer.Features)
{
if (item.Geometry is GeoLine)
{
item.Style = LineSelectStyle;
}
else if (item.Geometry is GeoRegion)
{
item.Style = SelectStyle;
}
else
{
item.Style = new PredefinedMarkerStyle() { Color = new SolidColorBrush(Colors.Blue), Size = 20, Symbol = PredefinedMarkerStyle.MarkerSymbol.Diamond };
}
}
}
}
//服务器查询失败
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
