3、讀取圖層
1: ...
2: /// <summary>
3: /// 顯示圖層
4: /// </summary>
5: protected void ShowLayers()
6: {
7: Thread.Sleep(500);
8: // 獲取所有圖層信息
9: FeatureCollectionGE layers = GeApp.GetLayersDatabases();
10: // 獲取工具面板
11: GEToolPad toolPad = GetToolPad();
12: // 顯示所有圖層
13: toolPad.ShowLayers(layers);
14: }
15: ...
16: /// <summary>
17: /// 將給定的圖層集合顯示在“圖層”選項卡的樹形控件中
18: /// </summary>
19: /// <param name="layers">圖層集合</param>
20: public void ShowLayers(FeatureCollectionGE layers)
21: {
22: if (this.InvokeRequired)
23: {
24: Action method = delegate {
25: InternalShowLayers(layers);
26: };
27: try
28: {
29: this.Invoke(method);
30: }
31: catch { }
32: }
33: else
34: {
35: InternalShowLayers(layers);
36: }
37: }
38: /// <summary>
39: /// 將給定的圖層集合顯示在“圖層”選項卡的樹形控件中.被公共函數ShowLayers調用
40: /// </summary>
41: /// <param name="layers"></param>
42: protected void InternalShowLayers(FeatureCollectionGE layers)
43: {
44: this.tvLayers.Nodes.Clear();
45:
46: if (layers == null || layers.Count <= 0)
47: {
48: return;
49: }
50:
51: foreach (FeatureGE layer in layers)
52: {
53: TreeNode node = new TreeNode(layer.Name);
54: node.Checked = layer.Visibility > 0;
55: node.Tag = layer;
56:
57: ShowChidrenLayers(layer, node);
58:
59: node.Expand();
60:
61: this.tvLayers.Nodes.Add(node);
62: }
63: }
64: /// <summary>
65: /// 顯示指定圖層的子圖層
66: /// </summary>
67: /// <param name="layer">當前圖層</param>
68: /// <param name="node">當前節點</param>
69: protected void ShowChidrenLayers(FeatureGE layer, TreeNode node)
70: {
71: FeatureCollectionGE layers = layer.GetChildren();
72:
73: foreach (FeatureGE child in layers)
74: {
75: TreeNode tn = new TreeNode(child.Name);
76: tn.Checked = child.Visibility > 0;
77: tn.Tag = child;
78:
79: ShowChidrenLayers(child, tn);
80:
81: node.Nodes.Add(tn);
82: }
83: }
