C#AE練習 （1）地圖、圖層加載及圖層的屬性訪問

地圖和圖層

窗體界面：

要求：
1、加載MapDocument，並獲取其包含的Map。
2、獲取當前選中Map所包含的Layer。
3、顯示選中Layer的屬性信息。

1.加載MapDocument，並獲取其包含的Map

public partial class Form1 : Form
{
	IMapDocument pMapDocument;  //全局變量 pMapDocument     
    public Form1()
    {         
    	InitializeComponent();
   	}              

//加載MapDocument，並獲取其包含的Map
private void LoadMxd_Click(object sender,EventArgs e)
{
	comboBox1.Items.Clear();
	
	OpenFileDialog pOpenFileDialog = new OpenFileDialog();
	pOpenFileDialog.Title = "打開地圖文檔";
	pOpenFileDialog.Filter = "地圖文檔(*.mxd)|*.mxd";
	pOpenFileDialog.RestoreDirectory = true;	
	if (pOpenFileDialog.ShowDialog() == DialogResult.OK) //檢查地圖文檔有效性
	{
		string MxdFilePath = pOpenFileDialog.FileName; //Mxd地圖文檔地址
		if (axMapControl1.CheckMxFile(MxdFilePath)) //判斷地址是否有效
		{
			axMapControl1.LoadMxFile(MxdFilePath,0,Type.Missing);
			
			pMapDocument = new MapDocumentClass();
			for (int i = 0; i < pMapDocument.MapCount; i++)
			{
				ComboBox1.Items.Add(axMapControl1.Map.Name);
			}
			axMapControl1.ActiveView.Refresh();
			axMapControl1.Extent = axMapControl1.FullExtent;			
		}
		else
		{
			MessageBox.Show("MxdFilePath" + "是無效的地圖文檔!", "信息提示");
			return;
		}		
	}
}

2.獲取當前選中Map所包含的Layer

private void comboBox1_SelectedIndexChanged(object sender,EventArgs e)
{
	listBox1.Items.Clear();

	int MapIndex = ComboBox1.SelectedIndex;	
	axMapControl1.Map = pMapDocument.get_Map(MapIndex);
	axMapControl1.ActiveView.Refresh();
	axMapControl1.Extent = axMapControl1.FullExtent;

	IMap pMap = axMapControl1.Map;
	for (int LayerIndex = 0; LayerIndex < pMap.LayerCount; LayerIndex++)
	{
		ILayer pLayer = pMap.get_Layer(LayerIndex);
		ListBox1.Items.Add(pLayer.Name);
	}			
}

3.顯示選中Layer的屬性信息

private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
	int i = listBox1.SelectedIndex;

	IMap pMap = axMapControl1.Map;
	ILayer pLayer = pMap.get_Layer(i);
	if (i < 0) return; //防止異常報錯，如果i爲-1，即沒選擇listBox1中的選項(一般此類空值，程序默認爲-1)

	bool ShowTips = pLayer.ShowTips;
	textBox1.Text = pLayer.MinimumScale.ToString();
	textBox2.Text = pLayer.MaximumScale.ToString();
	if (ShowTips.ToString() == "true")
		textBox3.Text = "Yes";
	else
		textBox3.Text = "No";
}

4.清除按鈕

private void Clear_Click(object sender, EventArgs e)
{
	axMapControl1.ClearLayers();
	axMapControl1.Refresh();

	comboBox1.Items.Clear();
	listBox1.Items.Clear();
	textBox1.Clear();
	textBox2.Clear();
	textBox3.Clear();
}

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參考文章：
https://blog.csdn.net/Domen_Dragon/article/details/86497799
https://blog.csdn.net/m0_37768631/article/details/84346403