C#AE （1）地图、图层加载及图层的属性访问

地图和图层

窗体界面：

要求：
1、加载MapDocument，并获取其包含的Map。
2、获取当前选中Map所包含的Layer。
3、显示选中Layer的属性信息。

1.加载MapDocument，并获取其包含的Map

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

//加载MapDocument，并获取其包含的Map
private void LoadMxd_Click(object sender,EventArgs e)
{
	comboBox1.Items.Clear();
	
	OpenFileDialog pOpenFileDialog = new OpenFileDialog();
	pOpenFileDialog.Title = "打开地图文档";
	pOpenFileDialog.Filter = "地图文档(*.mxd)|*.mxd";
	pOpenFileDialog.RestoreDirectory = true;	
	if (pOpenFileDialog.ShowDialog() == DialogResult.OK) //检查地图文档有效性
	{
		string MxdFilePath = pOpenFileDialog.FileName; //Mxd地图文档地址
		if (axMapControl1.CheckMxFile(MxdFilePath)) //判断地址是否有效
		{
			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" + "是无效的地图文档!", "信息提示");
			return;
		}		
	}
}

2.获取当前选中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.显示选中Layer的属性信息

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; //防止异常报错，如果i为-1，即没选择listBox1中的选项(一般此类空值，程序默认为-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.清除按钮

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