这里主要是访问并显示shapefile的属性表~
大致思路如下:新建一个Form用来获取选中要素的属性表,而在初始界面右键点击对应的矢量要素后,便打开新form将要素属性表展示出来。
下面就开始咯~
首先要添加ESRI.ArcGIS.Controls、Geodatabase的引用,更新命名空间;
然后我们添加一个用于显示属性表内容新的 Form 窗体,在这个新的窗体上添加 dataGridView 控件,并添加Column。
在Form2中,我们先将可能获得的属性表数据类型进行预定义:
public static string ParseFieldType(esriFieldType fieldType)//将EsriType 转换为String
{
switch (fieldType)
{
case esriFieldType.esriFieldTypeBlob:
return "System.String";
case esriFieldType.esriFieldTypeDate:
return "System.DateTime";
case esriFieldType.esriFieldTypeDouble:
return "System.Double";
case esriFieldType.esriFieldTypeGeometry:
return "System.String";
case esriFieldType.esriFieldTypeGlobalID:
return "System.String";
case esriFieldType.esriFieldTypeGUID:
return "System.String";
case esriFieldType.esriFieldTypeInteger:
return "System.Int32";
case esriFieldType.esriFieldTypeOID:
return "System.String";
case esriFieldType.esriFieldTypeRaster:
return "System.String";
case esriFieldType.esriFieldTypeSingle:
return "System.Single";
case esriFieldType.esriFieldTypeSmallInteger:
return "System.Int32";
case esriFieldType.esriFieldTypeString:
return "System.String";
default:
return "System.String";
}
}
然后就是获取shpaefile的属性表了,这里我们主要使用 IField、IFeatureCursor、IFeature 这三个接口来达成目标:
接口说明如下:
IField 接口:用于获取要素表。
IFeature 接口:用来接收查询出来的要素。
IFeatureCursor 接口:通过Search进行查询,可以将结果保存在这里,从而利用NextFeature方法,遍历所有要素。
代码如下:
public void Opentable()
{
IFields pFields;
pFields = pFeaturelayer.FeatureClass.Fields;
dataGridView1.ColumnCount = pFields.FieldCount;
for (int i = 0; i < pFields.FieldCount; i++)
{
string fldName = pFields.get_Field(i).Name;
dataGridView1.Columns[i].Name = fldName;
dataGridView1.Columns[i].ValueType = System.Type.GetType(ParseFieldType(pFields.get_Field(i).Type));
}
IFeatureCursor pFeatureCursor;
pFeatureCursor = pFeaturelayer.FeatureClass.Search(null, false);
IFeature pFeature;
pFeature = pFeatureCursor.NextFeature();
while (pFeature != null)
{
string[] fldValue = new string[pFields.FieldCount];
for (int i = 0; i < pFields.FieldCount; i++)
{
string fldName;
fldName = pFields.get_Field(i).Name;
if (fldName == pFeaturelayer.FeatureClass.ShapeFieldName)
{
fldValue[i] = Convert.ToString(pFeature.Shape.GeometryType);
}
else
fldValue[i] = Convert.ToString(pFeature.get_Value(i));
}
dataGridView1.Rows.Add(fldValue);
pFeature = pFeatureCursor.NextFeature();
}
}
搞定~接下来就是在初始界面选定要素后跳转界面显示属性表了~
先在form1中进行预定义:
IFeatureLayer pFeatureLayer = null;
public IFeatureLayer pGlobalFeatureLayer; //定义全局变量
public ILayer player;
因为决定在右击鼠标时显示选项,在Form1窗体中添加contextMenuStrip控件,添加选项”显示属性表“,在click事件中打开新form:
Form2 Ft = new Form2(player as IFeatureLayer);
Ft.Show();
然后就保证右键点击相关图层要素后能够成功打开对应属性表啦,这里主要用了TOCControl的 HitTest()方法:
publicvoid HitTest ( int X, int Y, ref esriTOCControlItem ItemType, ref IBasicMapBasicMap, ref ILayer Layer, ref object Unk, ref object Data );
其中 X,Y:鼠标点击的坐标;
ITemType:esriTOCControlItem枚举常量
BasicMap:绑定MapControl的IBasicMap接口
Layer:被点击的图层
Unk:TOCControl的LegendGroup对象
Data:LegendClass在LegendGroup中的Index。
在TOCControl控件的 OnMouseDown 事件下添加如下代码即可~:
if (axMapControl1.LayerCount > 0)
{
esriTOCControlItem pItem = new esriTOCControlItem();
pGlobalFeatureLayer = new FeatureLayerClass();
IBasicMap pBasicMap = new MapClass();
object pOther = new object();
object pIndex = new object();
axTOCControl1.HitTest(e.x, e.y, ref pItem, ref pBasicMap, ref player, ref pOther, ref pIndex);
}
if (e.button == 2)
{
contextMenuStrip1.Show(axTOCControl1, e.x, e.y);
}
大功告成~~
运行结果如下:
右击显示属性表:
点击后出现属性表~~~: