MapXtreme2004数据绑定的例子

左半边

数据绑定的例子
数据绑定的例子。当数据表中的值改变，Pennsylvania 州的颜色会改变。


private void button1_Click(object sender, System.EventArgs e)
{
Session.Current.Catalog.CloseAll();
Table USATab = USATab = Session.Current.Catalog.OpenTable(@"c:\program files\mapinfo\mapxtreme\6.0\samples\data\usa.tab");
FeatureLayer fl = new FeatureLayer(USATab);
mapControl1.Map.Layers.Add(fl);

System.Data.DataTable dt = new System.Data.DataTable("USStuff");
dt.Columns.Add("USState", typeof(System.String));
dt.Columns.Add("SomeIndValue", typeof(System.String));
dt.Rows.Add(new object[]{"NY", "Dem"});
dt.Rows.Add(new object[]{"PA", "Rep"});
dt.Rows.Add(new object[]{"VT", "Dem"});
dt.Rows.Add(new object[]{"OH", "Rep"});


TableInfoAdoNet tian = new TableInfoAdoNet("VoteRecord", dt);
Table USVote = Session.Current.Catalog.CreateTable(tian);
Columns cols = new Columns();
cols.Add(USVote.TableInfo.Columns["SomeIndValue"].Clone());

USATab.AddColumns(cols, BindType.DynamicCopy, USVote, "USState", Operator.Equal, "State");

MapInfo.Mapping.Thematics.IndividualValueTheme thm = new MapInfo.Mapping.Thematics.IndividualValueTheme(fl, "SomeIndValue", "StateVotingRecord");
fl.Modifiers.Append(thm);
timer1.Start() ;
}

private void button2_Click(object sender, System.EventArgs e)
{

}

private void timer1_Tick(object sender, System.EventArgs e)
{
FeatureLayer fl = mapControl1.Map.Layers[0] as FeatureLayer;
System.Data.DataTable dt = (Session.Current.Catalog.GetTable("VoteRecord").TableInfo as TableInfoAdoNet).DataTable;
dt.Rows[1][1] = dt.Rows[1][1].ToString()=="Rep"?"Dem":"Rep";

Session.Current.Catalog.GetTable("VoteRecord").Refresh();
fl.Table.Refresh();
fl.Invalidate();
}