C#客户端绑定DataView和DataTable的几个技巧

这几个问题算不上高级技巧，但是的确还有很多人不知道，尤其是对DataView了解比较少，下面代码演示了如何绑定数据到combobx和datagridview，另外还包括了如何在绑定时过滤重复，设置联动，以及如何利用DataRelation求汇总表格。程序界面请读者自己生成，一个form，两个combobox，三个datagridview就可以了。

参考界面如下

程序代码如下

using System;
using System.ComponentModel;
using System.Data;
using System.Windows.Forms;

namespace WindowsApplication6
... {
public partial class Form1:Form
... {
public Form1()
... {
InitializeComponent();
initData();
}

System.Data.DataTabledt = new DataTable();
System.Data.DataSetds = new DataSet();

/**/ /// <summary>
/// 初始化数据
/// </summary>
private void initData()
... {
dt.TableName = " Table1 " ;
ds.Tables.Add(dt);
dt.Columns.Add( " ID " , typeof ( string ));
dt.Columns.Add( " 板块 " , typeof ( string ));
dt.Columns.Add( " 积分 " , typeof ( int ));

addData(dt, " jinjazz " , " delphi " , 50000 );
addData(dt, " jinjazz " , " Sqlserver " , 10000 );
addData(dt, " jinjazz " , " .net " , 20000 );
addData(dt, " zjcxc " , " Sqlserver " , 900000 );
addData(dt, " zjcxc " , " vb " , 10000 );
addData(dt, " zswang " , " delphi " , 70000 );
addData(dt, " zswang " , " .net " , 30000 );
}

private void addData(DataTabledt, string Name, string Catalog, int Salary)
... {
System.Data.DataRowdrow = dt.NewRow();
drow[ " ID " ] = Name;
drow[ " 板块 " ] = Catalog;
drow[ " 积分 " ] = Salary;
dt.Rows.Add(drow);
}


private void Form1_Load( object sender,EventArgse)
... {

// 绑定所有ID到comboBox1
this .comboBox1.DataSource = dt.DefaultView.ToTable( true , new string [] ... { " ID " } );
this .comboBox1.DisplayMember = " ID " ;

// 绑定所有板块到comboBox2
this .comboBox2.DataSource = new DataView(dt);
this .comboBox2.DisplayMember = " 板块 " ;

// 设置两个联动刷新
this .comboBox1.SelectedIndexChanged += new EventHandler(comboBox1_SelectedIndexChanged);

// 绑定所有数据到dataGridView1
this .dataGridView1.DataSource = dt;

// 绑定所有数据到dataGridView2
this .dataGridView2.DataSource = new DataView(dt);

// 利用DataRelation求汇总表格
System.Data.DataTabledtGroup1 = dt.DefaultView.ToTable( true , " ID " );
dtGroup1.TableName = " Table2 " ;
ds.Tables.Add(dtGroup1);
System.Data.DataRelationdr = new DataRelation( " relation " ,dtGroup1.Columns[ " ID " ],dt.Columns[ " ID " ]);
ds.Relations.Add(dr);
dtGroup1.Columns.Add( " 总积分 " ).Expression = " sum(child(relation).积分) " ;
dtGroup1.Columns.Add( " 板块数 " ).Expression = " count(child(relation).板块) " ;
this .dataGridView3.DataSource = dtGroup1;

}

void comboBox1_SelectedIndexChanged( object sender,EventArgse)
... {
// 设置combobox2和comboBox1同步
System.Data.DataViewdv = this .comboBox2.DataSource as DataView;
dv.RowFilter = string .Format( " ID='{0}' " , this .comboBox1.Text);
// 设置dataGridView2和comboBox1同步
dv = this .dataGridView2.DataSource as DataView;
dv.RowFilter = string .Format( " ID='{0}' " , this .comboBox1.Text);

}
}
}