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.DataTable dt  =   new  DataTable();
        System.Data.DataSet ds  =   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(DataTable dt,  string  Name,  string  Catalog,  int  Salary)
         ... {
            System.Data.DataRow drow  =  dt.NewRow();
            drow[ " ID " ]  =  Name;
            drow[ " 板块 " ]  =  Catalog;
            drow[ " 积分 " ]  =  Salary;
            dt.Rows.Add(drow);
        }


         private   void  Form1_Load( object  sender, EventArgs e)
         ... {

             // 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.DataTable dtGroup1 = dt.DefaultView.ToTable( true , " ID " );
            dtGroup1.TableName  =   " Table2 " ;
            ds.Tables.Add(dtGroup1);
            System.Data.DataRelation dr  =   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, EventArgs e)
         ... {
             // 设置combobox2和comboBox1同步
            System.Data.DataView dv  =   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);

        }          
    }
}