DataView 成员 : 表示用于排序、筛选、搜索、编辑和导航的 DataTable 的可绑定数据的自定义视图。(转)已修正

//DataView 成员 : 表示用于排序、筛选、搜索、编辑和导航的 DataTable 的可绑定数据的自定义视图。
    private void DemonstrateDataView()
    {
        // Create one DataTable with two column.
        DataTable table = new DataTable("table");
        DataColumn colItem = new DataColumn("Animal", Type.GetType("System.String"));
        table.Columns.Add(colItem);
        table.Columns.Add(new DataColumn("Age", typeof(string)));//两种方式加项目

        // Add five rows.
        DataRow NewRow;
        for (int i = 0; i < 5; i++)
        {
            NewRow = table.NewRow();
            NewRow["Animal"] = "Row" + i;
            table.Rows.Add(NewRow);
        }
        //结果:
        //Animal      Age
        //Row0  
        //Row1 
        //Row2 
        //Row3     
        //Row4         
        //----------------------------------------------------------------

        // Change the values in the table.
        table.Rows[0]["Animal"] = "Row_cat";
        table.Rows[1]["Animal"] = "Row_dog";
        table.AcceptChanges();
        //结果:
        //Animal      Age
        //Row_cat
        //Row_dog
        //Row2 
        //Row3 
        //Row4 
        //----------------------------------------------------------------

        // Create two DataView objects with the same table.
        DataView firstView = new DataView(table);

        //// Set the RowStateFilter to display only Added and modified rows.
        //firstView.RowStateFilter = DataViewRowState.ModifiedOriginal;
        //结果:
        //Animal      Age   
        //----------------------------------------------------------------

        // Delete three rows.
        table.Rows[1].Delete();
        table.Rows[2].Delete();
        table.Rows[3].Delete();
        //结果:
        //Animal      Age
        //Row_cat  
        //Row4  
        //----------------------------------------------------------------

        //// Set first DataView to show only modified  versions of original rows.
        //firstView.RowStateFilter = DataViewRowState.Deleted;          //DataViewRowState.Deleted表示只显示被删除了的行
        //结果:
        //Animal      Age
        //Row_dog
        //Row2 
        //Row3
        //----------------------------------------------------------------

        //// Set second DataView to show modified versions of current rows, or New rows.
        //firstView.RowStateFilter = DataViewRowState.ModifiedCurrent | DataViewRowState.Added;
        //结果:
        //Animal      Age
        //----------------------------------------------------------------

        //firstView.RowFilter = "Animal='Row_cat'";               //过滤行:显示项目Animal的行值为"'Row_cat'"
        //结果:
        //Animal      Age
        //Row_cat
        //----------------------------------------------------------------

        dataGrid1.DataSource = firstView;
        dataGrid1.DataBind();
    }