DataTabel 與DataView之間的轉化

DataTable轉為DataView，或者反之轉化， 
使用的是文檔/試圖模型，DataTable可以有多個視圖,這樣就可以不需要借助List類型對dataTable數據進行篩選或者排序

 //DataRow row = table.NewRow();
 //row.ItemArray = new object[] { 1, "Fruit", "Apple", 14 };
 //table.Rows.Add(row);

 //row = table.NewRow();
 //row.ItemArray = new object[] { 2, "Fruit", "Orange", 27 };
 //table.Rows.Add(row);

DataTable dt = new DataTable();
            dt.Columns.Add("Id",typeof(int));System.Type.GetType("System.Int32")
            dt.Columns.Add("Name",typeof(string));
            dt.Columns.Add("Age", typeof(int));
            dt.Columns.Add("Address",typeof(string));
            {
                DataRow dr = dt.NewRow();
                dr["Id"] = 1;
                dr["Name"] = "張三";
                dr["Age"] = "13";
                dr["Address"] = "杭州";
                dt.Rows.Add(dr);
            }
            {
                DataRow dr = dt.NewRow();
                dr["Id"] = 2;
                dr["Name"] = "李四";
                dr["Age"] = "20";
                dr["Address"] = "杭州";
                dt.Rows.Add(dr);
            }
            {
                DataRow dr = dt.NewRow();
                dr["Id"] = 3;
                dr["Name"] = "王五";
                dr["Age"] = "60";
                dr["Address"] = "杭州";
                dt.Rows.Add(dr);
            }

            {
                DataRow dr = dt.NewRow();
                dr["Id"] = 4;
                dr["Name"] = "趙六1";
                dr["Age"] = "37";
                dr["Address"] = "杭州";
                dt.Rows.Add(dr);
            }
            //dataTable 轉dataView的集中方式
            //DataView dv1 = new DataView(dt);
            //DataView dv1 = dt.AsDataView();
            //DataView dv1 = new DataView(); dv1.Table = dt;
            DataView dv = dt.DefaultView;

            //多條件篩選  若是字段與條件的類型不一致會報錯
            //dv.RowFilter = "Age >30";
            //dv.RowFilter = "Name like '%趙六%'";
            //dv.RowFilter = "Name='趙六'";
            //排序
            //dv.Sort = "Age desc";
            //dv.Sort = "Age asc";

            //根據字段長度控制顯示
            //dv.RowFilter = "Len(Name)>2";

           //dataView轉為dataTable的時候 可以指定顯示的字段
           //DataTable dt1= dv.ToTable(true,new string[] {"Id","Name" });
           //DataTable dd2 = dv.ToTable(true,"Id","Name","Age");