DataTabel 与DataView之间的转化

DataTable转为DataView，或者反之转化， 
使用的是文档/试图模型，DataTable可以有多个视图,这样就可以不需要借助List类型对dataTable数据进行筛选或者排序

 //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"] = "张三";
                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"] = "赵六1";
                dr["Age"] = "37";
                dr["Address"] = "杭州";
                dt.Rows.Add(dr);
            }
            //dataTable 转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;

            //多条件筛选  若是字段与条件的类型不一致会报错
            //dv.RowFilter = "Age >30";
            //dv.RowFilter = "Name like '%赵六%'";
            //dv.RowFilter = "Name='赵六'";
            //排序
            //dv.Sort = "Age desc";
            //dv.Sort = "Age asc";

            //根据字段长度控制显示
            //dv.RowFilter = "Len(Name)>2";

           //dataView转为dataTable的时候 可以指定显示的字段
           //DataTable dt1= dv.ToTable(true,new string[] {"Id","Name" });
           //DataTable dd2 = dv.ToTable(true,"Id","Name","Age");