C#创建DataTable的几种方式

           DataTable table = new DataTable();

            DataColumn strNameColumn = new DataColumn();//创建table的第一列
            strNameColumn.DataType = System.Type.GetType("System.String");//该列的数据类型
            strNameColumn.ColumnName = "strName";//该列得名称

            DataColumn strSexColumn = new DataColumn();
            strSexColumn.DataType = System.Type.GetType("System.String");
            strSexColumn.ColumnName = "strSex";

            DataColumn strEmailColumn = new DataColumn();
            strEmailColumn.DataType = System.Type.GetType("System.String");
            strEmailColumn.ColumnName = "strEmail";

            // 将所有的列添加到table上
            table.Columns.Add(strNameColumn);
            table.Columns.Add(strSexColumn);
            table.Columns.Add(strEmailColumn);

            //添加数据
            DataRow rowData = table.NewRow();
            rowData["strName"] = "Tom";
            rowData["strSex"] = "男";
            rowData["strEmail"] = "Tom@atguigu.com";
            table.Rows.Add(rowData);

            rowData = table.NewRow();
            rowData["strName"] = "Lucy";
            rowData["strSex"] = "女";
            rowData["strEmail"] = "Lucy@atguigu.com";
            table.Rows.Add(rowData);

            rowData = table.NewRow();
            rowData["strName"] = "Jack";
            rowData["strSex"] = "男";
            rowData["strEmail"] = "Jack@atguigu.com";
            table.Rows.Add(rowData);

            DataTable table = new DataTable();
            table.Columns.Add("strName", Type.GetType("System.String"));
            table.Columns.Add("strSex", Type.GetType("System.String"));
            table.Columns.Add("strEmail", Type.GetType("System.String"));

            table.Rows.Add(new object[] { "Tom", "男", "Tom@atguigu.com" });
            table.Rows.Add(new object[] { "Lucy", "女", "Lucy@atguigu.com" });
            table.Rows.Add(new object[] { "Jack", "男", "Jack@atguigu.com" });

            DataTable dt = new DataTable();
            DataColumn dc1 = new DataColumn("strName", Type.GetType("System.String"));
            DataColumn dc2 = new DataColumn("strSex", Type.GetType("System.String"));
            DataColumn dc3 = new DataColumn("strEmail", Type.GetType("System.String"));
            dt.Columns.Add(dc1);
            dt.Columns.Add(dc2);
            dt.Columns.Add(dc3);
            //添加三条数据　　　　

            DataRow row = dt.NewRow();
            row["strName"] = "Tom";
            row["strSex"] = "男";
            row["strEmail"] = "Tom@atguigu.com";
            dt.Rows.Add(row);

            row = dt.NewRow();
            row["strName"] = "Lucy";
            row["strSex"] = "女";
            row["strEmail"] = "Lucy@atguigu.com";
            dt.Rows.Add(row);

            row = dt.NewRow();
            row["strName"] = "Jack";
            row["strSex"] = "男";
            row["strEmail"] = "Jack@atguigu.com";
            dt.Rows.Add(row);