C#构建DataTable(转)
Asp.net DataTable添加列和行的方法 方法一: DataTable tblDatas = new DataTable("Datas"); DataColumn dc = null; dc = tblDatas.Columns.Add("ID", Type.GetType("System.Int32")); dc.AutoIncrement = true;//自动增加 dc.AutoIncrementSeed = 1;//起始为1 dc.AutoIncrementStep = 1;//步长为1 dc.AllowDBNull = false;// dc = tblDatas.Columns.Add("Product", Type.GetType("System.String")); dc = tblDatas.Columns.Add("Version", Type.GetType("System.String")); dc = tblDatas.Columns.Add("Description", Type.GetType("System.String")); DataRow newRow; newRow = tblDatas.NewRow(); newRow["Product"] = "大话西游"; newRow["Version"] = "2.0"; newRow["Description"] = "我很喜欢"; tblDatas.Rows.Add(newRow); newRow = tblDatas.NewRow(); newRow["Product"] = "梦幻西游"; newRow["Version"] = "3.0"; newRow["Description"] = "比大话更幼稚"; tblDatas.Rows.Add(newRow); 方法二: DataTable tblDatas = new DataTable("Datas"); tblDatas.Columns.Add("ID", Type.GetType("System.Int32")); tblDatas.Columns[0].AutoIncrement = true; tblDatas.Columns[0].AutoIncrementSeed = 1; tblDatas.Columns[0].AutoIncrementStep = 1; tblDatas.Columns.Add("Product", Type.GetType("System.String")); tblDatas.Columns.Add("Version", Type.GetType("System.String")); tblDatas.Columns.Add("Description", Type.GetType("System.String")); tblDatas.Rows.Add(new object[]{null,"a","b","c"}); tblDatas.Rows.Add(new object[] { null, "a", "b", "c" }); tblDatas.Rows.Add(new object[] { null, "a", "b", "c" }); tblDatas.Rows.Add(new object[] { null, "a", "b", "c" }); tblDatas.Rows.Add(new object[] { null, "a", "b", "c" }); 方法三: DataTable table = new DataTable (); //创建table的第一列 DataColumn priceColumn = new DataColumn(); //该列的数据类型 priceColumn.DataType = System.Type.GetType("System.Decimal"); //该列得名称 priceColumn.ColumnName = "price"; //该列得默认值 priceColumn.DefaultValue = 50; // 创建table的第二列 DataColumn taxColumn = new DataColumn(); taxColumn.DataType = System.Type.GetType("System.Decimal"); //列名 taxColumn.ColumnName = "tax"; //设置该列得表达式,用于计算列中的值或创建聚合列 taxColumn.Expression = "price * 0.0862"; // Create third column. DataColumn totalColumn = new DataColumn(); totalColumn.DataType = System.Type.GetType("System.Decimal"); totalColumn.ColumnName = "total"; //该列的表达式,值是得到的是第一列和第二列值得和 totalColumn.Expression = "price + tax"; // 将所有的列添加到table上 table.Columns.Add(priceColumn); table.Columns.Add(taxColumn); table.Columns.Add(totalColumn); //创建一行 DataRow row = table.NewRow(); //将此行添加到table中 table.Rows.Add(row); //将table放在试图中 DataView view = new DataView(table); dg.DataSource = view; dg.DataBind();
posted on 2017-09-07 09:32 YellowCool 阅读(276) 评论(0) 编辑 收藏 举报