C#创建datatable

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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1dc.AutoIncrementStep = 1;//步长为1dc.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();
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