asp DataTable新增列和行的三種方法

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複製程式碼 程式碼如下:
#region 方法一:
DataTable tblDatas = new DataTable(“Datas”);

DataColumn dc = null;
dc = tblDatas.Columns.Add(“ID”, Type.GetType(“System.Int32”));
dc.AutoIncrement = true;//自動增加
dc.AutoIncrementSeed = 1;//起始為1
dc.AutoIncrementStep = 1;//步長為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”] = “大話西遊”;
newRow[“Version”] = “2.0”;
newRow[“Description”] = “我很喜歡”;
tblDatas.Rows.Add(newRow);

newRow = tblDatas.NewRow();
newRow[“Product”] = “夢幻西遊”;
newRow[“Version”] = “3.0”;
newRow[“Description”] = “比大話更幼稚”;
tblDatas.Rows.Add(newRow);
#endregion

複製程式碼 程式碼如下:
#region 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” });
#endregion

複製程式碼 程式碼如下:
#region 方法三:
DataTable table = new DataTable();

//建立table的第一列
DataColumn priceColumn = new DataColumn();
priceColumn.DataType = System.Type.GetType(“System.Decimal”);//該列的資料型別
priceColumn.ColumnName = “price”;//該列得名稱
priceColumn.DefaultValue = 50;//該列得預設值

// 建立table的第二列
DataColumn taxColumn = new DataColumn();
taxColumn.DataType = System.Type.GetType(“System.Decimal”);
taxColumn.ColumnName = “tax”;//列名
taxColumn.Expression = “price * 0.0862”;//設定該列得表示式,用於計算列中的值或建立聚合列

// 建立table的第三列
DataColumn totalColumn = new DataColumn();
totalColumn.DataType = System.Type.GetType(“System.Decimal”);
totalColumn.ColumnName = “total”;
totalColumn.Expression = “price tax”;//該列的表示式,是第一列和第二列值得和

// 將所有的列新增到table上
table.Columns.Add(priceColumn);
table.Columns.Add(taxColumn);
table.Columns.Add(totalColumn);

//建立一行
DataRow row = table.NewRow();
table.Rows.Add(row);//將此行新增到table中

//將table放在試圖中
DataView view = new DataView(table);

//繫結到DataGrid
dg.DataSource = view;
dg.DataBind();
#endregion

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