asp DataTable添加列和行的三種方法

#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"] = "大話西游"; 
newRow["Version"] = "2.0"; 
newRow["Description"] = "我很喜歡"; 
tblDatas.Rows.Add(newRow); 
newRow = tblDatas.NewRow(); 
newRow["Product"] = "夢幻西游"; 
newRow["Version"] = "3.0"; 
newRow["Description"] = "比大話更幼稚"; 
tblDatas.Rows.Add(newRow); 
#endregion 
 
 代碼如下:

#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 
 
 代碼如下:

#region 方法三： 
DataTable table = new DataTable(); 
//創(chuàng)建table的第一列 
DataColumn priceColumn = new DataColumn(); 
priceColumn.DataType = System.Type.GetType("System.Decimal");//該列的數(shù)據(jù)類型 
priceColumn.ColumnName = "price";//該列得名稱 
priceColumn.DefaultValue = 50;//該列得默認(rèn)值 
// 創(chuàng)建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(shè)置該列得表達(dá)式，用于計算列中的值或創(chuàng)建聚合列 
// 創(chuàng)建table的第三列 
DataColumn totalColumn = new DataColumn(); 
totalColumn.DataType = System.Type.GetType("System.Decimal"); 
totalColumn.ColumnName = "total"; 
totalColumn.Expression = "price + tax";//該列的表達(dá)式，是第一列和第二列值得和 
// 將所有的列添加到table上 
table.Columns.Add(priceColumn); 
table.Columns.Add(taxColumn); 
table.Columns.Add(totalColumn); 
//創(chuàng)建一行 
DataRow row = table.NewRow(); 
table.Rows.Add(row);//將此行添加到table中 
//將table放在試圖中 
DataView view = new DataView(table); 
//綁定到DataGrid 
dg.DataSource = view; 
dg.DataBind(); 
#endregion 

 
 




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