向 DataTable 新增 一列

  //新增列  
            DataColumn dc = new DataColumn();
            dc.DataType = System.Type.GetType("System.String");
            dc.ColumnName = "isException";

datatable 新增行 並放在第一行

DataTable dt = new DataTable();

            dt = db.reDt(sqlstr);

            //新增新的一行
            DataRow dr = dt.NewRow();
            dr["apll_id"] = 0 ;
            dr["apll_name"] = "請選擇";
 // 插入到指定位置
            dt.Rows.InsertAt(dr,0);
 

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); 
 

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(); 

//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();