一、DataTable新增行、列 public void CreateTable() { //创建表 DataTable dt = new DataTable(); //1、添加列 dt.Columns.Add("Name", typeof(string)); //数据类型为 文
DataTable dt=new DataTable("cart"); DataColumn dc1=new DataColumn("prizename",Type.GetType("System.String")); DataColumn dc2=new DataColumn("point",Type.GetType("System.Int16")); DataColumn dc3=new DataColumn("number",Type.GetType("System.Int16")); DataColumn dc4=new DataColumn("total...
答案是可以的,下面就是一个将 DataTable 中的数据写入到 XML 文件中去的操作,实例代码 如下所示:/创建一个 Customers 数据表DataTable dt = new DataTable("Customers");/ 47、添加两列 CustID ,CustLName 数据类型分别为 Int32 ,String , 并添加到数据表中DataColumn dc1 = new DataColumn("CustID", ...
DataTable dt =newDataTable("Customers"); //添加两列CustID,CustLName数据类型分别为Int32,String,并添加到数据表中 DataColumn dc1 =newDataColumn("CustID", Type.GetType("System.Int32")); DataColumn dc2 =newDataColumn("CustLName", Type.GetType("System.String")); dt.Columns.Add(dc1); dt.Colum...
DataTable dt=new DataTable();DataRow dr;dt.Columns.Add(new DataColumn("整数值 ", typeof(Int32)));dt.Columns.Add(new DataColumn("字符串值 ", typeof(string)));dt.Columns.Add(new DataColumn("日期时间值 ", typeof(DateTime)));dt.Columns.Add(new DataColumn("布尔值 ", typeof(bool)))...
DataTabledt=newDataTable(); dt.Columns.Add("id"); dt.Columns.Add("name"); DataRowdr=dt.NewRow(); for(inti=0;i<100;i++) { dr=dt.NewRow(); dr["id"]="00"+i.ToString(); dr["name"]="姓名"+i.ToString(); dt.Rows.Add(dr); ...
();comm.CommandType=CommandType.Text;comm.Connection=conn;stringstrql_select="select au_id,au_lname,au_fname,phone,address,city,state,zip,contract from authors";comm.CommandText=strql_select;DataTabledt=newDataTable();SqlDataAdapteradp=newSqlDataAdapter();adp.SelectCommand=comm;adp.Fill(dt);conn...
import datatable as dt # 创建 Pandas DataFrame df = pd.read_csv("data.csv") #将 Pandas DataFrame 转换为 DataTable data = dt.Frame(df) print(data) 基本操作 1. 预览数据 import datatable as dt # 加载数据 data = dt.fread("data.csv") ...
DataTable dt = new DataTable("foo"); DataColumn pkCol = new DataColumn("ID", Type.GetType("System.Int32")); pkCol.AutoIncrement = true; pkCol.AutoIncrementSeed = 1; pkCol.AutoIncrementStep = 1; dt.Columns.Add(pkCol); dt.PrimaryKey = new DataColumn[] { pkCol }; dt.Columns.Add...
usingSystem;usingSystem.Data;classMyDataSet{publicstaticvoidMain(){ DataTable dt =newDataTable(); DataColumn dc1 =newDataColumn("col1"); DataColumn dc2 =newDataColumn("col2"); DataColumn dc3 =newDataColumn("col3"); dt.Columns.Add(dc1); dt.Columns.Add(dc2); dt.Columns.Add(dc3);// Crea...