DataTable添加列和行的三种方法

#region 方法一:

DataTable tblDatas =new DataTable("Datas");

DataColumn dc =null;

dc = tblDatas.Columns.Add("ID", Type.GetType("System.Int32"));

dc.AutoIncrement =true;//自动增加

dc.AutoIncrementSeed =1;//起始为1

dc.AutoIncrementStep =1;//步长为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"]
="这个地方是单元格的值";

newRow["Version"]
="2.0";

newRow["Description"]
="这个地方是单元格的值";

tblDatas.Rows.Add(newRow);

newRow = tblDatas.NewRow();

newRow["Product"]
="这个地方是单元格的值";

newRow["Version"]
="3.0";

newRow["Description"]
="这个地方是单元格的值";

tblDatas.Rows.Add(newRow);
#endregion
 

#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(newobject[] {
null,
"a",
"b",
"c" });

tblDatas.Rows.Add(newobject[] {
null,
"a",
"b",
"c" });

tblDatas.Rows.Add(newobject[] {
null,
"a",
"b",
"c" });

tblDatas.Rows.Add(newobject[] {
null,
"a",
"b",
"c" });

tblDatas.Rows.Add(newobject[] {
null,
"a",
"b",
"c" });

#endregion

 

 

#region 方法三：

DataTable table =new DataTable();

//创建table的第一列

DataColumn priceColumn =new DataColumn();

priceColumn.DataType = System.Type.GetType("System.Decimal");//该列的数据类型

priceColumn.ColumnName ="price";//该列得名称

priceColumn.DefaultValue =50;//该列得默认值

// 创建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";//设置该列得表达式，用于计算列中的值或创建聚合列

// 创建table的第三列

DataColumn totalColumn =new DataColumn();

totalColumn.DataType = System.Type.GetType("System.Decimal");

totalColumn.ColumnName ="total";

totalColumn.Expression ="price + tax";//该列的表达式，是第一列和第二列值得和

// 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();

table.Rows.Add(row);//将此行添加到table中

//将table放在视图中

DataView view =new DataView(table);

//绑定到DataGrid

dg.DataSource = view;

dg.DataBind();
#endregion