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"] = "大话西游";

newRow["Version"] = "2.0";

newRow["Description"] = "我很喜欢";

tblDatas.Rows.Add(newRow);

 

newRow = tblDatas.NewRow();

newRow["Product"] = "梦幻西游";

newRow["Version"] = "3.0";

newRow["Description"] = "比大话更幼稚";

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(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

 

 

 

 

#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放在试图中

DataView view = new DataView(table);

 

//绑定到DataGrid

dg.DataSource = view;

dg.DataBind();

#endregion