动态创建DataTable总结

最简单的：

DataTable dt = new DataTable();  

dt.Columns.Add("id");  

dt.Columns.Add("name");  

DataRow dr = dt.NewRow();  

for (int i = 0; i < 100; i++)  

{  

    dr = dt.NewRow();  

    dr["id"] = "00" + i.ToString();  

    dr["name"] = "姓名" + i.ToString();  

    dt.Rows.Add(dr);  

} 

其他：

方法一:

DataTable  tblDatas = newDataTable("Datas");
DataColumn dc = null;

//赋值给dc，是便于对每一个datacolumn的操作
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);

方法二:

 DataTable tblDatas = newDataTable("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(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 ();

  //创建table的第一列
DataColumn priceColumn = new DataColumn();
//该列的数据类型
priceColumn.DataType = System.Type.GetType("System.Decimal");
//该列得名称
 priceColumn.ColumnName = "price";
 //该列得默认值
priceColumn.DefaultValue =50;

// 创建table的第二列
DataColumn taxColumn = new DataColumn();
taxColumn.DataType = System.Type.GetType("System.Decimal");
 //列名
taxColumn.ColumnName = "tax";
//设置该列得表达式，用于计算列中的值或创建聚合列
taxColumn.expression_r_r = "price *0.0862";
// Create third column.
DataColumn totalColumn = new DataColumn();
totalColumn.DataType = System.Type.GetType("System.Decimal");
totalColumn.ColumnName = "total";
//该列的表达式，值是得到的是第一列和第二列值得和
totalColumn.expression_r_r = "price + tax";

// 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();
 //将此行添加到table中
table.Rows.Add(row);