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/// <summary>
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/// 列得表达式求值
3 /// 孙二永20070612
4 /// </summary>
5 /// <param name="sender"></param>
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/// <param name="e"></param>
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private void Button2_Click(object sender, System.EventArgs e)
8 {
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10 DataTable table = new DataTable ();
11
12 //创建table的第一列
13 DataColumn priceColumn = new DataColumn();
14 //该列的数据类型
15 priceColumn.DataType = System.Type.GetType("System.Decimal");
16 //该列得名称
17 priceColumn.ColumnName = "price";
18 //该列得默认值
19 priceColumn.DefaultValue = 50;
20
21 // 创建table的第二列
22 DataColumn taxColumn = new DataColumn();
23 taxColumn.DataType = System.Type.GetType("System.Decimal");
24 //列名
25 taxColumn.ColumnName = "tax";
26 //设置该列得表达式，用于计算列中的值或创建聚合列
27 taxColumn.Expression = "price * 0.0862";
28
29
30 // Create third column.
31 DataColumn totalColumn = new DataColumn();
32
33 totalColumn.DataType = System.Type.GetType("System.Decimal");
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35 totalColumn.ColumnName = "total";
36 //该列的表达式，值是得到的是第一列和第二列值得和
37 totalColumn.Expression = "price + tax";
38
39 // 将所有的列添加到table上
40 table.Columns.Add(priceColumn);
41 table.Columns.Add(taxColumn);
42 table.Columns.Add(totalColumn);
43
44 //创建一行
45 DataRow row = table.NewRow();
46
47 //将此行添加到table中
48 table.Rows.Add(row);
49
50 //将table放在试图中
51 DataView view = new DataView(table);
52
53 dg.DataSource = view;
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55 dg.DataBind();
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62 }
63
/// <summary>
2
/// 列得表达式求值3
/// 孙二永200706124
/// </summary>5
/// <param name="sender"></param>6
/// <param name="e"></param>7
private void Button2_Click(object sender, System.EventArgs e)8
{
9
10
DataTable table = new DataTable ();11
12
//创建table的第一列13
DataColumn priceColumn = new DataColumn();14
//该列的数据类型15
priceColumn.DataType = System.Type.GetType("System.Decimal");16
//该列得名称17
priceColumn.ColumnName = "price";18
//该列得默认值19
priceColumn.DefaultValue = 50;20
21
// 创建table的第二列22
DataColumn taxColumn = new DataColumn();23
taxColumn.DataType = System.Type.GetType("System.Decimal");24
//列名25
taxColumn.ColumnName = "tax";26
//设置该列得表达式，用于计算列中的值或创建聚合列27
taxColumn.Expression = "price * 0.0862";28
29
30
// Create third column.31
DataColumn totalColumn = new DataColumn();32
33
totalColumn.DataType = System.Type.GetType("System.Decimal");34
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totalColumn.ColumnName = "total";36
//该列的表达式，值是得到的是第一列和第二列值得和37
totalColumn.Expression = "price + tax"; 38
39
// 将所有的列添加到table上40
table.Columns.Add(priceColumn);41
table.Columns.Add(taxColumn);42
table.Columns.Add(totalColumn);43
44
//创建一行45
DataRow row = table.NewRow();46
47
//将此行添加到table中48
table.Rows.Add(row);49
50
//将table放在试图中51
DataView view = new DataView(table);52
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dg.DataSource = view;54
55
dg.DataBind();56
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}63