Table是怎样炼成的：SaleReport Table的继承者

有了Table，我们对其继承，实现更符合业务要求的类

1/**////<summary>
2///描述一个销售报表
3///</summary>
4publicclassSaleReport:Table
5{
6
7publicSaleReport(stringreportName)
8:base(reportName,newColumnCollection())
9{
10
11this.Columns.Add("序号",typeof(int),0);
12this.Columns.Add("姓名",typeof(string),null);
13this.Columns.Add("商品名称",typeof(string),null);
14this.Columns.Add("日期",typeof(DateTime),null);
15this.Columns.Add("数量",typeof(double),null);
16}
17
18/**////<summary>
19///报表的名称
20///</summary>
21publicstringName
22{
23get
24{
25returnthis.Name;
26}
27}
28
29/**////<summary>
30///加入数据
31///</summary>
32///<paramname="staff"></param>
33///<paramname="commodity"></param>
34///<paramname="cash"></param>
35publicvoidAddRecord(stringstaff,stringcommodity,doublecash)
36{
37Rowrow=this.NewRow();
38row["序号"]=this.Rows.Count+1;
39row["姓名"]=staff;
40row["商品名称"]=commodity;
41row["日期"]=DateTime.Now;
42row["数量"]=cash;
43
44this.Rows.Add(row);
45}
46
47/**////<summary>
48///移除数据
49///</summary>
50///<paramname="index"></param>
51publicvoidRemoveAt(intindex)
52{
53this.Rows.RemoveAt(index);
54}
55
56/**////<summary>
57///返回销售报表的销售金额
58///</summary>
59///<returns></returns>
60publicdoubleGetTotal()
61{
62doublecash=0;
63foreach(Rowrowinthis.Rows)
64{
65cash+=(double)row["数量"];
66}
67returncash;
68}
69
70/**////<summary>
71///返回销售报表的销售金额
72///</summary>
73///<paramname="staff">销售员</param>
74///<returns></returns>
75publicdoubleGetTotal(stringstaff)
76{
77doublecash=0;
78foreach(Rowrowinthis.Rows)
79{
80if((string)row["姓名"]==staff)
81{
82cash+=(double)row["数量"];
83}
84}
85returncash;
86}
87
88}

SaleReport对外封装了对Table的处理细节，使用SaleReport的用户不会感觉到在使用Table类

1SaleReportreport=newSaleReport("销售台帐");
2report.AddRecord("Alex","Phone",2600);
3report.AddRecord("Alex","PC",4560);
4report.AddRecord("Alex","Table",234);
5report.AddRecord("Sidney","Phone",2100);
6report.AddRecord("Sidney","TV",4500);
7report.AddRecord("Tom","oven",300);
8report.AddRecord("Leo","oven",240);
9
10report.Print();

运行的结果是
序号 姓名 商品名称 日期 数量

1 Alex Phone 2007-2-13 23:19:27 2600
2 Alex PC 2007-2-13 23:19:27 4560
3 Alex Table 2007-2-13 23:19:27 234
4 Sidney Phone 2007-2-13 23:19:27 2100
5 Sidney TV 2007-2-13 23:19:27 4500
6 Tom oven 2007-2-13 23:19:27 300
7 Leo oven 2007-2-13 23:19:27 240