摘要: Code //构造一个DataView对象,传递死个函数 DataView dv=new DataView(dt,"country='Germany'","country",DataViewRowState.CurrentRows); 第一个参数:DataTable,第二个:对DataTable内容进行筛选的筛选器, 第三个是排序列,最后一个参数是指定要在视图中包含的行的类型. System... 阅读全文
posted @ 2008-11-21 21:14 Thinking.N 阅读(1280) 评论(1) 推荐(0) 编辑
摘要: 在调用Fill()方法时,如果连接没有打开,fill()就自动打开,在数据填充完毕后关闭它. 如果在调用Fill()方法时打开了连接,fill()就使用该连接,But won't close it after it uesd it ! 虽然数据集完全独立于与数据库和连接,但是使用数据集并不意味着和数据库断开连接. 如果要在断开的情况下运行就可以用数据集,但是在填充他之前不要打开l连接(或者如果... 阅读全文
posted @ 2008-11-21 20:40 Thinking.N 阅读(494) 评论(0) 推荐(0) 编辑
摘要: Code //先创建数据适配器, SqlDataAdapter da=new SqlDataAdapter(); da.SelectCommand=new SqlCommand(sql,conn); //创建和填充数据集 DataSet ds=new DataSet(); da.Fill(ds,"Customers"); //每个查询返回一个数据集,每个结果都保存在单独的DataTable... 阅读全文
posted @ 2008-11-21 20:27 Thinking.N 阅读(1612) 评论(0) 推荐(0) 编辑
摘要: Code Code highlighting produced by Actipro CodeHighlighter (freeware) http://www.CodeHighlighter.com/ -->using System; using System.Collections.Generic; using System.Linq; using System.Text; using ... 阅读全文
posted @ 2008-11-21 18:54 Thinking.N 阅读(221) 评论(0) 推荐(0) 编辑
摘要: 左对齐此字符串中的字符,在右边用空格或指定的 Unicode 字符填充以达到指定的总长度。 1.String.PadRight (Int32) 左对齐此字符串中的字符,在右边用空格填充以达到指定的总长度。 由 .NET Compact Framework 支持。 2.String.PadRight (Int32, Char) ... 阅读全文
posted @ 2008-11-21 15:44 Thinking.N 阅读(966) 评论(0) 推荐(0) 编辑
摘要: Code Code highlighting produced by Actipro CodeHighlighter (freeware) http://www.CodeHighlighter.com/ -->using System; using System.Collections.Generic; using System.Linq; using System.Text; using ... 阅读全文
posted @ 2008-11-21 15:38 Thinking.N 阅读(371) 评论(0) 推荐(0) 编辑
摘要: Code Code highlighting produced by Actipro CodeHighlighter (freeware) http://www.CodeHighlighter.com/ -->using System; using System.Collections.Generic; using System.Linq; using System.Text; using ... 阅读全文
posted @ 2008-11-21 15:23 Thinking.N 阅读(622) 评论(0) 推荐(0) 编辑
摘要: Code Code highlighting produced by Actipro CodeHighlighter (freeware) http://www.CodeHighlighter.com/ -->using System; using System.Collections.Generic; using System.Linq; using System.Text; using ... 阅读全文
posted @ 2008-11-21 15:22 Thinking.N 阅读(230) 评论(0) 推荐(0) 编辑
摘要: Code Code highlighting produced by Actipro CodeHighlighter (freeware) http://www.CodeHighlighter.com/ -->using System; using System.Collections.Generic; using System.Linq; using System.Text; using ... 阅读全文
posted @ 2008-11-21 15:03 Thinking.N 阅读(913) 评论(0) 推荐(0) 编辑
摘要: Code Code highlighting produced by Actipro CodeHighlighter (freeware) http://www.CodeHighlighter.com/ -->using System; using System.Collections.Generic; using System.Text; using System.Data; using ... 阅读全文
posted @ 2008-11-21 12:13 Thinking.N 阅读(175) 评论(0) 推荐(0) 编辑
摘要: SqlDataReader有Reader和GetValue()方法,前者是提取一行,后者是取行中某一列的值! eg: SqlDataReader rdr=cmd.ExecuteReader(); // Table Northwind.Employees: While(rdr.Read()) { Console.WriteLine("Employee name:{0}{1}",rdr.GetV... 阅读全文
posted @ 2008-11-21 11:46 Thinking.N 阅读(600) 评论(0) 推荐(0) 编辑
摘要: Code Code highlighting produced by Actipro CodeHighlighter (freeware) http://www.CodeHighlighter.com/ -->using System; using System.Collections.Generic; using System.Text; using System.Data; using ... 阅读全文
posted @ 2008-11-21 11:26 Thinking.N 阅读(153) 评论(0) 推荐(0) 编辑
摘要: Code Code highlighting produced by Actipro CodeHighlighter (freeware) http://www.CodeHighlighter.com/ -->using System; using System.Collections.Generic; using System.Text; using System.Data; using ... 阅读全文
posted @ 2008-11-21 11:23 Thinking.N 阅读(144) 评论(0) 推荐(0) 编辑
摘要: Code Code highlighting produced by Actipro CodeHighlighter (freeware) http://www.CodeHighlighter.com/ -->using System; using System.Collections.Generic; using System.Text; using System.Data; using ... 阅读全文
posted @ 2008-11-21 10:57 Thinking.N 阅读(216) 评论(0) 推荐(0) 编辑
摘要: Code Code highlighting produced by Actipro CodeHighlighter (freeware) http://www.CodeHighlighter.com/ -->using System; using System.Collections.Generic; using System.Text; using System.Data; using ... 阅读全文
posted @ 2008-11-21 10:54 Thinking.N 阅读(262) 评论(0) 推荐(0) 编辑