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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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