DataTable dtStepX = new DataTable("dtStepX"); DataTable dtStepS = new DataTable("dtStepS"); //获取两个数据源的并集 IEnumerable<DataRow> query = dtStepS.AsEnumerable().Union(dtStepX.AsEnumerable(), DataRowComparer.Default); //两个数据源的并集集合 Dat…

可以通过linq对现有的DataTable进行查询,并将结果拷贝至新的DataTable中例如: // Query the SalesOrderHeader table for orders placed // after August 8, 2001. IEnumerable<DataRow> query = from order in orders.AsEnumerable() where order.Field<DateTime>("OrderDate")…

/// <summary>         /// 将两个列不同(结构不同)的DataTable合并成一个新的DataTable         /// </summary>         /// <param name="DataTable1">表1</param>         /// <param name="DataTable2">表2</param>         /// <…

转载自 http://blog.csdn.net/wangxiaojia42121/article/details/53330464 谢谢 //两个结构一样的DT合并DataTable DataTable1 = new DataTable();DataTable DataTable2 = new DataTable();DataTable newDataTable = DataTable1.Clone(); object[] obj = new object[newDataTable.Colum…

LINQ to DataSet需要使用System.Core.dll.System.Data.dll和System.Data.DataSetExtensions.dll,在项目中添加引用System.Data和System.Data.DataSetExtensions. 1. DataTable读取列表 DataSet ds = new DataSet(); // 省略ds的Fill代码 DataTable products = ds.Tables["Product"]; IEnume…

LINQ to DataSet需要使用System.Core.dll.System.Data.dll和System.Data.DataSetExtensions.dll,在项目中添加引用System.Data和System.Data.DataSetExtensions. 1. DataTable读取列表 DataSet ds = new DataSet(); // 省略ds的Fill代码 DataTable products = ds.Tables["Product"]; IEnume…

合并: DataTable pros=xxx; DataTable pstar=yyy; //将两张DataTable合成一张 foreach (DataRow dr in pstar.Rows) { pros.ImportRow(dr); } DataTable设置主键,并判断重复 DataTable allpros =xxx; 单列设为主键: //设置第某列为主键 allpros.PrimaryKey = new DataColumn[] { pros.Columns[0]}; foreac…

1. DataTable读取列表 DataSet ds = new DataSet();// 省略ds的Fill代码DataTable products = ds.Tables["Product"];IEnumerable<DataRow> rows = from p in products.AsEnumerable() select p;foreach (DataRow row in rows){ Console.WriteLine(row.Field<string…

public static DataTable UniteDataTableColumns(DataTable dt, String newColumnName, string ColumnName1, string ColumnName2) { //汇总的表达式 string expression = ""; expression = String.Format("{0}+'('+{1}+')'", ColumnName1, ColumnName2); //增加汇…

查询DataTable返回List List<string> listNation = dtNation.AsEnumerable().Select(d => d.Field<string>("MZMC").Trim()).Distinct().ToList(); 查询DataTable返回string string strB = (from DataRow r in dtA.Rows where r.Field<string>("A…