如何合并DataTable

Question

如题所述

Answer 1

看到CSDN朋友不断提问关于合并DataTable的问题（虽然DataTable.Merge可以很好的实现）。为了大家更好的改造或者理解，抽空简单写了几行代码，共享大家
两个结构一样的DataTable合并
DataTable DataTable1 = new DataTable();
DataTable DataTable2 = new DataTable();
DataTable newDataTable = DataTable1.Clone();
object[] obj = new object[newDataTable.Columns.Count];
for (int i = 0; i < DataTable1.Rows.Count; i++){DataTable1.Rows[i].ItemArray.CopyTo(obj,0);
newDataTable.Rows.Add(obj);}for (int i = 0; i < DataTable2.Rows.Count; i++){DataTable2.Rows[i].ItemArray.CopyTo(obj,0);
newDataTable.Rows.Add(obj);}//或者DataTable DataTable1 = new DataTable();
DataTable DataTable2 = new DataTable();
object[] obj = new object[DataTable1 .Columns.Count];
for (int i = 0; i < DataTable2.Rows.Count; i++){DataTable2.Rows[i].ItemArray.CopyTo(obj,0);
DataTable1.Rows.Add(obj);}两个结构不同的DataTable合并
/// <summary
/// 将两个列不同的DataTable合并成一个新的DataTable
/// </summary
/// <param name="dt1"Table表1</param
/// <param name="dt2"Table表2</param
/// <param name="DTName"合并后新的表名</param
/// <returns</returns
private DataTable UniteDataTable( DataTable dt1 ,DataTable dt2 ,string DTName){DataTable dt3 = dt1.Clone();
for( int i = 0 ;i < dt2.Columns.Count ;i ++ ){dt3.Columns.Add( dt2.Columns[i].ColumnName ) ;}object[] obj = new object[dt3.Columns.Count];
for (int i = 0; i < dt1.Rows.Count; i++){dt1.Rows[i].ItemArray.CopyTo(obj,0);
dt3.Rows.Add(obj);}
if( dt1.Rows.Count = dt2.Rows.Count ){for( int i = 0 ;i < dt2.Rows.Count ;i++ ){for( int j = 0 ;j < dt2.Columns.Count ;j ++ ){dt3.Rows[i][j+dt1.Columns.Count] = dt2.Rows[i][j].ToString() ;}}}else{DataRow dr3 ;本回答被提问者采纳