如何合并DataTable

两个结构一样的DataTable合并

NET 2.0 以上版本直接有 DataTable.Merge 方法： 

http://msdn.microsoft.com/zh-cn/library/fk68ew7b.aspx 

.NET Framework 类库 
DataTable.Merge 方法 


将指定的 DataTable 与当前的 DataTable 合并。 


命名空间： System.Data 
程序集： System.Data（在 System.Data.dll 中）
或者：
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);    
}  
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 

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/// <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 ;    
  for( int i = 0 ;i < dt2.Rows.Count - dt1.Rows.Count ;i ++ )    
  {    
   dr3 = dt3.NewRow() ;    
   dt3.Rows.Add( dr3 ) ;    
  }    
  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() ;    
   }    
  }    
 }    
 dt3.TableName = DTName ;    
 return dt3 ;    
}  

本文转自94cool博客园博客，原文链接：http://www.cnblogs.com/94cool/articles/1535518.html，如需转载请自行联系原作者