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  • 合并DataTbale

    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 ;
    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 ;
    }
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  • 原文地址:https://www.cnblogs.com/fuhaidasheng/p/2070072.html
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