学步园

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();<br /> DataTable DataTable2 = new DataTable();<br /> DataTable newDataTable = DataTable1.Clone(); </p> <p>object[] obj = new object[newDataTable.Columns.Count];<br /> for (int i = 0; i < DataTable1.Rows.Count; i++)<br /> {<br /> DataTable1.Rows[i].ItemArray.CopyTo(obj,0);<br /> newDataTable.Rows.Add(obj);<br /> }<br /> for (int i = 0; i < DataTable2.Rows.Count; i++)<br /> {<br /> DataTable2.Rows[i].ItemArray.CopyTo(obj,0);<br /> newDataTable.Rows.Add(obj);<br /> }<br /> //或者<br /> DataTable DataTable1 = new DataTable();<br /> DataTable DataTable2 = new DataTable(); </p> <p>object[] obj = new object[DataTable1 .Columns.Count];<br /> for (int i = 0; i < DataTable2.Rows.Count; i++)<br /> {<br /> DataTable2.Rows[i].ItemArray.CopyTo(obj,0);<br /> DataTable1.Rows.Add(obj);<br /> }

两个结构不同的DataTable合并

/// <summary><br /> /// 将两个列不同的DataTable合并成一个新的DataTable<br /> /// </summary><br /> /// <param name="dt1">Table表1</param><br /> /// <param name="dt2">Table表2</param><br /> /// <param name="DTName">合并后新的表名</param><br /> /// <returns></returns></p> <p> private DataTable UniteDataTable( DataTable dt1 ,DataTable dt2 ,string DTName)<br /> {<br /> DataTable dt3 = dt1.Clone();<br /> for( int i = 0 ;i < dt2.Columns.Count ;i ++ )<br /> {<br /> dt3.Columns.Add( dt2.Columns[i].ColumnName ) ;<br /> }<br /> object[] obj = new object[dt3.Columns.Count]; </p> <p> for (int i = 0; i < dt1.Rows.Count; i++)<br /> {<br /> dt1.Rows[i].ItemArray.CopyTo(obj,0);<br /> dt3.Rows.Add(obj);<br /> } </p> <p> if( dt1.Rows.Count >= dt2.Rows.Count )<br /> {<br /> for( int i = 0 ;i < dt2.Rows.Count ;i++ )<br /> {<br /> for( int j = 0 ;j < dt2.Columns.Count ;j ++ )<br /> {<br /> dt3.Rows[i][j+dt1.Columns.Count] = dt2.Rows[i][j].ToString() ;<br /> }<br /> }<br /> }<br /> else<br /> {<br /> DataRow dr3 ;<br /> for( int i = 0 ;i < dt2.Rows.Count - dt1.Rows.Count ;i ++ )<br /> {<br /> dr3 = dt3.NewRow() ;<br /> dt3.Rows.Add( dr3 ) ;<br /> }<br /> for( int i = 0 ;i < dt2.Rows.Count ;i++ )<br /> {<br /> for( int j = 0 ;j < dt2.Columns.Count ;j ++ )<br /> {<br /> dt3.Rows[i][j+dt1.Columns.Count] = dt2.Rows[i][j].ToString() ;<br /> }<br /> }<br /> }<br /> dt3.TableName = DTName ;<br /> return dt3 ;<br /> }

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