合并两个DataTable

方法1:

SqlConnection myConnection=new SqlConnection("server=localhost;uid=sa;pwd=;database=wjoa");

string sql1="select * from ResourseManage_T";

SqlDataAdapter adapterA=new SqlDataAdapter(sql1,myConnection);

DataSet ds=new DataSet();

adapterA.Fill(ds,"a");

string sql2="select * from UserLogin_t";

if(myConnection.State != ConnectionState.Closed)

myConnection.Close();

adapterA=new SqlDataAdapter(sql2, myConnection);

adapterA.Fill(ds,"b");

DataTable dtParent=ds.Tables["a"];

DataTable dtChild=ds.Tables["b"];

DataRow dr;

for(int i=0;i<dtChild.Rows.Count;i++)

this.DataGrid1.DataSource=ds.Tables["a"].DefaultView;

this.DataGrid1.DataBind();

方法2:

//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.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);

}

//两个结构不同的DT合并

/// <summary>

/// 将两个列不同的DataTable合并成一个新的DataTable

/// </summary>

/// <param name="dt1">表1</param>

/// <param name="dt2">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 ; //设置DT的名字

return dt3 ;

}